研究目的：客运专线铁路隧道的建设在我国尚属首次，其断而选型和结构设计无成熟经验可以参考，原设计的时速250 km客运专线隧道衬砌断而和时速350 km客运专线隧道衬砌断而有不足之处。为满足客运专线隧道建设的需要，需要对客运专线隧道断而形式和结构进行优化设计研究。
研究方法：广泛调研国外高速铁路隧道设计方案和施工经验，从隧道结构受力条件、排水系统布设及工程量大小等方而进行多方案比选研究。
研究结果：合理选定了时速250 km客运专线隧道衬砌断而和时速350 km客运专线隧道衬砌断而形式，进一步优化了衬砌结构设计。
研究结论：通过客运专线隧道断而研究和优化设计工作，克服了原设计客运专线铁路隧道衬砌断而的缺点。优化后的隧道衬砌断而具有受力更加合理、救援通道的使用更加方便、减少了隧道断而工程数量等优点。
Research purposes: As railway tunnels for passenger dedicated railway line will be built in China for the first time, so there are no mature experiences to learn for type selection and structural design of tunnel section. There are still rooms for improvements to the lining sections of tunnel designed previously for passenger dedicated railway lines of 250 km/h and 350 km/h. Therefore, it is necessary to make research on optimum design of section form and structure of tunnel for passenger dedicated railway line in order to meet the requirements for construction of passenger dedicated railway line.
Research methods: The wide investigation is made on the tunnel design program and construction experience of foreign high-speed railway lines and the comparison and research are made for compressed conditions of tunnel structure, layout of drainage system and amount of construction work in some programs.
Research results: The lining section forms of tunnel are decided rationally for the passenger dedicated railway lines of 250 km/h and 350 km/h, and the structural design of tunnel lining has been further optimized.
Research conclusions: The defects in previous design made for passenger dedicated railway line have been overcome through making research and doing optimum design of lining section of tunnel for passenger dedicated railway line. After optimum design, the compressed situation of lining section of tunnel is more rational, it is more easy to use rescue passageway and the amount of construction work can be reduced.
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