Deformation Research Of Composite Foundation Based On Layering Settlement Tests

In recent decades, composite foundation theory and technology developed fast, now composite foundation is widely used in various types of engineering. The composite foundation forms is various, CFG pile composite foundation which because of its economic, convenient for construction, environment-fiendly, it is widely used in engineering. Although the foundation theoretical is researched more and composite foundation technology has made great progress present, however, due to the complexity of composite foundation and different composite foundation have different influence factors, people know little of composite foundation, especially the deformation of composite foundation which still mainly based on experience. Therefore, to promote the development of composite foundation, we need further research about deformation of composite foundation.Through a layer settlement test instance of a CFG pile composite foundation, this paper research the deformation of composite foundation. First, summarized existed deformation calculation methods of composite foundation, used these deformation methods calculate the engineering of test, and calculatied the reinforcement area and the underlying layer deformation respectively.The methods include the standard method, the modulus method, the stress correction factor methods, the Es correction method, the compression method of pile, the numerical method and so on. This paper also used numerical methods simulate the experimental engineering, and got more detailed data of deformation. This paper analyze the variety of calculation methods,numerical methods and experimental results, from the reinforced area, underlying layer and total deformation three aspects. The standard method, Ep method, numerical calculate results as the ratio of reinforced area and under lying Deformation in total deformation is close to the test results, the result of Standard method is the maximum one, andfollowed by Ep method and numerical simulation results,after adjusted by the same Deformation factor of experienced.In this paper, through the deformation calculation and simulation,researched the depth of composite foundation deformation, pile-soil ratio of stress, pressure diffusion angle, and focus on the deformation experience factor, extension its scope to 0.08 when modulus of compressibility is 28.5MPa.