地脉动测试及其在场地评价中的应用
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摘要
介绍了地脉动的原理、测试方法及其影响因素,通过工程实例,阐述了场地卓越周期的测定及其在场地及场地土判定与评价中的应用,分析了不同场地条件对地脉动频谱特性的影响。结果表明通过地脉动测试确定场地卓越周期的效果较为理想,其在场地及场地土判定与评价中的结果与利用剪切波速和覆盖层厚度划分结果基本一致;场地岩土层结构直接影响地脉动的频谱特性,二者的变化相对应。
The principle,test method and causes of ground microtremors are introduced.According to engineering examples,the determination for the predominant period of a site is described,as well as its application in evaluation for the category of the site and soil,and the effect of different site conditions on the characteristics of frequency spectrum are analyzed.The results are shown that there is a good result for determinating the predominant period through ground microtremor testing,and the conclusion derived by the predominant period in the evaluation of the site and soil is similar to that by the equivalent shear wave and the thickness of overburden layer.The rock and soil structure markly affect the frequency spectra of the ground microtremors,and the corresponding relationships between them are existed.
The principle,test method and causes of ground microtremors are introduced.According to engineering examples,the determination for the predominant period of a site is described,as well as its application in evaluation for the category of the site and soil,and the effect of different site conditions on the characteristics of frequency spectrum are analyzed.The results are shown that there is a good result for determinating the predominant period through ground microtremor testing,and the conclusion derived by the predominant period in the evaluation of the site and soil is similar to that by the equivalent shear wave and the thickness of overburden layer.The rock and soil structure markly affect the frequency spectra of the ground microtremors,and the corresponding relationships between them are existed.
引文
[1]许建聪,简文彬,尚岳全,等.地脉动在福州市区地基土层场地评价中的应用[J].岩石力学与工程学报,2004,23(17):3014-3020.XUJiancong,JIAN Wenbin,SHANG Yuequan,et al.Application of microtremor to site evaluation in Fuzhou[J].Chinese Journal of Rock Me-chanics and Engineering,2004,23(17):3014-3020.
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[9]CECS74:95场地微振动测量技术规程建设部综合勘察研究院[S].北京:中国计划出版社,1996.CECS74:95 Technique Mannual For microvibrations Test of Site[S].Beijing:China Planning Press,1996.
[10]李玉銮.周边场地及建筑物对地脉动测试影响的探讨[J].福建建筑,2006,100(4):75-77.LI Yuluan.A study of the effect to the ground-micro-tremor-signals by structrues and ground[J].Fujian Architecture&Construction,2006,100(4):75-77.
[11]许建聪,简文彬,尚岳全,等.地脉动产生机理和传播特性的研究[J].浙江大学学报(工学版),2005,39(1):33-38.XUJiancong,JIAN Wenbin,SHANG Yuequan,et al.Study on formation mechanism and propagating characteristics of ground micro-tremor[J].Journal of Zhejiang University(Engineering Science),2005,39(1):33-38.
[12]罗明远.高层建筑岩土工程勘察中波速测试与卓越周期的探讨[J].西部探矿工程,2007,(5):168-170.LUO Mingyuan.Study on shear wave test and predominant period of geotechnical engineering investigation of high building[J].Western Explora-tion Engineering,2007,(5):168-170.
[2]郭明珠,任凤华.工程场地动力特性分析的地脉动法[J].世界地震工程,2005,4(21):139-142.GUO Mingzhu,RENFenghua.The microtremor methods for dynamics measurement of site[J].World Earthouake Engineering,2005,21(4):139-142.
[3]郭明珠,谢礼立,高尔根,等.利用地脉动进行场地反应分析研究综述[J].世界地震工程,1999,3(15):14-19.GUO Mingzhu,XIE Lili,GAO Ergen,et al.Review for anaiysis of site response by microtremos[J].World Earthquake Engineering,1999,3(15):14-19.
[4]王锺琦,张荣祥,汪敏,等.地震区工程选址手册[M].北京:中国建筑工业出版社,1994.WANG Zhongqi,ZHANG Rongxiang,WANG Min,et al.Mannual for siting in earthquake zones[M].Beijing:China Building Industry Press,1994.
[5]胡钧,杜坚.上海场地土的脉动特性及剪切波速特征[J].物探与化探,1997,21(4):305-307.HU Jun.DUJian,Pulsation and shear wave velo city characteristics of soil in a certain field of Shanghai[J].Geophysical and Geochemical Explora-tion.2009,7(1):122-124.
[6]简文彬,李哲生,黄真萍,等.福建沿海地区地微动的谱结构特征[J].工程地质学报,2002,10(2):216-219.JIAN Wenbin,LI Zhesheng,HUANG Zhenping,et al.On the spectral characteristics of ground microtremor in coastal area of Fujian[J].Journal ofEngineering Geology,2002,10(2):216-219.
[7]黄蕾,方云,严绍军,等.地脉动测试测定场地的卓越周期[J].水利与建筑工程学报,2009,7(1):122-124.HUANG Lei,FANG Yun,YAN Shaojun,et al,Determination for predominant period of site by earth pulse test[J].Joumal of Water Resources andArchitectural Engineering,2009,7(1):122-124.
[8]李昊.地脉动测试分析技术与工程应用[J].勘察科学技术,2000,(6):59-62.LI Hao.Technioue of microtremor measurement andanal ysis and its engineering application[J].Scientific Investigation Technique,2000,(6):59-62.
[9]CECS74:95场地微振动测量技术规程建设部综合勘察研究院[S].北京:中国计划出版社,1996.CECS74:95 Technique Mannual For microvibrations Test of Site[S].Beijing:China Planning Press,1996.
[10]李玉銮.周边场地及建筑物对地脉动测试影响的探讨[J].福建建筑,2006,100(4):75-77.LI Yuluan.A study of the effect to the ground-micro-tremor-signals by structrues and ground[J].Fujian Architecture&Construction,2006,100(4):75-77.
[11]许建聪,简文彬,尚岳全,等.地脉动产生机理和传播特性的研究[J].浙江大学学报(工学版),2005,39(1):33-38.XUJiancong,JIAN Wenbin,SHANG Yuequan,et al.Study on formation mechanism and propagating characteristics of ground micro-tremor[J].Journal of Zhejiang University(Engineering Science),2005,39(1):33-38.
[12]罗明远.高层建筑岩土工程勘察中波速测试与卓越周期的探讨[J].西部探矿工程,2007,(5):168-170.LUO Mingyuan.Study on shear wave test and predominant period of geotechnical engineering investigation of high building[J].Western Explora-tion Engineering,2007,(5):168-170.
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