上分层遗留区段煤柱下斜交工作面综放开采覆岩结构演化特征  

Evolution characteristics of overburden structure in inclined fully mechanized caving under residual coal pillars of the upper layer

作　　者：刘用 王红伟[2,3] 吴学松 田程鹏 关荣福 聂云枭 范志伟 曹沛沛 LIU Yong;WANG Hongwei;WU Xuesong;TIAN Chengpeng;GUAN Rongfu;NIE Yunxiao;FAN Zhiwei;CAO Peipei(Yanbei Coal Mine,Gansu Huating Coal Power Co.,Ltd.,Huating 744100,China;College of Energy Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an 710054,China;Technical Center,Huating Coal Industry Group Co.,Ltd.,Huating 744100,China)

机构地区：[1]甘肃华亭煤电股份有限公司砚北煤矿,甘肃华亭744100 [2]西安科技大学能源学院,陕西西安710054 [3]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [4]华亭煤业集团有限责任公司技术中心,甘肃华亭744100

出　　处：《工矿自动化》2024年第12期46-58,共13页Journal Of Mine Automation

基　　金：国家自然科学基金面上项目(51974230,52474149);陕西省杰出青年科学基金项目(2023-JC-JQ-42);华能集团总部科技项目(6000230484)。

摘　　要：特厚煤层分层综放开采上下分层工作面斜交布置时,下分层综放工作面间歇性过上分层遗留区段煤柱导致覆岩破断运动及矿压显现规律复杂,围岩控制困难,制约了煤矿安全生产。以甘肃华亭煤电股份有限公司砚北煤矿250203下综放工作面为工程背景,采用物理相似模拟实验、数值计算、现场实测相结合的方法,研究了上分层遗留区段煤柱下斜交工作面综放开采覆岩运移规律及应力分布演化特征,阐明了下分层综放工作面开采扰动下上分层遗留区段煤柱失稳特征及围岩支承压力变化规律,定义了斜交工作面覆岩内场和外场,揭示了下分层综放工作面过遗留区段煤柱覆岩结构演化特征。研究结果表明:①下分层综放工作面开采诱发上分层遗留区段煤柱失稳导致覆岩大尺度空间垮落,扰动区内顶板结构渐次演化,形成“低位倒台阶组合悬臂梁+高位大结构砌体梁”组合结构。②在工作面距区段煤柱15 m时,区段煤柱最大垂直应力达到46.7 MPa,较下分层未开采时增大了9.9%,煤柱形变现象较为明显;工作面位于区段煤柱正下方时,区段煤柱应力集中区域呈近似“月牙状”分布。③随着下分层综放工作面与上覆遗留区段煤柱斜交位置变化,外场覆岩破断形态呈近似对称梯形,结构动态失稳导致内场垮落形态呈“非对称双拱”、“对称双拱”、“单拱”演化过程。研究结果对特厚煤层分层综放工作面安全开采具有指导意义。In the stratified fully mechanized caving of ultra-thick coal seams,the inclined layout of upper and lower caving faces leads to lower fully mechanized caving face intermittently crossing residual coal pillars of the upper layer.This results in complex overburden breakage and mine pressure behavior,posing challenges to surrounding rock control and hindering safe coal production.Based on the 250203 lower fully mechanized caving face at Yanbei Coal Mine of Gansu Huating Coal Power Co.,Ltd.,methods of physical similarity simulation experiments,numerical modeling,and field measurements were applied to study the overburden movement and stress distribution evolution characteristics under residual coal pillars of the upper layer during inclined fully mechanized caving.The instability characteristics of residual coal pillars of the upper layer and the variation patterns of surrounding rock support pressure under the disturbance of lower fully mechanized caving were clarified.The overburden of the inclined working face was categorized into internal and external fields,and the evolution characteristics of the overburden structure when the lower fully mechanized caving face crossed the residual coal pillars were revealed.The results showed that the mining of the lower fully mechanized caving face induced instability in residual coal pillars of the upper layer,resulting in large-scale overburden collapse.The roof structure within the disturbed zone evolved progressively into a composite structure of"low-level inverted step cantilever beams and high-level large masonry beams".When the working face was 15 m from the residual coal pillar,the maximum vertical stress of the pillar reached 46.7 MPa,an increase of 9.9%compared to the premining state,with significant pillar deformation observed.When the working face was directly beneath the residual coal pillar,the stress concentration zones of the pillar displayed an approximately crescent-shaped distribution.As the inclined position of the lower fully mechanized caving face relati

关 键 词：特厚煤层 分层综放开采 遗留区段煤柱 斜交工作面 覆岩结构 

分 类 号：TD325[矿业工程—矿井建设]