摘要
以红庆河煤矿首采工作面3-1101沿空掘巷为工程背景,综合应用内外应力场及极限平衡理论、数值模拟、工程实践等研究方法,确定深部大采高沿空掘巷窄煤柱合理宽度为6m,并针对性地提出了锚杆索喷联合控制技术。研究表明:①理论计算显示,内应力场宽度为12.5m,上区段采动下煤柱破碎区宽度为2.1m,窄煤柱合理宽度范围为4.7~7.3m;②数值模拟结果显示,6~10m煤柱尺寸时,煤柱与实体煤侧都存在一定的应力集中,煤柱受力增强,且煤柱和巷道上方围岩出现弹性核区,有利于锚杆索发挥锚固作用;③工程实践表明,6m宽度窄煤柱及锚杆索喷联合控制技术可有效控制沿空巷道围岩大变形,巷道顶帮围岩超过2.6m深度的煤体完整性较好,支护完成35d后巷道收敛变形趋于稳定,煤柱侧顶板、实体煤侧顶板、煤柱帮及实体煤帮最大变形量分别为63m、57m、46m、34mm。
Taking gob-side entry driving of 3-1101 working face in Hongqinghe Coal Mine as the engineering background,the internal and external stress field theory,limit equilibrium zone theory,numerical simulation and engineering practice are comprehensively applied to determine the reasonable width of narrow coal pillar for gob-side entry driving in 6m high-cutting working face of deep mine.The combined control technology of bolt-cable-shotcreting is put forward.The results show that:The width of the internal stress field is 12.5m,the width of coal pillar broken area is 2.1m under the mining influence in the upper section,and the reasonable width of the narrow coal pillar is 4.7~7.3m.When the coal pillar size is 6~10m,there is a certain stress concentration in the pillar and the solid coal side.The stress of the coal pillar is enhanced.The elastic area appears in the surrounding rock above the coal pillar and the roadway,which is conducive to the bolt(cable)to play the role of anchoring.With the 6m narrow coal pillar and combined control technology of bolt-cable-shotcreting,the large deformation of surrounding rock is under control in gob-side entry driving.The integrity of coal body 2.6m deeper from the roadway roof and rib is good.After 35 days,the roadway convergence tends to be stable.The maximum deformation of the roof on the coal pillar side,the roof on the solid coal side,the coal pillar wall and the solid coal wall are 63mm,57mm,46mm and 34mm,respectively.
作者
田春阳
常云博
朱涛
郑立永
姜光
邢旭东
TIAN Chun-yang;CHANG Yun-bo;ZHU Tao;ZHENG Li-yong;JIANG Guang;XING Xu-dong(Beijing Tiandi Huatai Mining Management Co.,Ltd.,Beijing 100013,China;School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《煤炭工程》
北大核心
2021年第12期39-44,共6页
Coal Engineering
基金
天地华泰自主创新项目资助(TDHTKY2020005)
天地科技股份有限公司科技创新创业资金专项资助项目(2020-TD-MS007)。
关键词
深部矿井
大采高
沿空掘巷
煤柱尺寸
围岩控制
deep mine
large mining height
gob-side entry driving
coal pillar size
surrounding rock control
