结合某大跨度城市交通隧道建设,通过二维弹塑性有限元数值模拟,对大跨度隧道施工中采用单侧壁导坑法时，导坑断面形状及大小对隧道地表沉降、拱顶沉降、仰拱隆起及支护受力的影响进行了研究,为隧道设计和施工提供了科学依据。

Taking the construction of a largespan urban traffic tunnel as example, for which single side drift method is adopted, the paper studies on the effects of different crosssection shapes and dimensions of side drifts on the ground surface subsidence, crown settlement, invert heaving and forces undertaken by the reinforcement structures by means of 2D elasticplastic finite element numerical simulations, which can provide basis for the design and construction of similar tunnels in the future.