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Modeling shale with consideration of bedding planes by cohesive finite element method 被引量:2

Modeling shale with consideration of bedding planes by cohesive finite element method
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摘要 Shale contains distributed directional bedding planes,which make the shale transverse isotropic.To model shale with consideration of the bedding planes,a cohesive finite element method(CFEM)is developed based on the randomized triangular mesh.The interface orientation generated from such mesh tends to be uniformly distributed with the element number increasing.To represent the bedding plane,the interfaces aligned with the bedding plane are assigned the cohesive law that characterizes the bedding plane while the other interfaces are assigned the cohesive law that characterizes the matrix.By this means,the anisotropy characteristics of the stiffness and the strength of shale are well represented.The simulation examples demonstrate that the bedding plane has a significant influence on the fracture trajectory,which is consistent with the observation in the experiment.It is suggested that this modeling method of shale is feasible.It provides an alternative approach to fracture simulation in shale. Shale contains distributed directional bedding planes, which make the shale transverse isotropic.To model shale with consideration of the bedding planes, a cohesive finite element method(CFEM) is developed based on the randomized triangular mesh. The interface orientation generated from such mesh tends to be uniformly distributed with the element number increasing.To represent the bedding plane, the interfaces aligned with the bedding plane are assigned the cohesive law that characterizes the bedding plane while the other interfaces are assigned the cohesive law that characterizes the matrix. By this means, the anisotropy characteristics of the stiffness and the strength of shale are well represented. The simulation examples demonstrate that the bedding plane has a significant influence on the fracture trajectory, which is consistent with the observation in the experiment. It is suggested that this modeling method of shale is feasible. It provides an alternative approach to fracture simulation in shale.
出处 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2019年第6期397-402,共6页 力学快报(英文版)
基金 supported by the National Natural Science Foundation of China(No.11772190)
关键词 SHALE BEDDING plane COHESIVE finite element TRANSVERSE ISOTROPY Fracture simulation Shale Bedding plane Cohesive finite element Transverse isotropy Fracture simulation
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