西安科技大学学报2025，Vol.45Issue(4)：639-649,11.DOI:10.13800/j.cnki.xakjdxxb.2025.0401
浅埋工作面过沟开采覆岩裂隙发育规律及来压机理
Overburden fracture development law and weighting mechanism in shallow coal face gully-crossing mining
摘要
Abstract
In order to reduce the occurrence of support crushing and water inrush accidents during gul-ly-crossing mining in shallow coal seam,this study took the gully-crossing mining of a working face in a certain coal mine as the research background,the method of combining physical similarity simulation,numerical calculation and theoretical analysis was used to study the roof weighting law,change law of front abutment pressure and the overburden fracture development law.The structural model of upper cantilever-lower step voussoir beam was established,which reveals the mechanism of strong weighting at the top of reverse slope in gully-crossing mining.The results show that:During the gully-crossing min-ing,the periodic weighting interval distance changes little.During the roof weighting period,the average load of the support has a characteristic of stages,which is presented as reverse slope stage＞along slope stage＞gully bottom stage.When the working face advances the top of the reverse slope stage 22 m,the overburden presents a large breaking movement and rotation subsidence of cantilever beam structure,resulting in strong weighting.The front abutment pressure of the working face is affected by the gully terrain,which is proportional to the thickness of the overburden.During the gully-crossing period,the width of surface cracks increases first,then decreases and finally closes gradually with the advance of working face and the rotation of overburden.When mining to the top of the reverse slope,there are ad-vanced cracks in front of the coal wall.The cracks in the gully bottom mining stage are vertically devel-oped to the surface,forming a penetrating surface crack,and the maximum width is 10 cm.The theoret-ical calculation results of support load at the moment of strong weighting are consistent with the physi-cal simulation results.This study provides a scientific basis for the prevention and control of strong weighting at the reverse slope top and water inrush and roof collapse disasters at the gully bottom dur-ing gully-crossing mining in shallow coal seams.关键词
浅埋煤层/沟谷区域/覆岩垮落/来压机理/裂隙发育Key words
shallow coal seam/gully area/overburden caving/weighting mechanism/fracture develop-ment分类
矿业与冶金引用本文复制引用
黄庆享,张东杰,韦业豪,贺雁鹏,张富魁..浅埋工作面过沟开采覆岩裂隙发育规律及来压机理[J].西安科技大学学报,2025,45(4):639-649,11.基金项目
国家自然科学基金项目(52074211) （52074211）
