In this paper, considering the special field with hydraulic fill sand in upper soil layer and fine sand in the lower soil, we adopt straight piles and DX piles in foundation of LNG storage tanks; a series of self-balanced load tests for piles are conducted. The purpose is to determine the ultimate bearing capacities and settlement of piles, analyze its load transfer mechanism, and study the distribution and development of the skin friction resistances and tip resistances. Comparing DX piles with straight piles, we find that DX piles are superior in ultimate bearing capacities and settlement; at the same time, the length of DX piles can be reduced apparently.

贺德新（1955—），男，北京市人，高级工程师，长期从事桩基研究，DX桩技术发明人