某跨海地铁隧道总体技术方案研究

跨海隧道由于其工程环境的特殊性,施工过程往往风险高、难度大,为在项目前期尽快稳定总体技术方案,确定科学、合理、经济、安全的施工方法,为工程的推进及后续阶段决策创造条件,以厦门地铁3号线超长跨海区间为例,采用对比分析法,从地质、工期、造价等方面研究工程总体方案,并结合施工风险、疏散救援等对不同方案断面深入分析,得出最优方...

Study on the Construction Method and Section Selection Scheme of a Cross-sea Subway Tunnel

The cross-sea tunnel is often risky and difficult due to its particularity of the engineering environment.In order to stabilize the construction plan and section in the early stage of the project,determine scientific,reasonable,economical and safe construction methods,and create conditions for the advancement of the project and the subsequent stage of decision-making,this article took the ultra-long sea-crossing section of Xiamen Metro Line 3 as an example,adopted a comparative analysis method and analyzed the adaptability of the construction method from the aspects of geology,construction period and cost.On the basis of determining feasible construction methods,combined with construction risks,evacuation and rescue of the structure sections of different construction methods,in-depth research were conducted for a better solution.Research showed that the suitable construction method for the project was mining method plus shield boring method and full shield boring method;considering the construction risk,ventilation rescue,construction period,cost,hard rock excavation length and other factors,the mining method plus shield boring method were recommended.The full shield boring method were recommended with the 8.5 m shield tunneling scheme.Further combining the plane line position factors,the combined construction method was recommended,which was consistent with the actual construction method.The results of the research could provide a certain reference for the research of other super-long sea area subway tunnel engineering schemes.