Abstract

Suction caisson is one of the important forms of marine foundation. It is worthwhile to study scour effects on the vertical bearing capacity of suction caissons, which can provide a reference for the design of multi-caisson foundations. This paper investigated the influence of scour depth, stress history, and aspect ratio on the vertical bearing capacity of suction caissons. The capacity decreases with increasing scour depth, and its scour sensitivity is lower compared with the pull-out response. The capacity after scour is larger when the stress history is considered, so ignoring the stress history leads to a conservative design. The greater the aspect ratio, the greater the scour effect on the capacity. Based on these, an empirical formula for evaluating the vertical bearing capacity of suction caissons after scour is established, which reveals the relationship between the capacity and the scour depth and aspect ratio.

摘要

吸力沉箱是海洋基础的重要形式之一。研究冲刷对沉箱竖向承载力的影响是值得的，这可以为多沉箱基础的设计提供参考。本文研究了冲刷深度，应力历程和长宽比对吸水沉箱的竖向承载力的影响。容量随冲刷深度的增加而减小，并且与拉出响应相比，其冲刷敏感性较低。当考虑应力历史时，冲刷后的能力会更大，因此忽略应力历史会导致设计趋于保守。长宽比越大，冲刷对容量的影响越大。在此基础上，建立了评估冲刷后沉箱竖向承载力的经验公式，