Dynamic Characteristics Of Soil-Cement Pile Composite Foundation Under Cyclic Loading

At present, the traffic facilities are building throughout the country.The soft soil has many unfavorable engineering characteristics such as high compression index, large settlement, and low strength. When construction was built in the soft soil area, even if the upper part load is not very large, subsoil also tend to produce a great deal of problem, such as lateral displacement, settlement and settlement difference. Because of the characteristics of convenience and significant economic benefits, the soil-cement pile composite foundation is widely used in the civil engineering, the hydraulic engineering, the transportation and port engineering and the environmental geotechnical engineering. Therefore, studying the soil-cement pile composite foundation working properties under cyclic loading is of great practical significance and economic benefits.The large finite element software ANSYS was utilized to establish the two-dimensional finite element model, simulate the static loading test of composite foundation with soil-cement pile; analyze the influence of the cushion thickness and modulus, the pile body modulus and the modulus of underlying stratum on bearing capacity of soil-cement piles composite foundation; compared the difference of bearing capacity between single-type-pile composite foundation and multi-type-pile composite foundation. By simulating the soil-pile composite foundation under subgrade, This article analyzed the influence of the cushion thickness, the cushion modulus, the pile body modulus, the pile length, the modulus of underlying stratum and reinforced layer, the modulus of subgrade on the soil-cement pile composite foundation working characteristics under cycle loading, summarized the changing rules of the settlement and pile-soil stress ratio of soil-cement pile composite foundation:1) In order to reduce the final settlement of soil-cement piles composite foundation, The most effective approach is to increase the modulus of underlying stratum and reinforced layer,followed by increasing cushion modulus, the pile body modulus and length, the modulus of subgrade; the effects of the cushion thickness on the final settlement of composite Foundation with soil-cement pile is not significant; And, the cyclic stress ratio is larger, the effect is more notable;2) For the pile-soil stress ratio of composite foundation, increasing the modulus of reinforced layer and the pile body modulus can significantly increase the pile-soil stress ratio of composite foundation, followed by cushion modulus and the modulus of subgrade, and then followed by the modulus of underlying stratum and pile length; Increasing the cushion thickness can reduce the pile-soil stress ratio.