EXPERIMENTAL STUDY ON CONSTRUCTION TECHNIQUE OF CFG PILE COMPOSITE FOUNDATION AND ITS BEARING CHARACTERISTICS IN LACUSTRINE SEDIMENTARY STRATA

By field test and inner test, the construction technique of CFG pile foundation and control parameters relating to construction are thoroughly studied. CFG pile by long auger is proved to be more appropriate for reinforcing soft foundation of passenger special line of railway than other methods for its good quality and rapidity of pile formation. Low strain reflection method, core drilling method and load test are used not only to analyze the quality of CFG piles but also to evaluate the effects of CFG piles in reinforcing soft ground. The research results show that the way to reinforce the soft foundation of passenger special line of railway can better meet the requirement of bearing capacity and deformation value as well as better control post-construction settlement. All of the results can be used to direct the construction of CFG pie composite foundation of other similar engineering projects.