结合南京小红山客运站基坑支护工程,利用ABAQUS非线性有限元分析软件建立了双排桩+被动区土体加固、双排桩、单排桩+被动区土体加固、单排桩四种不同支护方式的基坑开挖计算模型,并进行了平面应变有限元数值分析计算.根据计算结果,从沉降变形和水平位移两个角度比较了四种不同支护方式对城际铁轨的保护效应,总结分析了双排桩支护及被动区土体加固的支护方式在控制基坑周围地表变形,保护城际铁轨方面相对于其他三种支护方式的优势,并简要分析了原因.%According to the foundation pit support engineering in Xiaohongshan passenger station of Nanjing, four different support models-double-row piles with reinforcing soil in passive areas, double-row piles, single-row piles with reinforcing soil in passive areas, single-row piles-are made to model the excavation of foundation pits by using nonlinear finite element analysis software ABAQUS with plain strain finite element method. A comparative analysis is further taken to analyze the different protective effects of the four different support models for inercity rail by using the computed results of settlement and horizontal displacement. Compared with other models, the advantages of the double-row piles with reinforcing soil in passive areas support structure in restricting the deformation of the ground around foundation pit and protecting inercity rail are concluded. Furthermore, the reasons for these advantages are also included in this article.
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