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为了掌握地铁联络通道冻结施工过程中,冻土帷幕不同位置发生渗漏时,渗流场和位移场的变化规律,以南京地铁二号线莫愁湖站～汉中门站区间联络通道及泵房水平冻结法施工为研究背景,采用有限元数值方法,对冻土帷幕中渗漏分别发生在拱顶、拱角、底角处的三种情况进行模拟,研究了渗流对冻土结构的影响,即渗流场、垂直位移场、水平位移场及地表变形分析,得出对渗漏点进行加固的最低期限,避免由此产生的工程事故,为联络通道冻结法施工提供理论依据。
In order to grasp the variation law of seepage field and displacement field during the construction of subway contact channel during the freezing construction, when the percolation of permafrost is occurring in different locations, taking the contact channels of Mokuhu Station ~ Hanzhong Gate Station of Nanjing Metro Line 2 and the pump room level The construction of freezing method is used as the research background. The finite element method is used to simulate the seepage, vortex angle and bottom angle of frozen soil curtain respectively. The effects of seepage on frozen soil structure are studied, that is, Seepage field, vertical displacement field, horizontal displacement field and surface deformation analysis, and draw the minimum period for strengthening the leakage point to avoid the resulting engineering accident, providing a theoretical basis for the construction of contact channel freezing method.