汶川地震汉源县城高烈度异常区基岩地震动输入
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摘要
合理的地震动输入是定量解释震害和烈度异常的基础。以汉源老县城震害为评价基准,确定了汉源老县城高烈度异常区的汶川地震基岩地震动输入。基于汉源老县城周边的九襄、清溪、宜东和乌斯河4个强震台站记录,采用LSSRLI-1程序反演给出了各自台站的水平向基岩地震动;选取汉源县城典型场地,利用LSSRLI-1程序计算给出了不同强震台站基岩地震动作用下的场地地表加速度时程和反应谱,以最可能引起汉源老县城震害的强震台站基岩地震动作为汉源县城的基岩地震动输入。研究结果表明:九襄台站反演的基岩地震动最可能反映汶川地震时汉源老县城的基岩地震动特性,因而用九襄台站的基岩地震动作为汉源老县城的地震动输入解释汉源县城高烈度异常现象是合理的。本文的研究思路为定量解释震害的地震动输入确定提供了重要参考。
The reasonable input of ground motion is the basis of quantitatively explaining earthquake damage and intensity abnormality.The bedrock ground motion inputs to high-intensity abnormality area in Hanyuan old county town during Wenchuan M s 8.0 earthquake were determined according to the earthquake damage to Hanyuan old county town.Based on the strong motion records at four stations around the Hanyuan old county town,including Jiuxiang,Qingxi,Wusihe and Yidong,the horizontal bedrock ground motions at each station were back-calculated using one-dimensional equivalent linearization fluctuations program-LSSRLI-1.A typical site lying in Hanyuan old county town was selected,and its acceleration time histories and seismic response spectra of ground surface were computed under the bedrock ground motion at each station employing LSSRLI-1.The bedrock ground motions at the station,whose surface ground motion of the typical site may induce the earthquake damage to Hanyuan old county town,were taken as the earthquake inputs to Hanyuan old county town.The results show that the bedrock ground motions derived from the Jiuxiang strong ground motion station can reflect the features to that in Hanyuan old county town to quite possible extent,and thus it is the most appropriate that the bedrock ground motions derived from the Jiuxiang station are used as the earthquake inputs to Hanyuan old county town.The study ideas utilized by this paper have important referential values for acquiring earthquake inputs for explaining earthquake damage and intensity abnormality.
The reasonable input of ground motion is the basis of quantitatively explaining earthquake damage and intensity abnormality.The bedrock ground motion inputs to high-intensity abnormality area in Hanyuan old county town during Wenchuan M s 8.0 earthquake were determined according to the earthquake damage to Hanyuan old county town.Based on the strong motion records at four stations around the Hanyuan old county town,including Jiuxiang,Qingxi,Wusihe and Yidong,the horizontal bedrock ground motions at each station were back-calculated using one-dimensional equivalent linearization fluctuations program-LSSRLI-1.A typical site lying in Hanyuan old county town was selected,and its acceleration time histories and seismic response spectra of ground surface were computed under the bedrock ground motion at each station employing LSSRLI-1.The bedrock ground motions at the station,whose surface ground motion of the typical site may induce the earthquake damage to Hanyuan old county town,were taken as the earthquake inputs to Hanyuan old county town.The results show that the bedrock ground motions derived from the Jiuxiang strong ground motion station can reflect the features to that in Hanyuan old county town to quite possible extent,and thus it is the most appropriate that the bedrock ground motions derived from the Jiuxiang station are used as the earthquake inputs to Hanyuan old county town.The study ideas utilized by this paper have important referential values for acquiring earthquake inputs for explaining earthquake damage and intensity abnormality.
引文
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[13]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震研究,2005,28(2):167-171.LIU Hongshuai,BO Jingshan,WU Zhaoying,et al.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Jour-nal of Seismological Research,2005,28(2):167-171.(in Chinese)
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[17]兰景岩,刘化涤,吕悦军,等.渤海典型场地土动剪切模量比和阻尼比的统计值[J].地震研究,2012,35(2):260-267.LAN Jingyan,LIU Huadi,LV Yuejun,et al.Statistical value of dynamic shear modulus ratio and damping ration of the soils in bohai Sea[J].Jour-nal of Seismological Research,2010,35(2):260-267.(in Chinese)
[18]廖振鹏,李小军.地表土层地震反应的等效线性化解法:地震小区划[M].北京:地震出版社,1989:141-153.LIAO Zhenpeng,LI Xiaojun.Linearization method for computing earthquake response of ground layered soil:seismic microzonation[M].Beijing:Seismological Press,1989.(in Chinese)
[19]GBJ11-89建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GBJ11-89 Code for Seismic Design of Buildings[S].Bejing:China Architecture&Building Press,1989.(in Chinese)
