为了优化高地应力缓斜半煤岩巷道的断面形状,以东欢坨矿3018工作面运道为工程背景展开研究。通过复变函数理论推导得出了倾斜煤层中不同断面形状的应力解析解,然后运用FLAC3D数值模拟求解了不同断面形状巷道的应力集中和塑性区情况,并以此为基础确定了巷道最优断面形状,最后结合现场工业性试验对研究结果的可靠性进行了验证。研究结果表明:高地应力作用下缓斜半煤岩巷道破坏呈现非对称形式;不管断面形状如何,巷道均在左、右两底角处呈现高应力集中,且应力集中程度矩形>梯形>直墙拱形;直墙拱形巷道稳定性最佳,梯形巷道次之,矩形稳定性最差,确定直墙拱形为最终巷道断面形状;现场巷道表面位移量监测结果表明,直墙拱形巷道更能满足现场安全生产要求。

In order to optimize the cross-section shape of gently inclined semi-coal roadway with high geostress, the study was carried out with the roadway of 3018 working face in Donghuantuo Mine as the engineering background. The analytic stress solutions of different cross-section shapes in inclined coal seam are derived with the theory of complex variable function, and then the stress concentration and plastic zone of tunnels with different cross-section shapes are solved using FLAC3D numerical simulation, and the optimal cross-section shape of tunnels is determined on this basis. Finally, the reliability of the research results is verified by field industrial tests. The results show that the failure of gently inclined semi-coal roadway is asymmetric under the action of high ground stress; Regardless of the cross-section shape, the roadway presents high stress concentration at the left and right bottom corners, and the stress concentration degree is rectangular > trapezoidal > straight wall arch; The stability of straight-wall arched roadway is the best, followed by trapezoidal roadway, and the rectangular stability is the worst. It is determined that straight-wall arched roadway is the final roadway section shape. The monitoring results of roadway surface displacement show that the straight-wall arched roadway can better meet the requirements of on-site safety production.

1 工程背景
2 倾斜煤层巷道围岩应力函数解
2.1 理论分析
2.2 矩形断面复变应力函数解
2.3 梯形断面复变函数解
2.4 直墙拱形断面复变函数解
2.5 巷道应力对比分析
3 数值模拟验证分析
3.1 模型建立
3.2 应力结果分析
3.3 塑性区结果分析
4 工程实践
5 结 论