波浪作用下单桩基础周围海床液化机制研究

Wave-induced seabed liquefaction around an inserted mono-pile foundation

建立波浪作用下单桩周围三维海床动力响应模型,考虑自重影响下的海床长时间固结过程。采用已有物理模型试验数据对模型进行验证,证实其具有较好的适用性。模拟波浪作用下单桩周围三维海床液化区域,通过定量分析超孔隙水压力和土体初始有效应力的变化,讨论单桩插入深度对海床液化的影响机制。研究表明,单桩插入深度发生变化时,土体初始有效应力对海床液化的影响要大于超孔隙水压力,且影响程度随着插入深度的增加而逐渐增大。

A 3D numerical model for wave-induced seabed response around mono-pile foundation is developed, which considers the long-time consolidation process of seabed. The present model is found to overall agree with the experimental tests available in the literatures. By model application, a 3D liquefaction zone around the mono-pile is simulated, and the effects of the pile inserted depth on the liquefaction are investigated. Quantitative analysis on excess pore pressure and initial soil effective stresses with various inserted depths is carried out to examine their role in seabed liquefaction. This study indicates ： 1） The influence of soil effective stresses on seabed liquefaction around an inserted pile is larger than that of the excess pore pressure, and 2 ） the above significance increases with the increase of the pile inserted depth.