常规土类剪切波速与埋深的关系分析
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摘要
土体剪切波速是土工地震减灾工程应用最广泛的参量之一。依据中国地震安评工作大量的钻孔实测剪切波速数据,定性探讨了常规土类剪切波速与埋深间的关系;利用最小二乘法分别采用线性模型、指数模型和一元二次多项式模型建立了分场地类别和不分场地类别两种情况下常规土类(不包括淤泥质土)–碎石土、砂土、粉土和黏性土剪切波速与埋深间的统计公式,以拟合优度为评价指标建议了常规土类的推荐模型及参数,并与《构筑物抗震设计规范》的经验公式及某一工程场地实测结果进行了对比分析。结果表明:除淤泥质土之外,其它常规土类剪切波速与埋深有显著的相关性;总体而言,一元二次多项式模型的拟合精度最高,所推荐的常规土类(不包括淤泥质土)剪切波速与埋深间的统计公式是较可靠的,可供无波速测试场地参考使用。
The shear wave velocity of soils is one of the most widely used parameters in the field of geotechnical earthquake engineering.Based on the measured data of shear wave velocity of soils from lots of boreholes obtained during seismic safety evaluation of engineering sites in China,the relationship between shear wave velocity and depth of soils is qualitatively discussed,and the regression equations of shear wave velocity and depth of conventional soils,including gravelly soil,sandy soil,silt,and cohesive soil,considering site classification and without considering site classification,except of muddy soil,are established by using three statistical models of the first-order linear equation,exponent equation and polynomial in one variable with two-order,respectively.The goodness of fitting is taken as an evaluation index to acquire the recommended models and parameters between shear wave velocity and depth of conventional soils,except of muddy soil.The equations recommended are compared with the formula in the Chinese design code for earthquake resistance of special structures(GB50191-93).In addition,the results of shear wave velocity of some real site predicted using the recommended equations are compared with those of site measurement.The above results show that there is a remarkable relationship between the shear wave velocity and the depth of conventional soils,except of muddy soil,that the fitting accuracy of polynomial in one variable with two-order is the highest on the whole and that the regression equations of shear wave velocity and depth of most of conventional soils are more reliable,which can be used as a reference for sites,whose shear wave velocities are not tested.
The shear wave velocity of soils is one of the most widely used parameters in the field of geotechnical earthquake engineering.Based on the measured data of shear wave velocity of soils from lots of boreholes obtained during seismic safety evaluation of engineering sites in China,the relationship between shear wave velocity and depth of soils is qualitatively discussed,and the regression equations of shear wave velocity and depth of conventional soils,including gravelly soil,sandy soil,silt,and cohesive soil,considering site classification and without considering site classification,except of muddy soil,are established by using three statistical models of the first-order linear equation,exponent equation and polynomial in one variable with two-order,respectively.The goodness of fitting is taken as an evaluation index to acquire the recommended models and parameters between shear wave velocity and depth of conventional soils,except of muddy soil.The equations recommended are compared with the formula in the Chinese design code for earthquake resistance of special structures(GB50191-93).In addition,the results of shear wave velocity of some real site predicted using the recommended equations are compared with those of site measurement.The above results show that there is a remarkable relationship between the shear wave velocity and the depth of conventional soils,except of muddy soil,that the fitting accuracy of polynomial in one variable with two-order is the highest on the whole and that the regression equations of shear wave velocity and depth of most of conventional soils are more reliable,which can be used as a reference for sites,whose shear wave velocities are not tested.
引文
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[3]程祖锋,李萍,李燕,等.深圳地区部分岩土类型剪切波速与深度的关系分析[J].工程地质学报,1997,5(2):163–168.(CHENG Zu-feng,LI Ping,LI Yan,et al.Analysis of relationship between shear wave velocity and depth of some types of soil and rock in Shenzhen Region[J].Journal of Engineering Geology,1997,5(2):163–168.(in Chinese)).
