土壤剪切波速与埋深关系的统计分析
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摘要
为解决工程中剪切波速测试不能达到工作要求深度的问题,文中根据大量黑龙江地区的地震安全性评价资料,运用主要的经验公式:线性拟合Y=a+bX;多项式拟合Y=a+bX+cX2;指数拟合Y=aXb,分别统计了土壤剪切波速与埋深之间的关系,给出回归参数及适用深度。结果表明:(1)剪切波速与杂填土土层深度无论采用何种方式回归,都得不到令人满意的结果;(2)除粗砂多项式拟合方式略好于线性拟合方式外,各土类剪切波速与土层深度的关系采用线性拟合方式要优于多项式和指数拟合方式;(3)采用多项式和指数拟合方式也可以得到比较令人满意的结果;(4)除粘土(可塑、软塑)外,采用多项式拟合方式要略优于指数拟合方式。结果可为今后黑龙江地区工程场地分类,抗震设防小区化提供参考依据。
Measuring shear wave velocity often can not reach the standard required depth in engineering.To cope with this problem,based on seismic safety evaluation data of Heilongjiang,three relationships between shear wave velocities and soil depths are analyzed.The primary empirical formule are the linear fitting Y=a+bX,polynomial fitting Y=a+bX+cX2 and exponential fitting Y=aXb,and the regression parameters and applicable depths were provided.The results show that(1)it is not satisfied by whatever means of regression analysis between the shear wave velocities and miscellaneous filled-soil depths;(2)for most kinds of soil,linear fitting method is better than both the polynomial fitting method and exponential fitting method except for rough sand;for rough sand,the polynomial fitting method is a bit of better than linear fitting method;(3)it also leads to satisfactory results by the polynomial fitting method and exponential fitting method;(4)aside from clay(plastic,soft plastic),polynomial fitting method is a bit of better than exponential fitting method.The results provide the basis for the classification of engineering site and seismic microzonation in Heilongjiang area.
Measuring shear wave velocity often can not reach the standard required depth in engineering.To cope with this problem,based on seismic safety evaluation data of Heilongjiang,three relationships between shear wave velocities and soil depths are analyzed.The primary empirical formule are the linear fitting Y=a+bX,polynomial fitting Y=a+bX+cX2 and exponential fitting Y=aXb,and the regression parameters and applicable depths were provided.The results show that(1)it is not satisfied by whatever means of regression analysis between the shear wave velocities and miscellaneous filled-soil depths;(2)for most kinds of soil,linear fitting method is better than both the polynomial fitting method and exponential fitting method except for rough sand;for rough sand,the polynomial fitting method is a bit of better than linear fitting method;(3)it also leads to satisfactory results by the polynomial fitting method and exponential fitting method;(4)aside from clay(plastic,soft plastic),polynomial fitting method is a bit of better than exponential fitting method.The results provide the basis for the classification of engineering site and seismic microzonation in Heilongjiang area.
引文
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[7]苏旭,杨丽萍,邹海宁.西宁市区土层剪切波速随深度变化特征[J].高原地震[J],2009,21(2):12-16.SU Xu,YANG Liping,ZOU Haining Characteristics of shearing wave velocity changed with depth of soil layer in Xinning urban arer[J].PlateauEarthquake Researth,2009,21(2):12-16.
[8]刘红帅,郑桐,薄景山,等.粘性土剪切波速不确定性的统计分析[J].世界地震工程,2010,26(增):99-103.LIU Hongshuai,ZHENG Tong,BO Jingshan,et al.Statistical analysis of uncertainty for shear wave velocities of cohesanive soils[J].World Earth-quake Engineering,2010,26(suppl):99-103.
[2]兰景岩,薄景山,吕悦军.剪切波速对设计反应谱的影响研究[J].震灾防御技术,2007,2(1):19-24.LAN Jingyan,BO Jingshan,LU Yuejun.Study on the effect of shear wave velocity on the design spectrum[J].Technology for Earthquake DisasterPrevention,2007,2(1):19-24.
[3]高玉峰,刘汉龙,朱伟,等.剪切波速对砂土层地震反应的影响[J].工程勘察,2001,1(1):39-42.GAO Yufeng,LIU Hanlong,ZHU Wei,et al.Effects of shear wave velocity on seismic response of sand[J].Geotechnical Investigations&Survey-ing,2001,1(1):39-42.
[4]程国勇,王建华.应用剪切波速判别砂土液化的研究综述[J].世界地震工程,2004,20(1):112-116.CHENG Guoyong,WANG Jianhua.Summary on the study of liquefaction evaluation by shear wave velocity[J].World Earthquake Engineering,2004,20(1):112-116.
[5]齐文浩,刘德东,张宇东,等.剪切波速推测的工程应用[J].防灾科技学院学报,2007,9(4):17-20.QI Wenhao,LIU Dedong,ZHANG Yudong,et al.Engineering applying of shear wave inferring[J].Journal of Institute of Disaster-Prevention Sci-ence and Technology,2007,9(4):17-20.
[6]战吉艳,陈国兴,刘建达.苏州城区深软场地土剪切波速与土层深度的经验关系[J].世界地震工程,2009,25(2):12-17.ZHAN Jiyan,CHEN Guoxing,LIU Jianda.Empirical relationship between shear wave velocity and soil depth on deep soft sites in urban area ofSuzhou city[J].World Earthquake Engineering,2009,25(2):12-17.
[7]苏旭,杨丽萍,邹海宁.西宁市区土层剪切波速随深度变化特征[J].高原地震[J],2009,21(2):12-16.SU Xu,YANG Liping,ZOU Haining Characteristics of shearing wave velocity changed with depth of soil layer in Xinning urban arer[J].PlateauEarthquake Researth,2009,21(2):12-16.
[8]刘红帅,郑桐,薄景山,等.粘性土剪切波速不确定性的统计分析[J].世界地震工程,2010,26(增):99-103.LIU Hongshuai,ZHENG Tong,BO Jingshan,et al.Statistical analysis of uncertainty for shear wave velocities of cohesanive soils[J].World Earth-quake Engineering,2010,26(suppl):99-103.
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