青川县桅杆梁斜坡地震动响应监测研究
|
摘要
本文采用941B型超低频测振仪及G01通用数采仪,自2009年5月13~27日,在青川县桅杆梁监测到4次余震。对山体斜坡高程805m和875m的余震地震动峰值加速度响应监测结果分析表明:相对于805m高程,875m测点地震动峰值加速度在水平东西向以及垂向均呈减小趋势,而在水平南北向体现显著的放大效应,放大系数可达7~8倍,其FFT主频值主要集中为2~4Hz低频值。分析表明,所监测的微—有感地震震中位于测点北侧的青川断裂上,沿地震波传播方向斜坡体具有显著放大效应作用。
From May 13 to 27,2009,the seismic responses of a slope during four aftershocks of the 2008 Wenchuan Earthquake were monitored with the 941-B ultra-low-frequency vibrometer and G01 general-purpose instrument.The slope located at Wei Ganliang in Qingchuang county.The micro-seismic monitoring shows that relative to the 805 m elevation at the Wei Ganliang Mountain,the measured peak accelerations of ground motion at the 875 m elevation in the horizontal EW direction and vertical direction had the tendency of reduction.However,the measured peack accelerations in the horizontal NS direction had a significant multiplier effect.The magnification was up to 7 to 8 times.The main frequency of the amplitude spectrum focused on the low frequency range between 2.0 and 4.0 Hz.Analysis shows that the epicenter located on the north side of the NEE striking Qingchuan-Pingwu fault.Along the direction of seismic wave propagation,the slope has significant an amplification effect.
From May 13 to 27,2009,the seismic responses of a slope during four aftershocks of the 2008 Wenchuan Earthquake were monitored with the 941-B ultra-low-frequency vibrometer and G01 general-purpose instrument.The slope located at Wei Ganliang in Qingchuang county.The micro-seismic monitoring shows that relative to the 805 m elevation at the Wei Ganliang Mountain,the measured peak accelerations of ground motion at the 875 m elevation in the horizontal EW direction and vertical direction had the tendency of reduction.However,the measured peack accelerations in the horizontal NS direction had a significant multiplier effect.The magnification was up to 7 to 8 times.The main frequency of the amplitude spectrum focused on the low frequency range between 2.0 and 4.0 Hz.Analysis shows that the epicenter located on the north side of the NEE striking Qingchuan-Pingwu fault.Along the direction of seismic wave propagation,the slope has significant an amplification effect.
引文
[1]黄润秋,李为乐.“5.12″汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,27(12):2585~2592.Huang Runqiu,Liweile.Astudy on the development and distributionrules of geohazards triggered by“5.12″Wenchuan Earthquake,Jour-nal of Rock Mechanics and Engineering,2008,27(12):2585~2592.
[2]许强,黄润秋.5.12汶川大地震诱发大型崩滑灾害动力特征初探[J].工程地质学报,2008,16(16):721~730.Xu qiang,Huang Runqiu.Kinetice charateristics of large landlidestriggered by“5.12″Wenchuan Earthquake,Journal of EngineeringGeology,2008,16(16):721~730.
[3]何蕴龙,陆述远.岩石边坡地震作用近似计算方法.[J].岩土工程学报,1998,20(2):66~68.He Yunlong Lu Shuyuan.Amethod for calculating the seismic actionin rock slope[J]Chinese Journal of Geotechnical Engineering.1998,20(2):66~68.
[4]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1993.Zhang Zhuoyuan,Wang Shitian,Wang Lansheng.Engineering Geolo-gy Analysis Principle,Beijing,Geological Publishing House,1993.
[5]祁生文,伍法权,刘春玲等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792~2797.Qi Shengwen,Wu Faquan,LiuChunling,et al.Engineering geologyanalysis on stability of slope under earthquake.Chinese Journal ofRock Mechanics and Engineering,2004,23(16):2792~2797.
[6]冯希杰,金学申.场地土对基岩峰值加速度放大效应分析.[J]工程地质学报,2001,09(04):385~400.Feng Xijie Jin Xueshen.Analysis on amplification effect of bed rockpeak acceleration caused by site soil.[J]Journal of Engineering Ge-ology,2001,09(04):385~400.
