CN111829585A - Highway subgrade disease monitoring system and method based on OFDR - Google Patents
Highway subgrade disease monitoring system and method based on OFDR Download PDFInfo
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- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
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Abstract
The invention discloses an OFDR (offset OFDR) -based highway roadbed disease monitoring system and a method, wherein the system comprises a roadbed settlement optical fiber sensing device, a roadbed horizontal deformation optical fiber sensing device, a bridge foundation pile deformation optical fiber sensing device, a water level change and precipitation optical fiber sensing device, an OFDR optical fiber data acquisition and transmission system, an on-site road condition monitoring system, a solar power supply and data transmission system, an OFDR optical fiber data processing and analysis system, a wavelet processing and noise reduction system, a monitoring result display system, a cloud platform data management and early warning system and a remote receiving system; the OFDR optical fiber data are collected and transmitted in real time, roadbed settlement difference, horizontal displacement, foundation pile dynamic strain response, precipitation, underground water level and river water level information are obtained through the optical fiber data processing system and are displayed in the monitoring result display system in a diagram mode, the monitoring result display system uploads the monitoring result display system to the cloud platform data management and early warning system and then is compared with an early warning value, a disease processing scheme is searched in time, and remote monitoring and timely processing are achieved.
Description
Technical Field
The invention relates to a highway subgrade deformation disease monitoring system under dynamic load, in particular to a highway subgrade disease monitoring system and method based on OFDR.
Background
Roadbed deformation such as settlement and horizontal displacement of roadbed slopes is one of the most common diseases of the expressway with the on-line traffic, driving safety accidents are caused under severe conditions, and the annual maintenance and treatment cost is high.
Traditional road bed deformation monitoring system adopts to bury underground subsides sign, deviational survey pipe, axle power meter mode more, monitors to road bed subsides, horizontal displacement and embankment or bridge foundation pile deformation, has that work load is big, need personnel's cooperation, easily receives weather factor influence, the low shortcoming of monitoring precision, can not acquire the deformation characteristic of road bed comprehensively.
With the informatization and automation development of social production and life, how to conveniently and effectively monitor the deformation of an active expressway under the action of dynamic load for a long time, especially how to monitor the deformation of equipment and a roadbed together in a coordinated manner and accurately monitor the displacement change becomes a hotspot and a difficulty of the research of the engineering field.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an OFDR (offset OFDR) -based highway roadbed disease monitoring system and method, which are used for solving the technical problems that monitoring equipment in the prior art cannot cooperatively deform with a roadbed, and is difficult to accurately monitor roadbed disease parameters including roadbed settlement, horizontal deformation, displacement change of bridge foundation pile deformation and water level information and perform early warning.
The technical scheme is as follows: the invention relates to an OFDR-based highway subgrade disease monitoring system, which comprises a subgrade settlement optical fiber sensing device, a subgrade horizontal deformation optical fiber sensing device, a bridge foundation pile deformation optical fiber sensing device, a water level change and precipitation optical fiber sensing device, an OFDR optical fiber data acquisition and transmission system, an on-site road condition monitoring system, a solar power supply and data transmission system, an OFDR optical fiber data processing and analysis system, a wavelet processing and noise reduction system, a monitoring result display system, a cloud platform data management and early warning system and a remote receiving system;
the roadbed settlement optical fiber sensing device comprises a geogrid, and a strain optical fiber and a temperature compensation optical fiber which are arranged on the geogrid;
the roadbed horizontal deformation optical fiber sensing device comprises a soil body inclinometer pipe, and a strain optical fiber, a temperature compensation optical fiber and a self-heating optical fiber temperature sensor which are arranged in the inclinometer pipe;
the bridge foundation pile deformation optical fiber sensing device comprises a cast-in-place pile, and a strain optical fiber and a temperature compensation optical fiber which are arranged on the cast-in-place pile;
the water level change and precipitation optical fiber sensing device comprises a water level monitoring device and a precipitation monitoring device which are provided with self-heating optical fiber temperature sensors;
the solar power supply and data transmission system wirelessly transmits live monitoring of the on-site road condition monitoring system to the cloud platform data management and early warning system, and transmits data acquired by the OFDR optical fiber data acquisition and transmission system to the OFDR optical fiber data processing and analysis system; the OFDR optical fiber data processing and analyzing system analyzes and converts the optical fiber wavelength into strain and temperature information, and transmits the data after temperature compensation to a wavelet processing and noise reduction system for noise reduction; the monitoring result display system obtains information causing roadbed diseases and transmits the information to the cloud platform data management and early warning system in a chart form; the cloud platform data management and early warning system compares the data with a preset value for early warning, and transmits the optical fiber monitoring result and the road condition monitoring information to the corresponding remote receiving system.
The OFDR optical fiber data acquisition and transmission system comprises a dynamic data acquisition module, a data classification and packaging module and a remote parameter setting module.
The on-site road condition monitoring system comprises a camera module, a camera module and a speed measuring module.
The precipitation monitoring device comprises a rainwater collection module and a precipitation monitoring module.
