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Failure mechanism and lateral bearing capacity of monopile-friction wheel hybrid foundations in soft-over-stiff soil deposit
Marine Georesources & Geotechnology ( IF 2.2 ) Pub Date : 2021-06-30 , DOI: 10.1080/1064119x.2021.1934615
Yikang Wang 1 , Xinjun Zou 1 , Mi Zhou 2 , Xihong Zhang 3
Affiliation  

Abstract

Experimental and numerical studies are carried out to explore the lateral load and moment resistance capacities of the monopile-friction wheel hybrid foundation in soft-over-stiff soil deposit. Model tests are firstly conducted to preliminarily investigate the soil failure mechanism of hybrid foundation under lateral eccentric load (lateral loading at a certain height above the seabed), which is followed by full model tests conducted to investigate the lateral load and moment resistance behaviors of the monopile-friction wheel hybrid foundation under static horizontal loading in soft-over-stiff soil deposit. A numerical model is then generated and validated with the laboratory testing results. Parametric study is performed to quantify the lateral bearing capacity of hybrid foundation in clay-over-sand soil deposits. Both the experimental tests and numerical simulations show that compared to conventional monopiles the hybrid system can provide a higher lateral bearing capacity and a larger lateral stiffness. The bearing capacity is found to be mainly influenced by the diameter of wheel Dw, undrained shear strength of clay su, loading eccentricity e and clay layer thickness Tc. Finally, empirical design formulae are proposed to estimate the lateral bearing capacity of the monopile-friction wheel hybrid foundation system under static horizontal loading in soft-over-stiff soil deposit.



中文翻译:

单桩-摩擦轮混合地基在软超硬土层中的破坏机理及横向承载力

摘要

通过试验和数值研究,探讨了单桩-摩擦轮混合地基在软超硬土层中的侧向荷载和抗弯矩能力。首先进行模型试验,初步研究横向偏心荷载(海床以上一定高度的横向荷载)下混合地基的土体破坏机理,然后进行全模型试验,研究地基的横向荷载和抗弯性能。软超硬土中静态水平荷载作用下的单桩-摩擦轮混合地基[J]. 然后使用实验室测试结果生成并验证数值模型。进行参数研究以量化粘土-沙土沉积物中混合地基的横向承载力。实验测试和数值模拟都表明,与传统的单桩相比,混合系统可以提供更高的横向承载能力和更大的横向刚度。发现承载能力主要受车轮直径的影响D w , 粘土不排水抗剪强度s u , 加载偏心率e和粘土层厚度T c。最后,提出了单桩-摩擦轮混合地基系统在软超硬土层中静水平荷载作用下的横向承载力估算的经验设计公式。

更新日期:2021-06-30
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