CN112414459A - Measurement system for intelligence acquisition road surface basic unit developments mechanics response - Google Patents
Measurement system for intelligence acquisition road surface basic unit developments mechanics response Download PDFInfo
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- CN112414459A CN112414459A CN202011255139.2A CN202011255139A CN112414459A CN 112414459 A CN112414459 A CN 112414459A CN 202011255139 A CN202011255139 A CN 202011255139A CN 112414459 A CN112414459 A CN 112414459A
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a road dynamic mechanics information acquisition system, and discloses a measurement system for intelligently acquiring dynamic mechanics response of a pavement base, which comprises a sensor group (1), a power supply and a data collector, wherein the sensor group (1) is arranged at the bottom of the pavement base, and sensors in the sensor group (1) are arranged at set intervals and are electrically connected with the power supply and the data collector to transmit measured data; the sensor group (1) comprises a concrete strain gauge (11), a soil pressure gauge (12) and a multipoint displacement meter (13). The arrangement mode of the sensors can avoid mutual interference, and the arrangement cost of the sensor group can be reduced.
Description
Technical Field
The invention relates to a road dynamic mechanical information acquisition system, in particular to a measuring system for intelligently acquiring dynamic mechanical response of a pavement base.
Background
The load applied by the vehicle to the pavement base layer has a close relationship with the deformation quantity generated by the pavement base layer, and in order to explore the relationship between the load applied to the pavement base layer and the deformation quantity of the pavement base layer, the stress applied to the pavement base layer under the dynamic load of the vehicle and the change process of the deformation quantity in the stress process need to be digitally analyzed.
In order to perform digital analysis of the force applied to the road base layer by the dynamic load of the vehicle and the deformation process in the force application process, it is necessary to measure the force application process and the deformation process of the road base layer by using a sensor, and record the measurement data for further analysis.
In the prior art, in the detection of the dynamic mechanical response of the road base layer, in order to obtain a sufficient amount of mechanical response data in different areas, a plurality of sensors are usually arranged, so that the cost of arranging the detection device is extremely high, and when the arrangement density of the sensors is high, interference is easily caused between the sensors for detection due to too close distance, and the measurement result is inaccurate.
In view of the above, it is desirable to provide a measurement system for intelligently acquiring dynamic mechanical response of a pavement base.
Disclosure of Invention
The invention aims to provide a measuring system for intelligently acquiring dynamic mechanical response of a pavement base, which can ensure the accuracy of measured data and has low arrangement cost.
In order to achieve the above object, the present invention provides a measurement system for intelligently acquiring dynamic mechanical response of a pavement base, comprising a sensor group, a power supply and a data collector, wherein the sensor group is arranged at the bottom of the pavement base, and each sensor in the sensor group is arranged at a set interval and is electrically connected with the power supply and the data collector to transmit measured data; the sensor group comprises a concrete strain gauge, an earth pressure gauge and a multipoint displacement meter.
Specifically, the concrete strain gauge and the soil pressure gauge are arranged at the vehicle wheel track of the traffic lane, and the multipoint displacement gauge is arranged at the hard road shoulder.
Preferably, the concrete strain gauge and the soil pressure gauge are both electrically connected to the multipoint displacement meter and are electrically connectable to the power source and the data collector via the multipoint displacement meter.
Specifically, the number of the concrete strain gauges is 8, and any two concrete strain gauges are matched to form 4 concrete strain gauge measuring units; the 4 concrete strain gauge measuring units can enclose a quadrilateral area; the number of the soil pressure gauges is 1, and the soil pressure gauges are located outside the quadrilateral area.
Preferably, two concrete strain gauges in each concrete strain gauge measuring unit are arranged perpendicular to each other, so that one of the concrete strain gauges can measure the bottom tensile strain of the base course in the driving direction, and the other concrete strain gauge can measure the bottom tensile strain of the base course in the width direction of the driving lane.
Preferably, the quadrilateral area is a square area, and the set distance d1 between two adjacent concrete strain gauge measuring units is more than or equal to 60 cm.
Further, the soil pressure gauge is arranged in the quadrilateral area in the front or the rear of the traveling direction.
