Rock sheet true three-direction collapse test device and method

A test device and thin plate technology, applied in the direction of testing material strength by applying a stable bending force, can solve the difference in shape between beam and rock thin plate samples, fail to realize true three-dimensional loading of rock thin plate samples, and rock bending The law of deformation and failure cannot be directly used to evaluate problems such as layered rock mass

CN114397195APending Publication Date: 2022-04-26NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-04-26

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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.
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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 ...

Examples

Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as Figure 1~6 As shown, a true three-way buckling test device for rock thin plates includes a spherical indenter 1, a frame-type support base 2, a front indenter 3, a rear indenter 4, a left indenter 5 and a right indenter 6; The spherical indenter 1 is located directly above the frame-type support base 2, and the rock thin-plate sample 7 is horizontally located between the spherical indenter 1 and the frame-type support base 2; The side elevation is facing; the rear indenter 4 is facing the rear side elevation of the rock thin plate sample 7; the left indenter 5 is facing the left side elevation of the rock thin plate sample 7; The right indenter 6 is directly opposite to the right side elevation of the rock thin plate sample 7; the loading surfaces of the front indenter 3, the rear indenter 4, the left indenter 5 and t...