Numerical investigation of spudcan penetration in multi-layer deposits with an interbedded sand layer
Numerical investigation of spudcan penetration in multi-layer deposits with an interbedded sand layer
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DOI：
10.1680/jgeot.16.p.110
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发表时间：
2017-11
期刊：
影响因子：
5.8
通讯作者：
Jingbin Zheng;M. Hossain;Dong Wang
中科院分区：
文献类型：
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作者：
Jingbin Zheng;M. Hossain;Dong Wang
为了计算两个粘土层之间的互层砂层的桩钉贯入阻力，最近开发的基于机制的表面砂覆盖粘土沉积物的设计方法被扩展以考虑上覆粘土层的影响。进行了一系列大变形有限元 (LDFE) 分析，改变了层的几何形状和强度参数。数值结果和现有的离心机测试数据用于校准扩展的设计方法。将修改后的设计方法与 ISO 标准 19905-1 中建议的方法的性能进行了比较，证实了以前的方法在估计砂层中峰值渗透阻力方面的准确性。还进行了 LDFE 分析，添加了坚固的第四层，讨论了对第二（砂）层中峰值阻力增加和第三（软粘土）层中挤压行为（或限制挤压深度）的相应影响。还开发了设计公式来估计...
For calculating spudcan penetration resistance in an interbedded sand layer between two clay layers, the recently developed mechanism-based design methods for surface sand-over-clay deposits are extended to account for the influence of the overlying clay layer. A series of large-deformation finite-element (LDFE) analyses were carried out, varying layer geometries and strength parameters. The numerical results and existing centrifuge test data are used to calibrate the extended design methods. The performance of the modified design methods and those suggested in the ISO standard 19905-1 is compared, confirming the accuracy of the former methods in estimating the peak penetration resistance in the sand layer. LDFE analyses were also carried out adding a strong fourth layer, with the corresponding effects on the increasing peak resistance in the second (sand) layer and squeezing behaviour (or limiting squeezing depth) in the third (soft clay) layer discussed. Design formulas are also developed to estimate th...