The solar power supply and data transmission system comprises a solar power generation module, a voltage stabilization and transformation module and a wireless data transmission module.
The OFDR optical fiber data processing and analyzing system comprises a computer processing core module, a wireless data receiving module, a data export module and a power supply module; the computer processing core module comprises a temperature compensation processing module, a settlement data processing module, a horizontal displacement data processing module, a pile foundation vertical deformation processing module, a pile foundation horizontal deformation processing module and a pile foundation axial force processing module.
The cloud platform data management and early warning system comprises a data receiving module, a wireless data transmission module, a chart display module, an information base module, an early warning module and a power supply module; the information base module comprises a monitoring data storage and updating module, a road section responsible person information storage and calling module, a processing scheme storage and calling module, an information storage and calling module and a cooperation department information storage and calling module.
The mobile phone remote receiving system comprises a worker receiving system and an police receiving system, wherein the worker receiving system and the police receiving system respectively comprise a data receiving module, a chart display module, an early warning module and a power supply module;
the system comprises a work side receiving system, a diagram display module, an early warning module, a road condition information display module and a water level information display module, wherein the diagram display module of the work side receiving system displays road condition information, and the early warning module carries out early warning on deformation of a roadbed and rapid change of a water level; the method comprises the following steps that a diagram display module of a police receiving system displays vehicle illegal information, and an early warning module carries out early warning on water level rapid change, road surface collapse and landslide disasters;
the early warning module comprises an early warning value setting module, a monitoring data and early warning value comparison module and an alarm module.
The invention discloses an OFDR-based highway roadbed disease monitoring method, which adopts an OFDR-based highway roadbed disease monitoring system to monitor, and comprises the following steps:
(1) respectively bonding the strain optical fiber and the temperature compensation optical fiber on the surface of the geogrid and the inner pipe wall of the soil body inclinometer pipe, and fixing the strain optical fiber and the temperature compensation optical fiber on the side surface of a main reinforcement bar of a foundation pile reinforcement cage of the bridge, and straightening the strain optical fiber;
(2) protecting the self-heating optical fiber temperature sensor by using a hollow protective sleeve, and bonding and arranging the self-heating optical fiber temperature sensor on the inner wall of the inclinometer, the inner wall of the precipitation monitoring device and the surface of the river water level monitoring device;
(3) laying the geogrid provided with the strain optical fiber and the temperature compensation optical fiber in the leveled foundation soil layer;
(4) arranging soil body inclinometer pipes provided with strain optical fibers, temperature compensation optical fibers and self-heating optical fiber temperature sensors on two sides of a roadbed;
(5) placing the bridge foundation pile reinforcement cage provided with the strain optical fiber and the temperature compensation optical fiber into the drill hole and pouring concrete;
(6) fixing a precipitation monitoring device provided with a self-heating optical fiber temperature sensor beside a road;
(7) fixing a river water level monitoring device provided with a self-heating optical fiber temperature sensor on a central river bed;
(8) protecting the optical fiber lead wire with the reserved length by using a protective sleeve, leading the optical fiber lead wire to the OFDR optical fiber data automatic acquisition and transmission system, welding the optical fiber lead wire with a jumper wire, and connecting the optical fiber lead wire to the OFDR optical fiber data automatic acquisition and transmission system;
(9) connecting the solar power generation panel with a voltage stabilizing and transforming device, and connecting the solar power generation panel to a wireless data transmission module, an OFDR optical fiber data automatic acquisition and transmission system and a field road condition monitoring system for power supply after voltage stabilization and transformation;
(10) the OFDR optical fiber data acquisition and transmission system acquires optical fiber monitoring data, and the field road condition monitoring system acquires road condition and vehicle information; the wireless data transmission module wirelessly transmits the acquired optical fiber monitoring data to an OFDR optical fiber data processing and analyzing system, and wirelessly transmits road condition and vehicle information to a cloud platform data management and early warning system;
(11) connecting an OFDR optical fiber data processing and analyzing system with a power supply and a wavelet processing and noise reduction system, receiving data transmitted by an optical fiber signal transmitter, recording wavelength data of a sensing optical fiber, and performing temperature compensation processing and wavelet noise removal processing on data of a strain optical fiber by using data of a temperature compensation optical fiber;
(12) the monitoring result display system receives the results after wavelet processing and denoising processing by the denoising system, converts the results into a chart, records and transmits data to the cloud platform data management and early warning system;
(13) the cloud platform data management and early warning system receives data of the monitoring result display system, compares the data with a preset early warning value, receives real-time road conditions such as photos or videos transmitted by the field monitoring module, and transmits the monitoring results and the real-time road conditions to the mobile phone remote receiving system according to the contact modes of the responsible persons of the road sections recorded in the database;
(14) and the mobile phone remote receiving system receives the result remotely transmitted by the cloud platform data management and early warning system and displays the result on a screen in a chart form.
In the step (1), the bottom of the soil body inclinometer pipe is provided with a honeycomb-shaped small hole to monitor the change of the underground water level.
