Centrifuge test and numerical simulation of wave-seabed-structure interaction
Wu Leiye1,2 Zhu Bin1,2 Chen Renpeng1,2 Kong Deqiong1,3
1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of the Ministry of Education, Zhejiang University, Hangzhou 310058, China;
2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
3.Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China
Abstract：The wave-seabed-structure interaction under cyclic wave loadings are studied by both centrifuge model tests and numerical analyses. The model tests were carried out by means of a wave-generator in a beam centrifuge ZJU400 at Zhejiang University, which is capable of reproducing the progressive nature of pore pressure accumulation in sandy seabed under wave action. The numerical model was established based on Biot’s consolidation theory, with a cyclic mobility constitutive model being implemented to describe the pre- and post-liquefaction behavior of sandy soil. Validation was achieved in terms of pore pressure response before the presentation of a detailed parametric study on the dynamic response of soil around submarine buried pipelines under wave action, with different soil properties being examined. The results show that the existence of the pipeline considerably accelerates the accumulation of the pore pressure at its top and side. The floating behavior of the pipeline under wave action was also investigated, with the effect of the weakening of soil and the wave-induced buoyancy being highlighted.
