| We all know that composite ground has been widely used in engineering because it can enhance bearing capacity of natural ground with relatively small cost. However, further research is necessary as theoretical study is far behind practice and precise theory and design method are still not available. The following questions are discussed in this paper:1. The vertical loading on semi-rigid pile composite foundation is beared by co-actionamong pile capushion, pile and the earth. By using of ANSYS FEM program, the characteristics of single pile are studied with pile axis stress , pile-soil stress ratio and settlement changed by factors such as loading, thickness of the earth, length of pile, and etc. Futhermore, group piles and single pile composite foundation which analysed by finite element analysis is expounded in this paper.2. Compared with pile foundation, settlement of composite foundation is much greater though it can control distortion of foundation better as rigidity pile composite foundation. semi-rigid pile composite foundation adapt the double-control design method which is based on the theory of settlement control can satisfy intensity and distortion, is more rigorous and reasonable than that based on the theory of bearing capacity. This paper analyse practical value of the calculating method of composite modulus and point out insufficiency of the formula by combining with engineering examples.3. This paper also put forward some experiences of design and construction by with engineering examples.
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