In the step (2), the hollow protective sleeve is a rigid protective sleeve; in the step (8), the hollow protective sleeve is a rigid protective sleeve or a flexible protective sleeve.
And (4) when the soil body inclinometer pipe is laid, one side provided with the strain optical fiber and the temperature compensation optical fiber faces to the road center.
And (6) when the precipitation monitoring device is arranged, the bottom of the water collecting device is parallel to the road surface.
In the step (6) and the step (7), the arranged precipitation monitoring device and the river water level monitoring device are both in the shooting range of the on-site road condition monitoring system (8), so that the running condition can be conveniently checked and compared with the monitoring data.
In the step (13), if the road condition monitoring result reaches the early warning value, calling corresponding road section responsible person information, processing scheme and related construction unit information in the information base module, and sending the monitoring result, the processing scheme and a road section live picture shot by the on-site road condition monitoring system to a mobile phone remote receiving system of a road section responsible person; if the on-site road condition monitoring system monitors illegal information of the overspeed vehicle, the corresponding traffic police cooperation department in the information base module is called, and the illegal information of the vehicle is sent to the traffic police cooperation department.
The working principle is as follows: the OFDR (optical Frequency Domain reflection) optical fiber sensing technology has the characteristics of high precision and interference resistance, and is widely applied to the fields of civil engineering, water conservancy and traffic, geological engineering and aerospace engineering.
The invention is used for monitoring the foundation of the pile under the pier and the foundation of the pile under the embankment on the roadbed pile of the highway, in particular to the optical frequency domain reflection OFDR technology which combines transmission and sensing media into a whole is applied to roadbed deformation monitoring, so that the optical frequency domain reflection OFDR technology and the roadbed deformation monitoring can cooperatively deform together with the roadbed and accurately monitor the parameters of roadbed diseases caused by roadbed settlement, horizontal deformation, bridge foundation pile deformation and other displacement changes and water level information. The technology is based on a frequency modulation continuous wave technology of a pulse radar, two beams of coherent light are incident into an optical fiber, then the detection light and the intrinsic light interfere at a receiving end, if the phase of an optical signal is changed or modulated due to the change of test environment parameters, the detection signal of the signal detection end is changed, and the interference light is demodulated to obtain the specific information of the optical fiber to be detected. The strain resolution reaches 1.0 mu, the temperature resolution reaches 0.12 ℃, and the measurement range reaches +/-30000 mu and minus 270-900 ℃. In the monitoring system, optical fiber sensors are arranged on geogrids, soil body inclinometer pipes and foundation pile reinforcement cage main reinforcements, the geogrids are arranged in a roadbed surface layer, a base layer and a foundation soil layer according to the standard requirement, and the soil body inclinometer pipes are symmetrically arranged on two sides of a roadbed; the dynamic load of the automobile causes the settlement and horizontal deformation of the roadbed, correspondingly drives the deformation of the geogrid, the inclinometer pipe and the foundation pile, and further drives the deformation of the optical fiber sensor, so that the monitoring of the deformation of the roadbed is realized; the heating wire in the self-heating optical fiber temperature sensor generates heat under the action of constant current at rated power, the temperature of the optical fiber changes, and the rate of the temperature change of the optical fiber in the air is far greater than that of the water in a certain period of time, so that the rate of the temperature change of the optical fiber at different depths after the optical fiber is heated by the self-heating optical fiber temperature sensor can be used for judging the water level, and the water level can be monitored; the on-site road condition monitoring system carries out real-time road condition monitoring and vehicle information monitoring; meanwhile, the automatic acquisition device and the remote data transmission technology are utilized to realize dynamic monitoring and remote monitoring of road surface deformation, and the cloud data management system is utilized to realize timely feedback and treatment of road base diseases.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) the OFDR is combined with an automatic acquisition system and a remote data transmission technology, and the OFDR and a roadbed cooperatively deform and accurately monitor displacement change and water level change, so that dynamic automatic remote monitoring and early warning are realized;
(2) the invention realizes the automatic collection and processing of data and the display of the data in a chart form at the mobile terminal of the mobile phone, and the early warning of deformation diseases and the timely search of disease processing schemes, thereby achieving the purposes of remote monitoring and timely processing.
(3) The on-site road condition monitoring system and the traffic police department cooperate to record the illegal information of the vehicles, thereby preventing road damage caused by traffic accidents.
(4) The invention has the advantages of high survival rate, comprehensive acquired data, small human error, electromagnetic interference resistance and high sensitivity, and realizes the remote monitoring, early warning and timely disease treatment of the deformation of the highway subgrade under the action of dynamic load.
Drawings
FIG. 1 is a schematic view of a monitoring system according to the present invention;
FIG. 2 is a cross-sectional view of the geogrid and inclinometer of the roadbed longitudinal section;
FIG. 3 is a top view of the geogrid layout of the present invention;
FIG. 4 is a schematic diagram of the fiber arrangement of the bridge foundation pile in the longitudinal section of the invention;
FIG. 5 is a schematic diagram of the arrangement of optical fibers on the cross section of the bridge foundation pile according to the present invention;
FIG. 6 is a schematic view of the optical fiber layout of the river water level monitoring device of the present invention;
FIG. 7 is a schematic view of the arrangement of optical fibers of the precipitation monitoring device of the present invention.
