TY - JOUR
TI - Research on stress evolution law and failure characteristics of top coal in fully mechanized caving of extra-thick coal seams
AU - Li Hong-Bin
AU - Li Dong-Yin
AU - Wang Hao
AU - Li Zhen-Feng
AU - Wang Shen
AU - Chen Chun-Ling
JN - Thermal Science
PY - 2023
VL - 27
IS - 1
SP - 687
EP - 695
PT - Article
AB - In this study, based on the engineering background of the No. 8222 working  face of the Tashan coal mine in Shanxi Province, China, true triaxial  experiments were carried out on Geotechnical Consulting and Testing Systems  rock mechanics testing machine using cubic coal samples, and the numerical  simulation was conducted through the FLAC3D software. Moreover, the stress  evolution law of different layers of extra-thick coal seams and the failure  mechanism of top coal in the fully mechanized caving were investigated, and  the failure structure model of top coal was established. The results show  that there are differences in the principal stress values at different  layers of the top coal.