Yuanchao Zhang1, Zhiyuan Xia2,*, Yujing Jiang1, Miao Chen3, Jiankang Liu1, Qian Yin4
CMES-Computer Modeling in Engineering & Sciences, Vol.125, No.1, pp. 259-280, 2020, DOI:10.32604/cmes.2020.011076
Abstract Hole-like defects are very common in natural rock or coal mass, and
play an important role in the failure and mechanical behaviors of rock or coal
mass. In this research, multi-holed coal specimens are constructed numerically
and calibrated based on UDEC-GBM models. Then, the strength, deformation
and failure behavior of the porous specimens are analyzed, with consideration
of hole density (P) and confining pressure (σ3). The simulation results are highly
consistent with those available experiment results, and show that the compressive
strength decreases exponentially with the increasing hole density. The strength
loss is mainly caused by the reduction of cohesion… More >
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