液化侧扩流场地桥梁桩基抗震研究进展
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摘要
震害调查表明,强震下液化侧扩流场地桥梁桩基破坏严重。为此,国内外学者针对液化侧扩流场地桥梁桩基抗震问题开展了大量卓有成效的研究尝试。本文系统总结并评述了液化侧扩流场地桩-土-桥梁结构地震相互作用的基本规律、力学机理、荷载特征与失效机制及其影响因素等的研究成果,全面阐述了液化侧扩流场地桥梁桩基抗震方面的试验、分析方法与数值模拟技术的最新进展,并指出这类场地桩基抗震研究尚存在的主要问题与亟待解决的难题。这项工作对我国桥梁工程的抗震安全性具有重要意义,可供我国研究人员与工程师参考借鉴。
Detailed investigations reveal that liquefaction-induced lateral spreading is a major cause of bridge pile foundations damaged in past earthquakes. In view of this point,many effective research attempts at home and abroad have been performed to extensively study pile behavior and the mechanisms involved under lateral spreading. The paper systematically summaries and comments these investigations on basic characteristics,mechanical mechanism,transfer load law,failure modes and their important influence factors between soil and pile in lateral spreading soils. Meanwhile,recent advance in the experimental investigations,analysis method and numerical simulations will be introduced. Finally,some difficult questions and more future work on seismic design for bridge pile foundation will be proposed for the effect due to lateral spreading. The promotion of this study has some theoretic and practical significance for developing seismic design of pile-supported bridge and provides some valuable references for engineers and researcher in China.
引文
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