Response of bioinspired scale arrangement in a suction caisson to penetrating into clay reflected by using interface direct shear tests

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN
Dayong Li, Yongan Ma, Jipeng Zhao
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引用次数: 0

Abstract

The suction caisson has been used to support the offshore wind turbine in last decade. Normally, the resistance of the traditional suction caisson (TSC) to penetrating into the seabed is overcome by suction resulting in high soil plug causing early termination in installation. Therefore, this study proposes a novel scaled suction caisson (SSC) that adopts the bionic design concept of little forward resistance and large backward resistance in scaled belly of reptiles like snakes. The bioinspired scale is set on the outer sidewall of the TSC, which is called the SSC. Scale arrangement is the key factor to reduce penetration resistance of the SSC. To simulate the penetration, the interfacial direct shear tests are carried out along the cranial direction (i.e., forward direction of the snake). The interfacial behavior of the scaled steel plate and clay is studied under different consolidation pressures and normal stresses. The results show that normal stress is the key factor compared with the consolidation pressure. There are clay-scale shear zone and clay-clay shear zone during shearing with the increase of the scale height, respectively. In addition, the theoretical formula for calculating critical shear stress is proposed, and the calculated results are in great agreement with the model test. As the scale height increases from 0.5 mm to 1.5 mm, the peak shear stress first increases and then decreases. Meanwhile, it is determined that the design of the scale height in the clay cannot exceed 108 d50. Finally, the optimal geometric characteristics and scale arrangements of the SSC are determined by analyzing the peak shear stress and peak internal friction angle of various scale-clay interfaces. The results can contribute to optimizing the scales arrangement for easy penetration of the SSC in clay.
通过界面直接剪切试验了解吸力沉箱中的生物启发鳞片排列对穿透粘土的反应
近十年来,吸力沉箱已被用于支撑海上风力涡轮机。通常情况下,传统吸力沉箱(TSC)深入海底的阻力会被吸力克服,造成高土塞,导致安装提前终止。因此,本研究提出了一种新型缩放式吸力沉箱(SSC),它采用了蛇等爬行动物缩放腹部的仿生设计理念,即前进阻力小,后退阻力大。生物启发的鳞片设置在 TSC 的外侧壁上,这就是 SSC。鳞片布置是降低 SSC 穿透阻力的关键因素。为模拟穿透,沿头颅方向(即蛇的前进方向)进行了界面直接剪切试验。在不同的固结压力和法向应力下,研究了鳞片钢板和粘土的界面行为。结果表明,与固结压力相比,法向应力是关键因素。随着鳞片高度的增加,剪切过程中分别存在粘土鳞片剪切区和粘土-粘土剪切区。此外,还提出了临界剪应力的理论计算公式,计算结果与模型试验结果非常吻合。随着鳞片高度从 0.5 mm 增加到 1.5 mm,峰值剪应力先增大后减小。同时,确定粘土中的鳞片高度设计不能超过 108 d50。最后,通过分析各种鳞片-粘土界面的峰值剪应力和峰值内摩擦角,确定了 SSC 的最佳几何特征和鳞片排列。这些结果有助于优化鳞片排列,使 SSC 易于穿透粘土。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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