Overall impact mechanism of isolated coal in deep topsoil fully mechanized caving face
PAN Xiaozheng
ZHENG Hongwei
KONG Zhen
ZHOU Guangfei
YU Chunyu
GAO Xu
SONG Shuhao
FANG Lue
Abstract：In view of the frequent occurrence of high-energy microseismic events in isolated coal bodies in 7303 working face of Zhaolou Coal Mine,the overall instability impact mechanism of isolated coal bodies in fully mechanized top-coal caving face with deep topsoil was studied by means of numerical simulation,theoretical analysis and industrial test,and the following conclusions were drawn:the e-volution law of stratum spatial structure in fully mechanized top-coal caving face with deep topsoil was discussed,the estimation model of fully mining abutment pressure in fully mechanized top-coal caving face with deep topsoil was established,and the instability criterion of overall impact of isolated coal bodies in fully mechanized top-coal caving face with deep topsoil was deduced.The overall impact mechanism of isolated coal body in fully mechanized top-coal caving face with deep overburden is re-vealed:the high level of supporting pressure of surrounding rock of the face comes from the primary soil arch structure in the state of quasi-full mining,and the stress concentration of surrounding rock is increased after the superposition of stratum self-weight and structural stress,and at the same time,the roadway cuts the surrounding rock of the face to form a high-stress isolated coal body.When the bearing stress in the elastic core area exceeds its failure threshold,the isolated coal body will have an overall unstable rock burst.
Keywords：isolated coaldeep topsoilstratigraphic structureclass critical miningoverall instability
Publication Date：2025-10-01
Online Publishing Date：2025-09-22(First online date of this platform, not the publication date of the document)
Pages：6( 62-67 )