Impact Analysis of the Open Type Crack Characteristics of Coal and Rock Burst

2018 International Conference on Air Pollution and Environmental Engineering

生态环境科学

Niu, Xingang^1,2

National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing, China^1

Chongqing Research Institute of China Coal Technology and Engineering Group, Chongqing, China^2

关键词: Compressive state;    Failure characteristics;    Fracture mechanics analysis;    Lateral pressure coefficient;    Numerical simulation software;    Opening-mode cracks;    Radius of curvature;    the stress of initiation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/208/1/012031/pdf
DOI  :  10.1088/1755-1315/208/1/012031

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Under the compression state in order to obtain mode open crack behavior of coal and rock burst, based on fracture mechanics analysis of crack open type crack pattern, the study of open type crack crack characteristics, using RFPA numerical simulation software simulation with different open type crack geometry parameters of coal and rock strength and failure characteristics. The research results show that the geometric parameters and load effect on crack open type crack law, the radius of curvature, the greater the Angle of the open type crack in the closer it gets to the DHS 40 ∼ 60 DHS, the longer the length, lateral pressure coefficient is smaller, the smaller the crack stress, coal and rock will be easy to burst;Coal and rock strength increases with the increase of content of open type crack length decreases sharply, along with the increase of crack Angle contained present the change trend of increase with the decrease of the first.