Analysis of the cone penetration test in layered clay
Analysis of the cone penetration test in layered clay
复制标题
层状粘土锥入度试验分析
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Hai
中科院分区：
文献类型：
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作者：
James Walker;Hai
本文介绍了一种分析的锥贯入试验在多层粘土使用商业有限元程序Abaqus/显式。采用von Mises屈服准则和相应的流动法则模拟弹塑性不排水粘土的塑性变形。采用任意拉格朗日-欧拉格式和改进的沙漏算法，保证了整个数值模拟过程的网格质量。首先，在只有两层的土壤中检查贯入阻力的行为。底层是两层中较弱的一层，并研究了锥体接近下层时的贯入阻力特性。然后，将调查扩展到研究在多层粘土中通过将较弱的粘土层夹在两个较强的粘土层之间来进行静力触探试验。较弱的粘土层的厚度是不同的，渗透阻力的行为进行了研究与土层的厚度和相对强度。结果进行了讨论，相对于土壤的机制，存在时，锥移动过去的相关层的边界，使这些边界的位置可以更准确地确定。
This paper presents an analysis of the cone penetration test in multi-layered clays using the commercial finite-element code Abaqus/Explicit. The von Mises yield criterion and its associated flow rule are assumed to model the plastic behaviour of elastoplastic undrained clays. An arbitrary Lagrangian–Eulerian scheme and an enhanced hourglass algorithm are adopted to preserve the quality of mesh throughout the numerical simulation. Initially, the behaviour of the penetration resistance is examined in a soil with only two layers. The bottom layer is the weaker of the two and the behaviour of the penetration resistance when the cone approaches the lower layer is studied. The investigation is then extended to study the cone penetration test in a multi-layered clay by sandwiching a weaker clay layer between two stronger clay layers. The thickness of the weaker clay layer is varied and the behaviour of the penetration resistance is studied in relation to the thickness and relative strength of the soil layers. The results are discussed with respect to the soil mechanisms that are present when the cone moves past the relevant layer boundaries so that the position of these boundaries can be determined more accurately.