帷幕注浆加固法在高含水率黄土隧道中的应用

Application of Curtain Grouting Reinforcement Technique in Tunnel with High Water Content Loess Stratum

隧道穿越高含水率黄土地层极易引发掌子面涌泥失稳、支护沉降变形大等风险,施工掘进难度大,进度极为缓慢。为解决高速铁路隧道穿越富水黄土地层时出现的各种病害,依托在建宝兰客专上庄隧道施工中的实际情况,采用帷幕注浆加固技术对高含水率黄土地层进行治理,通过超前地质预报地质雷达法及数值模拟等方法对注浆加固效果进行详细评价。结果表明:注浆加固体能够有效阻断地下水的涌渗流,浆液结石体固结强度高,围岩整体稳定性好,未发生涌水、涌泥、掉块、坍塌等现象;注浆后断面初期支护受力状况得到有效改善,隧道围岩塑性应变值得到有效控制。可见,帷幕注浆技术加固效果良好,对于快速、高效地通过高含水率黄土地层具有显著的工程价值。

Due to the tunnel passing through the loess stratum with high water content can easily increase the risk of the tunnel face instability characterized by the phenomenon of water inrush and burst mud,and large settlement deformation of supporting structure,such tunneling construction always has high difficulty with extremely slow excavation progress. In order to solve the various diseases of high-speed railway tunnel which across the watery loess strata,the paper selected the actual engineering background of Shangzhuang tunnel in Baolan passenger line under construction,the paper mainly uses the reinforcement methods of purdah infusion for the high water content loess stratum. And the grouting reinforcing effect has been also evaluated by the means of numerical simulation and advanced geological prediction using of geological radar. The results show that through the curtain grouting reinforcement technology,the groundwater seepage flow and water inrush can be effectively prevented,the grout solidification blocks have high consolidation strength,the tunnel surrounding rock is also with good stability,and no significant failure phenomena occur such as water burst,burst mud,slabbing of rock and collapsing. Through grouting,the strength performance of primary support has been improved,and the plastic strain value has been controlled. Therefore,the curtain grouting method has a has good effect in reinforcement application,which is of significant engineering application value for the tunnel construction passing through the loess stratum with high water content rapidly and highly efficiently.