CN101358449B - Pore water pressure measuring device in foundation stabilization zone - Google Patents
Pore water pressure measuring device in foundation stabilization zone Download PDFInfo
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- CN101358449B CN101358449B CN200810196920XA CN200810196920A CN101358449B CN 101358449 B CN101358449 B CN 101358449B CN 200810196920X A CN200810196920X A CN 200810196920XA CN 200810196920 A CN200810196920 A CN 200810196920A CN 101358449 B CN101358449 B CN 101358449B
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- pore water
- water pressure
- soil body
- negative pressure
- sensor
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to a foundation under embankment inner pore water pressure measurement device which consists of a pore water pressure sensor, a sensor cable, a secondary instrument and a data automatic collection system; before soil reinforcement, the pore water pressure sensor is embedded through a method which conforms to relevant technical specifications, codes and design requirements, the sensor cable is led outside the foundation under embankment to protect the joint with the secondary instrument, and then the soil is reinforced through a preset reinforcing method; during the reinforcement process, the data automatic collection system connected with the secondary instrument can be adopted to sense the pressure of the pore water pressure sensor according to a certain frequency, so as to measure the internal pore water pressure of the soil in real time in different phases and different pressure ranges.
Description
Technical field
The present invention relates to a kind of ground stabilization district pore water pressure measuring device in the ground foundation engineering.Be particularly related to vacuum preloading, preloading and vacuum pre-pressed joint, reach vacuum-dewatering and add in the method for oscillating ground processing stabilization zone, the pore water pressure excursion is by just being pressed onto pore water pressure force measurement under the condition of negative pressure.
Background technology
The variation of pore water pressure is that vacuum preloading, preloading and vacuum pre-pressed joint and vacuum-dewatering add the method for oscillating ground and need one of important parameter that measures in handling, pore water pressure variation can reflect on the one hand and take various reinforcement measures that ground is carried out the transmission of the formation of excess pore water pressure, dissipation and vacuum in the soil body in the processing procedure, also can reflect the consolidation effect and the degree of consolidation of the soil body on the other hand.Therefore, accurately obtaining vacuum preloading, preloading and vacuum pre-pressed joint and vacuum-dewatering adds the size of stabilization zone pore water pressure in the processing of method for oscillating ground and changes very important.
At present, measure vacuum preloading both at home and abroad, when preloading and vacuum pre-pressed joint and vacuum-dewatering add the variation of method for oscillating ground processing mesopore water pressure, formation for excess pore water pressure in the soil body, dissipate, generally all be to adopt the pore water pressure probe to measure, and the vacuum on soil body top layer, be to adopt vacuum meter to measure, adopt the method for measuring water level to measure the variation of inside soil body water level, though disclosing " level measurement device and method in a kind of vacuum preloading ground stabilization district ", Chinese invention patent ublic specification of application CN100359297C can measure under the condition of negative pressure true groundwater table in the ground preloading district, but because these methods all need be installed devices such as surveying pipe in being reinforced the soil body, and the pipe fitting in these devices all needs to pass diaphragm seal, and allowance is surveyed mouth outside diaphragm seal, make the complex structure of the inaccurate or measuring equipment of groundwater table measurement under the inside soil body condition of negative pressure, the testing operating time is long, efficient is low, and can't realize that the real-time continuous of WATER LEVEL CHANGES measures.
Summary of the invention
The problem that the object of the invention will solve is: overcome present vacuum preloading, preloading and vacuum pre-pressed joint use, and vacuum-dewatering adds in the processing of method for oscillating ground, excess pore water pressure, the vacuum on soil body top layer and the measurement of the groundwater table under the condition of negative pressure, need to adopt diverse ways and device to measure, and can not realize the defective that real-time continuous measures, develop the device that a kind of vacuum preloading ground stabilization district pore water pressure is measured, can realize adopting a kind of sensor to reach excess pore water pressure, the purpose that the groundwater table real-time continuous measures under the vacuum on soil body top layer and the condition of negative pressure.
