ZHANG W H, PAN P Z, MA D Q,et al.Influence of initial roof damage on destructive state and energy evolution of coal-rock mass[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):22-33.

doi:10.16186/j.cnki.1673-9787.2022010061

Received:2022/01/20

Revised:2022/08/31

Published:2023/07/25

Influence of initial roof damage on destructive state and energy evolution of coal-rock mass

ZHANG Wenhai1,2, PAN Pengzhi1, MA Deqin2,3, WU Zhenhua1

1.Institute of Rock and Soil Mechanics of Wuhan，Chinese Academy of Sciences，Wuhan  430071，Hubei，China;2.College of Engineering，Tibet University，Lhasa 850000，Xizang，China;3.School of Earth Science and Environmental Engineering，Southwest Jiaotong University，Chengdu  610031，Sichuan，China

Abstract:Through the numerical test of uniaxial compression failure process of coal and rock mass by using CASRock，the influence of initial damage of roof containing cracks on mechanical behavior of coal seam was analyzed.The results showed that：（1）The initial damage degree of the impact on the mechanical behavior of coal seam roof and the roof of the initial crack was closely related to the geometric distribution，with the increase of fractures and the horizontal angle，the coal and rock assemblages from the ductile fracture to brittle failure，under the condition of the same fracture dip，with the increase of crack length，assembly from the brittle fracture to ductile fracture，The smaller the angle between the fracture and the horizontal plane，the longer the length，and the closer the distance to the coal seam，the greater the influence on the mechanical behavior of the combination，the more dominant the mechanical behavior of the combination，and the less likely the coal seam was to be destroyed；（2）The mechanical behavior of coal and rock mass dominated by cracks was stronger when the roof contained multiple cracks； When the initial damage of the roof was serious，the initial fracture network would form a stress concentration area，leading to its strong influence on the mechanical behavior of the composite body；（3）Under the condition of uniaxial compression，fracturing was the main damage form of roof combination of initial damage on strength and deformation ability of ascension effect was stronger，when the roof fracture with combination had a greater influence on the mechanical behavior，but not dominated the combination mechanical behavior，its release can effect was good，roof initial damage enhanced the protective effect of coal seam to a certain extent.

Key words:initial roof damage;uniaxial compression;coalburst;coal-rock mass;CASRock

顶板初始损伤对煤岩组合体破坏性态及能量演化的影响_张文海.pdf