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以三河尖煤矿92202工作面所处的特殊地质条件为背景,为了解决深部近距离煤层群开采过程中下部煤层顶板裂隙发育、巷道支护困难等难题,采用理论计算方法研究了近距离煤层开采过程中下部煤层顶板损伤范围,得出7煤层回采后对9煤顶板的损伤深度为19~20m,并针对9煤顶板条件,提出以高水速凝材料构筑墙体为巷旁支护,结合高强高预应力锚杆与锚索支护进行巷内支护,并在采动影响作用期间辅以单体液压支柱加强顶底板支护。实践表明,92202工作面沿空留巷采用一系列支护配套措施,能够有效地控制沿空留巷围岩的变形与破坏,保持巷道围岩与充填体稳定。
Taking the special geological conditions of 92202 working face of Sanhejian Coal Mine as the background, in order to solve the problems such as the development of fractures in the roof of the lower coal seam and difficulty in roadway support during the mining of deep short distance coal seams, the theoretical calculation method was used to study the process of the mining of short distance coal seam Middle and lower coal seam roof damage range, the conclusion is that the depth of damage of 9 coal roof after coal seam 9 mining is 19 ~ 20m after mining, and according to the conditions of 9 coal roof, it is proposed to construct the wall with high water velocity solidification material as roadside support, Prestressed anchor bolt and anchor support for laneway support, supplemented by single hydraulic props to reinforce roof and floor support during the mining effect. Practice shows that a series of supporting measures are adopted for gob-side entry retaining in 92202 face, which can effectively control the deformation and damage of surrounding rock along gob-side entry and keep the surrounding rock and filling body of the roadway stable.