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Test method for studying rock joint surface morphology evolution in whole shear process

A test method, shear test technology, applied in the direction of applying stable shear force to test the strength of materials, measuring devices, instruments, etc., can solve the problems of overestimation of processing methods, large gaps, etc., and achieve true and repeatable results sexual effect

Active Publication Date: 2017-04-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of treating the area where the upper and lower joint surfaces intersect as the failure area by default greatly overestimates the damage area during the joint shearing process, and can only obtain the approximate failure at the specified shear displacement, and the obtained result is far from the actual one.

Method used

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  • Test method for studying rock joint surface morphology evolution in whole shear process
  • Test method for studying rock joint surface morphology evolution in whole shear process
  • Test method for studying rock joint surface morphology evolution in whole shear process

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment studies the test method of rock joint surface morphology evolution in the whole process of shearing, and the test method includes the following steps:

[0042] 1) Copy the natural rock joint surface with fine mold silica gel: select the natural rock joint surface, cut it into a plane size of 100mm×200mm, put it into the steel mold 1, and evenly paint the surface of the natural rock joint 2 and the inner side of the steel mold 1 for demoulding Agent; Weigh the fine mold silica gel and curing agent with a mass ratio of 100:1, stir until fully mixed, put into the container, the colloid accounts for no more than 50% of the volume of the container, and put it into a vacuum cylinder to evacuate to eliminate the silica gel. air bubbles; the vacuumed silica gel layered evenly poured on the surface of the natural rock joint 2, let stand for 24 hours and then demolded to obtain the silica gel joint sample 3, as figure 1 shown;

[0043] 2) Pouring the upper part 5...

Embodiment 2

[0050] In this example, the water-cement ratio of the α high-strength gypsum material is 1:3, and the rest are the same as Example 1.

Embodiment 3

[0052] In this example, the water-cement ratio of the α-high-strength gypsum material is 1:5, and the rest are the same as Example 1.

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Abstract

The invention relates to a test method for studying rock joint surface morphology evolution in a whole shear process. The method includes: using an artificial rock material to copy a rock joint surface to obtain multiple groups of joint samples with completely identical surface morphology, scanning all the joint samples before testing to obtain joint surface initial morphology data; conducting a group of joint shear test to obtain a complete joint shear displacement-shear stress test curve; in the follow-up study process, selecting shear displacements corresponding to different joint shear stress states, and performing multiple groups of joint shear test, stopping each group of test at different shear displacement positions, then scanning the joint surface morphology data obtained by the groups of test, and performing comparison with the morphology data of each sample before test so as to obtain morphology evolution data in the joint shear process. Compared with the prior art, the method provided by the invention has the advantages of simplicity and convenience, more accurate and reliable test result, good repeatability and wide application range, thus having very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of rock and soil mechanics tests, and relates to a test method for studying the shape evolution of rock joint surfaces in the whole shearing process. Background technique [0002] In nature, rock mass is composed of rock blocks and joints (structural planes). The existence of joints has a significant impact on the properties of rock mass. The existence of joints not only weakens the strength of rock mass, but also provides a channel for water flow, inducing various kind of disaster. The surface morphology of joints is the main factor affecting the shear mechanical properties and seepage characteristics of joints. In the process of joint shearing, as the upper and lower joint surfaces are dislocated and protrusions are continuously sheared, the surface morphology of joints changes all the time. The evolution of the joint surface morphology during the shearing process directly reflects the changes in the mech...

Claims

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Application Information

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IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0025
Inventor 桂洋夏才初钱鑫
Owner TONGJI UNIV
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