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A monitoring and early warning method for rockburst hazard based on dynamic and static combined stress analysis

A technology of rock burst and combined stress, which is applied in earthwork drilling, mining equipment, mining equipment, etc., can solve the problems of quantitative description of the danger degree of rock burst dangerous areas and scientific means of mining information sources, etc.

Active Publication Date: 2021-05-07
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

[0007] However, in the above-mentioned prior art, it is impossible to calculate the rock burst risk comprehensive index of the influencing factors on the rock burst risk or to input the monitored parameters into the computer for comprehensive analysis, and it is impossible to realize the identification of the rock burst dangerous area and its dangerous degree. Quantitative description, and then achieve the purpose of precise early warning, and how to use existing monitoring methods to quantify and determine the two effects of dynamic and static loads in the induced mechanism of rock burst and their superposition, is the key to realizing accurate early warning of rock burst and its results The key to quantification; in addition, it is difficult for coal mine technicians to effectively use scientific means to mine essential and useful information sources in the face of multi-source and massive monitoring data

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  • A monitoring and early warning method for rockburst hazard based on dynamic and static combined stress analysis
  • A monitoring and early warning method for rockburst hazard based on dynamic and static combined stress analysis
  • A monitoring and early warning method for rockburst hazard based on dynamic and static combined stress analysis

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[0052] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0053] The stress field disturbance caused by the excavation of the underground coal mass forms a stress concentration area exceeding the stress of the original rock in the lateral direction in the front of the working face and in the coal mass around the roadway, that is, the support stress area. Simultaneous excavation causes overlying rock damage and migration, such as figure 1 As shown, the collapse zone, crack zone and bending subsidence zone are formed in the longitudinal direction, and correspond to the post-peak failure zone DE, pre-peak plastic zone BD and elastic zone AB in the transverse bearing stress zone, respectively.

[0054] Under...

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Abstract

The invention discloses a monitoring and early warning method for rock burst risk based on dynamic and static combined stress analysis, which is based on the superposition of dynamic load effect and static load effect to induce rock burst mechanism, and combined with dynamic and static combined effects to monitor and early warning of rock burst risk; dynamic and static Combination effect By separately determining the dynamic load effect parameters of shock wave attenuation cumulative reconstruction, the static load effect parameters of shock wave CT inversion and the static load effect parameters of microseismic damage reconstruction parameter weights, the dynamic and static combined stress is calculated using the weighted average method The final dangerous area and its dangerous degree are comprehensively determined in combination with the dynamic load stress coefficient of the instantaneous dynamic load stress increment of mine pressure. It has the advantages of clear calculation model, universal applicability and strong operability, and can realize the quantitative analysis of rock burst dangerous area and its dangerous degree prediction, and has good application feasibility.

Description

technical field [0001] The invention relates to a rock burst risk monitoring and early warning method based on dynamic and static combined stress analysis. Background technique [0002] Rockburst, also known as rockburst, refers to the phenomenon of sudden failure in the surrounding rock mass in the deep part of the underground mining or in areas with high structural stress. It is the energy accumulated in the roadway and the coal rock mass of the stope. Under the disturbance of mine vibration load, it is released suddenly, throwing the coal and rock mass to the roadway, and at the same time, a strong sound occurs, causing dynamic phenomena such as vibration and destruction of the coal and rock mass, damage to supports and equipment, casualties, and damage to some roadways. [0003] According to long-term theoretical research, laboratory tests, and field tests, it is agreed that the occurrence of rock burst satisfies the induction principle of superposition of dynamic and st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F17/00E21F17/18
CPCE21F17/00E21F17/18
Inventor 蔡武曹安业窦林名巩思园何江贺虎王桂峰袁莎莎葛庆
Owner CHINA UNIV OF MINING & TECH
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