多重采动作用下孤岛面沿空巷道支护优化研究

Optimization Study of Gob-side Roadway Supporton Island Working Face under Multiple Mining

煤矿开采过程中,在高地应力作用下容易发生潜埋薄基岩覆岩迁移,采场强矿压显现诱发巷道围岩结构变形失稳。在设计转龙湾煤矿二采区新掘采动巷道23206胶运顺槽时,根据煤矿实际工程地质条件,采用理论分析、实验室围岩物理力学参数测试、钻孔围岩结构探测、强采动巷道围岩稳定性演化规律、数值模拟等技术手段进行分析,明确转龙湾煤矿已掘强采动巷道的合理支护技术要求,分析掘巷期间不同支护方案下的围岩稳定性,从而确定23206胶运顺槽的支护方案。研究表明,卸压使得煤体浅部应力值降低,利于围岩承载结构的形成,卸压能够一定程度地减小围岩变形;锚固强化了煤帮浅部煤体,巷道整体变形量显著降低;因此“卸压-锚固一体化”协同稳控技术具备应对强采动巷道尤其是实体煤帮应力集中的沿空巷道支护能力。

During coal mining,the migration of buried thin bedrock overburden is prone to occur under high geo-stress,and the strong mining pressure induces the deformation and instability of the surrounding rock structure of the roadway.In the design of the 23206 belt transportation gateway of the new excavation roadway in the second mining area of Zhuanlongwan Coal Mine,this study employed various technical approaches based on its actual engineering geological conditions,including theoretical analysis,laboratory testing of physical and mechanical parameters of surrounding rocks,the detection of surrounding rock structures of the boreholes,the stability evolution patterns of surrounding rock in strong mining roadways,and the numerical simulations.The research aimed to clarify the reasonable support technical requirements for the excavated strong mining roadways in Zhuanlongwan Coal Mine and analyze the surrounding rock stability under different support schemes during excavation to determine the support schemes for the 23206 belt transportation gateway.The results show that stress relief reduces stress values in shallow coal bodies,which is conducive to the formation of bearing structures in surrounding rocks and,to some extent,minimizes the surrounding rock deformation.Anchoring strengthened the shallow coal body of the coal walls,significantly reducing overall roadway deformation.Therefore,the“pressure relief-anchoring integration”collaborative stability control technology can cope with the strong mining roadways,especially the gob-side entry where the stress of the solid coal wall is concentrated.