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Bearing capacity and soil deformation around modified suction caisson in clay under monotonic horizontal loading
Marine Georesources & Geotechnology ( IF 2.2 ) Pub Date : 2022-08-22 , DOI: 10.1080/1064119x.2022.2111673
Yukun Zhang 1, 2 , Yansheng Wang 1 , Dayong Li 1, 3 , Dawei Mao 2
Affiliation  

Abstract

Suction caissons for offshore wind turbine (OWT) are required to withstand larger horizontal load resulting from wind and wave. In order to increase the horizontal bearing capacity, the modified suction caisson (MSC) was proposed. Experimental studies were conducted to investigate the bearing behavior and soil deformation around MSC in clay under horizontal loading. Influence factors such as the undrained shear strength and installation methods were studied. Results show that the horizontal bearing capacity of the MSC increases by 20–40% compared with the regular suction caisson (RSC). The horizontal bearing capacity of the MSC increases with increasing the undrained shear strength. In addition, the horizontal bearing capacity of the MSC installed by jacked force is higher than that installed by applied suction. The rotation center was found to move downwards with the increase of the suction caisson deflection. In the limit state, upward deformation of clay and cracks within the deformed clay were observed in the loading direction. However, a gap between clay and the suction caisson edge opposite the loading direction was found. The deformation range around the MSC is larger than that around the RSC, indicating that the MSC can mobilize more soil to resist the horizontal load.



中文翻译:

单调水平荷载作用下粘土改良吸力沉箱周围土体变形及承载力

摘要

海上风机(OWT)的吸力沉箱需要承受较大的风浪水平载荷。为了提高水平承载力,提出了改进的吸力沉箱(MSC)。进行实验研究以研究水平荷载作用下粘土中 MSC 周围的承载行为和土壤变形。研究了不排水抗剪强度及安装方法等影响因素。结果表明,与常规吸力沉箱(RSC)相比,MSC的水平承载力提高了20%~40%。MSC的水平承载力随着不排水抗剪强度的增加而增加。另外,顶力安装的MSC的水平承载力高于吸力安装的MSC。发现随着吸力沉箱挠度的增大,旋转中心向下移动。在极限状态下,在加载方向上观察到粘土向上变形以及变形粘土内的裂纹。然而,在与加载方向相反的粘土和吸力沉箱边缘之间发现了间隙。MSC周围的变形范围大于RSC周围的变形范围,表明MSC可以动员更多的土体来抵抗水平荷载。

更新日期:2022-08-22
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