处于海洋环境的桩柱在瑞利波作用下的响应
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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。
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.
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.
引文
[1]冯永正,王立忠,陈云敏.瑞利波作用下双层地基中群桩横向动力响应[J].振动工程学报,2001,14(3):284-291.FENG Yongzheng,WANG Lizhong,CHEN Yunming.Lateral dynamic response of pile group in double-layered soils during the passage of Rayleighwaves[J].Journal of Vibration Engineering,2001 14(3):284-291.(in Chinese)
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[5]何晓宇,李宏男.波浪与地震对小尺度桩柱的共同作用研究[J].地震工程与工程振动,2007,27(5):41-48.HE Xiaoyu,LI Hongnan.Research on piles with small dimension under the combination of seismic and wave action[J].Journal of EarthquakeEngineering and Engineering Vibration,2007,27(5):41-48.(in Chinese)
[6]Novak M,Mitwally H.Random response of offshore towers with pile-soil-pile interaction[J].Journal of Offshore Mechanics and Arctic Engineer-ing February 1990,112:35-41.
[7]Biot M A.Theory of propagation of elastic waves in a fluid-saturated poroussolid[J].Acoust Soc Am,1956,28(2):168-191.
[8]夏唐代,朱少杰,陈龙珠,等.半空间饱和土中瑞利波特性[J].水利学报,1998(2):47-53.XIA Tangdai,ZHU Shaojie,CHEN Longzhu,et al.Characteristics of Ralyeigh waves in a saturated half-space soil[J].Journal of Hydraulic Engi-neering,1998(2):47-53.(in Chinese)
[9]李玉成,滕斌.波浪对海上建筑物的作用[M].北京:海洋出版社,1990:253-256.LI Yucheng,TENG Bin.Wave action on maritime structures[M].Bejing:Ocean Press,1990:253-256.(in Chinese)
[10]George Gazetas,Ricardo Dobry.Horizontal response of piles in layered soils[J].Journal of Geotechnical Engineering,1984,110(1):20-40.
[2]陆建飞,聂卫东.饱和土中单桩在瑞利波作用下的动力响应[J].岩土工程学报,2008,30(2):225-231.LU Jianfei,NIE Weidong.Dynamic response of single pile embedded in half-space saturated soil subjected to Rayleigh waves[J].Chinese Jour-nal of Geotechnical Engineering,2008,30(2):225-231.(in Chinese)
[3]曲乃泗.水中空间结构对随机地震的反应[J].地震工程与工程振动,1986,6(1):61-71.QU Naisi.Response of submerged space structures to stochastic earthquakes[J].Journal of Earthquake Engineering and Engineering Vibration,1986,6(1):61-71.(in Chinese)
[4]张学志,黄维平,李华军.考虑流固耦合时的海洋平台结构非线性动力分析[J].中国海洋大学学报,2005,35(5):823-826.ZHANG Xuezhi,HUANG Weiping,LI Huajun.Nonlinear dynamic analysis of offshore platform considering fluid-structure interaction[J].Peri-odical of Ocean University of China,2005,35(5):823-826.(in Chinese)
[5]何晓宇,李宏男.波浪与地震对小尺度桩柱的共同作用研究[J].地震工程与工程振动,2007,27(5):41-48.HE Xiaoyu,LI Hongnan.Research on piles with small dimension under the combination of seismic and wave action[J].Journal of EarthquakeEngineering and Engineering Vibration,2007,27(5):41-48.(in Chinese)
[6]Novak M,Mitwally H.Random response of offshore towers with pile-soil-pile interaction[J].Journal of Offshore Mechanics and Arctic Engineer-ing February 1990,112:35-41.
[7]Biot M A.Theory of propagation of elastic waves in a fluid-saturated poroussolid[J].Acoust Soc Am,1956,28(2):168-191.
[8]夏唐代,朱少杰,陈龙珠,等.半空间饱和土中瑞利波特性[J].水利学报,1998(2):47-53.XIA Tangdai,ZHU Shaojie,CHEN Longzhu,et al.Characteristics of Ralyeigh waves in a saturated half-space soil[J].Journal of Hydraulic Engi-neering,1998(2):47-53.(in Chinese)
[9]李玉成,滕斌.波浪对海上建筑物的作用[M].北京:海洋出版社,1990:253-256.LI Yucheng,TENG Bin.Wave action on maritime structures[M].Bejing:Ocean Press,1990:253-256.(in Chinese)
[10]George Gazetas,Ricardo Dobry.Horizontal response of piles in layered soils[J].Journal of Geotechnical Engineering,1984,110(1):20-40.
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