Abstract：Research purposes: Based on the examples，the ideas are expressed on the problems in the design and construction of double vault tunnel and extreme small space tunnel for the purposes of providing reference design of similar tunnels.
Research methods: The comprehensive introductions are given to the design and construction of Baiyunshan, Nanjing Metro, Hangzhou Jiefanglu and Xiaoyangshan tunnels and based on which the summary is made for the key points of design and construction of similar tunnels.
Research results: Nowadays the main means of design of tunnel still depends on the engineering experience and calculation. The basis for quantitative analysis of design of tunnel can be obtained by learning the previous experience and doing calculations and the feed back of information on construction can make the design more perfect.
Research Conclusions: Application of the technology for double vault tunnel and extreme small space tunnel can shorten midway between tracks and reduce the quantities of requisition land and high side slope at the tunnel portal and work of filling soil outside the tunnel. The small guide pipe and large pipe shed for support in advance applied in Baiyunshan Tunnel made good effects on protection of wall rock during small blast, so the wall rock can set function of self bearing capacity. In the course of excavation under track, the works of fastening rail and patrol should be done well for ensuring operation safety of railway. In the courses of construction of double vault tunnel and extreme small space tunnel , the construction monitoring should be conducted.
2007, Vol. 24 
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