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Multi-directional cyclic p-y curves for soft clays

机译：软黏土的多向循环p-y曲线

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摘要

Currently there is a lack of information and experimental data to formulate p-y curves in multidirectional loading conditions for soft clays. Experimental evidence has shown that uni-directional p-y curves are not able to represent correctly the near field soil response to multi-directional earthquake loading. This paper presents the results of an experimental study aimed at characterizing soil-pile interface response for multi-directional pile trajectories in soft clay. Series of multidirectional p-y test were performed including circular, elliptical, parabolic, and figure-8 pile transit paths. These tests provide information regarding the force-displacement relationship dependence on the loading path, the evolution of the soil stiffness during multi-directional cyclic loading, the effect of loading history on the near field soil stiffness, and the variation of the lateral load with pile depth. The tests results showed that the multi-directional movement of the pile produces loading induced anisotropy, which can significantly affect the behavior of the near field soil. From the results gathered it is clear that the soil-pile interaction in soft clay during multi-directional loading, is complex and cannot be modeled with methods based on the traditional concept of p-y curves simply applied in two orthogonal directions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：当前，在软粘土的多向载荷条件下，缺乏制定p-y曲线的信息和实验数据。实验证据表明，单向p-y曲线不能正确表示近地土壤对多向地震荷载的响应。本文介绍了旨在表征软土中多向桩轨迹的土-桩界面响应的实验研究结果。进行了一系列的多方向p-y测试，包括圆形，椭圆形，抛物线形和图8的桩过渡路径。这些测试提供了关于力-位移关系依赖于加载路径，多向循环加载过程中土壤刚度的演变，加载历史对近场土壤刚度的影响以及桩侧向载荷变化的信息。深度。试验结果表明，桩的多向运动会产生荷载引起的各向异性，这会显着影响近场土壤的性状。从收集的结果来看，很明显，在多方向加载过程中，软土中的土-桩相互作用是复杂的，无法使用基于简单地沿两个正交方向使用的传统p-y曲线的方法进行建模。 （C）2016 Elsevier Ltd.保留所有权利。

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