富水区隧道渗漏病害虹吸排水处置方法模型试验研究

针对隧道渗漏水病害问题,提出了一种新型隧道虹吸排水处置方法。通过室内物理模型试验,分析了虹吸排水作用对隧道围岩地下水的影响。结果表明:虹吸排水系统对地下水位的分布影响较大,虹吸管处地下水位变化尤为明显。降雨强度是影响虹吸排水流量的重要因素,降雨强度增大,虹吸排水流量先增大后维持最大流量不变,降雨所需疏干时间增长。围岩渗透系数与虹吸管径是影响地下水位分布与虹吸排水效果的重要因素,围岩渗透系数与虹吸管径越大,地下水位整体降深越大,虹吸排水流量维持在最大流量的稳定时间越短,地下水疏干时间越短,虹吸排水效果越好。

Experimental Study on Siphon Drainage Method for Mitigating-Tunnel Leakage in Water-rich Area

This paper proposes a new siphon drainage method for treating the leakage of tunnels under operation. A series of physical model experiments were carried out to analyze the influence of siphon drainage action on the groundwater in the surrounding rock masses of the tunnel. The results show that siphon drainage system has a significant influence on the distribution of groundwater level, especially at the location of siphon pipe installation. Rainfall intensity is one of the most important factors that affect the discharge capacity of the siphon drainage. When the rainfall intensity increases, the discharge amount of siphon drainage increases very fast at the beginning and then is kept at its maximum flow rate. Meanwhile, it requires more time to drain off all infiltrated rain water. Furthermore, the permeability coefficient of surrounding rock and the siphon pipe diameter are the two other influence factors that determine the distribution of groundwater level and the effect of siphon drainage. When the permeability coefficient of surrounding rock and the siphon pipe diameter are both relatively larger, the drawdown of the groundwater level is also larger, the duration of steady siphon drainage at the maximum flow rate becomes shorter and the time required to drain off all the rain water is also shorter. Therefore, the effect of the siphon drainage is quite good in such situation.