厚煤层双巷布置切顶卸压作用机制  

Mechanism of Roof Cutting and Pressure Relief for Double Roadway Arrangement in Thick Coal Seam

作　　者：韩秉呈 张昌锁[1] 张晨 王世宇 HAN Bingcheng;ZHANG Changsuo;ZHANG Chen;WANG Shiyu(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,太原030024

出　　处：《太原理工大学学报》2024年第6期989-999,共11页Journal of Taiyuan University of Technology

基　　金：爆炸科学与技术国家重点实验室开放基金项目资助(KFJJ20-05M)。

摘　　要：【目的】探究厚煤层双巷布置切顶卸压顶板运移规律及围岩支承压力分布机制。【方法】以古城N1302工作面胶带顺槽与回风顺槽为工程背景,对胶带顺槽单巷切顶实现双巷有效卸压,采用理论分析、现场试验与数值模拟相结合的方式,研究切顶卸压对于双巷布置的作用机制。【结果】结果表明:理论计算发现切顶后内应力场范围明显增大,能够有效减小胶带顺槽受力;现场试验发现相较于未切顶时,切顶高度为20 m时切巷围岩变形明显下降,但高位关键层提前回转造成回风顺槽在服务期间底鼓量增大。数值模拟发现在巷间煤柱宽度一定时,未切断上部关键层时提高切顶高度对煤帮垂直应力影响不大,当切断高位关键层时,回风顺槽煤帮垂直应力明显下降;在切顶高度一定时,改变巷间煤柱宽度可控制回风顺槽受力情况。【Purposes】This research is conducted to exploret the roof movement law of double roadway arrangement in thick coal seam and the abutment pressure distribution mechanism of surrounding rock.【Methods】The roof cuttings of single roadway in belt channeling and return air channeling in Gucheng N1302 face were taken as the engineering research objects to achieve effective pressure relief in double roadway.Theoretical analysis,field tests,and numerical simulation were used to investigate the mechanism of roof cutting and pressure relief on double roadway arrangements.【Findings】The results show that,according to theoretical calculation,the range of the internal stress field increases obviously after roof cutting,which can effectively reduce the stress of the belt along the groove.Field tests show that the deformation of the surrounding rock is significantly reduced when the top cutting height is 20 m,but the key layer of the upper level turns ahead of time,increasing the floor heave during the service of the return air channeling channel.The numerical simulation results show that the vertical stress of the coal wall is not affected by increasing the cutting height when the upper key layer is not cut off.While when the upper key layer is cut off,the vertical stress of the coal wall in the return air channeling channel decreases obviously.When the cutting height of the top is fixed,changing the width of the coal pillar between lanes can control the stress of the return air channeling.

关 键 词：双巷卸压 内外应力场 覆岩结构 矿压显现 

分 类 号：TD322[矿业工程—矿井建设]