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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。
In order to ensure the normal construction of the tunnel and ensure the operation safety in the future, the ABAQUS numerical analysis software was used to establish whether to consider the model of fluid-structure interaction and analyze the different working conditions According to the mechanics characteristics of the lining, the calculation shows that the maximum total stress of tunnel lining increases by 52.15% and the maximum bending moment of liner increases by 75.4% due to the seepage. In view of that the influence of gushing water on the mechanical characteristics of the tunnel is great, then the comparison and selection of gushing water treatment measures are made according to the actual conditions of the tunnel. The treatment measures of gushing hole combined with radial grouting are selected. The thickness of grouting ring and the penetration of grouting material The results show that when the thickness of grouting layer is 5 ~ 7 m, the construction effect is better when the permeability coefficient of grouting material is 30 ~ 50 times of the surrounding rock. The analysis results effectively guide the construction, which can provide reference for similar projects.