深部巷道断层涌水治理研究

Study on treatment of fault water gushing in deep roadway

在系统研究巨野矿区某深井矿山胶带巷断层高压涌水特征的基础上,提出并实施了"疏水降压+浅部加固+深部截源"的治理方案。依据物探及水文地质分析,施工泄压钻孔进行疏水降压,使巷道周围含水层水压降至合理范围,结合中空螺旋注浆锚杆进行巷道浅部围岩加固,最终进行深部注浆封堵水源。为确定合理的疏水降压值,基于COMSOL有限元分析,建立渗流场-应力场耦合模型进行数值试验,模拟不同降压值情况下孔隙水压力以及围岩应力、位移的相应变化,数值试验优选最佳疏水降压值为3 MPa。现场实施后,有效封堵了巷道断层高压涌水,减水率达91%,且治理后巷道围岩稳定,满足了安全生产需要。

On the basis of systematic studies of the characteristics of high-pressure water gushing in the belt roadway of a deep mine in the Juye mining area, the treatment plan of ＂water pumping and pressure releasing＋shallow reinforcement＋deep source cut＂ is put forward and implemented. According to the geophysical prospecting and hydrogeological analysis, the drilling drainage could make the aquifer water pressure dropped to a reasonable range, then the hollow spiral grouting bolt is used to reinforce the shallow rocks, finally the source of water is cut off by grouted in deep area. To determine the reasonable values of water pumping and pressure releasing, based on the finite element analysis of COMSOL, the coupling model of seepage field and stress field is established to carry out numerical tests, variations of pore water pressure and stress and displacement of surrounding rock under different water pumping and pressure releasing values are simulated. The optimum water pumping and pressure releasing value of numerical test is reduced to 3 MPa. After the application of the scheme in the field, the high-pressure fault gushing water is effectively sealed with a water reduction ratio of 91% and the surrounding rock is stable to meet needs of safety production.