Abstract:

In the study of double reinforced composite ground, the settlements of pile and soil of composite ground are different, which results in vertical relative displacement in fill column and change in stress state. The shear displacement method is adopted to analyze the strain and stress of horizontal reinforcement. Equations about pile-soil stress ratio and distance of pile sticking into embankment are deduced from analyzing the vertical mechanical equilibrium of soil unit, in consideration of the influence of soil mechanical properties (c, ) and horizontal reinforcement. Finally, when the equations are used to analyze the practical project, its feasibility is proved by the reasonable agreement between the calculated and the measured values; meanwhile, all kinds of factors that affected pile-soil stress ratio are analyzed systematically; and some rules are obtained.

Key words: composite ground, double reinforcement, shear displacement method, pile-soil stress ratio