Microscopic Mechanism Analysis on Liquefaction of Dredged Silty Sand in Land Reclamation Based on Discrete Element Method

Cyclic consolidation-undrained triaxial tests were performed to investigate the liquefaction behavior of dredged silty sand in land reclamation. The liquefaction behavior of dredged silty sand in the triaxial tests was simulated using discrete element method. Constant volumetric method and initial liquefaction standard were introduced in the simulations. The micro-parameters of dredged silty sand were inversed. The liquefaction micro-mechanism of dredged silty sand was analyzed based on the numerical simulations. The pore water pressure of samples reached effective consolidation pressure and average coordination number decreased quickly when the initial liquefaction was reached.