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Numerical modeling of the failure process of the heterogeneous karst rock mass using the DDA-SPH method

Underground Space 2023年第6期13卷 1-22页

作者： Jingyao Gao Guangqi Chen Zhijie Wang Liping Li Yasuhiro Mitani Changze Li Hongyun Fan Xinyan Peng Yifan Jiang Department of Civil and Structural Engineering Kyushu UniversityFukuoka 819-0395Japan School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610065China School of Qilu Transportation Shandong UniversityJinanShandong 250000China MOE Key Laboratory of Deep Earth Science and Engineering Institute for Disaster Management and ReconstructionSichuan UniversityChengdu 610031China

The sanding process caused by karstification in dolomite creates a special sandy dolomite stratum,where the frequent catastrophic instability of the surrounding rock occurred during tunnel *** this study,the micro-origin and macro-performance of the sandy dolomite stratum are first ***,a numerical model based on the coupling method between the discontinuous deformation analysis and smoothed particle hydrodynamics is proposed to depict the heterogeneous dolomite formation with different sanding ***,the mechanical behaviors of the heterogeneous dolomite samples under uniaxial compression are studied after calibrating the numerical parameters with the two single materials sampled from the tunnel site ***,the instability disasters of the dolomite surrounding rock with different sanding degrees are reproduced,and the failure behaviors of tunnels are explained with respect to the stress distribution and plastic *** obtained results show that the rotation and dislocation of the remained dolomite block contribute to the unsmooth stress–strain curve and deterioration in uniaxial compressive ***,the block serves as the skeleton in the transmission of field stress in underground space,which improves the stability of the formation.

关键词： Karst sanding effect DDA-SPH method uniaxial compressive test Tunnel excavation Failure process

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