Numerical simulation of a failure pattern of the roof in coal seam working face-Reference-Cited by-同舟云学术

Numerical simulation of a failure pattern of the roof in coal seam working face

Published:2024 Issue:2 Part A Volume:28 Page:1149-1154
ISSN:0354-9836
Container-title:Thermal Science
language:en
Short-container-title:Therm sci

Author:

Zhang Xiu-Feng¹,Zhang Ning²,Li Xiang³,Liu Chuan-Cheng¹,Chen Yang¹

Affiliation:

1. Shandong Energy Group, Jinan, Shandong Province, China

2. State Key Laboratory for Geo-Mechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, China

3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, China

Abstract

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.

Publisher

National Library of Serbia

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