李堂煤矿薄煤层开采沿空留巷技术研究与应用

Study and application of gob-side entry retaining technology in thin seam mining in Litang Coal Mine

为提高薄煤层回收率和改善采掘接替紧张关系,以李堂煤矿9-2薄煤层92102轨道巷为工程背景,采用FLAC3D数值模拟,研究不同宽度条件下充填支护墙体的应力和巷内塑性区分布,确定合理的巷内支护参数和巷旁支护参数,并进行了工业性实践。现场测试得到了92102轨道巷围岩变形规律。通过矿压监测结果分析,得出该留巷围岩的变形规律,李堂煤矿92102轨道巷沿空留巷所采用的巷旁充填方案在技术上可行,满足工程实践要求。

In order to improve the recovery rate of thin coal seam and ease the tension relationship between the mining and tunnelling,taking 92102 track roadway in 9-2 thin coal seam in Litang Coal Mine as engineering background,this paper adopted the FLAC3D numerical simulation method to simulate the distribution of stress in filling support wall and the plastic zone in the roadway with different width of filling wall,and based on the results,the reasonable entry support parameters and entry-side support parameters were determined,and the industrial practice was carried out.The field test achieved the deformation rule of surrounding rock of 92102 track roadway.On the basis of the analysis of mine pressure monitoring results,the deformation rule of surrounding rock of gob-side entry retaining was achieved.The entry-side filling scheme adopted by the gob-side entry retaining in 92102 track roadway of Litang Coal Mine was feasible technically and could meet the needs of engineering practice.