Calculation for Pile-soil Stress Ratio in Crush Stone Pile Composition

After analyzing the general calculation methods of pile-soil stress ratio and pointing out their defects,this paper derived a new formula to calculate the stress-strain of pile and soil in loading process by using the theory of round-hole expansion and the harmony condition.Then,considering the stress of soil changes by different pile arrangement,a concept of pile influence radius was put forward,and the formula of pile-soil stress ratio to pile composition with different pile arrangement was derived.Compared with the general methods,our method can take into account the mutual action between pile and soil,and the overlapping effect caused by pile arrangement.A laboratory model test based on similarity theory was conducted,and the error was below 12%,which demonstrated that our method could satisfy the engineering requirement.