[7]徐光兴,姚令侃,李朝红等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918~923.Xu Guangxing,Yao Lingkan,LiZhaohong,et al.Dynamic respone ofslopes under earthquakes and influence of ground motion parame-ters.Chinese Journal of Geotechnical Engineering,2008,30(6):918~923.
[8]李渝生,黄润秋.中国汶川特大地震损毁城镇恢复重建选址的工程地质评价[J].工程地质学报,2008,16(6):764~773.Li Yusheng,Huang Runqiu.Engineering geological assessments ofreconstruction sites for cities and towsn destroyed by WenchuanEarthquake,Journal of Engineering Geology,2008,16(6):764~773.
[9]Celebi M.Topographic and geological amplification determined fromsrong-motion and aftershock records of March1985 Chile earthquake[J].Bull.Seis.Soc.Am.1987.77:1147~1167.
[10]Hartzell S H,Carver D L,King K W.Initial investigation of siteand topographic effects at Robinwood rige,California[J],Bull.Seis.Soc.Am.1994.84:1336~1349.
[11]刘昌森,吕美丽.上海地区地震放大效应的初步探讨[J].上海地质,1998,1:8~13.Liu Changsen,Lu Meili.Preliminary analysis of the seismic ampli-fication effect in Shanghai[J].Shanghai Geology,1998,1∶8~13.
[2]许强,黄润秋.5.12汶川大地震诱发大型崩滑灾害动力特征初探[J].工程地质学报,2008,16(16):721~730.Xu qiang,Huang Runqiu.Kinetice charateristics of large landlidestriggered by“5.12″Wenchuan Earthquake,Journal of EngineeringGeology,2008,16(16):721~730.
[3]何蕴龙,陆述远.岩石边坡地震作用近似计算方法.[J].岩土工程学报,1998,20(2):66~68.He Yunlong Lu Shuyuan.Amethod for calculating the seismic actionin rock slope[J]Chinese Journal of Geotechnical Engineering.1998,20(2):66~68.
[4]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1993.Zhang Zhuoyuan,Wang Shitian,Wang Lansheng.Engineering Geolo-gy Analysis Principle,Beijing,Geological Publishing House,1993.
[5]祁生文,伍法权,刘春玲等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792~2797.Qi Shengwen,Wu Faquan,LiuChunling,et al.Engineering geologyanalysis on stability of slope under earthquake.Chinese Journal ofRock Mechanics and Engineering,2004,23(16):2792~2797.
[6]冯希杰,金学申.场地土对基岩峰值加速度放大效应分析.[J]工程地质学报,2001,09(04):385~400.Feng Xijie Jin Xueshen.Analysis on amplification effect of bed rockpeak acceleration caused by site soil.[J]Journal of Engineering Ge-ology,2001,09(04):385~400.
[7]徐光兴,姚令侃,李朝红等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918~923.Xu Guangxing,Yao Lingkan,LiZhaohong,et al.Dynamic respone ofslopes under earthquakes and influence of ground motion parame-ters.Chinese Journal of Geotechnical Engineering,2008,30(6):918~923.
[8]李渝生,黄润秋.中国汶川特大地震损毁城镇恢复重建选址的工程地质评价[J].工程地质学报,2008,16(6):764~773.Li Yusheng,Huang Runqiu.Engineering geological assessments ofreconstruction sites for cities and towsn destroyed by WenchuanEarthquake,Journal of Engineering Geology,2008,16(6):764~773.
[9]Celebi M.Topographic and geological amplification determined fromsrong-motion and aftershock records of March1985 Chile earthquake[J].Bull.Seis.Soc.Am.1987.77:1147~1167.
[10]Hartzell S H,Carver D L,King K W.Initial investigation of siteand topographic effects at Robinwood rige,California[J],Bull.Seis.Soc.Am.1994.84:1336~1349.
[11]刘昌森,吕美丽.上海地区地震放大效应的初步探讨[J].上海地质,1998,1:8~13.Liu Changsen,Lu Meili.Preliminary analysis of the seismic ampli-fication effect in Shanghai[J].Shanghai Geology,1998,1∶8~13.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心