| 处于海洋环境的桩柱在瑞利波作用下的响应 |
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| 引用本文： | 张卫平,孙昭晨.处于海洋环境的桩柱在瑞利波作用下的响应[J].地震工程与工程振动,2012,32(3):124-129. |
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| 作者姓名： | 张卫平 孙昭晨 |
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| 作者单位： | 大连理工大学港口海岸与近海工程国家重点实验室,辽宁大连,116024 |
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| 基金项目： | 国家863项目，国家创新研究群体科学基金 |
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| 摘 要： | 本文以一海洋深水环境桩柱为例,考虑到海洋地基为两相饱和土介质,基于Biot两相饱和多孔介质理论,通过数值算例分析了饱和介质中瑞利波加速度、位移分布规律并与单相弹性介质地基条件下进行了对比,结果表明,瑞利波主要作用于地表附近且振动幅度随深度衰减很快,饱和地基下的瑞利波影响深度要大于单相弹性地基,在瑞利波地震作用下,考虑两相饱和介质下的桩柱位移响应大于单相弹性介质地基。并且由于桩柱处海洋深水环境,本文对环境水体对桩柱振动响应的影响进行了研究,结果表明,流固耦合效应可明显降低桩柱运动响应,在海洋深水环境地震响应分析时,有必要考虑饱和地基以及流固耦合效应对桩柱运动响应的影响。
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| 关 键 词： | 饱和土 瑞利波 弥散方程 传播特性 流固耦合 |
Research on responses of piles in sea environment subjected to Rayleigh waves |
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| ZHANG Weiping
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SUN Zhaochen.Research on responses of piles in sea environment subjected to Rayleigh waves[J].Earthquake Engineering and Engineering Vibration,2012,32(3):124-129. |
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| Authors: | ZHANG Weiping SUN Zhaochen |
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| Institution: | (State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China) |
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| Abstract: | In this article,the dynamic responses of piles under Rayleigh wave action are investigated.Consider that the offshore foundation is two-phase saturated soil medium,based on Biot’s theory,the effects of the saturation on velocity and displacement of Rayleigh wave are analyzed by numerical methods and compared with that for half-space base.It is shown that the major influence is near the surface and decays rapidly with depth,especialy in elastic half-space.Under the action of Rayleigh wave,the response of pile is bigger in saturated soil medium.Because the pile is in the deep sea invironment,the influence of fluid-structure coupling effects is investigated.The results show that the effects have great impact on the response of pile in the open sea environment.It is necessary to take two-phase saturated base and fluid-structure coupling effects into the calculation of pile responses to the Rayleigh wave action. |
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| Keywords: | saturated soil Rayleigh wave dispersion equation propagation characteristic fluid-structure coupling |
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