Detailed Description
As shown in fig. 1, the highway subgrade disease monitoring system of the invention comprises a subgrade settlement optical fiber sensing device, a subgrade horizontal deformation optical fiber sensing device, a bridge foundation pile deformation optical fiber sensing device, a water level change and precipitation optical fiber sensing device, an OFDR optical fiber data acquisition and transmission system 7, an on-site road condition monitoring system 8, a solar power supply and data transmission system 11, an OFDR optical fiber data processing and analysis system 12, a wavelet processing and noise reduction system 13, a monitoring result display system 14, a cloud platform data management and early warning system 15 and a remote receiving system 16.
The roadbed settlement optical fiber sensing device comprises a geogrid 2, and a strain optical fiber 1a and a temperature compensation optical fiber 1b which are arranged on the geogrid.
The roadbed horizontal deformation optical fiber sensing device comprises a soil body inclination measuring pipe 4, a strain optical fiber 1a, a temperature compensation optical fiber 1b and a self-heating optical fiber temperature sensor 1d, wherein the strain optical fiber 1a, the temperature compensation optical fiber 1b and the self-heating optical fiber temperature sensor are arranged in the inclination measuring pipe.
The bridge foundation pile deformation optical fiber sensing device comprises a cast-in-place pile, and a strain optical fiber 1a and a temperature compensation optical fiber 1b which are arranged on the cast-in-place pile.
The water level change and precipitation optical fiber sensing device comprises a water level monitoring device 10 and a precipitation monitoring device 9 which are provided with self-heating optical fiber temperature sensors 1 d.
The OFDR optical fiber data automatic acquisition and transmission system 7 comprises a dynamic data acquisition module, a data classification and packaging module and a remote parameter setting module; the on-site road condition monitoring system 8 comprises a camera module, a camera module and a speed measuring module; the precipitation monitoring device 9 comprises a rainwater collection module and a precipitation monitoring module; the solar power supply and data transmission system 11 comprises a solar power generation module 11a, a voltage stabilization and transformation module 11b and a wireless data transmission module 11c, wherein a solar power generation panel is connected with a voltage stabilization and transformation device and continuously supplies power for the wireless data transmission module, the OFDR optical fiber data automatic acquisition and transmission system and the on-site road condition monitoring system for a long time after voltage stabilization and transformation.
The method comprises the following steps that an OFDR optical fiber data automatic acquisition and transmission system jumper is connected with a strain optical fiber and a temperature compensation optical fiber, relevant parameters are set remotely, and after original data are acquired, data are packaged according to the settlement, horizontal displacement and pile foundation deformation parameters of a monitoring system to which the data belong and are transmitted to an OFDR optical fiber data processing and analysis system in a wireless mode; the OFDR optical fiber data processing and analyzing system receives data sent by the OFDR optical fiber data automatic acquisition and transmission system, analyzes the wavelength of the distributed optical fiber and converts the wavelength into strain information and temperature information, performs temperature compensation on optical fiber monitoring data corresponding to the temperature compensation optical fiber monitoring data, and then transmits the signal to the wavelet processing and noise reduction system; the wavelet processing and denoising system receives data sent by the OFDR optical fiber data processing and analyzing system, performs wavelet processing to achieve the purpose of denoising, and transmits the data to the monitoring result display system; the monitoring result display system obtains information of roadbed diseases caused by settlement, horizontal displacement, underground water level and precipitation of the roadbed through processing, displays the information in a chart and transmits the information to the cloud platform data management and early warning system; the cloud platform data management and early warning system compares data with a preset value to realize early warning, and transmits information to the worker remote receiving system and the police remote receiving system according to different alarm types: when the road condition is in problem, the monitoring result, whether the processing is needed and the processing scheme information are wirelessly transmitted to a mobile phone remote receiving system; the mobile phone remote receiving system receives the results sent by the monitoring result display system, displays the results in a chart form, alarms in a sound and image form when the early warning standard is reached, and displays the processing scheme and the information of the contact way of the construction unit related to the scheme so as to monitor the deformation condition of the roadbed of the active expressway and process the deformation condition in time; when the on-site road condition monitoring system monitors illegal information of the overspeed vehicle or road surface collapse and landslide disasters, the corresponding traffic police cooperation department in the information base module is called, and the illegal information of the vehicle is sent to the traffic police cooperation department.
