The proposed additional second line of Changbai railway,starting from Changchun North Station and ending at Baicheng Station,is 329.8Km long.It will be connected to the Harbin-Dalian high-speed railway with a bridge at Cui-jiayingzi block post.At present,Harbin-Dalian high-speed railway,a line with its bridges laid on ballastless track,has opened to traffic.A high-speed railway bridge on ballastless track demands high smoothness and stability,and it has a strict requirement on the deformation and subsidence of its substructure.Taking the proposed Changbai railway parallel existing Harbin-Dalian high-speed railway as the study case,a numerical analysis model of soil and bridge structure,u-sing large finite element software of ABAQUS,was established to give comparison and analysis on the deformation re-sponse of Harbin-Dalian high-speed railway bridge in five line spacing,i.e.10 m,15 m,20 m,25 m,30 m.In addi-tion,further study of the influence on Harbin-Dalian railway high-speed railway in different construction stages from the proposed Changbai railway is carried out.Corresponding conclusion is drawn through an analysis of massive numerical simulation,which may provide reference for selection of numerical simulation and line spacing for similar engineering.%拟建长白线增建二线，起自长春北站，终至白城站，线路长度为329.8 km。长白铁路于崔家营子线路所以桥梁形式引入至既有哈大高速铁路。目前，哈大高速铁路已通车运营，全线桥梁采用无砟轨道，引入并行范围哈大高速铁路为桥梁。高速铁路无砟轨道桥梁，要求轨道结构必须具有高稳定性和平顺性，其对线下结构物的变形和沉降要求非常严格。文章以拟建长白铁路并行既有哈大高速铁路工程为背景，采用ABAQUS大型有限元软件建立土体与桥梁结构的数值分析模型，分别对10 m、15 m、20 m、25 m、30 m 5种线间距情况下，对哈大高速铁路桥梁的变形响应进行对比分析。此外，还重点研究了拟建铁路桥梁在不同施工阶段对哈大高速铁路的影响。通过大量的数值模拟分析，得出相关结论，为同类工程的数值仿真模拟及合理线间距选择提供参考。
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