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A method and device for measuring soil expansion and contraction under confining pressure control conditions

A technology for controlling conditions and soil, applied in measuring devices, using optical devices, instruments, etc.

Active Publication Date: 2022-07-08
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] First of all, the traditional method of measuring soil expansion and contraction often ignores the actual engineering conditions of the soil, so that the measurement of soil expansion and contraction without confining pressure control under conventional conditions is carried out. The soil expansion and contraction measured by this method There is a certain deviation between the deformation and the expansion and contraction deformation of the soil under actual working conditions

Method used

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  • A method and device for measuring soil expansion and contraction under confining pressure control conditions
  • A method and device for measuring soil expansion and contraction under confining pressure control conditions

Examples

Experimental program
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Effect test

Embodiment 1

[0043]A soil expansion and contraction measuring device under the condition of confining pressure control, comprising a test base 12, a cavity inside the test base 12, a rigid soil sample container 5 with upper and lower openings on the top surface of the test base 12, and a top of the test base 12. A permeable stone 10 is provided at the position below the rigid soil sample container 5, the rigid soil sample container 5 is communicated with the cavity in the test base 12 through the permeable stone, and the inner side wall of the rigid soil sample container 5 is provided with an impermeable latex bag 4, preferably The inner wall of the rigid soil sample container 5 is cylindrical, and the impermeable latex bag 4 is in the shape of a cylinder as a whole. One end of the water pipe 13 is connected, the other end of the water pipe 13 is connected to the volume pressure controller 9, and the volume pressure controller 9 is connected to the data acquisition processor 14. A laser dis...

Embodiment 2

[0049] A method for measuring soil expansion and contraction under confining pressure control conditions, using the soil expansion and contraction measuring device under confining pressure control conditions described in Example 1, the rigid soil sample container is a single, and the test soil body is in When the confining pressure is evenly distributed in the environment, measure the soil linear expansion rate and volume expansion rate during the process of hygroscopic expansion. The specific steps are as follows:

[0050] Step 1. Place the test soil sample in a rigid soil sample container that has been fixed with an impermeable latex bag, and set the confining pressure value K of the impermeable latex bag through the volume pressure controller according to the actual working conditions of the soil. 0 ;

[0051] Step 2. Carry out the hygroscopic expansion test. During this process, the confining pressure value K is maintained in the impermeable latex bag. 0 , the volume pres...

Embodiment 3

[0058] A method for measuring soil expansion and contraction under confining pressure control conditions, using the soil expansion and contraction measuring device under confining pressure control conditions described in Example 1, the rigid soil sample container is a single, and the test soil body is in When the confining pressure is evenly distributed in the environment, measuring the soil linear shrinkage and volume shrinkage during the process of dehumidification shrinkage, including the following steps:

[0059] Step 1. Place the test soil sample in a rigid soil sample container that has been fixed with an impermeable latex bag, and set the confining pressure value K of the impermeable latex bag through the volume pressure controller according to the actual working conditions of the soil. 0 ;

[0060] Step 2. Carry out the dehumidification shrinkage test. During this process, the confining pressure value K is maintained in the impermeable latex bag. 0 , the volume pressu...

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Abstract

The invention discloses a soil expansion and contraction measuring device under the condition of confining pressure control. The inner wall of the rigid soil sample container is provided with an impermeable latex bag. The impermeable latex bag is connected to the volume pressure controller through a straight-through threaded joint and a water pipe, and the volume pressure controller is connected to the data acquisition processor. There is a laser displacement meter, and the invention also discloses a soil expansion and contraction measurement method under the condition of confining pressure control.

Description

technical field [0001] The invention relates to the fields of soil mechanics, geotechnical engineering, environmental science and the like, in particular to a soil expansion and contraction measuring device under confining pressure control conditions, and also relates to a soil expansion and contraction measuring method under confining pressure control conditions , applicable but not limited to testing the expansion and contraction deformation of various types of expansive soil, bentonite, red clay, and replacement soil under different confining pressure control conditions during moisture absorption or dehumidification. Background technique [0002] First of all, the traditional method for measuring the expansion and contraction deformation of soil often ignores the actual engineering conditions of the soil, so that the soil expansion and contraction deformation measurement without confining pressure control under conventional conditions is carried out. There is a certain de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16G01B11/06
CPCG01B11/16G01B11/0608
Inventor 王凤华孔令伟柏巍周振华
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI