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为解决林西矿建筑物下煤炭资源回收的问题,结合其埋深大、顶板坚硬的地质条件,提出先采用较小采宽和较大留宽进行条带开采,等地表变形稳定后,对条带开采的保留煤柱进行二次条带开采。以关键层理论为基础,采用理论分析、数值模拟和现场实测的方法研究了条带开采和二次条带开采;得出以亚关键层1为开采设计依据;确定了条带开采方案,采宽60 m,留宽120m;二次条带开采时采用窄煤柱沿空掘巷,采宽60 m,留宽55 m。研究结果表明:亚关键层1控制着地表下沉变形;条带开采和二次条带开采引起的地表变形对建筑物的损坏均在Ⅰ级损坏内。在林西矿九东区域进行了工业性试验,取得了较好的效果。
In order to solve the problem of recovery of coal resources in Linxi mine buildings, combined with the geological conditions of deep buried and hard roof, it is proposed that the mining should be carried out with smaller mining width and larger reserve width first, Strip mining reserved pillars for secondary strip mining. Based on the key layer theory, the strip mining and the secondary strip mining were studied by means of theoretical analysis, numerical simulation and on-site measurement. The sub-critical layer 1 was selected as the mining design basis. The strip mining plan was determined. Width 60 m, stay width 120m; secondary mining with narrow pillars mining roadway along the goaf, mining width 60 m, leaving 55 m wide. The results show that the sub-critical layer 1 controls the deformation of the ground surface, and the surface damage caused by the strip mining and the secondary strip mining all damages the building within Class I damage. The industrial test was carried out in Jiu Dong area of Linxi Mine and achieved good results.