【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20m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 sur⁃ rounding rock. 【Methods】The roof cuttings of single roadway in belt channeling and return air chan⁃ neling in Gucheng N1302 face were taken as the engineering research objects to achieve effective pres⁃ sure 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.【Find⁃ ings】 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.