中文摘要：

利用ANSYS有限元分析软件,依托重庆渝中区鹅岭隧道扩建工程,利用数值模拟方法,针对单侧扩建、双侧扩建、右侧小净距扩建,以及左侧小净距扩建四种扩建型式,分别计算分析了隧道结构的稳定性及围岩的受力和变形情况,并结合隧道所在区域的工程地质及交通等具体情况,在综合对比研究的基础上,确定了单侧扩建为该隧道的最佳扩建型式。通过理论与具体工程相结合,提出了地下空间扩建的合理结构型式,为类似工程在结构选型上提供了理论依据。

英文摘要：

Considering the extension project of Eling tunnel in Yuzhong district,Chongqing municipality,comparison analysis of four enlargement options was performed by using ANSYS： unilateral enlargement,bilateral enlargement,right-side enlargement with small spacing and left-side enlargement with small spacing.Structural stability and the behavior and deformations of surrounding rocks were analyzed respectively.Incorporating the local geological and traffic conditions,it has been concluded that the unilateral enlargement is the best option for the project.Comparison study results can be taken for reference by similar projects.