Pile and penetrometer end bearing resistance in two-layered soil profiles
Pile and penetrometer end bearing resistance in two-layered soil profiles
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DOI：
10.1680/geot.2008.58.3.187
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发表时间：
2008-04
期刊：
影响因子：
5.8
通讯作者：
X. Xu;B. Lehane
中科院分区：
文献类型：
--
作者：
X. Xu;B. Lehane
本文研究了土壤强度和刚度对两层土壤剖面（即上覆或下覆软土）中的锥体或位移桩所产生的端部阻力的影响。该研究涉及一系列数值分析，假设球腔膨胀类似，将桩/锥体穿透理想化。它显示了贯入计在致密沙子（即坚固的土壤）中调动的端部阻力如何随软弱土壤（这里假设是松散的沙子或软粘土）的贯入计直径（D）的数量而变化，并且取决于强层和弱层的稳态贯入阻力之比。在穿透力大于 2D 时，软弱土壤中的贯入仪阻力不受相邻坚固层的影响。提出了一种基于数值参数研究的设计程序，随后表明该程序与离心机测试数据和先前的数值研究进行了很好的比较。
The paper examines the influence of soil strength and stiffness on the end resistance mobilised by a cone or displacement pile in a two-layered soil profile (i.e. strong soil overlying or underlying weak soil). The investigation involved a series of numerical analyses that idealise pile/cone penetration assuming the spherical cavity expansion analogue. It is shown how the end resistance mobilised by a penetrometer in a dense sand (i.e. strong soil) varies with the number of penetrometer diameters (D) from a weak soil (assumed here to be either a loose sand or soft clay), and depends on the ratio of the steady-state penetration resistances of the strong and weak layers. The penetrometer resistance in the weak soil is not affected by an adjacent strong layer at penetrations greater than 2D. A design procedure based on a numerical parametric study is proposed, and this is subsequently shown to compare well with centrifuge test data and with previous numerical research.