Study On Bearing Capacity And Deformation Mechanism Of Cement-soil Mixing Pile With Concrete Core

The cement-soil mixing pile with concrete core is a new soil improvement method, it means that, a concrete core is plugged into cement-soil mixing pile. Concrete core pile and the cement-soil mixing pile undertake together vertical load. It appropriately combines the advantages of the precast concrete pile with the cement-soil mixing pile. The cement-soil mixing pile with concrete core forms a new reasonable structure of pile, it means that, the strength of core pile is more strong than the strength of round pile, therefore, the cement-soil mixing pile with concrete core takes advantage of property of concrete core pile and cement-soil mixing pile.This paper studies the cement-soil mixing pile with concrete core by experiment and by theory, analyzes the feature of load transferring using finite element method. Finite element program of non-linear analysis to pile is made and together with results of building test pile and model test pile, therefore, the feature of load transferring and deformation mechanism were deeply analyzed.The same type of cement-soil mixing pile with concrete core, concrete pile and cement-soil pile that means they have the same pile length and pile diameter is deeply analyzed by finite element program. We get the Q-S curve, the axis force of pile body curve, the stress of pile curve and the side and the end sharing load ratio of the pile curve by finite element program.With the help of the finite element program, the paper finds the relations between the pile's parameter and its bearing capacity and load transferring properties.According to the results of the tests and finite element program, the paper put forward the structure need of the cement-soil mixing pile with concrete core, gives the calculating formula of pile's bearing capacity. Finally, we draw a conclusion that the cement-soil mixing pile with concrete core will be used widely in Tianjin city zone by comparing with other piles in technology, speed, quality, and economy.