刀柱采空区下伏煤层顶板破断渗流耦合分析

Coupling Analysis of Roof Fracture Seepage in Underlying Coal Seam of Knife Column Gob

以唐山沟煤矿开采现状为例,采用UDEC分析在刀柱式采空区下,由自重应力场及渗流场作用下上覆岩体裂隙扩展、闭合的过程,计算结果显示工作面推进时过程中,顶板岩层受采动影响及采空区煤柱的支撑压力,从而形成"V"字形的裂隙带,产生的裂隙将会以倒梯形方式沟通至上层煤的采空区,并且导水裂隙带快速扩展形成导水通道。

Taking mining status of Tangshangou coal mine as an example, the expansion and closure process of the overlying strata un- der gravity stress field and seepage field in knife column gob are analyzed by using UDEC. The data shows that the ＂V＂ shape of frac- tured zone has been formed by mining impact of roof rock and supporting pressure of gob pillar in the advancing process of working face. The generated fissures will be communicated to the upper coal goaf by inverted trapezoidal, and the water flowing fractured zone rapidly expand to form conductor.