三软厚煤层超前切顶沿空留巷充填墙稳定性与尺寸优化研究

以赵家寨煤矿三软厚煤层大跨度回采巷道沿空留巷为工程背景，结合扩巷后工程实际，提出超前切顶卸压巷内充填留巷方案。通过理论分析及数值模拟方法，对比分析了不切顶与切顶条件下回采巷道围岩应力特征，确定了切顶条件下充填墙的留设宽度为2.2m。现场监测结果表明，超前切顶卸压条件下，充填墙宽度为2.2m时，能够有效维护回采巷道的稳定。研究成果可为类似条件下三软厚煤层大跨度回采巷道沿空留巷提供一定参考。

Stability And Size Optimization of Filling Wall Along the Gob of the Super-cutting Roof of Three Soft And Thick Coal Seams

Abstract: Based on the engineering background of the large-span mining roadway in the three soft and thick coal seams of Zhaojiazhai Coal Mine, combined with the actual project after the road expansion, the plan of filling and retaining roadway in the pre-cut roof is proposed. Through theoretical analysis and numerical simulation method, the stress characteristics of surrounding rock in mining roadway under non-cutting and cutting conditions are compared and analyzed, and the remaining width of filling wall under cutting condition is determined to be 2.2m. The on-site monitoring results show that under the condition of pre-cutting top pressure relief, when the filling wall width is 2.2m, the stability of the mining roadway can be effectively maintained, and the roadway can be smoothly carried out. The research results can provide a reference for the retaining of the long-span mining roadway in the three-thick thick coal seam under similar conditions.