Abstract: The proposed refinery site in Yunnan Province is undergone the cut and fill in the mountain area. The heterogeneous of the subsurface soils prevent the shallow foundation for special equipment even after the dynamic compaction. Due to the large dimensions and magnitude of both lateral and vertical loads, the cast-in-place reinforced concrete piles are selected to support this structure. The axial static loading tests are performed at three representative locations in order to optimize the pile design. This paper presents the results of loading tests. The influence of the surrounding soil on the axial capacity and the stress distribution along the pile shaft are discussed.

Key words: cast-in-place concrete piles； side friction, end resistance；ultimate axial capacity； characteristic value for axial capacity