Preferably, the set distance d2 between the soil pressure gauge and the quadrilateral area along the traffic direction is more than or equal to 60 cm.
Further preferably, the multipoint displacement meter is arranged in the measuring area formed by the concrete strain gauge and the soil pressure gauge in the front or the rear of the driving direction of the traffic lane.
More preferably, the set distance d3 between the multipoint displacement meter and the measuring area along the traffic direction is more than or equal to 80 cm.
The invention realizes the data measurement and recording of the vertical pressure of the pavement base under the action of the tensile strain and dynamic load of the pavement base layer through the sensor group arranged at the bottom of the pavement base layer, and the concrete strain gauge and the soil pressure gauge are arranged at the wheel track of the vehicle on the traffic lane so as to conveniently obtain more measurement data groups; since the multipoint displacement meter is arranged along the vertical direction, the multipoint displacement meter can not be damaged by rolling of vehicles when being arranged at a hard road shoulder; the spacing distance between the sensors is maintained in the set range, so that the influence of any one of the two adjacent sensors on the mechanical structure of the pavement base layer can not cause interference on the measurement result of the other sensor, and the accuracy of the measurement data can be ensured; the sensor arrangement mode of the invention can realize the measurement of required data by fewer sensors, thereby reducing the arrangement cost of the measurement system.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a schematic illustration of the placement of various sensors in one embodiment of the present invention.
Description of the reference numerals
1-sensor group 11-concrete strain gauge
12-earth pressure gauge 13-multipoint displacement meter
2-carriageway 3-hard road shoulder
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
First, it is to be noted that W in the drawing indicates a driving direction, and the driving direction indicates a driving direction in which a vehicle travels on the traffic lane 2 according to traffic regulations.
In an example of the present invention, as shown in fig. 1, the measurement system for intelligently acquiring dynamic mechanical response of a pavement base includes a sensor group 1, a power supply and a data collector, the sensor group 1 is disposed at the bottom of the pavement base, and each sensor in the sensor group 1 is disposed at a set interval and electrically connected to the power supply and the data collector to transmit measured data; the sensor group 1 includes a concrete strain gauge 11, an earth pressure gauge 12, and a multipoint displacement gauge 13.
The invention realizes the measurement and the recording of the bottom tensile strain of the pavement base layer, the vertical pressure of the pavement base layer under the action of dynamic load and the change process of the deformation of the pavement base layer under the action of the dynamic load of a vehicle through the sensor group 1 arranged at the bottom of the pavement base layer, and the sensors are arranged according to the set distance, so that the influence of any one sensor of two adjacent sensors on the mechanical structure of the pavement base layer can not cause interference on the measurement result of the other sensor, and the accuracy of the measured data can be ensured; in addition, the distance between the sensors can be maintained in a proper range, so that the electric connection between the sensors and the data collector can be facilitated, and the arrangement cost can be reduced.
Specifically, the concrete strain gauge 11 and the soil pressure gauge 12 are both provided at the vehicle wheel track of the traffic lane 2, and the multipoint displacement gauge 13 is provided at the hard shoulder 3. Because the frequency of vehicle ballast is high at the vehicle wheel track, the concrete strain gauge 11 and the soil pressure gauge 12 are arranged at the vehicle wheel track to obtain enough measurement data, so that the result obtained after the data are analyzed is more accurate and more universal; because the operating characteristic of multiple spot displacement meter 13, its self is because of guaranteeing not taking place the deformation, so need set up it in hard curb 3 department, this design on the one hand can make multiple spot displacement meter 13 can not be because of receiving rolling of vehicle and damage, and on the other hand can also keep the vertical state of self with the help of the support of hard curb 3 to can guarantee measuring result's accuracy.
More specifically, the concrete strain gauge 11 and the soil pressure gauge 12 are each electrically connected to the multipoint displacement meter 13, and can be electrically connected to a power source and a data collector via the multipoint displacement meter 13. The electric connection mode is preferably wired connection, and the wired connection mode can be used for conveniently supplying power to each sensor and enabling the transmission of the measurement result to be more stable; in addition, because the power is generally arranged outside the roadway 2 and near the hard road shoulder 3, the technical scheme can enable the multipoint displacement meter 13 to play a role of a transmission node, so that the wired line arrangement can be more orderly, the use of wires can be reduced, and the purpose of reducing cost is achieved.