For achieving the above object, the invention provides a kind of ground stabilization district pore water pressure measuring device.This device is made up of pore water pressure sensor, sensor cable, secondary meter, the automatic data acquisition system of measuring negative pressure; The pore water pressure sensor (1) that it is characterized in that measuring negative pressure is measured the certain excess pore water pressure except that satisfying, and also wants to satisfy a negative atmospheric requirement of mensuration; When carrying out the pore water pressure measurement of ground stabilization district, earlier the pore water pressure sensor (1) that can measure negative pressure is carried out the calibration of malleation and condition of negative pressure downforce and output parameter relation, the pore water pressure sensor (1) that can measure negative pressure then is embedded in the soil body (6), sensor electrical cable (2) is drawn to the soil body (6) outside and is connected with secondary meter (3), and secondary meter (3) links to each other with automatic data acquisition system (4) again.Measure the soil body (6) and reinforce in different phase, the different pressures scope variation of groundwater table under the vacuum on excess pore water pressure, soil body top layer and condition of negative pressure in the soil body (6) by being embedded in the pore water pressure sensor that can measure negative pressure (1) in the soil body (6).
Before the soil body (6) is reinforced; according to meeting the relevant art rules; the method of standard and designing requirement is buried the pore water pressure sensor that can measure negative pressure (1) that rate is reserved underground; sensor electrical cable (2) is guided to stabilization zone, and to be convenient to the guarded by location that is connected with secondary meter (3) outward good; can carry out consolidation process to the soil body (6) according to predetermined reinforcement means then, in the consolidation process process, can adopt the automatic data acquisition system (4) that links to each other with secondary meter (3) to survey the force value of reading each pore water pressure sensor that can measure negative pressure (1) according to certain frequency.After taking this method, just can before reinforcing, the soil body (6) bury underground, not only can measure rising, the dissipation of taking the inner positive pore water pressure of the soil body (6) in the various soil bodys (6) the reinforcement measure process, can also measure vacuum, the distribution situation of negative pressure in the soil body (6), realize that the real-time continuous of the soil body (6) reinforcing overall process pore water pressure measures.
Description of drawings
Fig. 1 is a kind of ground stabilization of the present invention district pore water pressure measuring device structure chart.
As shown in the figure: pore water pressure sensor 1, sensor electrical cable 2, secondary meter 3, automatic data acquisition system 4, data wire 5, the soil body 6, vertical drainage passage 7, sand cushion 8, diaphragm seal 9, exhaust tube 10, the vacuum extractor 11 that can measure negative pressure.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.Fig. 1 is a kind of ground stabilization of the present invention district pore water pressure measuring device structure chart.This device is made up of the pore water pressure sensor that can measure negative pressure, sensor cable, secondary meter, automatic data acquisition system; Earlier in the soil body 6 that needs reinforcement, set vertical drainage passage 7, bury the pore water pressure sensor 1 that can measure negative pressure according to the method for relevant art rules, standard and designing requirement underground at the different depth place of the soil body 6 then, sensor electrical cable 2 is guided to stabilization zone, and to be convenient to the guarded by location that is connected with secondary meter 3 outward good; The thick sand cushion 8 of 30cm to 50cm is laid on surface at the soil body 6, surface evening with sand cushion 8, lay diaphragm seal 9 on the surface of yarn bed course 8, and guarantee the sealing of diaphragm seal 9, the position good seal that the exhaust tube 10 that vacuumizes and sensor electrical cable 2 are passed diaphragm seal 9 at the stabilization zone periphery.Sensor electrical cable 2 and secondary meter 3 are connected, again secondary meter 3 is linked to each other with automatic data acquisition system 4 by data wire 5, read the initial value of each pore water pressure sensor that can measure negative pressure 1.Can open 11 pairs of soil bodys 6 of vacuum extractor after ready and apply negative pressure, in vacuumizing the consolidation process process, can adopt the automatic data acquisition system 4 that links to each other with secondary meter 3 to survey the force value of reading each pore water pressure sensor that can measure negative pressure 1 according to certain frequency.