The OFDR optical fiber data processing and analyzing system 12 comprises a computer processing core module, a wireless data receiving module, a data exporting module and a power supply module; the computer processing core module comprises a temperature compensation processing module, a settlement data processing module, a horizontal displacement data processing module, a pile foundation vertical deformation processing module, a pile foundation horizontal deformation processing module and a pile foundation axial force processing module. The wavelet processing and denoising system 13 includes a computer processing module, a data receiving module, and a power supply module, wherein the computer processing module includes a wavelet processing module, a denoising module, an image generating module, and a power supply module. The monitoring result display system 14 comprises a data receiving module, a data chart processing module, a wireless data transmission module and a power supply module. The cloud platform data management and early warning system 15 comprises a data receiving module, a wireless data transmission module, a chart display module, an information base module, an early warning module and a power supply module; the information base module comprises a monitoring data storage and updating module, a road section principal information storage and calling module, a processing scheme storage and calling module, a related construction unit information storage and calling module and a cooperative traffic police department information storage and calling module. The mobile phone remote receiving system 16 comprises a worker receiving system and an police receiving system, and both comprise a data receiving module, a chart display module, an early warning module and a power supply module. The system comprises a work side receiving system, a diagram display module, an early warning module, a road condition information display module and a water level information display module, wherein the diagram display module of the work side receiving system displays road condition information, and the early warning module carries out early warning on deformation of a roadbed and rapid change of a water level; the chart display module of the police receiving system displays vehicle illegal information, and the early warning module carries out early warning on water level rapid change, road surface collapse and landslide disasters. The early warning module comprises an early warning value setting module, a monitoring data and early warning value comparison module and an alarm module.
As shown in fig. 2, 3, 4, 5, 6 and 7, a plurality of U-shaped grooves are symmetrically formed in the side wall of the soil body inclinometer pipe, a plurality of honeycomb-shaped holes are formed in the bottom of the inclinometer pipe to monitor the change of the ground water level, the strain optical fibers 1a and the temperature compensation optical fibers 1b are arranged on the geogrid 2 along the geogrid grid, the strain optical fibers and the temperature compensation optical fibers are arranged on the soil body inclinometer pipe 4 along the grooves in the inner wall of the inclinometer pipe, and the strain optical fibers and the temperature compensation optical fibers are arranged on the side faces of the main ribs along the main ribs of the reinforcement cage 6; the self-heating optical fiber temperature sensor 1d is arranged on the surfaces of the soil body inclinometer pipe 4, the inner wall of the precipitation monitoring device 9 and the river water level monitoring device 10 along the groove of the inner wall of the inclinometer pipe.
The strain optical fiber, the temperature compensation optical fiber and the self-heating optical fiber temperature sensor are connected with an OFDR optical fiber data automatic acquisition and transmission system 7 through an optical fiber lead 1 c; the OFDR optical fiber data automatic acquisition and transmission system 7 and the on-site road condition monitoring system 8 are powered by a solar power supply and data transmission system 11; the solar power supply and data transmission system 11 wirelessly transmits the live monitoring of the on-site road condition monitoring system 8 to the cloud platform data management and early warning system 15; the OFDR optical fiber data automatic acquisition and transmission system 7 automatically acquires monitoring data and transmits the monitoring data to the solar power supply and data transmission system 11 in a classified and packaged manner according to different test objects such as settlement, horizontal displacement and pile foundation, and the solar power supply and data transmission system 11 wirelessly transmits the data acquired by the OFDR optical fiber data automatic acquisition and transmission system 7 to the OFDR optical fiber data processing and analysis system 12; the OFDR optical fiber data processing and analyzing system 12 receives data sent by the solar power supply and data transmission system 11; the output end of the OFDR optical fiber data processing and analyzing system 12 is connected with a wavelet processing and noise reduction system 13; the wavelet processing and denoising system 13 is connected with a monitoring result display system 14; the monitoring result display system 14 remotely transmits the processed result to the cloud platform data management and early warning system; the cloud platform data management and early warning system 15 remotely transmits the optical fiber monitoring result and road condition live monitoring to the corresponding mobile phone remote receiving system 16; the mobile phone remote receiving system 16 displays the monitoring result and the processing scheme information in a form of a graph.
Wherein the strain optical fiber 1a, the temperature compensation optical fiber 1b and the self-heating optical fiber temperature sensor 1d are all PE optical fibers, lc is an optical fiber exposed above the road surface, and a protective sleeve 17 is required to be added for protection; the geogrid 2 is arranged in a surface layer 3a, a base layer 3b and a soil layer 3c of a roadbed to realize omnibearing monitoring and early warning, soil body inclinometer pipes 4 are symmetrically arranged on two sides of the roadbed to monitor horizontal displacement of the roadbed, a reinforcement cage 6 is poured into foundation piles 5 through concrete, a precipitation monitoring device 9 is horizontally fixed beside a road, and a river water level monitoring device 10 is fixed on a central river bed; the solar power generation panel 11a is connected with the voltage stabilizing and transforming device 11b, and is connected to the wireless data transmission module 11c, the OFDR optical fiber data automatic acquisition and transmission system 7 and the on-site road condition monitoring system 8 for long-term stable power supply after voltage stabilization and transformation.
