基于瑞雷波法的都江堰市区场地剪切波速结构
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摘要
场地剪切波速是建筑抗震设计中不可缺少的基础资料。因此,本文通过多道面波法对都江堰市区进行了剪切波速调查,为都江堰市区的建筑抗震设计及汶川地震的进一步研究提供基本数据。文中利用多道面波分析方法在都江堰市区(E:103°35’～103°41’,N:30°57’～31°02’)布置了35个面波测点进行场地剪切波速结构和覆盖层厚度的调查,测点间距约2 km。获得了都江堰市区场地等效剪切波速(VS20)和场地覆盖层厚度分布。结果显示,都江堰市区的等效剪切波速介于267m/s与389 m/s之间;覆盖层厚度在6～20 m之间。另外,本文利用欧美规范的方法计算了都江堰市区的5 m至20 m的平均剪切波速(TAV),通过对比各个深度的平均剪切波速发现,各个深度的平均剪切波速和VS20具有较高的线性相关性。利用这一特征,本文建立了都江堰市区利用不同深度的平均剪切波速估计VS20的经验公式(VS20=(a±Δa)+(b±Δb).VSz+σ)。利用这一经验关系式可以在都江堰市区钻孔深度或其它测试深度达不到20 m的情况下估计VS20。
Shear wave velocity structure of shallow site is essential to earthquake engineering research.In order to provide the basic materials of equivalent shear wave velocity and overburden of this area for some further researches,a multi-channel analysis of surface wave method was applied to this area(E:103°35'～103°41',N:30°57'～31°02').35 survey points were evenly distributed in the area with the point space about 2km.The equivalent shear wave velocity and overburden thickness of this area were obtained.The result shows that the equivalent shear wave velocity is ranging from 267 m/s to 389 m/s.The overburden thickness of the area is ranging from 6 m to 20 m.In addition,by comparing the time-averaged shear wave velocity(TAV) of the upper 20 meters to VS20,we find that the TAVs of that upper 20 meters are linearly correlated to that of 20 meter(VS20).Using this feature,a set of formulas for(VS20) and Vsz(VS20=(a±Δa)+(b±Δb)·VSz+σ) is worked out in this paper,which can be used to evaluate the VS20 when VS20 is not available.
Shear wave velocity structure of shallow site is essential to earthquake engineering research.In order to provide the basic materials of equivalent shear wave velocity and overburden of this area for some further researches,a multi-channel analysis of surface wave method was applied to this area(E:103°35'～103°41',N:30°57'～31°02').35 survey points were evenly distributed in the area with the point space about 2km.The equivalent shear wave velocity and overburden thickness of this area were obtained.The result shows that the equivalent shear wave velocity is ranging from 267 m/s to 389 m/s.The overburden thickness of the area is ranging from 6 m to 20 m.In addition,by comparing the time-averaged shear wave velocity(TAV) of the upper 20 meters to VS20,we find that the TAVs of that upper 20 meters are linearly correlated to that of 20 meter(VS20).Using this feature,a set of formulas for(VS20) and Vsz(VS20=(a±Δa)+(b±Δb)·VSz+σ) is worked out in this paper,which can be used to evaluate the VS20 when VS20 is not available.
引文
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[9]王凤林,李勇,李永昭,等.都江堰市区新生代大邑砾岩的沉积特征[J].成都理工大学学报:自然科学版,2003,30(2):139-146.WANG Fenglin,LI Yong,LI Yongzhao,et al.Sedmentary characteristics of the cenozoic dayi conglomerate in Chengdu basin[J].Journal ofChengdu University of Technology:Science&Technology Edition,2003,30(2):139-146.(in Chinese)
[10]师黎静,陶夏新,Robert Kayen,等.场地瑞利波频散特性的测试方法研究[J].地震工程与工程振动,2005,25(6):24-29.SHI Lijing,TAO Xiaxin,Robert Kayen,et al.Study on evaluation methods for Rayleigh wave dispersion characteristic[J].Journal of EarthquakeEngineering and Engineering Vibration,2005,25(6):24-29.(in Chinese)
[11]陈国兴,陈继华.地震动输入界面的选取对深软场地地震效应的影响[J].世界地震工程,2005,21(2):36-42.CHEN Guoxing,CHEN Jihua.A study on the influence of seismic wave inputing interface on the earthquake response of deep soft sites[J].WorldEarthquake Engineering,2005,21(2):36-42.(in Chinese)
[12]王超凡,邹桂高,刘金光,等.多道瞬态瑞雷波勘探应用研究[J].地质科学,37(1):110-117.WANG Chaofan,ZOU Guigao,LIU Jinguang,et al.Studay on application of multichannel transient R wave exploration[J].Chinese Journal of Ge-ology,37(1):110-117.(in Chinese)
[13]郭恩,周锡元.汶川地震盆地效应的思考与建议[J].防灾减灾工程学报,2010,30(4):459-465.GUO En,ZHOU Xiyuan.Study on Basin Effects of Wenchuan Earthquake[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(4):459-465.(in Chinese)
[14]黄雅虹,吕悦军,兰景岩,等.工程场地分类中等效剪切波速计算深度问题的讨论[J].地震地质,2010,32(2):312-319.HUANG Yahong,LU Yuejun,LAN Jingyan,et al.Discussion on the issue of proper depth in calculating equivalent shear wave velocity for siteclassification[J].Seismology and Geology,2010,32(2):312-319.(in Chinese)
[15]卢建旗,李山有,谢志南,等.基于瑞雷波法的成都盆地场地剪切波速结构的确定[J].地震工程与工程震动,2012,32(2):35-40.LU Jianqi,LI Shanyou,XIE Zhinan,et al.Multi-Channel analysis of surface save method based determination of S-wave velocity structure ofChengdu Basin[J].Journal of Earthquake Enginneering and Enginnering Vibration,2012,32(2):35-40.(in Chinese)
[16]Boore D M.Estimating Vs(30)(or NEHRP site classes)from shallow velocity models(depths<30 m)[J].Bulletin of the Seismological Socie-ty of America,2004,94(2):591-597.
