Open AccessNumerical simulation on fracturing behaviour of hard roofs at different levels during extra-thick coal seam mining
Author(s) -
Rui Gao,
Bingjie Huo,
Hongchun Xia,
Xiuxia Meng
Publication year - 2020
Publication title -
royal society open science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 51
ISSN - 2054-5703
DOI - 10.1098/rsos.191383
Subject(s) - roof , overburden , breakage , mining engineering , hard coal , coal mining , geotechnical engineering , overburden pressure , geology , coal , computer simulation , finite element method , structural engineering , engineering , materials science , simulation , waste management , composite material
In fully mechanized caving mining of extra-thick coal seams, the movement range of overburden is wide, resulting in the breakage of multilayer hard roofs in overlying large spaces. However, the characteristics, morphology and impact effect of hard roofs at different levels are different and unclear. In this study, a secondary development was used in the numerical simulation software ABAQUS, and the caving of rock strata in the finite-element software was realized. The bearing stress distribution, fracturing morphology and impact energy characteristics of hard roofs at different levels were studied to reflect the action and difference of hard roof failure on the working face; thus, revealing the mechanism of the strong ground pressure in stopes, and providing a theoretical basis for the safe and efficient mining of extra-thick coal seams with hard roofs.