Evaluation, sampling and testing methods for offshore disturbed sands with plastic fines: A case study

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN
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Abstract

Sandy seabed, prevalent near continental shelves, often contains fines that obviously affect their apparent behaviour. The variation in the physical properties of sands and fines, the difference between seismic and marine wave loads, and the challenges in obtaining accurate geotechnical parameters and undisturbed samples for analysis make it difficult to effectively evaluate the properties of sands with plastic fines in offshore engineering. To address this issue, a method for discriminating and re-sampling sands with plastic fines is suggested, along with a case study to assess the static and dynamic behaviours of such sands from an offshore site in the South China Sea. In this study, evaluation processes for detecting the presence of fines in sands and classifying them as plastic or non-plastic are first recommended to gain a better understanding of such sands. Then, a reconstitution approach of re-sampling for disturbed sand samples from site and compactness assessment guided by the optimum moisture content, is suggested to restore their in-situ characteristics, addressing the difficulty in obtaining undisturbed sand samples. Subsequently, the failure behavior and shear strain development under cyclic loading are analyzed via a cyclic contour diagram to evaluate their mechanical properties under marine environmental loads. The obtained contour diagrams can be further integrated into the constitutive model in subsequent research and used in finite element analysis to simplify the computation for marine foundation design. These results can provide valuable insights for improving understandings and engineering practices related to sandy seabed with plastic fines in offshore environments.
含塑性细砂的近海扰动砂的评估、取样和测试方法:案例研究
大陆架附近的沙质海床通常含有细粒,这显然会影响其表观行为。由于砂和细粒物理性质的差异、地震荷载和海浪荷载的不同,以及在获取准确的岩土参数和未扰动样本进行分析方面所面临的挑战,使得在近海工程中难以有效评估含有塑性细粒的砂的特性。为解决这一问题,我们提出了一种对含有塑性细砂的砂进行鉴别和重新取样的方法,并通过一项案例研究来评估此类砂在中国南海近海场地的静态和动态行为。在这项研究中,首先推荐了检测砂中细粒含量并将其分为塑性或非塑性的评估流程,以便更好地了解此类砂。然后,针对难以获得未扰动砂样本的问题,提出了一种重新取样的方法,即从现场重新取样扰动砂样本,并以最佳含水量为指导进行密实度评估,以恢复其原位特征。随后,通过循环等值线图分析了循环荷载下的破坏行为和剪切应变发展,以评估其在海洋环境荷载下的机械性能。获得的等值线图可在后续研究中进一步集成到构成模型中,并用于有限元分析,以简化海洋地基设计的计算。这些结果可为提高对近海环境中含塑料粉尘的砂质海床的理解和工程实践提供宝贵的见解。
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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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