[20]齐文浩.汶川地震中汉源烈度异常区场地特征研究[R].哈尔滨:哈尔滨工程大学,2011.QI Wenhao.Analysis on the site’property of Hanyuan County Town during 2008 Wenchuan earthquake[R].Harbin:Harbin Engineering Universi-ty,2011.(in Chinese)
[2]高孟潭,陈学良,俞言祥,等.“5.12”汶川8.0级地震汉源烈度异常机理的初步探索[J].震灾防御技术,2008,3(3):216-223.GAO Mengtan,CHEN Xueliang,YU Yanxiang,et al.Preliminary discussion on intensity anomalous mechanism of Hanyuan Town in 5.12 Wen-chuan earthquake[J].Technology for Earthquake Disaster Prevention,2008,3(3):216-223.(in Chinese)
[3]薄景山,齐文浩,刘红帅,等.汶川特大地震汉源烈度异常原因的初步分析[J].地震工程与工程振动,2009,29(6):53-64.BO Jingshan,QI Wenhao,LIU Hongshuai,et al.Abnormality of seismic intensity in Hanyuan during Wenchuan earthquake[J].Journal of Earth-quake Engineering and Engineering Vibration,2009,29(6):53-64.(in Chinese)
[4]齐文浩,薄景山,郭迅,等.汶川地震中一个特殊场地研究初探[J].地震工程与工程振动,2010,30(3):53-58.QI Wenhao,BO Jingshan,GUO Xun,et al.Preliminary study on a special site in Wenchuan earthquake[J].Journal of Earthquake Engineeringand Engineering Vibration,2010,30(3):53-58.(in Chinese)
[5]雷东宁,蔡永建,李恒,等.汶川8.0级特大地震汉源县震害特点与烈度异常成因探讨[J].四川地震,2011(4):35-39.LEI Dongning,CAI Yongjian,LI Heng,et al.The earthquake disaster characteristic and cause discussion about Hanyuan abnormal intensity fromthe 2008 Wenchuan M 8.0 earthquake[J].Earthquake in Sichuan,2011(4):35-39.(in Chinese)
[6]李平,薄景山,齐文浩,等.土层结构对汉源烈度异常的影响[J].地震学报,2012,34(6):1-7.LI Ping,BO Jingshan,QI Wenhao,et al.Effects of soil structure on abnormal intensity in Hanyuan old town[J].Acta Seismologica Sinica,2012,34(6):1-7.(in Chinese)
[7]中国地震局震害防御司.汶川8.0级地震未校正加速度记录[M].北京:地震出版社,2008.Earthquake Disaster Prevention and Mitigation Division of CEA.Uncorrected acceleration recordings of Wenchuan earthquake[M].Beijing:Seismo-logical Press,2008.(in Chinese)
[8]胡聿贤.地震工程学[M].2版.北京:地震出版社,2006.HU Yuanxian.Earthquake engineering[M].2nd ed.Beijing:Seismological Press,2006.(in Chinese)
[9]GB/T182083-2000地震现场工作——第三部分:调查规范[S].北京:中国标准出版社,2000.GB/T182083-2000 Post-Earthquake Field Works——Part 3:Code for Field Survey[S].Beijing:China Standard Press,2000.(in Chinese)
[10]卢滔,薄景山,李巨文,等.汶川大地震汉源县城建筑物震害调查[J].地震工程与工程振动,2009,29(6):88-95.LU Tao,BO Jingshan,LI Juwen,et al.Damage to buildings in Hanyuan county town during 2008 Ms 8.0 Wenchuan earthquake[J].Journal ofEarthquake Engineering and Engineering Vibration,2009,29(6):88-95.(in Chinese)
[11]胡少伟,牛志国,陆俊.码头成层地基中地震动的非线性反演方法[J].水运工程,2010(4):7-10.HU Shaowei,NIU Zhiguo,LU Jun.Nonlinear in version method of ground motion in layered soil of a quay[J].Port&Waterway Engineering,2010(4):7-10.(in Chinese)
[12]孙静,袁晓铭,孙锐.土动剪切模量和阻尼比的推荐值和规范值的合理性比较[J].地震工程与工程振动,2004,24(2):125-133.SUN Jing,YUAN Xiaoming,SUN Rui.Reasonability comparison between recommended and code values of dynamic shear modulus and dampingratio of soils[J].Journal of Earthquake Engineering and Engineering Vibration,2004,24(2):125-133.(in Chinese)
[13]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震研究,2005,28(2):167-171.LIU Hongshuai,BO Jingshan,WU Zhaoying,et al.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Jour-nal of Seismological Research,2005,28(2):167-171.(in Chinese)
[14]DB001-94工程场地地震安全性评价工作规范[S].北京:地震出版社,1994.DB001-94 Code for Seismic Safety Evaluation of Engineering Sites[S].Beijing:Seismological Press,1994.(in Chinese)
[15]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-139.YUAN Xiaoming,SUN Rui,SUN Jing,et al.Laboratory experimental study on dynamic shear modulus ratio and damping ratio of soils[J].Journalof Earthquake Engineering and Engineering Vibration,2000,20(4):133-139.(in Chinese)
[16]兰景岩,吕悦军,彭艳菊,等.渤海海域典型场地土的动力学特征[J].世界地震工程,2011,27(3):24-31.LAN Jingyan,LV Yuejun,PENG Yanju,et al.The soil dynamic parameters of Bohai Sea floor[J].World Earthquake Engineering,2011,27(3):24-31.(in Chinese)
[17]兰景岩,刘化涤,吕悦军,等.渤海典型场地土动剪切模量比和阻尼比的统计值[J].地震研究,2012,35(2):260-267.LAN Jingyan,LIU Huadi,LV Yuejun,et al.Statistical value of dynamic shear modulus ratio and damping ration of the soils in bohai Sea[J].Jour-nal of Seismological Research,2010,35(2):260-267.(in Chinese)
[18]廖振鹏,李小军.地表土层地震反应的等效线性化解法:地震小区划[M].北京:地震出版社,1989:141-153.LIAO Zhenpeng,LI Xiaojun.Linearization method for computing earthquake response of ground layered soil:seismic microzonation[M].Beijing:Seismological Press,1989.(in Chinese)
[19]GBJ11-89建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GBJ11-89 Code for Seismic Design of Buildings[S].Bejing:China Architecture&Building Press,1989.(in Chinese)
[20]齐文浩.汶川地震中汉源烈度异常区场地特征研究[R].哈尔滨:哈尔滨工程大学,2011.QI Wenhao.Analysis on the site’property of Hanyuan County Town during 2008 Wenchuan earthquake[R].Harbin:Harbin Engineering Universi-ty,2011.(in Chinese)
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