Experimental and Numerical Analysis of XCC Pile-Geogrid Foundation for Existing Expressway Under Traffic Load

摘要

A series of dynamic large-scale model tests and three-dimensional finite element analyses for XCC pile composite foundation are conducted to investigate the dynamic behavior and the settlement of XCC pile composite foundation of existing expressway under traffic load. The test and FE results are presented in the variation of dynamic stress, distributions of skin friction, deviator stress, and the settlement of XCC pile composite foundation. The test results reveal the transfer mechanism of dynamic stress, and a linear relationship between the transferred stress and traffic load is found. Also, XCC piles can improve the stability of composite foundation because of lower neutral point and less sensibility to the traffic load. The distribution characteristics of deviator stress in the horizontal and vertical direction have been found by the numerical simulation. A modified model for predicting the traffic-load-induced settlement of XCC pile composite foundation is proposed. The asymmetric settlement of XCC pile composite foundation is revealed.