Quantitative Analysis On Pile Foudation's Perfection In Heterogeneous Soils

The integrity of pile tests is such an important problem that it attracts the entire engineering field and many investigators' attention. Now theory about the qualitative analysis of pile test has come to maturity, however, little progress has been made on the quantitative analysis due to many factors. In the practical project, it is necessary to classify the sorts of various defective pile. So the quantitative analysis of defective piles appears to be very essential.In this paper it is theoretically studied that how to realize the quantitative analysis of defective piles in heterogeneous soil. And a program has been compiled according to the expression of quantitative analysis, by which the degree of integrity can be calculated. Tests of model pile are also done to verify the accuracy of the program. As follows are the main contents of this paper:Firstly, a Matlab program has been worked out according to the response model of integrate and defective pile in time zone ;Secondly, the most important factor that affects the curve of velocity is obtained through analyzing the curve of velocity response. So a new method is presented(equivalent damping of pile lateral damping) to realize the analysis of integrity pile in soil. In this method, the coefficient of the damping is calculated by the length ratio of each pile in a soil layer to the whole pile in the heterogeneous soil. And through much calculation by use of Matlab program, the equivalent damping in the heterogeneous soil is proved to be correct. So the quantitative analysis of defective pile in the heterogeneous soil is transformed into a question in one soil layer, which simplified the problem greatly. Through the equivalent damping, the relationship between the degree of defects and ratio of amplitude of incidence and reflective is put forward. So the quantitative analysis of defective piles in heterogeneous soil become practicable. Thirdly, a program of Matlab was made according to the above expressions of quantitative analysis. If the lateral damping of pile , amplitude of incidence and reflective, and the corresponding time are input, the degree of the defective pile can be calculated automatically.Finally, the tests of model pile are done to prove the accuracy of quantitative analysis theory.