Cilinshan Coal Mine, Shanxi Lu’ an Chemical Group Cilinshan Coal Industry Co., Ltd.
School of Civil Engineering, Henan Polytechnic University

为研究房柱式采空区下行开采顶板突水灾变规律,以郭家湾煤矿51207工作面为工程背景,采用大井法理论和岩体渗流理论对矿井涌水量进行分析,利用FLAC3D数值分析软件对采动影响下顶板岩体的渗透系数及涌水量的变化进行研究。结果表明,矿井最大涌水变化量109.62m3/h,持续时间约为24d;工作面推进至70m,51207工作面顶板出现大面积的采空区,且渗透系数大幅增至1×10-5m/s;当导水裂隙带连通房柱式采空区和51207工作面后,涌水量变化量会快速达到118m3/h左右;郭家湾煤矿51207工作面下行开采无突水危险性。

In order to study the disaster law of roof water inrush in downward mining of room and pillar goaf, taking the51207 working face of Guojiawan Coal Mine as the engineering background, the mine water inflow was analyzed by using thetheory of large well method and rock mass seepage theory, and the changes of permeability coefficient and water inflow ofroof rock mass under the influence of mining were studied by using FLAC3D numerical analysis software. The results showthat: the maximum variation of mine water inflow is 109. 62 m3 / h, and the duration is about 24 days; When the working faceadvances to 70 m, a large area of goaf appears in the roof of the 51207 working face, and the permeability coefficient increases to 1 × 10 - 5 m/ s in a large range; When the water flowing fractured zone connects the room pillar goaf and the 51207working face, the variation of water inflow will quickly reach about 118 m3 / h; There is no water inrush risk in downwardmining of 51207 working face of Guojiawan Coal Mine.

国家自然科学基金(41807209)