TY - JOUR
TI - Numerical simulation of a failure pattern of the roof in coal seam working face
AU - Zhang Xiu-Feng
AU - Zhang Ning
AU - Li Xiang
AU - Liu Chuan-Cheng
AU - Chen Yang
JN - Thermal Science
PY - 2024
VL - 28
IS - 2
SP - 1149
EP - 1154
PT - Article
AB - This study adopts the cohesive element technology for the first time to  analyze the dynamic evolution process of crack formation and propagation,  and to clarify the mechanical mechanism of the "O-X" failure pattern in the  roof. The mechanical behavior of cohesive failure inside the rock is  simulated based on the maximum nominal stress criterion, and the  Benzeggagh-Kenane (BK) fracture criterion is used to further describe the  dependence of fracture energy on the combination of mixed tensile-shear  mode. The results show that the "O"-shaped crack is formed on the top  surface of the roof, and delamination occurs along the thickness direction,  which coincides with the crack bifurcation position on the bottom surface of  the roof. The "cross"-shaped crack forms on the center of the bottom surface  of the roof, and extends towards the four corners at the bifurcation  position to form a spatial "X"-shaped crack.