The OFDR optical fiber data automatic acquisition and transmission system 7 adopts an optical fiber dynamic data acquisition instrument based on an OFDR technology, and is provided with an automatic data acquisition function, a remote parameter setting function and a data classification and packaging function; the OFDR optical fiber data automatic acquisition and transmission system 7 acquires optical fiber monitoring data, and the field road condition monitoring system 8 acquires road condition and vehicle information; the wireless data transmission module 11c wirelessly transmits the acquired optical fiber monitoring data to the OFDR optical fiber data processing and analyzing system 12, and wirelessly transmits road condition and vehicle information to the cloud platform data management and early warning system 15; the OFDR optical fiber data processing and analyzing system 12 automatically judges the position of the monitored object according to the characteristics of the optical fiber data, extracts related data, converts the data into strain information and temperature information, performs temperature compensation on the strain, performs different processing according to the difference of the monitored object, and converts the data into required data; a wavelet processing and denoising system 13 for smoothing and denoising the data; the monitoring result display system 14 is used for displaying the processed optical fiber data in a visual form of a chart; the cloud platform data management and early warning system 15 compares the monitoring data with an early warning value and sends the monitoring data to a mobile phone remote receiving system 16 of a road segment responsible person or a cooperative traffic police department; the mobile phone remote receiving system 16 displays the data recorded by the monitoring result display system 14 on the mobile phone in a form of a chart, so as to achieve the monitoring effect.
The monitoring method of the highway subgrade disease monitoring system based on OFDR comprises the following steps:
(1) arranging a strain optical fiber 1a and a temperature compensation optical fiber 1b on the front surface of the grid of the geogrid 2; and binding the grid by using a binding tape, straightening the strain optical fiber 1a during binding, and applying no acting force on the temperature compensation optical fiber 1 b. Arranging a strain optical fiber 1a and a temperature compensation optical fiber 1b in a groove on the inner wall of the inclinometer 4; the optical fiber is fixed on the inner wall of the inclinometer tube 4 by using an epoxy resin adhesive, and the strain optical fiber 1a is stretched straight during fixing, so that no acting force is applied to the temperature compensation optical fiber 1 b. The strain optical fiber 1a and the temperature compensation optical fiber 1b are respectively arranged on the side surfaces of two main bars of a reinforcement cage 6 in a cast-in-place pile 5 in a U-shaped manner, adjacently and symmetrically, so that the damage of grouting to the sensing optical fiber is reduced; and binding the stirrup of the reinforcement cage by using a binding tape, straightening the strain sensing optical fiber 1a during binding, and applying no acting force on the temperature compensation optical fiber 1 b.
(2) Fixing the self-heating optical fiber temperature sensor 1d into the rigid protective sleeve 17 to prevent the damage caused by external factors, and then fixedly bonding the self-heating optical fiber temperature sensor on the inner wall groove of the inclinometer 4, the inner wall of the precipitation monitoring device 9 and the surface of the river water level monitoring device 10 by using epoxy resin, and keeping the self-heating optical fiber temperature sensor vertical to the horizontal ground during fixing; a honeycomb-shaped hole is punched at the lower part of the inclinometer pipe, so that underground water can enter the hole conveniently and the self-heating optical fiber temperature sensor 1d can be monitored conveniently, and the optical fiber arrangement position is avoided during punching, so that the strength of the inclinometer pipe is prevented from being damaged, and the inclinometer pipe is convenient to use for a long time.
(3) Leveling a foundation soil layer, and laying the geogrid 2 provided with the strain optical fibers 1a and the temperature compensation optical fibers 1b on a leveled field to enable the geogrid 2 to be tightly attached to the field, so that the geogrid and a soil body are ensured to be deformed in a coordinated manner; and after paving, filling, leveling and rolling are carried out in time. And selecting the layout point positions of the inclinometer pipes on two sides of the roadbed, symmetrically arranging the inclinometer pipes with a gap, vertically driving the inclinometer pipes 4 into the roadbed, wherein one side provided with the optical fiber sensor faces the road. And (5) putting the reinforcement cage 6 into the drill hole, pouring concrete after protecting the optical fiber sensor, and curing to form the cast-in-place pile 5. The rainfall monitoring device 9 is horizontally fixed beside a road, the river water level monitoring device 10 is fixed on a central river bed, and the two devices are both arranged in the camera shooting range of the on-site road condition monitoring system 8 so as to be convenient for comparison and inspection with on-site images and monitoring data. The three optical fibers are respectively reserved with set lengths so as to be connected with the optical fiber data automatic acquisition device 7 in the later period. In the construction process, the reserved optical fiber is protected by a protective sleeve, and the optical fiber is prevented from being damaged in the soil filling, leveling and grouting processes.
(4) Connecting an OFDR optical fiber data automatic acquisition and transmission system 7 and a field road condition monitoring system 8 with a solar power supply and data transmission system 11, and testing the timeliness and effectiveness of monitoring by the field road condition monitoring system 8; after roadbed filling and pile foundation maintenance are finished, the strain optical fiber 1a, the temperature compensation optical fiber 1b and the self-heating optical fiber temperature sensor 1d extending out of the roadbed are respectively welded with a jumper wire, a thermal expansion pipe is added at the optical fiber welding position to increase rigidity and durability, the optical fiber is connected into different channels of an OFDR optical fiber data automatic acquisition and transmission system 7 according to the settlement of a monitoring system, horizontal displacement, pile foundation deformation and water level distribution after welding, the connectivity of a circuit is tested, relevant parameters are set, and data are subjected to trial acquisition to determine the validity of the data.
