大倾角工作面巷道断面形式优化数值模拟

Numerical Simulation of Cross-section Shape Optimization for Large Dip Angle Working Face

针对大倾角工作面梯形巷道顶板破碎、较高侧煤帮变形破坏严重的现象,以陈蛮庄煤矿3402工作面轨道巷为工程背景,结合现场实际和UDEC2D数值模拟,对比分析了巷道矩形开挖和梯形开挖时围岩破坏特征,并根据矩形巷道顶板三角煤的破坏特征提出了五边形巷道断面形式。对3种断面形式下巷道横截面积、断面支护长度以及围岩稳定性进行了对比研究。研究表明:对于大倾角工作面,五边形巷道断面形式相比于矩形巷道有效提升了回采工程的活动空间,合理摒弃了位于顶板的不易支护的部分三角煤;相比于梯形巷道合理降低了巷道支护成本,提升了直接顶板的稳定性。因此,五边形工作面巷道更有利于大倾角工作面的安全高效生产。

For the phenomenon that seriously broken roof and severe deformation and crack in higher coal-side in trapezoid roadway of steeply dipping working face,taking railway roadway at 3402 working face of Chenmanzhuang Coal Mine as background,combined with field practice and UDEC2 Dnumerical simulation,surrounding rock failure characteristics in rectangular roadway and trapezoid roadway were compared.Based on the failure characteristics of triangle coal in rectangular roadway roof,pentagon roadway section form was proposed.Roadway cross section,section supporting length and surrounding rock stability of three kinds of roadway were compared.Results show that in steeply dipping working face,compared with rectangular roadway,pentagon roadway enlarged the mining activity space effectively and reasonably abandoned part of the roof triangle coal that is difficult to support.Compared with trapezoid roadway,pentagon roadway decreased the roadway supporting cost and increased the stability of immediate roof and coal sides.Therefore,pentagon roadway is more fit to the safe and effective production of steeply dipping working face.