煤矿安全2024，Vol.55Issue(5)：35-50,16.DOI:10.13347/j.cnki.mkaq.20240247
营盘壕煤矿深部多煤层开采地表移动变形规律及最优错距研究
Strata movement law and stress distribution characteristics of deep multi-coal seam mining in Yingpanhao Coal Mine
摘要
Abstract
The Dongsheng Coalfield in Ordos is a Jurassic coal bearing formation,and the 2-2 and 3-1 coal seams in many deep min-ing areas can be mined in the whole area,and the spacing of coal seams is small.This paper takes Yingpanhao Coal Mine as a geolo-gical prototype,and constructs a numerical model of the research area through FLAC3D and UDEC numerical simulation software to study the surface movement deformation and the evolution law of stress field caused by mining coal seams 2-2 and 3-1.The results show that repeated mining in multiple coal seams will cause the central projection of the subsidence basin to move toward the direc-tion of lower coal seam,and then approach the central projection of the initial mining of the upper coal seam,and ultimately cross it;after the two coal seams were continuously mined,the maximum subsidence value of the surface is less than the sum of the maxim-um subsidence values caused by mining the two coal seams separately,and the subsidence coefficient of the coal seam repeated min-ing is less than the initial mining subsidence coefficient;coal pillar dislocation is closely related to surface movement parameters,the staggered coefficient is related to the surface subsidence coefficient,horizontal movement coefficient,and the tangent of the main in-fluencing angle in a logarithmic normal function,concave parabolic function,and convex parabolic function,respectively;as com-mon factors,pillar staggered distance and width-depth ratio have coupling effects on the ratio of characteristic parameters of primary mining and repeated mining in coal seam;in addition,with the increase of pillar staggered distance,the surface subsidence basin area decreases first and then increases,and the contours of horizontal movement near the basin evolve from ellipse to shuttle;the optimal staggered distance of multi-coal seam mining in this study area is 30 m based on the empirical formula of pressure relief distance,the surface damage degree and the relief effect of staggered mining.关键词
开采沉陷/地表变形/巨厚弱胶结覆岩/深部开采/错距开采/地表移动/煤柱卸压Key words
mining subsidence/surface deformation/super thick and weak cementation overburden/deep mining/staggered dis-tance mining/surface movement/rock movement/coal pillar stress unloading分类
矿业与冶金引用本文复制引用
张国建,付连龙,郭广礼,卫伟,高鑫,李怀展,郭庆彪,杨向升..营盘壕煤矿深部多煤层开采地表移动变形规律及最优错距研究[J].煤矿安全,2024,55(5):35-50,16.基金项目
国家自然科学基金青年科学基金资助项目(52204097) （52204097）
国家自然科学基金面上资助项目(42374049) （42374049）
