深覆盖土层地震反应分析中的若干问题
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摘要
以上海地区土层地震反应分析为例,讨论了深覆盖土层地震反应分析中的几个典型问题.如土层下卧缓倾角基岩面的影响,土层中假想基岩面的合理性问题,基岩波速对土层地震反应的影响,以及土介质动力特性的影响等.通过数值计算,得出了以下主要结论:下卧基岩面不大于2°的缓倾角影响可以忽略不计,假想基岩面会带来很大的计算误差,坚硬基岩的弹性对土层地震反应的影响很有限,应重视工程场地土介质动力特性参数的现场勘测.
Several typical problems in the seismic response analysis of soil layer with deep deposit have been discussed according to the seismic response analysis of the soil layer in Shanghai region.These problems include the effect of the inclination of the bedrock under the soil layer on the seismic responses of soil layer,the rationality of the artificial bedrock boundary in the soil layer,the effect of the wave velocity of the bedrock and dynamic characteristics of the soil media on the seismic responses of soil layer.Significant conclusions are reached through numerical analysis.In the seismic response analysis,the effect of angle of inclination of the rock surface under the soil layer can be neglected if the angle is not more than two degrees.The significant error will be introduced in the calculation when the rock surface is assumed in the soil layer.The elastics of the solid rock has little influence on the seismic response of the deep soil layer.The field investigation for the soil dynamic property should be devoted much attention to.
Several typical problems in the seismic response analysis of soil layer with deep deposit have been discussed according to the seismic response analysis of the soil layer in Shanghai region.These problems include the effect of the inclination of the bedrock under the soil layer on the seismic responses of soil layer,the rationality of the artificial bedrock boundary in the soil layer,the effect of the wave velocity of the bedrock and dynamic characteristics of the soil media on the seismic responses of soil layer.Significant conclusions are reached through numerical analysis.In the seismic response analysis,the effect of angle of inclination of the rock surface under the soil layer can be neglected if the angle is not more than two degrees.The significant error will be introduced in the calculation when the rock surface is assumed in the soil layer.The elastics of the solid rock has little influence on the seismic response of the deep soil layer.The field investigation for the soil dynamic property should be devoted much attention to.
引文
[1]楼梦麟,潘旦光,范立础.土层地震反应中侧向人工边界影响的数值研究[J].同济大学学报:自然科学版,2003,31(7):757.LOU M englin,PAN Danguang,FAN L ichu.E ffect of vertical arti-ficial boundary on seism ic response of soil layer[J].Journal ofTongji Un iversity:Natural Science,2003,31(7):757.
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[6]楼梦麟,严国香,沈建文,等.上海软土动力参数变异性对土层地震反应的影响[J].岩土力学,2004,25(9):1368.LOUM englin,YAN Guoxiang,SHEN Jianwen,et al.E ffect of varia-b ility of dynam ic param eters of soft soil in Shanghai region on seis-m ic response of layered soil[J].Rock and SoilM echan ics,2004,25(9):1368.
[2]楼梦麟.变参数土层的动力特性和地震反应分析[J].同济大学学报:自然科学版,1997,25(2):155.LOU M englin.Dynam ic analysis for model characteristics and seis-m ic responses of soil layer w ith variab le properties[J].Journal ofTongji Un iversity:Natural Science,1997,25(2):155.
[3]楼梦麟,文峰.横观各向同性土层自振周期的计算方法[M]∥段尔焕.建筑结构技术新进展.西安:陕西人民教育出版社,2002:158.LOU M englin,WEN Feng.Approach for vibration periods of soillayerw ith lateral-isotropy[M]∥DUAN Erhuan.New developm entsin structural techn ique.X i'an:Shanxi People Education Press,2002:158-161.
[4]潘旦光,楼梦麟.基岩弹性刚度对土层地震反应的影响[J].地震工程与工程振动,2004,24(4):158-161.PAN Danguang,LOU M englin.Influence of rock stiffness on seis-m ic response of layered soil[J].Earthquake Engineering and En-gineering V ibration,2004,24(4):158.
[5]黄雨,陈竹昌,周红波.上海软土的动力计算模型[J].同济大学学报:自然科学版,2000,28(3):359.HUANG Yu,CHEN Zhuchang,ZHOU Hongbo.Dynam ic calcu la-tion model of Shanghai soft soil[J].Journal of Tongji Un iversity:Natural Science,2000,28(3):359.
[6]楼梦麟,严国香,沈建文,等.上海软土动力参数变异性对土层地震反应的影响[J].岩土力学,2004,25(9):1368.LOUM englin,YAN Guoxiang,SHEN Jianwen,et al.E ffect of varia-b ility of dynam ic param eters of soft soil in Shanghai region on seis-m ic response of layered soil[J].Rock and SoilM echan ics,2004,25(9):1368.
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