The present invention is owing to adopted the pore water pressure sensor 1 that can measure negative pressure, not only can measure excess pore water pressure and vacuum, can also measure the negative pore water pressure under the situation of vacuumizing, so just can economize installing of vacuum meter and groundwater table sighting tube under the striping, and structure is simpler, it is more convenient to install, easy to operate.Adopt a kind of pore water pressure sensor to realize that the overall process real-time continuous of groundwater table under the vacuum on positive excess pore water pressure, soil body top layer and the condition of negative pressure measures.And be convenient to extensive, multi-sensor data and measure synchronously, operating efficiency is improved greatly.
Claims (1)
1. a ground stabilization district pore water pressure measuring device is made up of pore water pressure sensor, sensor cable, secondary meter, the automatic data acquisition system of measuring negative pressure; The pore water pressure sensor (1) that it is characterized in that measuring negative pressure is measured the certain excess pore water pressure except that satisfying, and also wants to satisfy a negative atmospheric requirement of mensuration; When carrying out the pore water pressure measurement of ground stabilization district, earlier the pore water pressure sensor (1) that can measure negative pressure is carried out the calibration of malleation and condition of negative pressure downforce and output parameter relation, the pore water pressure sensor (1) that can measure negative pressure then is embedded in the soil body (6), sensor electrical cable (2) is drawn to the soil body (6) outside and is connected with secondary meter (3), secondary meter (3) links to each other with automatic data acquisition system (4) again, measures the soil body (6) reinforcing different phase by the pore water pressure sensor that can measure negative pressure (1) that is embedded in the soil body (6), excess pore water pressure in the soil body (6) in the different pressures scope, the variation of groundwater table under the vacuum on soil body top layer and the condition of negative pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810196920XA CN101358449B (en) | 2008-09-11 | 2008-09-11 | Pore water pressure measuring device in foundation stabilization zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810196920XA CN101358449B (en) | 2008-09-11 | 2008-09-11 | Pore water pressure measuring device in foundation stabilization zone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101358449A CN101358449A (en) | 2009-02-04 |
| CN101358449B true CN101358449B (en) | 2010-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810196920XA Expired - Fee Related CN101358449B (en) | 2008-09-11 | 2008-09-11 | Pore water pressure measuring device in foundation stabilization zone |
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| CN (1) | CN101358449B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205956B (en) * | 2012-12-25 | 2014-10-01 | 广东省长大公路工程有限公司 | Method for controlling roadbed loading rate by observing pore water pressure |
| CN103233453B (en) * | 2013-04-18 | 2015-08-19 | 天津大学 | A kind of original position soil body surveying method |
| CN103344378A (en) * | 2013-06-28 | 2013-10-09 | 成都汉康信息产业有限公司 | Telemetering type soil permeation water pressure measuring device |
| CN103711117A (en) * | 2014-01-17 | 2014-04-09 | 邓立新 | Automatic intelligent vacuum preloading monitoring system |
| CN107083769B (en) * | 2017-06-23 | 2022-06-21 | 交通运输部天津水运工程科学研究所 | Negative pressure calibration device and method for vibrating wire type pore water pressure gauge |
| CN112729664B (en) * | 2020-12-07 | 2021-11-05 | 清华大学 | Method for determining the internal pressure of a fluid in a porous soft medium |
| CN113295307A (en) * | 2021-05-20 | 2021-08-24 | 福州大学 | Flexible force touch sensing array capable of realizing body multi-position pressure bearing detection |
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2008
- 2008-09-11 CN CN200810196920XA patent/CN101358449B/en not_active Expired - Fee Related
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| CN101358449A (en) | 2009-02-04 |
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Granted publication date: 20100901 Termination date: 20160911 |