The safety assessment model of the new highway beneath the intercity rail was conducted u-sing the famous geotechnical FEM software PLAXIS.A refined finite element model for new highway beneath the intercity rail was set up and composite pile foundation was studied.The forces and the displacements of the pier of the intercity rail were calculated during the road construction and opera-tion,the rules of the mechanical characteristics and the displacements were summarized.The safety e-valuation conclusions were obtained.%利用 Plaxis 岩土工程有限元软件对新建公路下穿城际铁路工程进行安全性评估。依据某新建公路下穿铁路交叉工程建立了精细化有限元模型，考虑桩土共同作用，分析新建道路的施工及运营对城际铁路既有桥墩基础的影响，得出安全性评价结论。结果表明，现有方案可行，能满足既有铁路的安全性要求。
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