Numerical Analysis of Wave-Induced Liquefaction around Buried Pipeline

This extended abstract presents the numerical solutions from the Finite Element analyses based on a wave flume test in order to investigate the instability of a buried marine pipeline due to wave-induced liquefaction. A soil model based on the Generalised Plasticity Concept namely Pastor-Zienkiewicz Model Mark-III (PZ3) implemented in a Finite element program namely SWANDYNE II is used to predict the behaviour of a seabed subjected by a two-dimensional progressive wave system. The verification of the finite element program and the validation of PZ3 model in simulating the progressive nature of wave induced liquefaction on seabed were performed by Vun et al. (2003). The numerical analyses successfully reproduced most of the experimental findings from the wave flume tests conducted by Teh et al. (2004) and Sumer et al. (2004). The effects of the pipe and the trench geometries, the wave condition and the soil parameters on the liquefaction potential of the soil around a buried marine pipeline are studied and presented in this paper