海底软弱场地非线性地震反应及其应用研究
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摘要
海底软弱场地土具有较强的非线性特性,频域等效线性模型及方法将不足以反应海底软土动力响应的真实情况,因此为了更合理地估计海底软弱场地对地震动的影响,运用一种考虑拟合阻尼比、刚度比试验曲线的时域分析方法,对渤海海域内2个实际软弱场地模型进行非线性地震反应分析,通过对比时域非线性与频域等效线性化方法得到的时程、反应谱及傅里叶谱,从而提出更加真实更加可靠的海底泥面的设计地震动参数。研究成果对于今后开展海域软弱场地非线性地震反应分析方法的研究工作有一定的参考价值,对于指导我国海洋工程的抗震设防要求、提高海域设计地震动参数精度有一定的理论意义和现实意义。
Due to the characteristic of high nonlinearity,true response of seabed soft soil cannot be adequately reflected by methods based on equivalent linear model in frequency domain. For estimating the nonlinear seismic response more exactly,it is recommended to a true nonlinear method in time domain fitting G / G0-γ curve and λ-γ curve,and using it to 1D nonlinear seismic response analysis of soil layers on two real bores in Bohai seafloor. After comparing the time history,response spectrum,and fourier spectrum obtained from the two methods,more realistic and more reliable design ground motion parameters were proposed. With some reference value for future research on seabed soft soil nonlinear seismic response analysis,the results also show significance,both theoretically and practically,in guiding our ocean engineering requirements for seismic resistance,as well as improving the accuracy of marine design ground motion parameters.
Due to the characteristic of high nonlinearity,true response of seabed soft soil cannot be adequately reflected by methods based on equivalent linear model in frequency domain. For estimating the nonlinear seismic response more exactly,it is recommended to a true nonlinear method in time domain fitting G / G0-γ curve and λ-γ curve,and using it to 1D nonlinear seismic response analysis of soil layers on two real bores in Bohai seafloor. After comparing the time history,response spectrum,and fourier spectrum obtained from the two methods,more realistic and more reliable design ground motion parameters were proposed. With some reference value for future research on seabed soft soil nonlinear seismic response analysis,the results also show significance,both theoretically and practically,in guiding our ocean engineering requirements for seismic resistance,as well as improving the accuracy of marine design ground motion parameters.
引文
[1]廖振鹏,李小军.地表土层地震反应的等效线性化解法[M]//地震小区划—理论与实践.北京:地震出版社,1989:141-153(Liao Zhenpeng,Li Xiaojun.Linearization method for computing earthquake response of ground layered soil[M]//Seismic Microzonation.Beijing:Seismological Press,1989:141-153(in Chinese))
[2]齐文浩,王振清,薄景山.土层非线性地震反应分析方法及其检验[J].哈尔滨工程大学学报,2010,31(4):444-450(Qi Wenhao,Wang Zhenqing,Bo Jingshan.Development and verification of a method for analyzing the nonlinear seismic response of soil layers[J].Journal of Harbin Engineering University,2010,31(4):444-450(in Chinese))
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[10]黄玉龙,郭讯,袁一凡,等.软泥夹层对香港场地地震反应的影响[J].自然灾害学报,2000,9(1):109-116(Wong Yuklung,Guo Xun,Yuan Yifan,et al.Influence of soft sandwich layer on seismic response in Hong Kong[J].Journal of Natural Disasters,2000,9(1):109-116(in Chinese))
[11]李小军.海域工程场地地震安全性评价的特殊问题[J].震灾防御技术,2006,1(2):97-104(Li Xiaojun.Special problems on evaluation of seismic safety for offshore engineering site[J].Technology for Earthquake Disaster Prevention,2006,1(2):97-104(in Chinese))
[12]廖振鹏.工程波动理论导论[M].第2版.北京:科学出版社,2002:156-162
[13]卢滔,周正华,霍敬妍.土层非线性地震反应一维时域分析[J].岩土力学,2008,29(8):2170-2176(Lu Tao,Zhou Zhenghua,Huo Jingyan.1D nonlinear seismic response analysis of soil layers in time domain[J].Rock and Soil Mechanics,2008,29(8):2170-2176(in Chinese))
