膨胀型软岩顶板沿空巷道支护设计优化

Optimization of Support Design for Expansive Soft Rock Roof along Empty Roadway

摘要: 针对王家岭煤矿软岩顶板沿空巷道围岩稳定性控制中存在的问题，本文通过试验研究、理论分析、数值计算等研究方法，确定了厚泥岩顶板物理力学性质，在此基础上，分析了现有支护中存在的问题，给出在支护优化设计中应考虑的因素，通过数值模拟分析得到了沿空巷道的合理支护方案及参数，并进行了工程应用。结果表明，采用新支护方案的300 m试验段支护效果明显改善，巷道开掘支护3个月内断面顶底板平均移近量为160 mm，顶板完整性保持较好。

Abstract: Aiming at the problems existing in the stability control of surrounding rock of soft rock roof in Wangjialing Coal Mine, this paper determines the physical and mechanical properties of thick mudstone roof by experimental research, theoretical analysis and numerical calculation. On this basis, it analyzes the problems existing in the existing support; the factors that should be consid-ered in the optimization design of the support are given. The reasonable support schemes and pa-rameters of the roadway along the empty road are obtained through numerical simulation analysis, and the engineering application is carried out. The results show that the support effect of the 300 m test section with the new support scheme is obviously improved. The average moving amount of the top and bottom of the section of the tunnel excavation support is 160 mm within 3 months, and the integrity of the roof remains good.