陕西煤炭2026，Vol.45Issue(1)：1-6,6.DOI:10.20120/j.cnki.issn.1671-749x.2026.0101
复采工作面过空巷群顶板稳定性分析
Analysis on roof stability of gob-crossing roadway group in re-mining face
摘要
Abstract
Based on the urgent engineering needs of efficient recovery of coal mine resources and long-term safe and stable production of mines,the problems faced by the re-mining face under complex geological conditions have become more and more serious.In this paper,for the stability of the roof of the cross-gob roadway group of the re-mining face,FLAC3D simula-tion was used to reproduce the process of the re-mining face advancing through the over-gob roadway group,and the chan-ging law of the stress and plastic zone of the roof of the face was investigated,the influence of the pre-filling rate of the gob roadway on the maximum overhanging roof length of the roof of the face was analyzed,and the mechanical mechanism of the over-excessive fracture of the basic roof of the over-gob roadway group of the re-mining face was explored.The study shows that:When the distance of the re-mining face from the gob roadway group advances from 100 m to 0 m,the surrounding rock pressure will be transferred to the coal pillars on both sides of the gob roadway group and lead to the phenomenon of stress concentration,the stress concentration coefficient increases from 1.81 to 2.18,which affects the fracture step of the basic roof and the characteristics of the pressure,and the step of the pressure of the re-mining face is about 12～25 m.With the advancement of the working face,the working face roof plastic zone gradually extends to the pre-filling gob roadway group,resulting in a high rate of deformation of the surrounding rock.The plastic zone of the surrounding rock on both sides of the pre-filling gob roadway is distributed in the shape of"X",which leads to the reduction of elastic support area and the high speed growth of deformation of the surrounding rock.When the pre-filling rate of the gob roadway is 0%,86.4%and 100%,the step distance between the working face and the last collapse of the roof plate is 36 m,26 m and 15 m,respective-ly.When the width of the coal pillar of the gob roadway group is less than the critical value,it is easy to lead to the restora-tion of the roof of the mining face to be unstable and the length of the cantilever increases suddenly,and the fixed end's shear force and bending moment increase,leading to the advanced fracture of basic roof.关键词
复采工作面/空巷群/顶板稳定性/数值模拟/预充填率Key words
re-mining face/gob roadway group/roof stability/numerical simulation/pre-filling rate分类
矿业与冶金引用本文复制引用
WANG Liyang,GAO Shuai,WANG Xin..复采工作面过空巷群顶板稳定性分析[J].陕西煤炭,2026,45(1):1-6,6.基金项目
国家自然科学基金(52374087) （52374087）
深地工程智能建造与健康运维全国重点实验室开放基金(SDGK2410) （SDGK2410）
