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连拱隧道特殊的结构型式导致了连拱隧道在渗漏水防治方面存在较大的困难,对大跨度的连拱隧道而言,这种现象尤为突出。要研究地下水在连拱隧道中的渗漏,首先要研究连拱隧道施工过程(开挖步骤)对渗流场的影响。文中对南京九华山大跨度双连拱隧道所在工程区的工程地质及水文地质特征进行了分析,根据场地岩体的基本性质,采用二维渗流分析方法,对九华山隧道在不同开挖(加固)步骤中的渗流场特征进行了详细的研究,得出在不同开挖步骤中隧道围岩的渗透压力及渗透梯度,指出渗透压力及渗流速度较大的部位,为隧道及时加固以及防排水设计提供理论基础。
The special structure of multi-arch tunnel led to the multi-arch tunnel in seepage prevention and control of water there are major difficulties, for large-span multi-arch tunnel, this phenomenon is particularly prominent. To study the seepage of groundwater in a multi-arch tunnel, we must first study the impact of the multi-arch tunnel construction process (excavation steps) on the seepage field. In this paper, the engineering geology and hydrogeological features of the engineering area of Jiuhuashan long-span double-arch tunnel in Nanjing are analyzed. According to the basic properties of site rock mass, two-dimensional seepage flow analysis method is used to analyze the geotechnical and hydrogeological features of Jiuhuashan tunnel in different excavation ), The characteristics of seepage field are studied in detail, and the infiltration pressure and infiltration gradient of tunnel surrounding rock in different excavation steps are obtained. The site with high seepage pressure and seepage velocity is pointed out for the timely reinforcement of the tunnel and the design of drainage and drainage Provide a theoretical basis.