Dem Simulations Of Liquefaction And Postliquefaction Behaviour Of Granular Materials

This paper illustrates the potential of DEM simulations to capture the behaviour of liquefaction and post liquefaction behaviour of granular materials. A series of strain controlled undrained cyclic triaxial test has been carried out on isotropically compressed assembly of spheres. The undrained tests have been simulated by maintaining a constant volume condition of the sample throughout the cyclic triaxial tests. The pore water pressure has been computed considering the difference of mean pressure between the undrained (effective) and drained (total) stress path during strain controlled cyclic triaxial tests. As observed from the results, numerical simulation using DEM has captured liquefaction and pore water pressure generation and post liquefaction behaviour very similar to the experimental results. Further, evolution of micromechanical parameters such as average coordination number during cyclic triaxial loading has also been reported and discussed.