[14]李小军.土的动力本构关系的一种简单函数表达式[J].岩土工程学报,1992,14(5):90-94(Li Xiaojun.A simple functional formula of dynamic constitutive models of saturated soils[J].Chinese Journal of Geotechnical Engineering,1992,14(5):90-94(in Chinese))
[15]李小军,廖振鹏,张克绪.考虑阻尼拟合的动态股价曲线函数式[J].地震工程与工程振动,1994,14(1):30-35(Li Xiaojun,Liao Zhenpeng,Zhang Kexu.A functional formula of dynamic skeleton curve taking account of damping effect[J].Earthquake Engineering and Engineering Vibration,1994,14(1):30-35(in Chinese))
[2]齐文浩,王振清,薄景山.土层非线性地震反应分析方法及其检验[J].哈尔滨工程大学学报,2010,31(4):444-450(Qi Wenhao,Wang Zhenqing,Bo Jingshan.Development and verification of a method for analyzing the nonlinear seismic response of soil layers[J].Journal of Harbin Engineering University,2010,31(4):444-450(in Chinese))
[3]李小军.非线性土层地震反应分析的一种方法[J].华南地震,1992,12(4):1-8(Li Xiaojun.A method to analyzing response of nonlinear soil layers[J].South China Journal of Seismology,1992,12(4):1-8(in Chinese))
[4]Joyner W B.Calculation of nonlinear ground response in earthquake[J].Bulletin of the Seismological Society of America,1975,65(5):1315-1321
[5]Robert P,Nonlinear soil models for irregular cyclic loadings[J].Journal of the Geotechnical Engineering Division,1979,105(6):715-726
[6]王志良,韩清宇.粘弹塑性土层地震反应的波动分析法[J].地震工程与工程振动,1981,1(1):117-137(Wang Zhiliang,Han Qingyu.Analysis of wave propagation for the site seismic response,using the visco-elastoplastic model[J].Earthquake Engineering and Engineering Vibration,1981,1(1):117-137(in Chinese))
[7]栾茂田,林皋.场地地震反应一维非线性计算模型[J].工程力学,1992,9(1):94-103(Luan Maotian,Lin Gao.Computational model for nonlinear analysis of soil site seismic response[J].Engineering Mechanics,1992,9(1):94-103(in Chinese))
[8]牛作民.渤海湾海相淤泥土工程物理性质的初步研究[J].海洋地质与第四纪地质,1986,6(3):35-42(Niu Zuomin.Geotechnical characteristics and origin of absorbability of marine puddly soil in Bohai gulf[J].Marine Geology&Quaternary Geology,1986,6(3):35-42(in Chinese))
[9]陈国兴,陈继华.软弱土层的厚度及埋深对深厚软弱场地地震效应的影响[J].世界地震工程,2004,20(3):67-74(Chen Guoxing,Chen Jihua.The effect of depth and thickness of soft soil layer on earthquake response for deep soft sites[J].World Earthquake Engineering,2004,20(3):67-74(in Chinese))
[10]黄玉龙,郭讯,袁一凡,等.软泥夹层对香港场地地震反应的影响[J].自然灾害学报,2000,9(1):109-116(Wong Yuklung,Guo Xun,Yuan Yifan,et al.Influence of soft sandwich layer on seismic response in Hong Kong[J].Journal of Natural Disasters,2000,9(1):109-116(in Chinese))
[11]李小军.海域工程场地地震安全性评价的特殊问题[J].震灾防御技术,2006,1(2):97-104(Li Xiaojun.Special problems on evaluation of seismic safety for offshore engineering site[J].Technology for Earthquake Disaster Prevention,2006,1(2):97-104(in Chinese))
[12]廖振鹏.工程波动理论导论[M].第2版.北京:科学出版社,2002:156-162
[13]卢滔,周正华,霍敬妍.土层非线性地震反应一维时域分析[J].岩土力学,2008,29(8):2170-2176(Lu Tao,Zhou Zhenghua,Huo Jingyan.1D nonlinear seismic response analysis of soil layers in time domain[J].Rock and Soil Mechanics,2008,29(8):2170-2176(in Chinese))
[14]李小军.土的动力本构关系的一种简单函数表达式[J].岩土工程学报,1992,14(5):90-94(Li Xiaojun.A simple functional formula of dynamic constitutive models of saturated soils[J].Chinese Journal of Geotechnical Engineering,1992,14(5):90-94(in Chinese))
[15]李小军,廖振鹏,张克绪.考虑阻尼拟合的动态股价曲线函数式[J].地震工程与工程振动,1994,14(1):30-35(Li Xiaojun,Liao Zhenpeng,Zhang Kexu.A functional formula of dynamic skeleton curve taking account of damping effect[J].Earthquake Engineering and Engineering Vibration,1994,14(1):30-35(in Chinese))
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