首页|Mechanical responses and fracturing behaviors of coal under complex normal and shear stresses,Part Ⅱ:Numerical study using DEM
Mechanical responses and fracturing behaviors of coal under complex normal and shear stresses,Part Ⅱ:Numerical study using DEM
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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.
Coal mineDEMCyclic loadFailure mechanismb-value
Z.Y.Song、F.Amann、W.G.Dang、Z.Yang
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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,China
School of Civil Engineering,Sun Yat-Sen University,Zhuhai 519082,China
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