高孔隙率砂岩涌水渗流场特征与注浆治理

Study on the seepage field characteristics and plugging of high porosity sandstone inflow under grouting

将孔隙率引入到多孔介质达西渗流理论中的连续性方程及动量守恒方程,建立均质高孔隙率砂岩非稳定达西渗流数学模型,同时结合实际工程中的水文地质条件,采用数值模拟的方法研究了不同注浆压力下渗流场演化规律及涌水区域水流速度变化。计算结果表明:随着注浆压力的提高,浆液不断驱替砂岩中的孔隙水,有效封堵过水通道;不同注浆压力下巷道涌水区域水流速度变化显著:注浆过程中水流速度降低接近于零,注浆结束后水流速度上升最终达到稳定状态。针对地下工程中高孔隙率砂岩的涌水治理提出了"深部封堵水源、浅层注浆加固"治理原则,通过现场试验,取得了良好治理效果。

Introduced the porosity to porous media Darcy flow theory of the continuity equation and momentum conser- vation equation, established a model of unsteady Darcy seepage field about the homogeneous high porosity sandstone. According to hydrogeological condition of the fields site, seepage field evolution rule and burst water area velocity in different grouting pressure by the numerical simulation. The results show that it is effectively plugging water channel of the continuous slurry displacement the sandstone pore water with the increase of the grouting pressure. Different grou- ting pressure obviously changes tunnel gushing regional velocity：grouting process velocity reduces the close to zero and finally grouting end flow rate rised achieve a stable state. In high porosity sandstone burst water point out that the gov- ernance principle about deep cut source and shallow grouting reinforcement.