某隧道断层区段流固耦合分析及涌水处治措施研究

针对泽雅隧道穿越F10断层破碎带区围岩破碎、涌水量大等问题,为保证隧道的正常施工,确保后期运营安全,采用ABAQUS数值分析软件建立是否考虑流固耦合的模型,分析不同工况下衬砌的力学特性,计算显示渗流的存在导致隧道衬砌最大总应力增加52.15%,衬砌最大弯矩增加75.4%。鉴于涌水对隧道力学特性影响较大,进而结合隧道实际情况进行涌水处治措施比选,选取泄水孔结合径向注浆的处治措施,并运用数值分析手段对注浆圈厚度和注浆材料渗透系数进行优化,计算结果显示注浆层厚度为5~7 m时,注浆材料渗透系数为围岩的30~50倍时施工效果较好。该分析结果有效指导了施工,可为类似工程提供参考。

Fluid Solid Coupling Analysis and Water Treatment Measures of a Tunnel in Fault Section

The numerical model is established with ABAQUS numerical analysis software to analyze the mechanical characteristics of the tunnel lining and determine whether the fluid solid coupling is required,with a view to the rock breaking and heavy water gushing where Zeya tunnel passes through F10 a fault section. The seepage causes the tunnel lining stress to increase totally by 52. 15% and an increase of 75. 4% lining moment. Based on thegreat impact of water surge on tunnel mechanical property and the actual situation of tunnel surge water,the drainage hole with ring radial grouting is applied and ring grouting thickness and grouting material permeability coefficient are optimized by means of numerical analysis. The results show that the grouting layer thickness of 5 ~ 7 m and grouting material permeability coefficient of 30 ~ 50 times of surrounding will have a better construction result. The analysis results can be used to guide construction and provide reference for similar projects.