Research methods : Based on the characteristics of the retaining wall and foundation conditions of passenger dedicated line, the basic parameters are calculated with calculation theory for composite foundation, and the layout of piles and reinforcing depth are verified with compression stress diffusion theory and solid foundation theory according to the computing results.
Research results: Based on the characteristics of gravity retaining wall and new collapsible loess, and computing results of composite foundation, the comparison of the reinforcing depth with solid foundation theory with that with compression stress diffusion is made in order to provide the references to improvement of stability of retaining wall for passenger dedicated line and deciding the reinforcing depth made by solid foundation theory.
Research conclusions: The rational computing method of reinforcing depth should be selected according to the requirement of reliability of retaining wall in the course of design and reinforcement of foundation. The solid foundation computing theory should be adopted when it is necessary to largely enhance the bearing capacity of gravity retaining wall for passenger dedicated line.
2007, Vol. 24 
