大采高综放工作面开采沉陷规律数值分析及其监测试验研究  

Numerical analysis and monitoring experimental research on mining subsidence law of fully-mechanized caving face with large-height mining

作　　者：张伟 陈志远 陈元祯 王亚朋 杨桂林 尹星翰 ZAHNG Wei;CHEN Zhiyuan;CHEN Yuanzhen;WANG Yapeng;YANG Guilin;YIN Xinghan(Jinjitan Mine,Shanxi Future Energy Chemical Co.,Ltd.,Yulin 719000,China;School of Civil Engineering and Architecture,Dalian University,Dalian 116622,China)

机构地区：[1]陕西未来能源化工有限公司金鸡滩煤矿,陕西榆林719000 [2]大连大学建筑工程学院,辽宁大连116622

出　　处：《煤炭科技》2024年第6期67-75,79,共10页Coal Science & Technology Magazine

基　　金：国家自然科学基金资助项目(51674058)。

摘　　要：为了研究金鸡滩煤矿浅埋深大采高综放工作面开采地表沉陷与变形规律,通过现场监测、数值模拟、理论分析等多种手段,得到了上述浅埋深大采高综放开采的地表移动规律。通过绘制工作面回采过程中沿走向和倾向主断面的地表下沉、倾斜、曲率、水平移动、水平变形和下沉速度变化曲线,确定了地表移动启动距、超前影响角、最大下沉速度滞后角、移动过程持续时间等动态移动参数。根据最终的地表下沉和水平位移观测结果,确定了地表移动稳定后的角量参数,包括沿走向和倾向的边界角、移动角、裂缝角、最大下沉角、充分采动角等。根据117工作面地质采矿条件构建了开采沉陷数值计算模型,利用FLAC^(3D)计算机模拟软件揭示了浅埋深大采高工作面开采引起的岩层与地表的位移分布特征、应力分布特征,并通过对塑性区的分析,得到开采区上方的垮落裂缝带高度达120 m,地表开采裂缝预计深度在27 m以内,整个采深为260 m。通过模拟分析、理论计算和现场实测得出的下沉曲线基本吻合,表明通过三者结合的方式可以有效监测大采高综放开采下的沉陷,为金鸡滩煤矿及其他类似地质条件下的矿区地面保护工作提供可靠的科学依据。In order to study the surface subsidence and deformation law of shallow buried deep and fully-mechanized caving face with large-height mining in Jinjitan Coal Mine,the surface movement law of shallow buried deep and fully-mechanized caving face with large-height mining was obtained through various means such as field monitoring,numerical simulation and theoretical analysis.By drawing the surface subsidence,inclination,curvature,horizontal movement,horizontal deformation and subsidence velocity change curves along the strike and inclination of the main section during the mining process of the working face,the dynamic moving parameters such as the starting distance of surface movement,the leading influence angle,the maximum sinking speed lag angle,and the duration of the moving process were determined.According to the final observation results of surface subsidence and horizontal displacement,the angular parameters after the stabilization of surface movement were determined,including the boundary angle,movement angle,crack angle,maximum subsidence angle,and full mining angle along strike and inclination.According to the geological mining conditions of the No.117 working face,the numerical calculation model of mining subsidence was constructed,and the FLAC^(3D) computer simulation software was used to reveal the displacement distribution characteristics and stress distribution characteristics of the rock layer and the surface caused by the mining of shallow buried deep and large-height mining,and through the analysis of the plastic zone,the height of the falling fracture zone above the mining area was 120 m,the estimated depth of the surface mining crack was less than 27 meters,and the entire mining depth was 260 m.The subsidence curves obtained through simulation analysis,theoretical calculation,and on-site measurement were basically consistent,showing that the subsidence under fully-mechanized caving face with large-height mining can be effectively monitored through the combination of the three.These findings can

关 键 词：大采高综放 开采沉陷 数值分析 监测试验 

分 类 号：TD325[矿业工程—矿井建设]