The role of fracture in dynamic tensile responses of fractured rock mass:Insight from a particle-based model
Changtai Zhou1
Yichao Rui2
Jiadong Qiu3
Zhihe Wang4
Tao Zhou5
Xiting Long5
Ke Shan6
1.Department of Architecture and Civil Engineering,City University of Hong Kong,Tat Chee Avenue,Kowloon 999077,Hong Kong,China;Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China2.School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China3.School of Resources Environment and Safety Engineering,University of South China,Hengyang 421001,China;Xinjiang Xuefeng Sci-Tech(Group)Co.,Ltd.,Urumqi 830026,China4.School of Chemical Engineering,The University of Adelaide,Adelaide 5005,Australia5.Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China6.Shenzhen Gas Corporation Ltd.,Shenzhen 518049,Guangdong,China
摘要：The fractured rock mass inherently exhibits uncertainty due to the presence of pre-existing discontinuities.In this study,a particle-based model incorporating the discrete fracture network(DFN)to elucidate the dynamic tensile responses and asso-ciated uncertainty of rock mass.At first,the particle-based model was used synthesize the intact rock and split Hopkinson pressure bar(SHPB)system,while the fractures were represented using the smooth fracture model(SJM).Subsequently,the samples of the fractured rock mass with varying joint geometrical configurations were conducted the dynamic tensile test using the numerical SHPB system.The simulated results demonstrate a gradual decrease in dynamic tensile strength(TS)with increasing fracture intensity and fracture length,which can be effectively described by nonlinear exponential func-tions.Additionally,the fracture orientation significantly influences the dynamic TS,however,the anisotropic characteristics gradually diminish as the deviation angle approaches 90°.Furthermore,as fracture intensity and fracture length increase,the dynamic TS variability also rises steadily.However,no noticeable pattern is seen when considering cases with varying fracture orientations.When subjected to SHPB loading,the fractured rock mass primarily exhibits a combined tensile-shear failure mode,contrasting with the pure tensile failure mode exhibited by the intact rock.These findings contribute signifi-cantly to comprehending the dynamic tensile responses of the fractured rock mass and can further enhance the stability analysis of in-situ rock engineering.
机标关键词：insightdynamicrolemodelrockmassfromfractured
论文发表日期：2025-06-30
在线出版日期：2025-10-15（本平台首次上网日期，不代表文献的发表时间）
页数：19( 137-155 )
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