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首页> 外文期刊>Journal of geotechnical and geoenvironmental engineering >Penetration Resistance of Offshore Skirted Foundations and Anchors in Dense Sand
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Penetration Resistance of Offshore Skirted Foundations and Anchors in Dense Sand

机译：稠密沙子中近海裙式基础和锚的抗穿透性

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Penetration of skirts is an essential design issue for offshore skirted foundations and anchors in sand. Skirts may not penetrate far enough into dense sand by the available submerged weight alone. It may therefore be necessary to apply underpressure inside the skirt compartment to produce an increased driving force and to reduce the penetration resistance. This paper recommends procedures to calculate penetration resistance and required underpressure for skirts penetrated in dense sand with and without interbedded clay layers. The recommendations are based on interpretation of skirt penetration data from prototypes, field model tests, and laboratory model tests in dense sand. The paper first presents a model to calculate the penetration resistance of skirts penetrated by weight, or other external vertical load that does not cause flow of water in the sand. Two models are considered; one based on bearing capacity equations with friction angles from laboratory tests, and the other one based on empirical correlations with CPT tip resistance. The bearing capacity model gives more consistent correlations with the empirical data than the CPT model. Thereafter, a model to account for the effect of underpressure applied inside the skirt compartment is proposed. This model is developed based on interpretation of available prototype and model test data from skirts penetrated by underpressure. The results show that underpressure facilitates skirt penetration in sand considerably by providing both an additional penetration force and a reduced penetration resistance. It is also shown that interbedded clay layers can prevent flow of water through the sand and eliminate the beneficial reduction in penetration resistance.
机译：对于海上裙状基础和沙子中的锚，裙部的渗透是必不可少的设计问题。仅靠可用的水下重量，裙子可能无法充分渗透到稠密的沙子中。因此，可能有必要在裙边隔室内施加负压以产生增加的驱动力并降低穿透阻力。本文推荐了一些程序来计算在有或没有夹层粘土层的情况下渗透到稠密沙子中的裙板的抗穿透性和所需的负压。这些建议基于对原型，现场模型测试以及在稠密沙子中的实验室模型测试的裙边穿透数据的解释。本文首先提出了一个模型，用于计算因重量或其他不会导致水在沙子中流动的外部垂直载荷而穿透的裙板的穿透阻力。考虑了两种模型；一种基于实验室测试中带有摩擦角的承载力方程，另一种基于与CPT尖端阻力的经验相关性。承载能力模型与经验数据相比，与CPT模型具有更一致的相关性。此后，提出了一个模型来考虑裙边隔室内施加的负压的影响。该模型是基于对可用原型的解释以及来自受压穿透的裙板的模型测试数据而开发的。结果表明，负压通过提供额外的穿透力和降低的穿透阻力，大大促进了裙缘在沙子中的穿透。还显示出夹层的粘土层可以防止水流过沙子并消除抗渗透性的有益降低。

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