厦门市第二西通道陆域段工程沿厦门岛内繁忙干道兴湖路布设，结构形式多样，安全风险较高。对厦门市第二西通道陆域段工程中浅埋暗挖双连拱隧道、深大明挖基坑、隧道上跨既有地铁隧道等施工中的关键技术问题进行研究。主要研究和结论如下：1）浅埋暗挖双连拱隧道埋深小、跨度大、地质软弱、保持地面交通，控制沉降是施工的关键技术所在。从三导洞工况理论分析看，设计支护和开挖方法是合理可行的，施工中还应结合实际优化具体支护参数，注重受力体系转换环节，加强监控量测，用信息化指导施工。2）深大明挖基坑，关键是要确保基坑支护体系变形受控，结构安全，基坑防水有效，保证基坑和周边建筑物的安全，尤其要注重复合地层组合式围护体系的整体稳定。3）隧道上跨既有地铁隧道，施工中要采取防既有地铁轨道上浮的工程措施，同时加强地铁轨道监控量测，制定好轨道调整预案，保证地铁轨道线型符合规范要求。

The structural mode of land section of Xiamen Second West Passage varies and it is highly risky. In this paper, the construction technologies for shallow mined doublearch tunnel, large and deep opencut foundation pit and tunnel crossing above existing Metro tunnel are discussed. Some conclusions are drawn as follows: 1) The shallow mined doublearch tunnel has many disadvantages, such as shallow cover, large span, weak rock and complex conditions on ground; and the settlement control is the key. The design supporting and construction method are feasible according to theoretical calculation results. A series of technologies, i.e. supporting parameter optimization, paying attention to stress system conversion, monitoring strengthening and informatized construction, should be adopted. 2) The keys to large and deep foundation pits are deformation control of supporting structure, structural safety, waterproofing, safety of surrounding buildings and stability of combined retaining system of complex strata. 3) The uplifting of existing Metro tunnel induced by abovecrossing tunnel construction can not be avoided. It has any influence on existing tunnel structure, but it has influence on tunnel tracks. As a result, antiuplifting technology, monitoring and prepared countermeasures should be adopted.