(5) The field road condition monitoring system 8 transmits monitored real-time road conditions and vehicle information to the solar power supply and data transmission system 11, the solar power supply and data transmission system 11 wirelessly transmits the real-time road conditions and the vehicle information to the cloud platform data management and early warning system 15, and the cloud platform data management and early warning system 15 judges and early warns existing landslide road conditions and vehicle illegal information;
(6) the OFDR optical fiber data automatic acquisition instrument acquires data, packages the data according to categories and transmits the data to the solar power supply and data transmission system 11, the solar power supply and data transmission system 11 sends the data to the OFDR optical fiber data processing and analyzing system 12, the system automatically extracts the optical fiber data and transmits the optical fiber data to the wavelet processing and noise reduction system 13, the wavelet processing and noise reduction system 13 smoothes and removes noise of the data and displays the data in the monitoring result display system 14, and after strain data are obtained, the strain data are converted into soil body settlement difference, roadbed horizontal displacement and water level related information according to a formula.
(7) The monitoring result display system transmits data to the cloud platform data management and early warning system 15, the cloud platform data management and early warning system 15 compares with a preset early warning value, and transmits monitoring results, real-time road conditions and vehicle information to a mobile phone remote receiving system 16 different from workers, police and disaster emergency treatment departments according to the contact way of the responsible person of the road section or a cooperative traffic police department recorded in a database;
(8) the mobile phone remote receiving system 16 receives the result remotely transmitted by the cloud platform data management and early warning system 15, and displays the result on a screen in a graph form.
Claims (10)
1. The utility model provides a highway subgrade disease monitoring system based on OFDR which characterized in that: the system comprises a roadbed settlement optical fiber sensing device, a roadbed horizontal deformation optical fiber sensing device, a bridge foundation pile deformation optical fiber sensing device, a water level change and precipitation optical fiber sensing device, an OFDR optical fiber data acquisition and transmission system (7), an on-site road condition monitoring system (8), a solar power supply and data transmission system (11), an OFDR optical fiber data processing and analysis system (12), a wavelet processing and noise reduction system (13), a monitoring result display system (14), a cloud platform data management and early warning system (15) and a remote receiving system (16);
the roadbed settlement optical fiber sensing device comprises a geogrid (2), and a strain optical fiber and a temperature compensation optical fiber which are arranged on the geogrid;
the roadbed horizontal deformation optical fiber sensing device comprises a soil body inclinometer pipe (4), and a strain optical fiber, a temperature compensation optical fiber and a self-heating optical fiber temperature sensor which are arranged in the inclinometer pipe;
the bridge foundation pile deformation optical fiber sensing device comprises a cast-in-place pile, and a strain optical fiber and a temperature compensation optical fiber which are arranged on the cast-in-place pile;
the water level change and precipitation optical fiber sensing device comprises a water level monitoring device (10) and a precipitation monitoring device (9), wherein the water level monitoring device is provided with a self-heating optical fiber temperature sensor;
the solar power supply and data transmission system transmits live monitoring of the on-site road condition monitoring system to the cloud platform data management and early warning system, and transmits data acquired by the OFDR optical fiber data acquisition and transmission system to the OFDR optical fiber data processing and analysis system; the OFDR optical fiber data processing and analyzing system analyzes and converts optical fiber wavelength into strain and temperature information, transmits the data after temperature compensation to a wavelet processing and noise reduction system for noise reduction, the monitoring result display system obtains information causing roadbed damage and transmits the information to the cloud platform data management and early warning system in a chart form, the cloud platform data management and early warning system compares the data with a preset value for early warning, and transmits the optical fiber monitoring result and road condition monitoring information to a corresponding remote receiving system (16).
2. The OFDR-based highway subgrade disease monitoring system according to claim 1, wherein: the OFDR optical fiber data acquisition and transmission system comprises a dynamic data acquisition module, a data classification and packaging module and a remote parameter setting module.
3. The OFDR-based highway subgrade disease monitoring system according to claim 1, wherein: the on-site road condition monitoring system comprises a camera module, a camera module and a speed measuring module.
4. The OFDR-based highway subgrade disease monitoring system according to claim 1, wherein: the precipitation monitoring device comprises a rainwater collection module and a precipitation monitoring module.
5. The OFDR-based highway subgrade disease monitoring system according to claim 1, wherein: the solar power supply and data transmission system comprises a solar power generation module (11a), a voltage stabilization and transformation module (11b) and a wireless data transmission module (11 c).
6. The OFDR-based highway subgrade disease monitoring system according to claim 1, wherein: the OFDR optical fiber data processing and analyzing system comprises a computer processing core module, a wireless data receiving module, a data export module and a power supply module; the computer processing core module comprises a temperature compensation processing module, a settlement data processing module, a horizontal displacement data processing module, a pile foundation vertical deformation processing module, a pile foundation horizontal deformation processing module and a pile foundation axial force processing module.
