含软夹层的层状沉积河谷场地的地震动力响应分析
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摘要
把层状沉积河谷场地中的软夹层模拟为流体饱和多孔介质,结合已有的对单相弹性固体介质、流体饱和多孔介质进行动力反应分析的显式有限元方法,建立了既能描述沉积河谷谷底的软土场地(用流体饱和多孔介质描述),又能描述河谷周边山体(用单相弹性介质描述)的计算模型,并利用该方法分析了研究在P波入射下软夹层厚度以及软夹层的刚度等因素对层状沉积谷场地地震动力响应的影响。
An explicit finite element method to analyze the surface motion of layered alluvial valleys with soft interlayer is developed based on the numerical simulation of the continuous conditions on the boundaries between fluid saturated porous medium and elastic single-phase medium. The soft interlayer of layered alluvial valleys is modeled as saturated porous medium. Numerical results are provided to illustrate the effect of the thickness and stiffness of the soft interlayer on seismic dynamic response of layered alluvial valleys with soft interlayer.
An explicit finite element method to analyze the surface motion of layered alluvial valleys with soft interlayer is developed based on the numerical simulation of the continuous conditions on the boundaries between fluid saturated porous medium and elastic single-phase medium. The soft interlayer of layered alluvial valleys is modeled as saturated porous medium. Numerical results are provided to illustrate the effect of the thickness and stiffness of the soft interlayer on seismic dynamic response of layered alluvial valleys with soft interlayer.
引文
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[11]廖振鹏.工程波动理论导引[M].北京:北京科学出版,1996.
[12]赵成刚,王进廷,史培新,等.流体饱和二相多孔介质动力反应分析的显式有限元法[J].岩土工程学报,2001,23(2):178-182.ZHAO Cheng-gang,WANG Jin-ting,SHI Pei-xin,et al.Dynamic analysis of fluid-saturated porous media by using explicit finite element method[J].Chinese Journal of Geotechnical Engineering,2001,23(2):178-182.
[13]李小军.非线性场地地震反应分析方法的研究[D].哈尔滨:国家地震局工程力学研究所,1993.
[2]KURIBAYASHI E,NIIRRO T,NISHIOKA S,et al.Site effect of earthquake ground motion[C]//Proceedings of10th World Conference on Earthquake Engineering.[S.l.]:[s.n.],1992:947-951.
[3]DRAVINSKI M,MOSSESSIAN T K.Scattering of plane harmonic P,SV waves and Rayleigh waves by dipping layers of arbitrary shape[J].Bulletin of Seismological Society of America,1987,77:212-235.
[4]TRIFUNAC M V.Scattering and diffraction of plane P and SV waves by two-dimensional inhomogeneities[J].Soil Dynamics and Earthquake Engineering,1988,7:189-200.
[5]SINGH S K,MENA E,CASTRO R.Some aspects of source characteristics of the19september1985Michoacan earthquake and ground motion amplification in and near Mexico City from strong motion data[J].Bulletin of Seismological Society of America,1988,78(2):451-451.
[6]周锡元,王广军,苏经宇.场地、地基、设计地震[M].北京:地震出版社,1990.
[7]周根寿,王志良,韩清宇.地基与工业建筑抗震[M].北京:地震出版社,1984.
[8]陈鎔,陈竹昌,薛松涛,等.夹有软弱土层的层状场地对入射SH波的响应分析[J].岩石力学与工程学报,1999,18(2):161-165.CHEN Rong,CHEN Zhu-chang,XUE Song-tao,et al.The response analysis of strata with extremely soft soil layer to incident SH waves[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(2):161-165.
[9]梁建文,张郁山,顾晓鲁,等.圆弧形层状沉积河谷场地在平面SH波入射下动力响应分析[J].岩土工程学报,2000,22(4):396-401.LIANG Jian-wen,ZHANG Yu-shan,GU Xiao-lu,et al.Surface motion of circular-arc layered alluvial valleys for incident plane SH waves[J].Chinese Journal of Geotechnical Engineering,2000,22(4):396-401.
[10]梁建文,严林隽,WINCENT W L.圆弧形层状沉积河谷场地对入射平面P波的散射解析解[J].地震学报,2001,23(2):167-184.LIANG Jian-wen,YAN Lin-jun,WINCENT W L.Scattering of plane P waves by circular-arc layered alluvial valleys:an analytical solution[J].Acta Seismologica Sinica,2001,23(2):167-184.
[11]廖振鹏.工程波动理论导引[M].北京:北京科学出版,1996.
[12]赵成刚,王进廷,史培新,等.流体饱和二相多孔介质动力反应分析的显式有限元法[J].岩土工程学报,2001,23(2):178-182.ZHAO Cheng-gang,WANG Jin-ting,SHI Pei-xin,et al.Dynamic analysis of fluid-saturated porous media by using explicit finite element method[J].Chinese Journal of Geotechnical Engineering,2001,23(2):178-182.
[13]李小军.非线性场地地震反应分析方法的研究[D].哈尔滨:国家地震局工程力学研究所,1993.
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