Evaluation of the uplift behavior of plate anchor in structured marine clay
Evaluation of the uplift behavior of plate anchor in structured marine clay
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DOI：
10.1080/1064119x.2016.1240273
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发表时间：
2017-08
影响因子：
2.2
通讯作者：
Ning Zhang;Huai-na Wu;J. Shen;T. Hino;Z. Yin
中科院分区：
文献类型：
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作者：
Ning Zhang;Huai-na Wu;J. Shen;T. Hino;Z. Yin
摘要通过室内试验和有限元分析，研究了结构性粘土（有明软粘土）中板式锚的抗拔性能。通过试验研究了有明粘土的触变性、固结时间和锚的埋深比等因素对锚性能的影响。采用有限单元法分析和预测了锚板井在弹性区的上拔性能和屈服荷载。室内试验和有限元分析结果表明，在有明粘土中，深锚的埋深比接近4。埋深比的进一步增加在较小程度上提高了容量。有限元法高估了有明软粘土中抗拔锚的破坏荷载约20%。这可能归因于有限元分析中的假设，即粘土和锚之间存在连续接触直到失效。验证了Vesic的深锚理论在预测有明粘土中板锚极限抗拔力方面的适用性。本文采用有限元方法对锚周围的塑性流动区进行了讨论，使设计阶段对锚的受力性能有更好的了解。
ABSTRACT The uplift behavior of a plate anchor in a structured clay (soft Ariake clay) is investigated through a series of laboratory tests and method of finite element analysis. The tests are adopted to identify the factors influencing the behavior of the anchor, including the thixotropic nature of Ariake clay, consolidation time, and embedment ratio of the anchor. A finite element method (FEM) is used to analyze and predict the uplift behavior of the anchor plate well in the elastic region and the yield load. The results from both the laboratory tests and the FEM analysis suggest that the embedment ratio for a deep anchor in Ariake clay is close to 4. Further increase in embedment ratio improves the capacity to a lesser extent. FEM overestimates the failure load of the uplift anchor in soft Ariake clay by about 20%. This may be ascribed to the hypothesis in the FEM analysis that there is continuous contact between the clay and the anchor until failure. Vesic’s theory for deep anchors, which may be used to predict the ultimate pullout resistance of the plate anchor in reconstituted Ariake clay, is verified to be applicable. In this paper, the plastic flow zone around the anchor is discussed using FEM which makes the behavior of anchor more understandable during the design stage.