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Field shear test method

A shear test, on-site technology, applied in the direction of using a stable shear force to test the strength of materials, using a stable tension/pressure test to test the strength of materials, instruments, etc., can solve the complicated operation steps and the traditional methods are difficult to operate. and other problems, to achieve the effect of accurate data, uniform force, and reduced test cost

Active Publication Date: 2020-07-31
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is what makes the traditional method have the characteristics of difficult operation and cumbersome and complicated operation steps.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] See Figure 1-10 , The field shear test method, which includes the following steps:

[0054] Step 1: Perform drilling operations on the rock and soil mass 1 on site to form holes 2 and make multiple holes 2 enclose the designated shear area of ​​the rock and soil mass 1;

[0055] Step 2: Select the hole 2 on one side, and install the compressive stress sheet 4 for monitoring the stress inside it to realize the in-situ test of the shear stress of the rock and soil body 1;

[0056] Step 3: Install gasket 5 close to the position of compressive stress sheet 4;

[0057] Step 4: Fill multiple sets of relative holes 2 with an expansion agent 3, and the expansion agent 3 generates an expansion force on the hole 2 where the compressive stress sheet 4 is installed, so that the rock and soil body 1 has a dislocation effect, and the stress is monitored in real time;

[0058] Step 5: When the designated shear area of ​​the rock-soil body 1 is damaged, the test ends, and the water in the caps...

Embodiment 2

[0061] Further, the working conditions that can be simulated by the test method include: simulating rainfall working conditions by pouring water into the hole 2;

[0062] Furthermore, by loading the top of the rock-soil mass 1, the shear stress conditions under different normal stresses are simulated;

[0063] Furthermore, by filling the holes 2 with different depths layer by layer with the expansion agent 3, the shear stress of each layer is monitored, and the multi-layer and multi-directional shear stress conditions are simulated.

[0064] Further, the filling method of the expansion agent 3 in the step 4 is that the bottom of a hole 2 of a certain group and its relatively high position relative to the hole 2 are filled in multiple groups of relative holes;

[0065] Further, in the step 4, the expansive agent 3 generates an expansive force, which causes the designated rock and soil shear area to produce dislocation and deformation, thereby causing shear failure. At the moment of fail...

Embodiment 3

[0078] Single-layer shear construction steps:

[0079] Step1: Drill holes 2 in the rock and soil mass 1 according to the pre-planning;

[0080] Step2, select the hole 2 on one side and paste the compressive stress sheet 4 on the side close to the rock and soil 1, and install the gasket 5 close to the compressive stress sheet 4;

[0081] Step3, put the expansion agent reaction box containing the expansion agent in the relatively high position of the hole 2 selected by Step2 and its opposite hole 2;

[0082] Step4, wait for the expansion agent 3 to generate expansion force, and monitor the stress in real time;

[0083] Step5: When the designated rock-soil body is damaged in the shearing area, the test ends, and the water in the capsule of the steel gasket is extracted to recover the gasket 5.

[0084] Step6, backup the measured data of the shear test, and analyze the test data later.

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Abstract

The invention provides a field shear test method, which comprises the following steps of drilling a hole in a field rock-soil body to form a specified rock-soil body shear area by the hole in a surrounding mode, filling an expanding agent into a plurality of groups of opposite holes, and generating a dislocation effect on the rock-soil body when the expanding agent generates an expanding force soas to generate shear failure. A pressure stress sheet is installed in the hole filled with the expanding agent to monitor stress, field test of the shear stress of the rock-soil body is achieved, meanwhile, a steel gasket can be installed on the side where the expanding force is generated, the expanding force borne by the rock-soil body is homogenized, and measured data are accurate. Expanding agents are filled in different depths, namely different positions, of the hole layer by layer, the shear stress of each layer is monitored, and multi-layer shear is achieved. Simulable working conditionsinclude that rainfall working conditions are simulated by means of filling water into holes; loading is carried out on the top of a rock-soil body, and shear stress working conditions under differentnormal stresses are simulated; the holes with different depths are filled with expanding agents layer by layer, the shear stress of each layer is monitored, and the multi-layer and multi-direction shear stress working conditions are simulated.

Description

Technical field [0001] The invention belongs to the field of shear test devices, and particularly relates to a field shear test method. Background technique [0002] The principle of the shear test is based on Coulomb's law, the internal friction force of the soil is proportional to the normal pressure on the shear surface. The same kind of soil is prepared into several soil samples, which are respectively under different normal pressures along a fixed Horizontal shear force is directly applied to the shear surface, and the shear stress when it fails to shear is the shear strength. In order to make the test results as close to the actual situation as possible, the traditional shear test usually uses various shear test devices and corresponding test methods to simulate the working conditions of the real standard workpiece, and apply shear force to the sample until it breaks to determine its Shear strength. Common test methods are: single shear test, double shear test, punching s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/24G01N3/06
CPCG01N3/08G01N3/24G01N3/066G01N2203/0067G01N2203/027G01N2203/0298G01N2203/0676
Inventor 刘杰何卓文王瑞红熊博文张瀚李远航陶鑫波骆浩包顺王芳李洪亚唐洪宇谢晓康
Owner CHINA THREE GORGES UNIV
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