复杂地形条件对强地震动特征的影响
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摘要
基于甘肃文县获得的汶川地震强余震记录分析和FLAC3D软件模拟场地地震反应的方法研究了地形条件对地震动的影响。首先结合文县流动地震台强余震记录,分析了文县山包场地的地震动分布特征;其次对该山包进行了地形测量、地震勘探和土样采取,根据实测资料建立了FLAC3D三维场地数值模型,采用实际基岩记录输入,研究了山包不同部位地震动的分布特征。研究表明:数值计算与观测的结果在一定频段范围内有较好一致性;其时域峰值加速度放大比接近,反应谱谱比结果放大趋势一致,1～10Hz的地震动放大最明显;FLAC3D软件能够有效地模拟三维场地的地震反应。
Combining the measured time history records of Wenchuan earthquake aftershocks in Wenxian County,Gansu Province and site earthquake response calculated by use of the software FLAC3D,influence of topographic conditions on ground motion was studied in this paper.Firstly,based on strong aftershocks' records of Wenchuan earthquake,elementary characteristics of ground motion at hill sites near Wenxian County town were analyzed.Moreover,combining topographic survey,seismic prospecting and collection of soil samples,this paper establishes a three dimensional site model by FLAC3D,and researches distribution characteristics of ground motion in the hills.Finally,the following conclusions can be drawn:the result of the calculations is close to the observations within a certain freguency band,especially for the amplification ratio of the peak ground acceleration and the spectral ratio of the response spectrum,the frequency range with most obvious amplification is 1-10 Hz;Three-dimensional seismic response can be simulated effectively by software FLAC3D.
Combining the measured time history records of Wenchuan earthquake aftershocks in Wenxian County,Gansu Province and site earthquake response calculated by use of the software FLAC3D,influence of topographic conditions on ground motion was studied in this paper.Firstly,based on strong aftershocks' records of Wenchuan earthquake,elementary characteristics of ground motion at hill sites near Wenxian County town were analyzed.Moreover,combining topographic survey,seismic prospecting and collection of soil samples,this paper establishes a three dimensional site model by FLAC3D,and researches distribution characteristics of ground motion in the hills.Finally,the following conclusions can be drawn:the result of the calculations is close to the observations within a certain freguency band,especially for the amplification ratio of the peak ground acceleration and the spectral ratio of the response spectrum,the frequency range with most obvious amplification is 1-10 Hz;Three-dimensional seismic response can be simulated effectively by software FLAC3D.
引文
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[8]马占虎,周志宇,高晓明等.2006年甘肃文县5.0级地震灾害损失评估[J].西北地震学报.2007,29(3):256-263.MA Zhanhu,ZHOU Zhiyu,GAO Xiaoming,et al.The earthquake disaster loss assessment for Wenxian MS5.0 earthquake on Jun.21,2006 inGansu Province[J].Northwest Seismological Journal,2007,29(3):256-263.
[9]姚凯,卢大伟,刘旭宙,周民都,闵祥仪.利用汶川余震流动观测资料探讨地形对峰值加速度的影响[J].西北地震学报.2009,31(1):46-50.YAO Kai,LU Dawei,Liu Xuzhou.Using observational data from the aftershocks of Wenchuan great earthquake to study the influence of geographyon peak ground acceleration[J].Northwest Seismological Journal,2009,31(1):46-50.
[10]蒋溥,戴丽思.工程地震学概论[M].北京:地震出版社,1993.JIANG Fu,DAI Lisi.Introduction to engineering seismology[M].Beijing:Earthquake Press,1983.
[11]胡聿贤.地震工程学[M].北京:地震出版社,2006.HU YuXian.Earthquake engineering[M].Beijing:Earthquake Press,2006.
[12]SUN Xiaoqing,PHILIP Jacob,A study of experimental modal analysis for seismic response assessment of underground facilities[J].InternationalJournal of Rock Mechanics and Mining Sciences,1997,34(3-4):307-307.
[2]TRIFUNAC M D,HUDSON D E,Analysis of the pacoima dam accelerogram sanFernando,California earthquake of 1971[J].Bulletin of Seismo-logical and Society of America,1971,61(5):1393-1411.
[3]BOORE D M.A note on the effect of simple topography on seismic SH waves[J].Bulletin of Seismological and Society of America,1972,62(1):275-284.
[4]BOORE D M.The effect of simple topography on seismic waves:Implications for the accelerations recorded at Pacoima Dam,San Fernando Valley,California[J].Bulletin of Seismological and Society of America,1973,63(5):1603-1609.
[5]TRIFUNAC M D.Scattering of plane SH wave by a semi-cylindrical canyon[J].Earthquake Engineering and Structural Dynamics,1973,1:267-281.
[6]王钟琦,谢君斐,石兆吉.地震工程地质导论[M].北京:地震出版社,1983.WABG Zhongqi,XIE Junpei,SHI Zhaoji.Introduction to earthquake engineering geology[M].Beijing:Earthquake Press,1983.
[7]李小军.场地土层对地震地面运动影响的分析方法[J].世界地震工程1992,8(2):49-60.LI Xiaojun,Analysis method on the influence of site soil effects on seismic ground motion[J].World Earthquake Engineering,1992,8(2):49-60.
[8]马占虎,周志宇,高晓明等.2006年甘肃文县5.0级地震灾害损失评估[J].西北地震学报.2007,29(3):256-263.MA Zhanhu,ZHOU Zhiyu,GAO Xiaoming,et al.The earthquake disaster loss assessment for Wenxian MS5.0 earthquake on Jun.21,2006 inGansu Province[J].Northwest Seismological Journal,2007,29(3):256-263.
[9]姚凯,卢大伟,刘旭宙,周民都,闵祥仪.利用汶川余震流动观测资料探讨地形对峰值加速度的影响[J].西北地震学报.2009,31(1):46-50.YAO Kai,LU Dawei,Liu Xuzhou.Using observational data from the aftershocks of Wenchuan great earthquake to study the influence of geographyon peak ground acceleration[J].Northwest Seismological Journal,2009,31(1):46-50.
[10]蒋溥,戴丽思.工程地震学概论[M].北京:地震出版社,1993.JIANG Fu,DAI Lisi.Introduction to engineering seismology[M].Beijing:Earthquake Press,1983.
[11]胡聿贤.地震工程学[M].北京:地震出版社,2006.HU YuXian.Earthquake engineering[M].Beijing:Earthquake Press,2006.
[12]SUN Xiaoqing,PHILIP Jacob,A study of experimental modal analysis for seismic response assessment of underground facilities[J].InternationalJournal of Rock Mechanics and Mining Sciences,1997,34(3-4):307-307.
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