地下矿山充填料岩石区域非均质一维渗流规律

One-dimensional seepage laws of backfill-rock in heterogeneous area in underground mines

以地下矿山采场为对象建立了充填料岩石渗流模型,根据实际情况确立初始条件和边界条件,推导出水在充填料和岩石中的渗流压力和流量公式,在此基础上分析了地下充填料岩石中的渗流规律及影响因素.通过分析得出:在充填料中,流量在初始阶段增长较快,达到一个峰值后逐渐下降;压力随时间逐渐降低,最后趋于稳定;渗透率越大,流量和压降越大;高度越高,流量越小而压降越大;孔隙度越小,压力越大,孔隙度对流量的影响在不同阶段各不相同.在岩石中,渗流压力与其渗透率无关,但受充填料渗流的影响较大,随时间降低,渗流流量则只与岩石的渗透率有关.

Taking underground mine stope as the object of study, a fill-rock seepage model was established and the seepage pres-sure and flow formula of water in backfill-rock were deduced according to the practical situation which confirmed the initial and bounda-ry conditions. Based on that, the seepage laws and influencing factors were analyzed. The results show that in backfill, the flow increa-ses rapidly in the initial stage, then reaches a peak and gradually declines; the seepage pressure decreases gradually and tends to be stable;the larger the permeability, the larger the flow and pressure drop;the higher the height, the smaller the flow and the larger the pressure drop;the smaller the porosity, the higher the pressure. Porosity has different effects on the flow in different stages. In the rock, seepage pressure has no relationship with the permeability but greatly affected by the seepage of back-fill and declines with time. The flow only relates to the rock mass permeability.