张麒. 2018: 岩溶隧道下穿高速公路诱发地层变形规律研究. 工程地质学报, 26(s1): 181-188. DOI: 10.13544/j.cnki.jeg.2018031
    引用本文: 张麒. 2018: 岩溶隧道下穿高速公路诱发地层变形规律研究. 工程地质学报, 26(s1): 181-188. DOI: 10.13544/j.cnki.jeg.2018031
    ZHANG Qi. 2018: RESEARCH ON LAWS OF STRATA DEFORMATION INDUCED BY EXCAVATION OF KARST TUNNEL BENEATH HIGHWAY. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 181-188. DOI: 10.13544/j.cnki.jeg.2018031
    Citation: ZHANG Qi. 2018: RESEARCH ON LAWS OF STRATA DEFORMATION INDUCED BY EXCAVATION OF KARST TUNNEL BENEATH HIGHWAY. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 181-188. DOI: 10.13544/j.cnki.jeg.2018031

    岩溶隧道下穿高速公路诱发地层变形规律研究

    RESEARCH ON LAWS OF STRATA DEFORMATION INDUCED BY EXCAVATION OF KARST TUNNEL BENEATH HIGHWAY

    • 摘要: 岩溶隧道下穿高速公路过程中,隧道开挖往往极易影响上覆填土路堤的稳定性,诱发地层及高速公路产生变形。本文以成都至贵阳铁路大方隧道下穿杭瑞高速为研究背景,依据各地层特点,建立了隧道下穿高速公路的地质模型,同时根据地表结构物的重要性,对现场监测区域进行了危险性等级划分,并针对岩溶特殊地质条件,揭示了岩溶隧道下穿公路过程产生的破坏机制,结合实际工程案例给出了相应的施工关键技术。最后依次对隧道洞口地表沉降,路面沉降变形以及路基分层沉降特点进行了分析,研究表明:沉降曲线呈反向抛物线特征,隧道边界向上正投影区域沉降值较大,远离隧道边界变形量较小。同时根据曲线变化趋势,对隧道下穿高速公路引起的路面沉降变形划分为3个阶段:初期微小变形阶段、中期变形剧增阶段和后期变形稳定阶段,整体来看,沉降变形均在允许范围内,论证了隧道支护参数的合理,最后总结了地层变形规律。研究成果可为今后类似下穿工程施工提供参考。

       

      Abstract: The stability of overlying land embankment was often influenced when a tunnel underpass the existing highway, which induced deformation of strata and highway. Based on the Dafang tunnel of Chengdu-Guiyang railway beneath expressway, the geological model of tunnel beneath highway was built based on the characteristics of the local layers. At the same time, according to the importance of the surface structure, the danger level was divided into the field monitoring area. According to the special geological conditions of karst, the damage mechanism of the road under karst tunnel was revealed. The corresponding construction key technology was given in combination with practical engineering cases. Finally, Settlement deformation characteristics of surface subsidence, road surface subsidence and subgrade layered settlement were analyzed. Research results show that subsidence curve has the characteristics of inverse parabola,the settlement value of the upward projection area of the tunnel boundary was larger, the deformation away from the boundary of the tunnel was smaller. At the same time, the subsidence curve characteristics of tunnel underpass the highway was divided into three stages:the initial stage of small deformation, medium-term accelerated deformation stage and late deformation stable stage. On the whole, settlement deformation was within the allowable range, demonstration of tunnel support parameters was reasonable. The research results can provide similar reference for the construction of the project below in the future.

       

    /

    返回文章
    返回