A test device and method for rock direct shear-seepage

Abstract

The invention discloses a test device and method for rock direct shear-seepage, and relates to rock mechanics test technology. The triaxial compression shear test device involved in the present invention comprises an axial shear indenter (1), a pressure chamber (3), a sealing tape (4), a deformation rubber sleeve ( 5), a test specimen (6) with prefabricated joints, and a rigid cylindrical backing plate (8). The test method and test piece preparation method adopted by the present invention fully utilize the characteristics of the rock triaxial compression test, provide stable confining pressure to the test piece through the oil pressure chamber, and use a special method to prepare the prefabricated jointed rock test piece, and at the same time create The conditions for the shear test were performed, followed by the seepage test. Using this method and using a triaxial test instrument to conduct a shear-seepage test makes the obtained data more accurate and reliable, and to a greater extent simulates the shear failure of the rock under natural conditions.

Description

technical field [0001] The invention relates to a test device and method for direct shear-seepage of rock, in particular to a test method for shear-seepage by using rock triaxial compression test equipment. Background technique [0002] The coupling characteristics of seepage and shear in deep rock mass joints has become a key scientific problem that needs to be solved urgently in the stability analysis of large deep underground engineering. The full shear seepage coupling test of rock joints is the most effective and direct method to study the hydraulic characteristics of rock joints. The rock shear strength and shear strength parameters are the premise and basis for numerical simulation and stability analysis of surrounding rock deformation. [0003] At present, the test methods for rock shear strength mainly include direct shear test and triaxial shear test. [0004] The rock direct shear test device and test method are relatively simple, and can be carried out in the l...

AI Technical Summary

Problems solved by technology

However, there are many deficiencies in the determination of rock shear strength by conventional direct shear tests.

[0005] 1. The sample can only undergo shear failure along the pre-selected failure surface in the direct shear instrument, ignoring the internal defects of the sample, and can only simulate the shear failure of the rock under unidirectional compression;

[0006] 2. During the direct shear test, the normal stress on the sample will change with the increase of shear load and displacement, which cannot produce a stable confining pressure on the sample, and the measured shear strength may be too small ;

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