@Article{cmes.2020.011076,
AUTHOR = {Yuanchao Zhang, Zhiyuan Xia, Yujing Jiang, Miao Chen, Jiankang Liu, Qian Yin},
TITLE = {Effect of Hole Density and Confining Pressure on Mechanical Behavior of Porous Specimens: An Insight from Discrete Element Modeling},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {125},
YEAR = {2020},
NUMBER = {1},
PAGES = {259--280},
URL = {http://www.techscience.com/CMES/v125n1/40216},
ISSN = {1526-1506},
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 when P < Pcr (critical hole density) and the reduction of frictional angle when P > Pcr. Also, the increasing hole
density linearly reduces the tangent and secant modulus and causes greater nonlinear deformation of multi-holed specimens. Finally, the failure patterns, coalescence mechanism and damage behavior of the multi-holed specimens are revealed
based on the analysis of mesoscopic displacement fields and stress distribution
around holes. This research promotes a better understanding of the effects of hole
density and confining pressure on the failure and mechanical behavior of porous
geomaterials.},
DOI = {10.32604/cmes.2020.011076}
}