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首页> 外文会议>International offshore and polar engineering conference;ISOPE-2010 Beijing >FE Modelling of Spudcan Deep Penetration in Thin Crust Over Soft Clay Incorporating Strain Rate and Strain Softening Effect
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FE Modelling of Spudcan Deep Penetration in Thin Crust Over Soft Clay Incorporating Strain Rate and Strain Softening Effect

机译：结合应变速率和应变软化效应的软黏土上薄壳深厚渗透性的有限元建模

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The paper reports results of finite element analyses undertaken toprovide insight into spudcan foundation behaviour during undrainedvertical penetration through a thin stronger clay layer into weakermaterial, varying the thickness of the upper crust layer relative to thespudcan diameter between 0.17 and 0.5, the strength ratio between 0.2and 0.6 and the normalised strength gradient of the lower layer between0 and 1. The analysis was carried out using a large deformation finiteelement (LDFE) approach, modifying the simple elastic-perfectlyplastic Tresca soil model to allow strain softening, and incorporatestrain rate dependency of the shear strength. Attention was focused onrelatively thin layers, extending previous work that has looked atthicker layers. Discussion focuses chiefly on the effect of (thin) crustthickness ratio, strength ratio and strength non-homogeneity on the soildeformation mechanisms and the form of the penetration resistanceprofile, with emphasis on the likelihood and severity of punch-throughfailure. The potential for punch-through was demonstrated by a localmaximum in penetration resistance followed by some reduction. Thedegree of bearing capacity reduction with penetration, that is theseverity of punch-through, increased with increasing crust layerthickness and decreasing strength ratio between lower and upper soillayer, but decreased with increasing strength gradient of the lowerlayer. The LDFE results were shown to be consistent with results fromcentrifuge tests. While the recently developed mechanism based designapproaches provided excellent prediction, the approaches suggested inoffshore design guidelines was shown to underestimate the penetrationresistance significantly and give poor estimate of the likelihood andseverity of spudcan punch-through.
机译：本文报告了有限元分析的结果，以提供有关不排水垂直穿透薄的坚固粘土层到较弱材料中的桩脚基础行为的信息，相对于桩脚直径，上地壳层的厚度在0.17到0.5之间变化，强度比在0.2到0.5之间。 0.6，下层的归一化强度梯度在0和1之间。使用大变形有限元（LDFE）方法进行了分析，修改了简单的弹塑性塑性Tresca土模型以允许应变软化，并结合了剪切应变率的依赖性强度。人们将注意力集中在相对较薄的层上，从而扩展了以前研究较厚层的工作。讨论主要集中在（薄）壳厚比，强度比和强度非均质性对土壤变形机制和抗穿透性剖面形式的影响上，重点是穿孔失败的可能性和严重性。穿透阻力的局部最大值显示了击穿的潜力，随后有所降低。穿透力的承受能力降低的程度，即穿通性，随着地壳层厚度的增加和上下土层之间强度比的降低而增加，但随下层土层强度梯度的增加而降低。 LDFE结果显示与离心测试结果一致。虽然最近开发的基于机制的设计方法提供了很好的预测，但建议的方法表明，离岸设计指南显着低估了穿透阻力，而对spudcan穿透的可能性和严重性却给出了较差的估计。

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