Further specifically, the number of the concrete strain gauges 11 is 8, and any two concrete strain gauges 11 are matched to form 4 concrete strain gauge measurement units; the 4 concrete strain gauge measuring units can enclose a quadrilateral area; the number of the soil pressure gauges 12 is 1, and the soil pressure gauges are located outside the quadrangular region. The method comprises the following steps of dividing 8 concrete strain gauges 11 into 4 concrete strain gauge measuring units, and enclosing the 4 concrete strain gauge measuring units into a quadrilateral area, so that on one hand, a range measuring area can be formed, the probability of obtaining effective measuring data can be improved, and more measuring data can be obtained; on the other hand, since the concrete strain gauges 11 are not taken out after being embedded in the road base layer, 8 concrete strain gauges 11 are configured and divided into 4 concrete strain gauge measuring units, so that when one concrete strain gauge measuring unit fails or partially fails, the rest concrete strain gauge measuring units can still provide required measuring data.
More specifically, the two concrete strain gauges 11 in each concrete strain gauge measuring unit are arranged perpendicular to each other, so that one of the concrete strain gauges 11 can measure the bottom tensile strain of the base course in the driving direction, and the other concrete strain gauge 11 can measure the bottom tensile strain of the base course in the width direction of the driving lane. Because the pavement base layer is made of the materials of cement stabilized soil, lime stabilized soil, cement lime comprehensive stabilized soil, lime industrial waste residue stabilized soil and the like, when the materials are ballasted, the pavement base layer generates tensile stress along the driving direction and the width direction of the driving lane 2, so that the tensile stress in the driving direction and the width direction of the driving lane 2 need to be measured, and two concrete strain gauges 11 which are vertical to each other are arranged at the same position, and the influence of the ballasting on the strain degree of the position in the two directions can be analyzed. It should be noted that the two concrete strain gauges 11 in the concrete strain gauge measuring unit should be on the same horizontal plane, and particularly, the arrangement form of the T shape as shown in fig. 1 may be preferable.
Preferably, the quadrilateral area is a square area, and the set distance d1 between two adjacent concrete strain gauge measuring units is more than or equal to 60 cm. The arrangement among the sensors can be more compact by setting the quadrilateral area as the square area, so that fewer wires are needed during line connection, and the purpose of saving cost is achieved; since the concrete strain gauges 11 can support the bottom of the road base layer to a certain extent, and prevent the road base layer from tensile deformation along the driving direction or the width direction of the driving lane 2, in practical application, the distance between two adjacent concrete strain gauges 11 measuring deformation in the same direction needs to be considered, specifically, the relationship between the distance between two adjacent concrete strain gauges 11 measuring deformation in the same direction and the measurement result thereof is as shown in table 1, and it can be known from table 1 that when the distance between two concrete strain gauges 11 measuring strain in the same direction is greater than or equal to 60cm, the influence degree of the distance between two concrete strain gauges 11 on the measurement result of the corresponding variable is already very small, and the measurement error is within an acceptable range, so that the set distance d1 between two adjacent concrete strain gauge measurement units needs to be greater than or equal to 60cm, namely, the side length of the square area is greater than or equal to 60cm, and in order to make the arrangement between the sensors more compact, so as to achieve the purpose of reducing the usage amount of connecting wires in the process of wired connection, and thus reducing the arrangement cost, the side length of the square area may preferably be 60 cm.
