爆炸波土层动力响应对比分析
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摘要
以人工爆炸波为震源,通过现场测试获取基岩及土层的地震动参数,并采用等效线性化分析方法计算相应的地震动参数用于与实测结果进行对比分析。峰值加速度对比结果表明,等效线性化分析方法对于Ⅱ类场地的适应性较好,计算结果与实测结果非常接近,而Ⅲ类场地的计算结果与实测值之间存在较大的误差。加速度反应谱的对比结果表明,无论是计算结果还是实测记录,加速度反应谱的峰值均比基岩输入的要大,且土层反应计算的结果小于实际记录;加速度反应谱的宽度与场地类别关系密切,Ⅲ类场地明显比Ⅱ类场地要大,两类场地的计算结果也均小于实测值。
The ground motion parameters of bedrock and soils were acquired by field experiments, using an artificial blast wave as the seismic source. Field drilling was conducted and the corresponding data was obtained, and then, the seismic response analysis was carried out by equivalent linearization. The rationality of the conclusion is discussed through comparisons between the calculated and measured values. The peak acceleration comparison results show that the equivalent linearization method is better for class II sites, and the calculated values of surface peak acceleration match well with the measured values. For class III sites, there are relatively large discrepancies between the calculated and measured values, which vary with the overburden thickness. According to the comparison results of acceleration response spectrum, both the calculated and measured values of peak ground acceleration response spectrum are larger than those of bedrock input, and the measured values are greater than the calculated values. The width of the acceleration response spectrum is closely related to the site category, and the width of the acceleration response spectrum of class III site is significantly larger than that of class II site; moreover, the measured values of the two types of sites are both larger than the calculated values.
The ground motion parameters of bedrock and soils were acquired by field experiments, using an artificial blast wave as the seismic source. Field drilling was conducted and the corresponding data was obtained, and then, the seismic response analysis was carried out by equivalent linearization. The rationality of the conclusion is discussed through comparisons between the calculated and measured values. The peak acceleration comparison results show that the equivalent linearization method is better for class II sites, and the calculated values of surface peak acceleration match well with the measured values. For class III sites, there are relatively large discrepancies between the calculated and measured values, which vary with the overburden thickness. According to the comparison results of acceleration response spectrum, both the calculated and measured values of peak ground acceleration response spectrum are larger than those of bedrock input, and the measured values are greater than the calculated values. The width of the acceleration response spectrum is closely related to the site category, and the width of the acceleration response spectrum of class III site is significantly larger than that of class II site; moreover, the measured values of the two types of sites are both larger than the calculated values.
引文
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[3] 章文波,谢礼立,郭明珠.利用强震记录分析场地的地震反应[J].地震学报,2001,24(6):604-614.ZHANG Wenbo,XIE Lili,GUO Mingzhu.Estimation on Site-Amplification from Different Methods Using Strongmotion Data Obtained in Tangshan,China[J].Acta Seismologica Sinica,2001,24(6):604-614.
[4] 齐文浩,薄景山,刘德东,等.强震记录对三个土层地震反应分析程序的检验[J].地震工程与工程振动,2005,25(5):30-33.QI Wenhao,BO Jingshan,LIU Dedong,et al.A Test for Three Programs of Soil Layer Seismic Response Analysis by Strong Earthquake Record[J].Earthquake Engineering and Engineering Vibration,2005,25(5):30-33.
[5] 刘峥,徐永林,王绍博,等.用强震记录检验深厚土层小应变下一维等效线性化土层地震反应[J].震灾防御技术,2011,6(4):372-383.LIU Zheng,XU Yonglin,WANG Shaobo,et al.Research on One Dimensional Equivalent Linear Seismic Response of Deep Soil Based on the Strong Motion Record at Small Strain[J].Technology for Earthquake Disaster Prevention,2011,6(4):372-383.
[6] 徐永林,熊里军,章纯,等.用强震仪记录资料研究上海地表土层的地震动放大反应[J].地震学报,2002,24(6):662-666.XU Yonglin,XIONG Lijun,ZHANG Chun,et al.A Study on Amplification Response of Soil Ground Motion in Shanghai Using Strong Motion Records[J].Acta Seismologica Sinica,2002,24(6):662-666.
[7] 周新民,路建波,徐平.弱震区土层对基岩峰值加速度放大效应的试验研究[J].地震工程学报,2015(4):952-955.ZHOU Xinmin,LU Jianbo,XU Ping.Experimental Study on the Amplification Effect of Bedrock Peak Acceleration Caused by the Soil Layer in a Weak Shock Region[J].China Earthquake Engineering Journal,2015(4):952-955.
[8] 齐文浩,薄景山.土层地震反应等效线性化方法综述[J].世界地震工程,2007,23(4):221-226.QI Wenhao,BO Jingshan.Summarization on Equivalent Linear Method of Seismic Responses for Soil Layers[J].World Information on Earthquake Engineering,2007,23(4):221-226.
[9] 沈建文,蔡长青,邱瑛.XQH1.00地震安全性评价工作程序包简介[J].地震学刊,1997(1):46-52.SHEN Jianwen,CAI Changqing,QIU Ying.Software Package of Seismic Microzonation XQH 1.00[J].Journal of Seismology,1997(1):46-52.
[10] 沈建文,刘峥,石树中.用震级和距离参数修正土层反应的等效线性化方法[J].地震学报,2010,32(4):466-475.SHEN Jianwen,LIU Zheng,SHI Shuzhong.Modify Equivalent Linear Method of Finding Soil Seismic Response with Magnitude and Distance Parameters[J].Acta Seismologica Sinica,2010,32(4):466-475.
[11] 廖振鹏.地震小区划:理论与实践[M].北京:地震出版社,1989.LIAO Zhenpeng.Seismic Microzonation:Theory and Practice[M].Beijing:Seismological Press,1989.