Numerical analysis on the factors affecting post-peak characteristics of coal under uniaxial compression  

作　　者：Zhiguo Lu Wenjun Ju Fuqiang Gao Taotao Du 

机构地区：[1]CCTEG Coal Mining Research Institute,Beijing,China [2]State Key Laboratory of Coal Intelligent Mining and Strata Control(China Coal Research Institute),Beijing,China

出　　处：《International Journal of Coal Science & Technology》2024年第1期42-60,共19页国际煤炭科学技术学报（英文）

基　　金：National NaturalScience Foundation of China(52074151,52274085,52274123);Tiandi Science and Technology Co.,Ltd.Science and Technology Innovation Venture Capital Special Project(TDKC-2022-MS-01,TDKC-2022-QN-01,TDKC-2022-QN-02).

摘　　要：The post-peak characteristics of coal serve as a direct reflection of its failure process and are essential parameters for evaluating brittleness and bursting liability.Understanding the significant factors that influence post-peak characteristics can offer valuable insights for the prevention of coal bursts.In this study,the Synthetic Rock Mass method is employed to establish a numerical model,and the factors affecting coal post-peak characteristics are analyzed from four perspectives:coal matrix mechanical parameters,structural weak surface properties,height-to-width ratio,and loading rate.The research identifies four significant influencing factors:deformation modulus,density of discrete fracture networks,height-to-width ratio,and loading rate.The response and sensitivity of post-peak characteristics to single-factor and multi-factor interactions are assessed.The result suggested that feasible prevention and control measures for coal bursts can be formulated through four approaches:weakening the mechanical properties of coal pillars,increasing the number of structural weak surfaces in coal pillars,reducing the width of coal pillars,and optimizing mining and excavation speed.The efficacy of measures aimed at weakening the mechanical properties of coal is successfully demonstrated through a case study on coal burst prevention using large-diameter borehole drilling.

关 键 词：Post-peak behavior Synthetic rock mass Coal bursts Coal burst prevention 

分 类 号：TD315[矿业工程—矿井建设]