TABLE 1 (Unit:. mu. epsilon)
Further preferably, the soil pressure gauge 12 is disposed in a quadrangular region in the front or rear in the traveling direction. Because concrete strain gauge 11 can play certain supporting role to the bottom of road surface basic unit, and road surface basic unit's rigidity is higher, when the ballast that receives, the peripheral region of department that receives can share partial load, if arrange concrete strain gauge 11 in the peripheral region of department that receives, because concrete strain gauge 11's supporting role, the load that peripheral region can be shared will be more, so if the not enough measuring result that can seriously influence the stress of interval distance between concrete strain gauge 11 and soil pressure gauge 12. Therefore, in practical use, the distance between the adjacent concrete strain gauges 11 and the adjacent soil pressure gauge 12 needs to be considered, and if the soil pressure gauge 12 is placed in the quadrangular region, the distance between the concrete strain gauge 11 and the soil pressure gauge 12 is easily made small, and interference of the concrete strain gauge 11 with the soil pressure gauge 12 is not sufficiently avoided, so that the soil pressure gauge 12 needs to be placed outside the quadrangular region; in order to obtain a sufficient amount of measurement data, soil pressure gauge 12 needs to be located at the wheel track of the vehicle, and soil pressure gauge 12 needs to be placed at the front or rear in the traveling direction in a quadrangular area.
Specifically, the set distance d2 between the soil pressure gauge 12 and the quadrangular zone in the traveling direction is not less than 60 cm. The relationship between the distance between the soil pressure gauge 12 and the quadrilateral area and the measurement result thereof is shown in table 2, and it can be known from table 2 that when the distance d2 between the soil pressure gauge 12 and the quadrilateral area is not less than 60cm, the influence degree of the measurement result of the distance between the soil pressure gauge 12 and the quadrilateral area corresponding to the force is already very small, and the measurement error is within an acceptable range, so that the distance can avoid the interference of the concrete strain gauge 11 on the measurement result of the soil pressure gauge 12, the accuracy of the measurement data is ensured, and the accuracy of the data analysis result can be further ensured; and in order to facilitate the wire connection between the multipoint displacement gauge 13 and the concrete strain gauge 11 and the earth pressure gauge 12 and to reduce the use of wires for cost saving, the spacing distance d2 in the traveling direction between the earth pressure gauge 12 and the quadrangular region may preferably be set to 60 cm.
TABLE 2 (Unit: kPa)
| Distance between each other | 30cm | 40cm | 50cm | 60cm | 70cm | 80cm | 90cm |
| Measurement results | 41.6 | 42.9 | 44.2 | 45.9 | 46.0 | 46.0 | 46.0 |
Further, the multipoint displacement meter 13 is disposed forward or rearward in the traveling direction of the traffic lane 2 in the measurement area formed by the concrete strain gauge 11 and the soil pressure gauge 12. Because concrete strain meter 11 and soil pressure meter 12 of locating the road surface basic unit bottom can exert an influence to the mechanics structure of road surface basic unit, and then can disturb the measuring result of the vertical deformation of different degree of depth departments in the road surface basic unit of multiple spot displacement meter 13, and when multiple spot displacement meter 13 is in the region on the hard curb 3 that corresponds right-and-left side of measuring region, still can not avoid the interference to the measuring result, so need make multiple spot displacement meter 13 put forward or after along the driving direction of lane 2 place in the measuring region that concrete strain meter 11 and soil pressure meter 12 formed in, in order to avoid the interference to the measuring result.
Preferably, the set distance d3 between the multipoint displacement meter 13 and the measuring area in the direction of travel is 80cm or more. The relationship between the distance between the multipoint displacement meter 13 and the measurement area and the measurement result thereof is shown in table 3, and it can be known from table 3 that when the distance between the multipoint displacement meter 13 and the measurement area is greater than or equal to 80cm, the influence degree of the distance between the multipoint displacement meter 13 and the measurement area on the measurement result of the vertical deformation of the base layer is very small, and the measurement error is within an acceptable range, so that the distance can avoid the interference on the measurement result of the multipoint displacement meter 13, and the accuracy of the measurement data is ensured; and in order to facilitate wired connection between the multipoint displacement meter 13 and the concrete strain gauges 11 and 12 and reduce the use of wires for cost saving, the spacing distance d3 in the traveling direction between the multipoint displacement meter 13 and the measurement area may preferably be set to 80 cm.
