...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geotechnical and geoenvironmental engineering >New Mechanism-Based Design Approach for Spudcan Foundations on Single Layer Clay
【24h】

New Mechanism-Based Design Approach for Spudcan Foundations on Single Layer Clay

机译：单层粘土上Spudcan基础基于机理的新设计方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Spudcan foundations for offshore mobile drilling rigs are large saucer-shaped foundations that can penetrate several tens of meters into soft sediments. The penetration depth is typically predicted by considering a wished-in-place foundation at different depths and following traditional bearing capacity approaches to assess the depth at which the estimated capacity matches the applied loading. However, the geometry of the spudcan and its progressive mode of penetration lead to soil failure mechanisms that differ markedly from those relevant to onshore practice. This paper presents a new rational design approach for assessing spudcan penetration in single layer clays based on a study combining centrifuge model testing and large deformation finite-element (FE) analysis. The design approach takes account of the evolving failure mechanisms in the soil, which start with cavity formation and surface heave at shallow penetration, gradually transforming to backflow of soil over the spudcan. A detailed FE parametric study has explored the relevant range of normalized strength, strength nonhomogeletty, and spudcan base roughness, with results validated against centrifuge model test data. The penetration response curves are presents d in terms of profiles of bearing capacity factors, forming nondimensional design charts along with simplified expressions for convenient use in practice. Comparisons with approaches suggested in the SNAME design code suggest an urgent need to update current practice.
机译：海上移动式钻机的Spudcan基础是大型的碟形基础，可以穿透数十米，进入柔软的沉积物中。通常通过考虑不同深度处的地基基础并遵循传统的承载能力方法来评估所估算的能力与所施加的载荷相匹配的深度来预测穿透深度。但是，桩靴的几何形状及其渐进的渗透方式导致土壤破坏机理与陆上实践相关。本文基于离心模型测试和大变形有限元（FE）分析的研究，提出了一种评估单层黏土中钉桩渗透性的新的合理设计方法。设计方法考虑了土壤中不断演变的破坏机制，该机制始于在浅层穿透时的空洞形成和表面隆起，然后逐渐转变为桩靴上方的土壤回流。详尽的有限元参数研究已经探索了归一化强度，强度非同质性和Spudcan基础粗糙度的相关范围，并针对离心模型测试数据验证了结果。渗透响应曲线以承载力因子的分布图形式呈现，形成无量纲设计图以及简化的表达式，以方便实际使用。与SNAME设计代码中建议的方法进行比较表明，迫切需要更新当前的实践。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号