[2]黄东升,张志强,毛龙泉.汶川地震后绵竹、都江堰市房屋震害调查与分析[J].防灾减灾工程学报,2010,30(1):109-116.HUANG Dongsheng,ZHANG Zhiqiang,MAO Longquan.Investigations of building damages in Mianzhu and Dujiangyan due to 5.12 Wenchuanearthquake[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(1):109-116.(in Chinese)
[3]周浪,黄青松.从5.12地震后什邡、都江堰村镇房屋受损调查引发的思考[J].工程抗震与加固改造,2010,32(2):122-125.ZHOU Lang,HUANG Qingsong.Discussions of investigation about house damages in rural areas in Shifang and Dujiangyan after the“5.12”Earth-quake[J].Earthquake Resistant Engineering and Retrofitting,2010,32(2):122-125.(in Chinese)
[4]蔡文章.汶川地震都江堰地区建筑震害情况分析[J].建筑技术,2009,40(6):531-534.CAI Wenzhang.Analysis on seismic disaster of buildings in Dujiangyan during the Wenchuan earthquakf[J].Architecture Technology,2009,40(6):531-534.(in Chinese)
[5]Park C B,Miller R D,Xia Jianghai.Multichannel analysis of surface waves[J].Geophysics,1999,64(3):800-808.
[6]Xia Jianghai,Miller R D,Park C B.Estimation of nearsurface shearwave velocity by inversion of Rayleigh waves[J].Geophysics,1999,64(3):691-700.
[7]李勇,周荣军,Densmore A L,等.青藏高原东缘龙门山晚新生代走滑挤压作用的沉积响应[J].沉积学报,2006,24(2):309-311.LI Yong,ZHOU Rongjun,Densmore A L,et al.Sedimentary responses to late cenozoic thrusting and strikeslipping of Longmen Shan along easternmargin of Tibetan Plateau[J].Acta Sedimentologica Sinica,2006,24(2):309-311.(in Chinese)
[8]李海兵,王宗秀,付小方,等.2008年5月12日汶川地震(Ms8.0)地表破裂带的分布特征[J].中国地质,2008,35(5):803-813.LI Haibing,WANG Zongxiu,FU Xiaofang,et al.The surface rupture zone distribution of the Wenchuan earthquake(Ms8.0)happened on May12th 2008[J].Geology in China,2008,35(5):803-813.(in Chinese)
[9]王凤林,李勇,李永昭,等.都江堰市区新生代大邑砾岩的沉积特征[J].成都理工大学学报:自然科学版,2003,30(2):139-146.WANG Fenglin,LI Yong,LI Yongzhao,et al.Sedmentary characteristics of the cenozoic dayi conglomerate in Chengdu basin[J].Journal ofChengdu University of Technology:Science&Technology Edition,2003,30(2):139-146.(in Chinese)
[10]师黎静,陶夏新,Robert Kayen,等.场地瑞利波频散特性的测试方法研究[J].地震工程与工程振动,2005,25(6):24-29.SHI Lijing,TAO Xiaxin,Robert Kayen,et al.Study on evaluation methods for Rayleigh wave dispersion characteristic[J].Journal of EarthquakeEngineering and Engineering Vibration,2005,25(6):24-29.(in Chinese)
[11]陈国兴,陈继华.地震动输入界面的选取对深软场地地震效应的影响[J].世界地震工程,2005,21(2):36-42.CHEN Guoxing,CHEN Jihua.A study on the influence of seismic wave inputing interface on the earthquake response of deep soft sites[J].WorldEarthquake Engineering,2005,21(2):36-42.(in Chinese)
[12]王超凡,邹桂高,刘金光,等.多道瞬态瑞雷波勘探应用研究[J].地质科学,37(1):110-117.WANG Chaofan,ZOU Guigao,LIU Jinguang,et al.Studay on application of multichannel transient R wave exploration[J].Chinese Journal of Ge-ology,37(1):110-117.(in Chinese)
[13]郭恩,周锡元.汶川地震盆地效应的思考与建议[J].防灾减灾工程学报,2010,30(4):459-465.GUO En,ZHOU Xiyuan.Study on Basin Effects of Wenchuan Earthquake[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(4):459-465.(in Chinese)
[14]黄雅虹,吕悦军,兰景岩,等.工程场地分类中等效剪切波速计算深度问题的讨论[J].地震地质,2010,32(2):312-319.HUANG Yahong,LU Yuejun,LAN Jingyan,et al.Discussion on the issue of proper depth in calculating equivalent shear wave velocity for siteclassification[J].Seismology and Geology,2010,32(2):312-319.(in Chinese)
[15]卢建旗,李山有,谢志南,等.基于瑞雷波法的成都盆地场地剪切波速结构的确定[J].地震工程与工程震动,2012,32(2):35-40.LU Jianqi,LI Shanyou,XIE Zhinan,et al.Multi-Channel analysis of surface save method based determination of S-wave velocity structure ofChengdu Basin[J].Journal of Earthquake Enginneering and Enginnering Vibration,2012,32(2):35-40.(in Chinese)
[16]Boore D M.Estimating Vs(30)(or NEHRP site classes)from shallow velocity models(depths<30 m)[J].Bulletin of the Seismological Socie-ty of America,2004,94(2):591-597.
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