Tasmania Chapter

Simplified models for wave-induced dynamic soil response around marine infrastructures.

Professor Dong-Sheng Jeng

Abstract

The evaluation of the wave-induced dynamic soil response is particularly important for coastal and geotechnical engineers involved in the design of foundation of marine infrastructures. Seabed instability such as liquefaction occurs because the cyclic loading and the resultant interaction between the pore fluid and soil particles. This seminar will first introduce the analytical approximation for the wave-induced accumulation of pore pressures in marine sediments and the resultant liquefaction potential. The mathematical model including Biot’s formulations will be outlined and the applicable range of the analytical approximation will be clarified. With the analytical solution, a simplified approximation for the wave-induced liquefaction will be presented for engineering practice.

The second component of the seminar will introduce the new development of simplified but applicable numerical models for the wave-induced liquefaction around marine infrastructure, including several new features in the models. Numerical examples will be given for two common marine infrastructures such as breakwaters and pipeline. Based on the parametric study, a simplified model for the design of backfilled height for protection of pipelines is proposed for possible engineering applications.

About Professor Dong-Sheng Jeng

Dong joined Griffith University in July 2013 to take up the position of Professor of Civil Engineering. He completed his PhD at the University of Western Australia (UWA) in 1997. He spent 2 year as a Postdoctoral Research Associate at the ARC Special Research Centre for Offshore Foundation Systems at UWA with Professor Mark Randolph, and was lecturer and senior lecturer in School of Engineering, Griffith University (1999-2004), and was senior lecturer and Associate Professor at School of Civil Engineering, University of Sydney (2004-2007), and was NRP Chair Professor of Civil Engineering at University of Dundee (2007-2013).  Professor Jeng has wide research interests covering offshore geotechnics, coastal engineering, groundwater hydraulics, offshore wind energy, application of artificial neural network and plant science. He has served as editor/associate editor/editorial board in over 10 international journals cross various disciplines. He is one of world leading experts in the wave-seabed-structure interactions.

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