Numerical analysis on the factors affecting post-peak characteristics of coal under uniaxial compression
Zhiguo Lu
Wenjun Ju
Fuqiang Gao
Taotao Du
CCTEG Coal Mining Research Institute,Beijing,China;State Key Laboratory of Coal Intelligent Mining and Strata Control(China Coal Research Institute),Beijing,China
摘要：The post-peak characteristics of coal serve as a direct reflection of its failure process and are essential parameters for evaluat-ing 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.
机标关键词：characteristicsanalysisaffectingcoalcompressionfactorsnumericalpost-peak
论文发表日期：2024-02-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：19( 42-60 )
英文信息