Mechanical responses and fracturing behaviors of coal under complex normal and shear stresses,Part Ⅱ:Numerical study using DEM
Z.Y.Song1
F.Amann2
W.G.Dang3
Z.Yang4
1.State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing,China;Chair of Engineering Geology and Hydrogeology,RWTH Aachen University,52056 Aachen,Germany;Department of Civil Engineering,University of Science and Technology Beijing,Beijing 100083,China2.Chair of Engineering Geology and Hydrogeology,RWTH Aachen University,52056 Aachen,Germany3.School of Civil Engineering,Sun Yat-Sen University,Zhuhai 519082,China4.Department of Civil Engineering,University of Science and Technology Beijing,Beijing 100083,China
摘要：This work presents particle-based numerical simulations on coal pillars in a coal mine based underground water reservoir(CMUWR).We aim to replicate the stress-strain characteristics and present the acoustic emission behavior of the coal under complex dynamic stress paths.The study reveals failure characteristics of coal exposed to monotonic/cyclic shear load under constant/cyclic normal loads.Based on the evolution of stress-time-dependent bond diameter implemented in particle model,different damage paths are established for dry and water-immersed samples under two loading frequencies.Furthermore,the numerical Gutenberg-Richter's b-value was calculated from the released energy emanating from bond failure,and this work presents the evolution of numerical Gutenberg-Richter's b-value.The numerical simulation contributes to a micromechani-cal understanding of the failure mechanisms of coal under water-immersion and cyclic stress,providing valuable insights for strength prediction of CMUWR.
机标关键词：normalstudypartbehaviorscoalcomplexfracturingmechanical
论文发表日期：2024-08-28
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：26( 59-84 )
英文信息