Rock sheet true three-direction collapse test device and method

Abstract

The invention discloses a true three-direction collapse test device and method for a rock sheet. The device comprises a spherical pressure head, a frame type supporting base, a front pressure head, a rear pressure head, a left pressure head and a right pressure head, the spherical pressure head is located above the frame type supporting base, and the rock sheet sample is horizontally located between the spherical pressure head and the frame type supporting base; the front pressure head, the rear pressure head, the left pressure head and the right pressure head are respectively opposite to four side vertical surfaces of the rock sheet sample, strip-shaped cushion blocks are arranged on loading surfaces of the four pressure heads, and a simple support assembly and a rock sample deformation measuring assembly are arranged between the frame type supporting base and the rock sheet sample. The method comprises the following steps: selecting a three-rigidity true triaxial testing machine, and mounting a spherical pressure head, a frame type supporting base, a front pressure head, a rear pressure head, a left pressure head and a right pressure head on an actuator of the testing machine; mounting a simple support assembly; installing a rock sample deformation measuring assembly; installing a rock sheet sample; and starting the three-rigidity true triaxial testing machine, and applying a true three-way load to the rock sheet sample until the sample is collapsed and damaged.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics tests, and in particular relates to a true three-dimensional buckling test device and method for rock thin plates. Background technique [0002] The deformation mechanism of layered rock mass is very complex and the types are varied. Among many deformation failure modes, buckling failure is one of the typical failure modes of layered rock mass under high ground stress, and buckling failure is also a problem that plagues the tunnel and underground engineering circles. It is one of the major geological disasters, so it is necessary to carry out laboratory tests on layered rock buckling failure under high ground stress. [0003] At present, most of the existing laboratory tests of layered rock collapse and failure are beam three-point bending tests, but there are differences in shape between beams and rock thin plate samples, and there are also significant differences in the way of stress and ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the existing laboratory tests of layered rock collapse and failure are beam three-point bending tests, but there are differences in shape between beams and rock thin plate samples, and there are also significant differences in the way of stress and boundary constraints from those of the rock formation on site. , resulting in rock bending deformation failure law obtained based on beam three-point bending test cannot be directly used to evaluate layered rock mass

In addition to the three-point bending test of the beam, the rock plate test is also included, but the four-sided simply supported method for the rock thin plate is used in the rock plate test, and the true three-dimensional loading of the rock thin plate sample cannot be realized.

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