Numerical Simulation of Soil Compaction Effect During Penetration Process of Jacked Piles in Layered Sandy Foundations
To investigate the delamination effect of soil around piles caused by penetration of jacked piles into layered sand foundations,a numerical model of soil compaction effect during penetration process of jacked piles in layered sandy foundations was established based on coupled Eulerian-Lagrangian method and a critical state constitutive model of sand considering particle breakage named SIMSAND-Br model.On the basis of existing triaxial drainage shear test data,parameters of SIMSAND-Br model were corrected and used to simulate existing centrifuge pile foundation penetration model test.Reliability of the established model was verified by comparing simulation results with existing centrifuge pile foun-dation penetration model test data.The verified established model was used to simulate and analyze penetration resistance and soil displacement of jacked piles in layered sandy foundations.The results show that the simulation results of pene-tration resistance and soil displacement of jacked piles are consistent with the results of the existing centrifuge pile foun-dation penetration model test.The established model can be used to simulate and analyze the soil compaction effect of jacked pile penetration process in layered sandy foundations.Soil delamination has a great influence on the penetration resistance and the vertical displacement of jacked piles in a certain range near the soil delamination interface.The diameter of the affected area is about 4 to 10 times of the pile diameter,and the influence on the horizontal displacement is very small.The size of the affected area changes significantly with the relative density of sand and the distance from the delami-nation interface.
万方数据
维普
