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As a common deep foundation, pile foundation has been widely applied in building field in china, which results from its characteristic: high capacity, good stability, small relatively foundation settlement, good seismic performance, and general application to a variety of complex geological conditions. Pile foundation’s cap is low, which bears mainly vertical loads. Super Load is passed to piles and soil through cap, which is effected by various factors, such as the nature of soil, setting of cap, the type and the setting of piles, which results in complex interaction between piles and soil. Therefore, studying further effects of various factors to pile-soil interaction in pile group system has practical significance and good social benefits.The dissertation introduced mechanism of pile-soil interaction. On the basis of conclusion on research methods of load-sharing ratio and its existing theory, studying methods and ideas are put forward.Three-dimensional model of piles-soil-raft is simulated by MARC program. Adopting elastic-plastic model of linear Drucker-Prager yield criterion, reasonable boundary condition, the dissertation analyzes the influence of various factors to load-sharing ratio between piles and soil in pile group system, such as load level, pile spacing, pile length, the number and soil parameters. Finally, a model test is simulated by MARC program, whose result is compared with the numerical results to testify the feasibility of the method.Through the study, some useful conclusions for practical engineering design have been obtained.
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