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Abstract Nine groups of viaduct pile foundations are located in the vicinity of Xicun station of Guangzhou metro which is constructed by subsurface excavation method. The minimum clear distance is 2.30 m between the tunnel of Xicun station and pile XJ33. To ensure the use safety of the viaduct，the least squares principle and finite difference method are used to study the influential partition of the pile foundations. The outcome of the influential partition is used for classification of pile foundations. And the concentrated areas of pile foundation settlement of the various types of pile foundations are determined. These results are applied to present the program of reinforcement and the management level of monitoring and measurement of the various types of pile foundations. The results show that the influential partition of the viaduct pile foundation is divided into four regions because of the tunnel excavation of Xicun station. Accordingly，the pile foundations are divided into four categories. The concentrated area of pile foundation settlement of pile type A is 2.0D(D is the diameter of tunnel) section before tunnel face and 3.0D section after tunnel face，1.0D section before tunnel face and 3.0D section after tunnel face for pile type B，and 0.5D section before tunnel face and 2.0D section after tunnel face for pile type C. Nine groups of viaduct pile foundations belong to type A in the vicinity of Xicun station. XJ25，XJ32 and XJ34 are the dangerous piles. These results can effectively control the impact of tunnel construction in Xicun station of Guangzhou metro on the viaduct pile foundation，ensure the construction safety and obtain successful experience. This will provide references to other similar projects.
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Received: 27 November 2008
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