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采用大型施工及运营期矿山法隧道渗流模型试验系统,在不同的注浆圈和初衬渗透系数下,不考虑隧道开挖的扰动影响进行涌水量预测,并以Visual-modflow软件进行数值建模分析,结果表明:两者涌水量结果和规律基本吻合,随注浆圈或初衬的渗透系数减小,其试验平均涌水量值均呈非线性下降,各工况单次试验测试值的离散性也逐渐减小,而降低注浆圈渗透系数对涌水量的影响更为明显;改变注浆圈渗透系数,各工况连续采集涌水量结果呈先减小后增大至逐渐平衡的趋势,而改变初衬渗透系数则呈现涌水量逐渐减小直至平衡的趋势;非扰动开挖使地下水向隧道内汇集,隧道周围水力坡度明显增大,等水位线分布密集,掌子面附近等水位线沿隧道开挖方向凹陷;完善的防水体系(初衬及注浆圈)对保持地下水稳定起到显著作用,可有效减弱局部水力联系,减小渗流影响范围,地下水降幅也明显减小。研究方法及成果对类似工程设计和施工具有一定的指导作用。
Large-scale construction and operation period mine tunnel percolation model test system, in different grouting circle and the initial permeability coefficient, without considering the disturbance of tunnel excavation water inflow prediction, and Visual-modflow software for numerical modeling The results show that the results of both water inflow and the law are basically in agreement. With the decrease of permeability coefficient of grouting circle or primary liner, the mean water inflow of the test shows a non-linear decrease, and the discrete values But the effect of reducing the permeability coefficient of grouting circle is more obvious. Changing the permeability coefficient of grouting circle, the results of continuous collection of water inflow in each condition decrease first and then increase to gradually balance, However, changing the permeability coefficient of the primary lining shows that the water inflow decreases gradually until the trend of equilibrium is reached. Undisturbed excavation brings groundwater into the tunnel, the gradient of water around the tunnel increases obviously, the water level is intensively distributed, water level near the face Along the tunnel excavation direction of depression; sound waterproofing system (lining and grouting circle) play a significant role in maintaining the stability of groundwater, which can effectively reduce the local hydraulic contact, reduce the impact of seepage, groundwater Web is also significantly reduced. The research methods and achievements have some guidance to similar project design and construction.