原位留巷协同控制技术及底鼓治理研究

Technology of Collaborative Control and Floor Heave Treatment for In-situ Retaining Roadway

以山西左则沟煤矿超高水材料巷旁充填留巷为背景,结合原位留巷的巷道围岩运移特征,提出了'斜拉锚索-U钢-充填体'协同控制技术,斜拉锚索悬吊深部岩层、U钢切顶、留巷充填体隔绝采空区,三者共同保持留巷稳定。现场应用初期的矿压观测表明,留巷呈现明显的滞后变形特征,且顶板稳定,巷道变形以底鼓为主,是留巷围岩控制的重点。结合观测结果分析了原因,并对支护方案进行了优化,通过采取密集支柱切顶、架前支护、补打底锚杆等措施,巷道变形明显减少,不需返修或只需简单卧底即可满足二次回采的要求。

Based on the background of filling retaining roadway with super-high water material in the Zuozegou Coal Mine,a synergistic control technology of cable-stayed anchor cable-filling body-U steel is proposed combining with the characteristics of surrounding rock movement of in-situ retained roadway,the cable-stayed anchor cable suspends the deep rock formation,the U steel cut-roof,and the roadway filling body isolates the goaf,and the three together keep the roadway stable.In the initial stage of field application,the observation of rock pressure shows that the retained roadway has obvious lagging deformation characteristics,and the roof is stable.The main deformation of the retained roadway is floor heave,which is the key point of surrounding rock control of the retained roadway.Combining with the observation results,the reasons are analyzed and the supporting scheme is adjusted.By measures of dense pillar roof cutting,pre-support and bottom bolting,the deformation of roadway is obviously reduced,and the requirement of secondary mining can be satisfied without repairing or simply undercover.