Computation And Analysis Of CFG Pile Composite Foundation

Ground improvement is a very vivid research field in civil engineering at present. The theory of composite foundation is greatly developed in recent more than ten years. Because the material strength and effect are not same for the different reinforced pile body installed in composite foundation, the work mechanism of all kinds of composite foundation are different. It leads to that the computation methods of bearing capacity and settlement of all kinds of composite foundation are different.The bearing capacity characteristics and design methods of composite foundation are systematically studied in this dissertation .At first, the computation formulas of the ultimate bearing capacity of the granular material pile are discussed . the modified passive earth pressure method is put forward, it make the results more reasonable. Based on engineering practice and experiment, considering the lateral interaction of the pile and soil between piles, the computation formula of bearing capacity of granular material pile is proposed. the computation method of bearing capacity of granular material pile is discussed, the determining method of pile body modulus of deformation of granular material pile is given. By the parametric potential energy variational principle, the analytic solution of expansion problem of granular material pile is obtained. the common design methods of grammar material pile composite foundation are discussed .Secondly, the paper has analyzed the mechanical properties of reinforced ground by means of medel test and the application of finite element analysis soft ware ANSYS. somebasic regularties of the loda distribution.deformation characters,and so on, has been gained,the between the length of pile and settlement are work out, whichprovide thereunder for optimization, then the optimization of CFG pile composite is done by means of ANSYS.At last, the design thought of rigid pile composite foundation is discussed . Based on the static load test load of flyash concrete pile composite foundation with bearing plates of different dimension in soft soil region, the mobilization coefficient of the bearing capacity of soil. Between piles is determined. By the experiments of sand or gravel cushion with different thickness, along withengineering practice, the proper thickness of sand or gravel cushion is proposed in rigid pile composite foundation. The computation methods of bearing capacity? settlement and select of parameter in rigid pilesssss composite foundation design are discussed. The compound proportion tests of pile body material of flyash concrete pile are carried out. The construction technology of flyash concrete pile in soft soil region is studied. The probability characteristic of bearing capacity of rigid pile composite foundation is analyzed.