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True triaxial test method of simulating extensional rock burst

A technology for simulating tensile type and test method, applied in the field of true triaxial test simulating tensile type rockburst

Inactive Publication Date: 2017-03-15
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 laboratory test simulation of tensional rockburst within a certain depth range near the excavation boundary

Method used

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  • True triaxial test method of simulating extensional rock burst
  • True triaxial test method of simulating extensional rock burst
  • True triaxial test method of simulating extensional rock burst

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Embodiment Construction

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

[0035] After the deep underground cavern is excavated, the stress state of the rock mass within a certain depth near the boundary is like figure 1 Shown. The present invention adopts a special true triaxial loading method with one-sided hollow and five-sided force to simulate the above-mentioned stress state, such as figure 2 Shown. Among them, the vertical stress σ z Simulate field tangential stress σ θ , The horizontal stress σ x Axial stress σ of simulated site hole a , The horizontal stress σ y Simulate field radial stress (distribution)σ r . With reference to the stress redistribution process under excavation disturbance on site, formulate and adopt image 3 Test loading path shown. Select hard and brittle rock specimens with good in...

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Abstract

The invention discloses a true triaxial test method of simulating an extensional rock burst. The method employs a true triaxial loading route and a boundary condition of single side freeness and five side stressing, and utilize a cuboid rock sample in a single side freeness and three directional compressive stress state to simulate a special mechanical behavior of a representative rock unit of field wall rock in a tangential stress concentration process by applying a certain three directional load and controlling a loading speed of one direction. The method can be used for representing a whole inoculation and occurrence process of the extensional rock burst in a laboratory. The method solves the problem that the traditional indoor test method cannot simulate the extensional rock burst under a complex stress condition reasonably and has important practical significance and academic value in promoting mechanism and prediction studies of the rock burst.

Description

Technical field [0001] The invention belongs to the field of rock mechanics test research, and in particular relates to a true triaxial test method for simulating tensile rock burst. Background technique [0002] In recent years, large-scale geotechnical engineering construction has gradually expanded to the depths, and the high ground stress environment in which it is located can easily induce rock burst disasters. Rockburst refers to the release of radial (perpendicular to the excavation boundary) stress during the excavation of deep underground engineering, and the continuous concentration of stress in the tangential direction (parallel to the excavation boundary and vertical to the tunnel axis), and the hardening within a certain depth near the excavation boundary The ejection failure phenomenon of brittle surrounding rock. Due to the sudden occurrence and limited underground engineering space, rock bursts often cause casualties, equipment damage, and severe damage to the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N1/28
CPCG01N3/08G01N1/28
Inventor 苏国韶翟少彬赵斌胡旭张纲亮闫召富
Owner GUANGXI UNIV
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