急倾斜煤层开采与开拓巷硐群扰动效应数值模拟分析  

Numerical simulation analysis of disturbance effect of roadway group in mining and development of steeply inclined coal seam

作　　者：田兴智 张彪 常庆粮[2,3] TIAN Xingzhi;ZHANG Biao;CHANG Qingliang(Ningxia Baofeng Group Co.,Ltd.,Hongsi Coal Industry,Yinchuan 750000,China;Key Laboratory of Deep Coal Resource Mining,Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]宁夏宝丰能源集团股份有限公司红四煤业,宁夏银川750000 [2]中国矿业大学深部煤炭资源开采教育部重点实验室,江苏徐州221116 [3]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《中国矿业》2021年第S02期234-240,共7页China Mining Magazine

基　　金：国家自然科学基金面上项目资助(编号:52074270)。

摘　　要：针对西北地区某矿急倾斜煤层开采与开拓巷硐群工程越界对地方煤矿安全开采的问题,建立了急倾斜煤层开采与开拓巷硐群数值计算模型,分析了覆岩移动变形与应力演化规律。结果表明,急倾斜煤层开采,采空区上方煤层先破坏、垮落,顶板沿层理面法向发生弯曲、离层,采空区上部煤体先垮落,呈拱形结构,抑制了上覆煤岩体向采空区的垮落和移动;工作面采高5.2 m,顶板发生垮落,底板也会发生滑移,顶板一侧的沉陷大于底板一侧,在底板一侧出现断崖式现象,但垮落带发育高度小于工作面距井田边界的距离;巷硐群最大位移均发生在泥岩、煤层等软弱岩层以及断层破碎带区域,其扰动效应增加;在软弱岩层巷道最大影响圈边界增加,影响边界贯通,但最大裂隙带高度为11.5 m,裂隙带上脚未发育至井田边界标高。由此可知,工作面开采与开拓巷硐群对地方煤矿安全开采没有影响。Aiming at the problem of safe mining of local coal mines due to the crossing of the mining and development roadway group project of steep coal seam in a mine in northwest China,the numerical calculation model of mining and development roadway group of steep coal seam is established,and the laws of overburden movement,deformation and stress evolution are analyzed.The results show that the coal seams above the goaf are destroyed and collapsed firstwhen mining steep coal seams,the roof bends and separates along the normal direction of bedding plane,and the upper coal body of the goaf collapses first,showing an arch structure,which inhibits the collapse and movement of the overlying coal and rock mass to the goaf.The mining height of the working face is 5.2 m,the roof collapses and the floor slides.If the subsidence on one side of the roof is greater than that on one side of the floor,there is a cliff like phenomenon on one side of the floor,but the development height of the collapse zone is less than the distance from the working face to the mine field boundary.The maximum displacement of roadway group occurs in weak rock strata such as mudstone and coal seam and fault fracture zone,and its disturbance effect increases.In the weak rock stratum,the maximum influence circle boundary of the roadway increases and the influence boundary runs through,but the maximum fracture zone height is 11.5 m,and the upper foot of the fracture zone is not developed to the elevation of the mine field boundary.Therefore,the mining and development of roadway groups in working face have no impact on local coal mining.

关 键 词：急倾斜煤层 扰动效应 数值模拟 垮落带高度 巷硐群 

分 类 号：TD322[矿业工程—矿井建设]