7. The OFDR-based highway subgrade disease monitoring system according to claim 1, wherein: the cloud platform data management and early warning system comprises a data receiving module, a wireless data transmission module, a chart display module, an information base module, an early warning module and a power supply module; the information base module comprises a monitoring data storage and updating module, a road section responsible person information storage and calling module, a processing scheme storage and calling module, an information storage and calling module and a cooperation department information storage and calling module.
8. The OFDR-based highway subgrade disease monitoring system according to claim 1, wherein: the mobile phone remote receiving system comprises a worker receiving system and an police receiving system, wherein the worker receiving system and the police receiving system respectively comprise a data receiving module, a chart display module, an early warning module and a power supply module;
the system comprises a work side receiving system, a diagram display module, an early warning module, a road condition information display module and a water level information display module, wherein the diagram display module of the work side receiving system displays road condition information, and the early warning module carries out early warning on deformation of a roadbed and rapid change of a water level; the method comprises the following steps that a diagram display module of a police receiving system displays vehicle illegal information, and an early warning module carries out early warning on water level rapid change, road surface collapse and landslide disasters;
the early warning module comprises an early warning value setting module, a monitoring data and early warning value comparison module and an alarm module.
9. An OFDR-based highway subgrade disease monitoring method is characterized by comprising the following steps: monitoring is carried out by using the OFDR-based highway subgrade disease monitoring system according to any one of claims 1 to 8, the method comprising the following steps:
(1) respectively bonding the strain optical fiber (1a) and the temperature compensation optical fiber (1b) on the geogrid (2) and in the soil body inclinometer pipe (4), and fixing the strain optical fiber and the temperature compensation optical fiber on the main reinforcement (6) of the foundation pile reinforcement cage of the bridge;
(2) the self-heating optical fiber temperature sensor (1d) is protected by a hollow protective sleeve (17) and is arranged on the inner wall of the inclinometer pipe (4), the inner wall of the precipitation monitoring device (9) and the river water level monitoring device (10);
(3) laying the geogrid (2) provided with the strain optical fiber (1a) and the temperature compensation optical fiber (1b) in a foundation soil layer;
(4) arranging soil body inclinometer pipes (4) provided with strain optical fibers (1a), temperature compensation optical fibers (1b) and self-heating optical fiber temperature sensors (1d) on two sides of a roadbed;
(5) putting the bridge foundation pile reinforcement cage provided with the strain optical fiber (1a) and the temperature compensation optical fiber (1b) into the drilled hole and pouring concrete;
(6) fixing a precipitation monitoring device (9) provided with a self-heating optical fiber temperature sensor (1d) beside a road;
(7) fixing a river water level monitoring device (10) provided with a self-heating optical fiber temperature sensor (1d) on a river bed;
(8) the optical fiber lead (1c) with the reserved length is accessed to an OFDR optical fiber data automatic acquisition and transmission system (7);
(9) after the solar power generation panel (11a) is connected with the voltage stabilizing and transforming device (11b), the solar power generation panel is connected with the wireless data transmission module (11c), the OFDR optical fiber data acquisition and transmission system (7) and the on-site road condition monitoring system (8) for power supply;
(10) an OFDR optical fiber data acquisition and transmission system (7) acquires optical fiber monitoring data, and a field road condition monitoring system (8) acquires road condition and vehicle information; the wireless data transmission module (11c) wirelessly transmits the acquired optical fiber monitoring data to the OFDR optical fiber data processing and analyzing system (12), and transmits road condition and vehicle information to the cloud platform data management and early warning system (15);
(11) the OFDR optical fiber data processing and analyzing system (12) is connected with the wavelet processing and noise reduction system (13), receives data transmitted by an optical fiber signal transmitter, records wavelength data of the sensing optical fiber, and performs temperature compensation processing and wavelet noise reduction processing on data of the strain optical fiber (1a) by using data of the temperature compensation optical fiber (1 b);
(12) the monitoring result display system (14) receives the results of the wavelet processing and denoising processing of the denoising system (13), converts the results into a chart, records and transmits data to the cloud platform data management and early warning system (15);
(13) the cloud platform data management and early warning system (15) receives the data of the monitoring result display system (14), compares the data with an early warning value, simultaneously receives the real-time road condition transmitted by the field monitoring module (7d), and transmits the monitoring result and the real-time road condition to the remote receiving system (16);
(14) and the remote receiving system (16) receives the result remotely transmitted by the cloud platform data management and early warning system (15) and displays the result in a chart form.
10. The OFDR-based highway subgrade disease monitoring method according to claim 9, wherein: in the step (13), if the road condition monitoring result reaches an early warning value, the monitoring result, the processing scheme and the road section live picture are sent to a remote receiving system (16); if the on-site road condition monitoring system (8) monitors illegal information of the overspeed vehicle, the illegal information of the vehicle is sent to a traffic police cooperative department.
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| CN113932944A (en) * | 2021-10-12 | 2022-01-14 | 深圳大学 | System and method for monitoring displacement, strain and temperature in soil |
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