Research on Influencing Factors of Bearing Characteristics of Cement-Soil Composite Piles in Soft Soil Foundations

Owing to its excellent performance in terms of bearing capacity， settlement control， and foundation stability， the cement-soil composite pile exhibits significant application potential in soft ground. To promote its engineering application，this study investigated the bearing characteristics of cement-soil composite piles in soft soil foundations. Taking the cement-soil composite piles applied in the soft soil foundations of a practical project as the research object， a finite element model considering the interface interaction among the core pile， the cement-soil layer， and the surrounding soil was established using ABAQUS software. The reliability of the model was verified by comparing the results of in-situ static load tests and numerical simulations. Based on the verified model， the bearing characteristics of the cement-soil composite pile were studied， and the effects of core pile section size， cement-soil thickness， and cement-soil strength on its bearing characteristics were further examined. The research results showed that： provided that the interface contact strength between the core pile and cement-soil was ensured， the cement-soil composite pile in soft soil foundations exhibited the mechanical characteristics of a friction pile when subjected to loads； increasing the core pile section size and cement-soil strength had a relatively small effect on the bearing capacity of the cement-soil composite pile， while increasing the cement-soil thickness effectively improved its bearing capacity； When the core pile section size was small and the cement-soil strength was low， the cement-soil composite pile was at risk of brittle failure at the interface between the core pile and cement-soil.