Method and device for predicting rock burst in tunnel, and storage medium and system

A prediction method and technology of rockburst, applied in the direction of measuring device, using stable tension/pressure test material strength, instruments, etc., can solve the problems of unsatisfactory application effect and high cost of rockburst prediction

Inactive Publication Date: 2018-03-02
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is expected to provide a tunnel rockburst prediction scheme to solve the above-mentioned problems of high cost of rockburst prediction in the construction stage and unsatisfactory application effect

Method used

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  • Method and device for predicting rock burst in tunnel, and storage medium and system
  • Method and device for predicting rock burst in tunnel, and storage medium and system
  • Method and device for predicting rock burst in tunnel, and storage medium and system

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Embodiment 1

[0057] Embodiments of the present invention provide a rockburst prediction method during tunnel construction, specifically comprising:

[0058] Based on the idea of ​​strength-stress ratio, the maximum in-situ stress ratio between the strength of the Hoek-Brown rock mass and the original rock stress field at the depth to be measured in the direction perpendicular to the hole axis is taken as the limit value of the rockburst prediction index, and according to the size of the limit value of the rockburst prediction index , to judge the rockburst level.

[0059] Hoek-Brown Rock Mass Strength Where: σ ′ 3 is the minimum principal stress when the rock mass fails, MPa; σ ci is the uniaxial compressive strength of the rock block, MPa; is the material constant m i The discounted value of m i It reflects the softness and hardness of the rock, and its value ranges from 0 to 25; GSI is the geological body strength index; D is the degree of construction disturbance, and its value ...

Embodiment 2

[0092] The region where a hydropower TBM diversion tunnel project relies on has strong tectonic movement, frequent seismic activities, and complex topographic and geological conditions, such as Figure 16 shown. The excavation tunnel passes through some continuously developed closed short and small fold structures (synclines, anticlines), and the axial plane of the folds strikes NW300~330°. Affected by local structures, the lithological boundaries and occurrences of strata have changed greatly, and the disturbance mechanism of local faults is very common, so there is a great risk of rockbursts. According to different rock mass characteristics, the experienced Barton rock mass Q classification system is divided into 5 grades from Q1 to Q5. The maximum buried depth of the hydropower diversion tunnel is nearly 2000m, and the Q2 and Q3 strata with a buried depth of more than 1000m account for about 45%, corresponding to the Tertiary The lithology of the surrounding rocks in the M...

Embodiment 3

[0113] The embodiment of the present invention also provides a rockburst prediction method of a tunnel, comprising the following steps:

[0114] Obtain the comprehensive rock mass strength and maximum ground stress at the depth to be measured;

[0115] Calculating the rockburst prediction index threshold value, the rockburst prediction index threshold value is the ratio of the comprehensive rock mass strength to the maximum ground stress;

[0116] According to the size of the limit value of the rockburst prediction index, the grade of the rockburst is judged.

[0117] The comprehensive rock mass strength is the Hoek-Brown rock mass strength, and the Hoek-Brown rock mass strength is:

[0118] In the formula: σ′ 3 is the minimum principal stress when the rock mass fails, MPa; σ ci is the uniaxial compressive strength of the rock block, MPa; is the material constant m i The discounted value of m i It reflects the softness and hardness of the rock, and its value ranges from...

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Abstract

The application provides a method and a device for predicting rock burst in a tunnel, and a storage medium and a system. The method includes the steps of: acquiring Hoek-Brown rock mass strength of surrounding rocks at a to-be-tested depth and the maximum ground stress of an in-situ stress field in the direction being vertical to tunnel axis; calculating a predicted index of rock burst, wherein the threshold value of the predicted index of rock burst is the ratio of the Hoek-Brown rock mass strength to the maximum ground stress of the in-situ stress field in the direction being vertical to tunnel axis; and predicting rock burst level according to the threshold value of the predicted index of the rock burst.

Description

technical field [0001] The present disclosure generally relates to the technical field of underground engineering construction, and in particular relates to a tunnel rockburst prediction method, device, storage medium and system. Background technique [0002] Rockburst is a kind of sudden disaster that is prone to occur in deep brittle, high-hard rock, and structurally developed tunnels. When the mechanical equilibrium state is destroyed, the rock mass variable energy is released suddenly, sharply, and violently. A special dynamic instability phenomenon. The occurrence of rockburst directly threatens the safety of equipment and personnel during TBM construction. How to reasonably and timely predict the grade of rockburst during the construction process has very important and necessary guiding significance for adjusting the support design, ensuring the safety of construction personnel, and rationally arranging the construction progress. [0003] Rockburst research can be tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019G01N2203/0256
Inventor 陈卫忠谭贤君杨建平田洪铭赵武胜马池帅邹俊鹏
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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