[4]陈国兴,徐建龙,袁灿勤.南京城区岩土体剪切波速与土层深度的关系[J].南京建筑工程学院学报,1998,45(2):32–37.(CHEN Guo-xing,XU Jian-long,YUAN Can-qin.Relation between depth and shear wave velocity of soil and bedrock in Nanjing city[J].Journal of Nanjing Architectural and Civil Engineering Institute,1998,45(2):32–37.(in Chinese))
[5]高玉峰,刘汉龙.合肥膨胀土剪切波速的特征分析[J].岩土工程学报,2003,25(3):371–373.(GAO Yu-feng,LIU Han-long.Study on shear wave velocities in expensive soils of Hefei[J].Chinese Journal of Geotechnical Engineering,2003,25(3):371–373.(in Chinese))
[6]周锡元,王广军,苏经宇.场地.地基.设计地震[M].北京:地震出版社,1990.(ZHOU Xi-yuan,WANG GUANG-jun,SU Jing-yu.Site foundation design earthquake[M].Beijing:Earthquake Press,1990.(in Chinese))
[7]李存志,李向新,姚明波,等.昆明盆地剪切波速与地基特性相关分析研究[J].昆明冶金高等专科学校学报,2006,22(3):1–5.(LI Cun-zhi,LI Xiang-xin,YAO Ming-bo,et al.Correlation analyses between shear wave velocity and ground properties and Kunming Basin[J].Journal of Kuming Metallurgy College,2006,22(3):1–5.(in Chinese))
[8]蔺宝云,简文彬.福州盆地土层S波波速特征及分布规律[J].岩土工程界,2005,8(10):27–29.(LAN Bao-yun,JIAN Wen-bin.Shear velocity characteristics and distribution of soil in Fuzhou Basin[J].Journal of Geotechnical World,2005,8(10):27–29.(in Chinese))
[9]钟晓鸣,万小笠.Excel在统计分析中的应用[M].北京:科学出版社,2009.(ZHONG Xiao-ming,WANG Xiao-li.Application of EXCEL in statistical analysis[M].Beijing:Science Press,2009.(in Chinese))
[10]GB50191—93构筑物抗震设计规范[S].1993.(GB50191—93 Design code for antiseismic of special structures[S].1993.(in Chinese))
[11]GB17741—2005工程场地地震安全性评价[S].2005.(GB17741—2005 Scismic safety assessment of angineering site[S].2005.(in Chinese))
[12]GB50021—94.岩土工程勘察规范[S].1995.(GB50021—94 Code for investigation of geotechnical engineering[S].1995.(in Chinese))
[2]王广军,苏经宇.连云港碱厂层状土剪切波速沿深度变化的推测[J].勘察科学技术,1986(3):35–38.(WANG Guang-jun,SU Jing-yu.Prediction of shear wave velocity along depth of soils in Lianyugang alkali factory[J].Site Investigation Science and Technology,1986(3):35–38.(in Chinese))
[3]程祖锋,李萍,李燕,等.深圳地区部分岩土类型剪切波速与深度的关系分析[J].工程地质学报,1997,5(2):163–168.(CHENG Zu-feng,LI Ping,LI Yan,et al.Analysis of relationship between shear wave velocity and depth of some types of soil and rock in Shenzhen Region[J].Journal of Engineering Geology,1997,5(2):163–168.(in Chinese)).
[4]陈国兴,徐建龙,袁灿勤.南京城区岩土体剪切波速与土层深度的关系[J].南京建筑工程学院学报,1998,45(2):32–37.(CHEN Guo-xing,XU Jian-long,YUAN Can-qin.Relation between depth and shear wave velocity of soil and bedrock in Nanjing city[J].Journal of Nanjing Architectural and Civil Engineering Institute,1998,45(2):32–37.(in Chinese))
[5]高玉峰,刘汉龙.合肥膨胀土剪切波速的特征分析[J].岩土工程学报,2003,25(3):371–373.(GAO Yu-feng,LIU Han-long.Study on shear wave velocities in expensive soils of Hefei[J].Chinese Journal of Geotechnical Engineering,2003,25(3):371–373.(in Chinese))
[6]周锡元,王广军,苏经宇.场地.地基.设计地震[M].北京:地震出版社,1990.(ZHOU Xi-yuan,WANG GUANG-jun,SU Jing-yu.Site foundation design earthquake[M].Beijing:Earthquake Press,1990.(in Chinese))
[7]李存志,李向新,姚明波,等.昆明盆地剪切波速与地基特性相关分析研究[J].昆明冶金高等专科学校学报,2006,22(3):1–5.(LI Cun-zhi,LI Xiang-xin,YAO Ming-bo,et al.Correlation analyses between shear wave velocity and ground properties and Kunming Basin[J].Journal of Kuming Metallurgy College,2006,22(3):1–5.(in Chinese))
[8]蔺宝云,简文彬.福州盆地土层S波波速特征及分布规律[J].岩土工程界,2005,8(10):27–29.(LAN Bao-yun,JIAN Wen-bin.Shear velocity characteristics and distribution of soil in Fuzhou Basin[J].Journal of Geotechnical World,2005,8(10):27–29.(in Chinese))
[9]钟晓鸣,万小笠.Excel在统计分析中的应用[M].北京:科学出版社,2009.(ZHONG Xiao-ming,WANG Xiao-li.Application of EXCEL in statistical analysis[M].Beijing:Science Press,2009.(in Chinese))
[10]GB50191—93构筑物抗震设计规范[S].1993.(GB50191—93 Design code for antiseismic of special structures[S].1993.(in Chinese))
[11]GB17741—2005工程场地地震安全性评价[S].2005.(GB17741—2005 Scismic safety assessment of angineering site[S].2005.(in Chinese))
[12]GB50021—94.岩土工程勘察规范[S].1995.(GB50021—94 Code for investigation of geotechnical engineering[S].1995.(in Chinese))
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