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Tunnel rockburst grade evaluation method considering internal and external factors

A grade evaluation and rockburst technology, applied in the field of grade evaluation, can solve problems such as single factor, only consider stress or its own inherent properties, and achieve the effect of eliminating influence, improving practicability and accuracy, and good scientific control

Pending Publication Date: 2022-05-13
HEZE UNIV +2
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  • Application Information

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Problems solved by technology

[0004] The present invention proposes a tunnel rockburst grade evaluation method that considers internal and external factors. This factor overcomes the deficiency that the existing rockburst tendency index criterion only considers the stress or a single

Method used

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  • Tunnel rockburst grade evaluation method considering internal and external factors
  • Tunnel rockburst grade evaluation method considering internal and external factors
  • Tunnel rockburst grade evaluation method considering internal and external factors

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Embodiment 1

[0036] Taking a section of a tunnel to be evaluated for rockburst risk as an example, first consult the geological data to obtain the in-situ stress information σ 1 , and then sample the granite rock in this area and process it into a standard sample. The sample uniaxial compression test is carried out on the MTS815 electro-hydraulic servo material testing machine to obtain the full stress-strain curve of the granite uniaxial compression. Then read the peak intensity σ from the full stress-strain curve c , strain ε before peak value b and the peak post-strain ε a , and then evaluate the rockburst risk level in this area according to the index method established by this patent, as follows:

[0037] (1) Consult geological data to obtain the maximum principal stress σ in the area to be evaluated for rockburst risk in the tunnel 1 =49.6MPa

[0038] (2) The rock blocks retrieved from the rockburst area to be tested in the project are processed into cylindrical rock samples with...

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Abstract

The invention discloses a tunnel rockburst grade evaluation method considering internal and external factors, and aims to overcome the defect that existing rockburst grade evaluation indexes only consider inherent rockburst tendency of rocks or only consider external stress factors, and the tunnel rockburst grade evaluation method considering the internal and external factors is invented on the basis of previous research. According to the method, sufficient and necessary conditions for occurrence of the rockburst, namely external driving power for occurrence of the rockburst, namely stress conditions, and internal conditions for occurrence of the rockburst, namely inherent energy storage and energy consumption characteristics of rocks, are fully considered, and the rockburst occurrence grade of underground engineering such as tunnels and mines can be accurately and rapidly pre-judged by applying the method; and a new technical support is provided for scientific management and control of rock burst risks and safe and rapid construction.

Description

technical field [0001] The invention relates to the field of tunnel rockburst risk assessment, in particular to a tunnel rockburst level assessment method considering internal and external factors, which is applicable to various water conservancy, hydropower, transportation, and other tunnels where rockburst risks need to be assessed. Background technique [0002] With the rapid development of society and economy, more and more related underground projects in the fields of mines, water conservancy and hydropower, transportation, nuclear waste disposal and national defense are gradually transferred to the deep, especially with the construction of the Sichuan-Tibet Railway, more and more Many long, large and deeply buried tunnels appear, the rock mass occurrence conditions become more complex, and the rockburst disasters induced by excavation (mining) become more and more serious. Rockburst is an extremely complex dynamic geological disaster, which is the result of the sudden ...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N1/08G01N1/28
CPCG01N3/12G01N1/08G01N1/28
Inventor 李鹏翔汪宗文孙书彬陈炳瑞肖亚勋王青元陈立
Owner HEZE UNIV