Abstract：Research purposes: There are many sections of bridge － tunnel connection in Changsha － Yuping section on Shanghai － Kunming passenger dedicated line because of topographic relief effect． Various of difficulties exist in design of bridge － tunnel connection，such as whether tunnel portal can accommodate bridge abutment and effectively relieve aerodynamic effect of tunnel portal，drainage of portal in lower point of tunnel，transition of cable channels between bridge and tunnel，whether retaining wall outside of tunnel can effectively work and construct safely，and so on． In order to resolve the problem that bridge and tunnel are difficult to be connected in Changsha － Yuping section on Shanghai － Kunming passenger dedicated line，the special study on bridge － tunnel connection technology need to be done．
Research conclusions: ( 1) In bridge － tunnel connection section in series，using enlarged cross － section and digging filling piles can effectively solve the problems that bridge abutment enters tunnel difficultly and aerodynamic effect exists in tunnel portal． ( 2) According to different portal types and lengths of open cut sections，excavation methods of bridge abutment pits are classified into two types: protection of digging filling piles and step － slope excavation behind the pit in bridge － tunnel docking connection section． ( 3) For the situation that retaining wall exists outside of the portal in bridge － tunnel docking connection section，the following two measures that pile foundation and joist are set under the retaining wall and the retaining wall is designed into anchor retaining wall，can solve the difficult problems that the retaining wall is unstable because of pit excavation． ( 4) By the measure that transition section is set in tunnel portal，cable channels can link smoothly in bridge － tunnel connection section． ( 5) Inspection well which is set in the lower tunnel portal，can effectively solve the drainage problem of tunnel．
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2011, Vol. 28 
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