特厚煤层回采巷道塑性区形态特征及演化规律研究  

Morphological characteristics and evolution law of plastic zone of mining roadway in extra-thick coal seam

作　　者：镐振 孙光中[1] HAO Zhen;SUN Guangzhong(School of Resources and Safety Engineering,Henan University of Engineering,Zhengzhou 451191,China;State and Local Joint Engineering Laboratory for Gas Drainage&Ground Control of Deep Mines,Henan Polytechnic University,Jiaozuo 454003,China;Research Institute of Mine Safety and Green Mining,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院资源与安全工程学院,河南郑州451191 [2]河南理工大学深井瓦斯抽采与围岩控制技术国家地方联合工程实验室,河南焦作454003 [3]河南工程学院矿山安全与绿色开采研究院,河南郑州451191

出　　处：《煤炭科学技术》2022年第6期77-83,共7页Coal Science and Technology

基　　金：国家自然科学基金资助项目(52104126);河南省高等学校重点科研项目计划支持(21A440001);深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金资助项目(SJF202008)。

摘　　要：针对特厚煤层回采巷道围岩破坏严重的问题,以义马煤田千秋矿21141工作面运输巷为工程背景,采用理论分析和数值模拟的方法,研究了回采巷道塑性区形态特征及其在采动应力作用下的演化规律。结果表明:①塑性区形态特征取决于双向载荷比值,不同的应力条件下,圆形巷道围岩塑性区呈圆形、椭圆形或蝶形分布。②受工作面回采的影响,特厚煤层回采巷道区域主应力场的大小和方向将发生改变。随着到工作面距离的增大,最大主应力沿回采巷道轴向先急剧增大后逐渐减小,在距离工作面处15 m达到峰值,最大主应力与x轴夹角则逐渐增大并接近于竖直方向,最小主应力也呈先增大后缓慢减小,峰值位置在距离工作面约25 m处。③在采动应力作用下,工作面前方回采巷道塑性区形态特征会发生变化。随着到工作面距离的减小,回采巷道两肩角处塑性区不断向深部扩展,其形态由不规则逐渐演化成蝶形,塑性区蝶叶方向会随着最大主应力的变化而发生偏转。研究成果可为特厚煤层开采方案设计、回采巷道支护参数确定等提供理论依据。Aiming at the serious damage of surrounding rock of mining roadway in extra-thick coal seam,the morphological characteristics of mining roadway plastic zone and their evolution law under the action of mining stress was studied by way of theoretical analysis and numerical simulation,taking haulage roadway of No.21141 working face in Qianqiu Coal Mine which locates at Yima Coal Field as the engineering background.The results showed that①The shape characteristics of plastic zone were related to the bidirectional load ratio.Under different stress conditions,there are three different forms of plastic zone of circular roadway:round,oval and butterfly.②Under the influence of working face mining,the magnitude and direction of the principal stress field in the mining roadway of extra-thick coal seam will change.With the increase of the distance to the working face,the maximum principal stress increases sharply first and then decreases gradually along the axial direction of the mining roadway,and reaches its peak at 15 m away from the working face.The Angle between the maximum principal stress and x-axis increases gradually and approaches the vertical direction.The minimum principal stress reached the maximum at about 25 m away from the working face and then decreased slowly.③Under the action of mining stress,the plastic zone morphological characteristics of mining roadway in front of working face will change.With the decrease of the distance to the working face,the plastic zone at the shoulder corner of the mining roadway expands to the depth,and its shape gradually evolves from irregular to butterfly shape.Moreover,the direction of butterfly blade in the plastic zone would be deflected with the maximum principal stress.The research results can provide a theoretical basis for the design of mining scheme of extra-thick coal seam and the determination of supporting parameters of mining roadway.

关 键 词：特厚煤层 回采巷道 蝶形塑性区 采动应力 围岩稳定 

分 类 号：TD353[矿业工程—矿井建设]