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《Chinese Journal of Underground Space and Engineering》 2009-01
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Numerical Studies of Crack Propagation in Free Boundary Shape under Uniaxial Compression

FANG En-quan1,2,CAI Yong-chang1,2,ZHU He-hua1,2(1.Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)  
For rock samples at uniaxial compression test,its failure forms include friction slippage,self-analogue plane expansion and crankle expansion of micro-cracks.Based on the fracture mechanism,rock models with pre-existing inclined flaw situated close to the boundary are studied by explicit finite element type simulation using FLAC,considering three different boundary shapes,i.e.rectilinear,convex and concave.The result shows that the fracture pattern of crack growth based on "interface" element is a "Z" wing crack,which describes the process of crack propagation well.The stress for crack initiation and the process of crack propagation close to the boundary are strongly affected by the inclined angle of the pre-existing flaw and the boundary shapes.Besides,the model of crack growth close to the concave boundary is very stable compared with the rectilinear and convex,where is no unstable crack growth.There exists a phenomenon in the rectilinear and convex model,in which crack growth proceeds from stable to unstable gradually.
【Fund】: 教育部科学技术研究重点项目(107041)资助;; 国家自然科学基金资助(40672184)
【CateGory Index】: TU452
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