深部煤矿井下采煤-充填空间优化布局方法

Optimal layout methods of underground mining-backfilling space in deep mine

针对深部采选充一体化矿井内采煤-充填空间协调布局问题,采用德尔菲-层次分析法确定了影响采、充空间布局各因素的相对权重,推导得到了采、充空间布置参数与工艺参数的动态调整方程,模拟研究了适用于“控、防、留”3类工程需求的采-充空间布局策略,构建了采-充空间优化布局决策模型.结果表明:选用采-充空间集中布置、局部密实充填方案时,地表沉陷控制与冲击地压防治效果最好;基于“以采定充”、采充空间分散布置的限定条件,新巨龙煤矿井下需同时布置1303N-1,1304N两个充填面以满足伴生矸石就地消化需求,且整体充实率不应低于55%,同时,为确保留巷围岩稳定,巷旁加强充填带的充实率需达80%以上、宽度不得小于10 m.

Aiming at the problem of coordinated layout of the mining-backfilling space in deep mine with integration of mining,dressing and backfilling,the relative weights of all factors affecting the layout of mining-backfilling space were determined by Delphi-Analytic hierarchy process. The dynamic adjustment equations of layout parameters and process parameters of the mining-backfilling space were derived. The optimal layout strategies of mining-backfilling space were simulated and studied,which was suitable for subsidence control,rockburst prevention and retained roadway surrounding rock control. The decision-making models of the optimal layout of mining-backfilling space were established. The results show that the effects of subsidence control and rockburst prevention are the best when the scheme of the centralized layout of mining-backfilling space and the local dense backfilling is applied. The Xinjulong coal mine is limited by the conditions of “backfilling determined by mining” and decentralized layout of mining-backfilling space. The backfilling workfaces of 1303N-1 and 1304N should be arranged to meet the requirements of in-situ treatment of underground associated gangue. And the overall backfill ratio should not be less than 55%. At the same time,the backfill ratio of the reinforced backfilling zone near the retained roadway should be more than 80% and the width should not be less than 10 m,so as to ensure the surrounding rock stability of retained roadway.