切顶卸压切缝参数设计与巷道围岩应力演化规律研究  

Research on Parameter Design of Roof Pressure Relief Slit and Stress Evolution Law of Roadway Surrounding Rock

作　　者：王柯童 弓培林[1] 赵通[1] WANG Ketong;GONG Peilin;ZHAO Tong(College of Mining Engineeing,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：《煤炭技术》2023年第3期59-63,共5页Coal Technology

摘　　要：针对强采动影响下切顶卸压护巷效果不佳的问题,以长平煤矿5302回风顺槽预裂爆破切顶卸压为工程背景,利用3DEC离散元数值模拟软件,生成不同曲率半径的切缝,对其护巷效果与巷道围岩应力演化规律进行研究,并将切缝为曲率半径16 m的模拟结果与切缝为直线的模拟结果进行对比。结果表明,相较于直线切缝,当切缝为曲线时,顶板下沉量与底鼓量分别减小了30.9%和28.57%,实体煤帮与煤柱帮变形量分别减小了45.03%与28.6%,实体煤帮与煤柱帮垂直应力峰值分别减小了24.88%与24.47%。当切缝为曲率半径16 m的曲线时,巷道上覆岩层垮落堆积的岩体能够与煤柱形成较好的承载体系,有效地切断了采空区上覆岩层与巷道顶板之间的力学联系,改善了巷道的围岩力学环境。Aiming at the problem of poor pressure relief effect of roadway protection under the influence of strong mining, taking the roof pressure relief effect of pre-split blasting for 5302 return air passage in Changping coal mine as the engineering background, 3DEC discrete element numerical simulation software was used to generate slit with different radius of curvature, and the roadway protection effect and surrounding rock stress evolution law were studied. The simulation results with a curvature radius of 16 m are compared with those with a straight line. The results show that when the seam is curved, the roof subsidence and floor heave are reduced by 30.9% and 28.57% respectively,the deformation of solid seam and pillar seam are reduced by 45.03% and 28.6% respectively, and the vertical stress peak value of solid seam and pillar seam is reduced by 24.88% and 24.47% respectively.When the cutting seam is a curve with curvature radius of 16 m, the rock mass accumulated by overburden strata can form a better bearing system with coal pillar, effectively cutting the mechanical connection between overburden strata in goaf and roadway roof, and effectively improving the mechanical environment of surrounding rock in roadway.

关 键 词：强采动 切顶卸压 应力演化 切缝 曲率半径 

分 类 号：TD322[矿业工程—矿井建设]