TABLE 3 (Unit: mm)
| Distance between each other | 40cm | 50cm | 60cm | 70cm | 80cm | 90cm | 100cm |
| Measurement results | 2.1 | 2.4 | 2.7 | 3.1 | 3.4 | 3.4 | 3.4 |
In summary, the main advantages of the present invention are: on the premise of ensuring that the sensors can not interfere with each other, the sensors are arranged in a more compact arrangement mode, so that wires required for line connection among the sensors and between the sensors and a data collector can be reduced, and the purposes of ensuring the accuracy of a measuring result and saving cost are achieved; the concrete strain gauges 11 and the soil pressure gauge 12 are arranged at the vehicle wheel tracks of the traffic lane 2, so that more measurement data sets can be conveniently acquired, the plurality of concrete strain gauges 11 are configured and divided into a plurality of concrete strain gauge measurement units, and when one concrete strain gauge measurement unit fails or partially fails, the rest of the concrete strain gauge measurement units can still provide required measurement data; arranging the multipoint displacement meter 13 at a hard shoulder enables the multipoint displacement meter 13 not to be damaged by crushing by the vehicle.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. The measuring system for intelligently acquiring the dynamic mechanical response of the pavement base is characterized by comprising a sensor group (1), a power supply and a data collector, wherein the sensor group (1) is arranged at the bottom of the pavement base, and sensors in the sensor group (1) are arranged at set intervals and are electrically connected with the power supply and the data collector so as to be capable of transmitting measured data; the sensor group (1) comprises a concrete strain gauge (11), a soil pressure gauge (12) and a multipoint displacement meter (13).
2. The system for intelligently acquiring the measurement system for the dynamic mechanical response of the road base layer is characterized in that the concrete strain gauge (11) and the soil pressure gauge (12) are arranged at the vehicle wheel track of the traffic lane (2), and the multipoint displacement meter (13) is arranged at the hard road shoulder (3).
3. The system for the intelligent acquisition of the measurement of the dynamic mechanical response of the base course according to claim 2, characterized in that the concrete strain gauges (11) and the soil pressure gauge (12) are electrically connected to the multipoint displacement gauge (13) and can be electrically connected to the power supply and to the data collector via the multipoint displacement gauge (13).
4. The system for intelligently acquiring the measurement system of the dynamic mechanical response of the base course is characterized in that the number of the concrete strain gauges (11) is 8, and any two concrete strain gauges (11) are matched to form 4 concrete strain gauge measurement units; the 4 concrete strain gauge measuring units can enclose a quadrilateral area; the number of the soil pressure gauges (12) is 1, and the soil pressure gauges are located outside the quadrangular area.
5. The system for intelligently acquiring the dynamic mechanical response of the roadbed according to claim 4, wherein the two concrete strain gauges (11) in each concrete strain gauge measuring unit are arranged perpendicular to each other, so that one concrete strain gauge (11) can measure the roadbed tensile strain in the driving direction, and the other concrete strain gauge (11) can measure the roadbed tensile strain in the width direction of a driving lane.
6. The system for intelligently acquiring the dynamic mechanical response of the pavement base according to claim 4, wherein the quadrilateral area is a square area, and the set distance d1 between two adjacent concrete strain gauge measuring units is more than or equal to 60 cm.
7. The system for the measurement of the dynamic mechanical response of the intelligent acquisition of the pavement base according to claim 4, characterized in that the soil pressure gauge (12) is placed in the quadrilateral area at the front or the back along the driving direction.
8. The system for intelligently acquiring the dynamic mechanical response of the pavement base according to claim 7, wherein the set distance d2 between the soil pressure gauge (12) and the quadrilateral area along the traffic direction is more than or equal to 60 cm.
9. The system for the intelligent acquisition of the dynamic mechanical response of the base course according to claim 2, characterized in that the multipoint displacement meter (13) is arranged in front of or behind the measurement area formed by the concrete strain gauge (11) and the soil pressure gauge (12) along the driving direction of the traffic lane (2).
10. The system for intelligently acquiring the dynamic mechanical response of the pavement base according to the claim 9, wherein the set distance d3 between the multipoint displacement meter (13) and the measuring area along the traffic direction is more than or equal to 80 cm.
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