大同市焦煤一矿8503工作面切顶卸压小煤柱支护技术研究

Resrarch on Small Coal Pillar Support Technology For Roof Cutting and Pressure Relief in 8503 Working Face of No.1 Coking Coal Mine in Datong City

采用现场调查、数值模拟、力学分析等研究方法,分析了采动冲击环境下切顶卸压效果,相对完整的直接顶更有利于保留采空区沿空巷道围岩的完整性。煤层顶板切顶卸压引起的压力释放明显改善了应力环境,应力不再集中于小煤柱和采空区巷道,所需巷道支护强度大大降低,不再需要进行高强度的小煤柱支护体系的构建,为类似工程条件下的顶板卸压和小煤柱支护技术提供了参考。

By means of field investigation, numerical simulation and mechanical analysis, the effect of roof cutting and pressure relief under mining impact environment is analyzed. The relatively complete direct roof is more conducive to preserving the integrity of surrounding rock of gob-side roadway in goaf. The pressure release caused by roof cutting and pressure relief of the coal seam has significantly improved the stress environment. The stress is no longer concentrated in the small coal pillar and goaf roadway, and the required roadway support strength is greatly reduced. It is no longer necessary to build a high-strength small coal pillar support system, which provides a reference for roof pressure relief and small coal pillar support technology under similar engineering conditions.