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A probabilistic analysis of random wave-induced liquefaction

机译：随机波诱发液化的概率分析

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摘要

Seabed instability caused by soil liquefaction due to build-up of excess pore pressure within the sedimentary seabed represents a serious threat to coastal structures. Models of varying sophistication exist for predicting the liquefaction process but most previous calculations are limited to regular waves while the real waves are random. In this study, a numerical study of liquefaction potential of a sand bed under narrow-band random waves is carried out employing ensemble modelling techniques. The aim of the work is to investigate the effect of random waves on excess pore pressure build-up and liquefaction processes and study the probability distribution of the maximum liquefaction depth. The computational results using a ID liquefaction model indicate that the random wave-induced liquefaction can be much deeper than that of the corresponding regular waves with the largest individual waves in the random wave time series playing a dominant role in determining the maximum liquefaction depth. It is also found that the time for the maximum liquefaction depth to be reached can vary considerably from one random wave series to another, which suggests that in random waves notable densification may occur within the same timeframe as that for liquefaction.
机译：由于沉积液海床内过多孔隙压力的积聚而引起的土壤液化引起的海床不稳定，对沿海结构构成了严重威胁。存在各种复杂度的模型来预测液化过程，但是大多数先前的计算仅限于规则波，而实际波是随机的。在这项研究中，采用集成建模技术对砂岩在窄带随机波作用下的液化潜力进行了数值研究。这项工作的目的是研究随机波对过大孔隙压力积累和液化过程的影响，并研究最大液化深度的概率分布。使用ID液化模型的计算结果表明，随机波引起的液化比对应的规则波要深得多，在随机波时间序列中，最大单个波的相应规则波在确定最大液化深度方面起着主导作用。还发现，达到最大液化深度的时间从一个随机波系列到另一个随机波系列可以有很大的不同，这表明在随机波中，明显的致密化可能在与液化相同的时间范围内发生。

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