DOI: 10.11799/ce202506013
Dynamic pressure behaviors and roof disaster mechanism under continuous mining of large mining height working face
DU Wei
WANG Xiaojun
LI Chengdong
JI Xinwei
GUO Jiahao
LIU Qianjin
LI Zhen
Abstract：Focusing on the dynamic pressure behaviors and roof disaster mechanisms under continuous mining of large mining height working faces,the typical case of roof caving in the 2-2 coal seam at the Xiaobaodang Coal Mine was used as the background.The support resistance and the strong dynamic pressure before and after abnormal pressure were analyzed.On this basis,through a comprehensive approach including deposition analysis,numerical simulation,microseismic monitoring,model testing,and field investigation,the mechanism was revealed.The results show that the dynamic pressure behavior is more pronounced on the tail side,with continuous pressure appearing before the dynamic pressure behavior,possibly accompanied by a relatively calm period,and the weighting in gob-side working face is intensive and wide-ranged.The rock layer structure indicates lateral alternation and rapid changes in lithology and rock layer thickness,with multiple thick hard rock layers and thin unstable roof layers developing simultaneously in the vertical direction.The damage zone spans multiple working faces,showing synchronous damage and fracture characteristics at different roof levels.Strong dynamic pressure is concentrated at the tail,with damage and stress growth more pronounced on the unsupported side,displaying unevenness and differences.The thick hard roof structure in the goaf can be reactivated and fractured,leading to microseismic events,roof dynamic loads,and subsidence of high-level strata.
Keywords：dynamic pressure behaviourroof hazardsmine pressuredamage evolutionhazard mechanism
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 96-105 )