| With developing of modernization process and traffic network, there is more and more possibility to encounter existent constructions year after year. In tunnel project constraction, rapid expanding of underground engineering brings on more possibility of new structure colliding with old structure. Format of colliding is more and more complex. It's necessary to study small clear-span tunnel simultaneous construction scheme in new underground project.The thesis bases on guangtouling tunnel contructiing technical scheme in Wenzhou-Fuzhou passenger transport railway line which under-crossed Tongzhou-Sanya highway. Influence of difference excavating schemes and constrcting methods has been researched using universal finite element analyze software ANSYS. Feasibility of scheduled constrcting methods has been validated by pilot plant. Comprehensive inspect and test architecture bring into scheme realization process. Structure security had been ensured under 3.24m vertical interval between railway new tunnel and highway old tunnel.Some main conclusion and achievement are attained by theory study and engineering practice:â‘ Three-dimensional model is established to realize finite element analysis about excavating support and protect conditions of Guantouling new railway tunnel, which crosses with old highway tunnel. Analysis result shows that wall rock's displacement and internal force are sensitiveless with excavating mode, and consistent with experience analysis and project practice. Analysis result is useful for flexible choosing excavating scheme. The construction process control's emphases is exploding vibrancy effect.â‘¡Based on abundant Guantouling tunnel project actual measuring data, regression procedure and analysis is put forward. Using actual measuring data support, some support and protect modes were changed. All the work is used for creating conditions to satisfy safe and rapid passing in crosse section.
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