盾构法施工被广泛应用于城市轨道交通建设中,盾构区间隧道不可避免会存在穿越既有桥梁的情况;而穿越既有桥梁时必须要考虑施工过程桥梁墩顶的位移情况,确保桥梁运行安全.以宁波市轨道交通4号线金达路站—钱湖大道站区间下穿杭深线、北环线鄞县特大桥工程为例,利用Plaxis 3D有限元软件对盾构施工过程进行了数值模拟分析,对不同施工工况下桥梁墩顶的变形情况进行了研究,得到了高铁桥梁桥墩横桥向、顺桥向及垂向位移,并对该设计方案进行了技术分析和安全评估.%Shield tunneling method is widely used in the construction of urban rail transit. It is inevitable that the shield tunnels will pass through the existing bridges;meanwhile, the pier displacement in construction should be taken into consideration to maintain safe operation of the bridge. Taking Ningbo rail transit line 4 Jinda Road Station to Qianhu Road Station interval under cross bridge of the Hangshen line and north link of Yinxian as an example,this paper analyzed the process of shield tunnel construction by using the Plaxis 3D finite element soft-ware in numerical simulation and studied the deformation on the top of the bridge piers under different construc-tion conditions,and the deformation and displacement of high-speed railway bridge pier were obtained. The technical analysis and safety assessment of the design scheme were carried out.
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