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True triaxial test method for simulating shearing type rock burst

A test method, true triaxial technology, applied in the direction of testing the strength of materials, measuring devices, instruments, etc. by applying a stable shear force

Inactive Publication Date: 2017-02-22
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] To sum up, there is no reference method for the indoor test simulation of shear rockburst within a certain depth range near the excavation boundary.

Method used

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  • True triaxial test method for simulating shearing type rock burst
  • True triaxial test method for simulating shearing type rock burst
  • True triaxial test method for simulating shearing type rock burst

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments described here are for illustration only and do not limit the invention.

[0035]After the excavation of deep underground caverns, the stress state of the rock mass within a certain depth range near the boundary is as follows: figure 1 shown. The present invention adopts the true triaxial loading mode of one-sided air and five-sided force to simulate the above stress state, as figure 2 shown. Among them, the vertical stress σ z Simulated field tangential stress σ θ , horizontal stress σ x Axial stress σ of simulated site hole a , horizontal stress σ y Simulation site radial stress (distribution) σ r . With reference to the stress redistribution process under site excavation disturbance, formulate and adopt image 3 The test load path is shown. The hard and brittle rock specimens with good integr...

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Abstract

The invention discloses a true triaxial test method for simulating shearing type rock burst. In the method, a true triaxial loading path and boundary condition characterized in that a single surface is free and five surfaces are stressed is adopted, a test piece with a large size is adopted, a certain three-dimensional load is applied, a loading rate of one direction is controlled, and a cuboid rock sample of which the single side is free under a three-dimensional compression stress state is used for simulating a special mechanical behavior of a field surrounding rock representativeness rock unit in a tangential stress centralization process. When the method is adopted, an inoculation and generation overall process of the shearing type rock burst can reappear in a laboratory, the problem that a traditional indoor test method cannot reasonably simulate the shearing type rock burst under a complex stress condition is solved, and the true triaxial test method has important practical significance and academic value for the mechanism and prediction studies of the type of rock burst.

Description

technical field [0001] The invention belongs to the field of rock mechanics test research, in particular to a true triaxial test method for simulating shear-type rockburst. Background technique [0002] In recent years, the rapid development of mining, water conservancy, transportation, nuclear waste treatment and other fields has led to the continuous expansion of the depth and scale of underground engineering excavation, and the increasing ground stress has induced frequent rockburst disasters in surrounding rocks near the excavation boundary. Rockburst refers to the release of radial (perpendicular to the excavation boundary) stress and continuous concentration of tangential (parallel to the excavation boundary and perpendicular to the hole axis) stress during the excavation of deep underground engineering. The ejection failure phenomenon of brittle surrounding rock. Due to the sudden occurrence and limited underground engineering space, rockbursts often cause casualties...

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Application Information

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IPC IPC(8): G01N3/24G01N3/06
CPCG01N3/24G01N3/06G01N3/068G01N2203/0025G01N2203/0048G01N2203/0062G01N2203/0075G01N2203/0256G01N2203/0676
Inventor 苏国韶翟少彬赵斌胡旭张纲亮闫召富
Owner GUANGXI UNIV
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