苏州城区深软场地土剪切波速与土层深度的经验关系
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摘要
苏州地处长江下游冲湖积平原,第4系沉积土层发育,土层深厚、松软,远震、大震的长周期地震动对苏州城区的重大工程有可能造成严重震害。结合海侵地质成因,分析了苏州城区深软场地52个钻孔剖面的剪切波速资料,发现剪切波速与土层深度的关系:40m以上浅土层基本符合线性函数分布,40m以下深土层基本符合幂函数分布;依据考虑和不考虑土体分类2种情况,给出了采用线性函数、幂函数分段形式拟合的苏州城区深软场地剪切波速随土层深度变化的经验关系,为苏州城区深软场地重大工程建设的场地地震效应评价提供了有益的基础性资料。
Urban area of Suzhou city locates on the alluvial or lacustrine plain in the lower reaches of Yangtze River,which is covered by Quaternary sedimentary soil layer.Because of the thick and soft layer,long-period ground motion of far earthquake or great earthquake may cause serious damage to some important engineering projects in this area.Based on analyzing shear wave velocity data of 52 drilling hole profiles,combining geological genesis of transgression,the relationship between shear wave velocity and soil depth of deep soft sites can be found that the distribution of them accords with linear function above the soil depth of 40 meters,and accords with power function under deeper than the soil depth of 40 meters.According to two cases with and without considering soil classification,both empirical relationships fitting with piecewise linear function and power function between the shear wave velocity and the soil depth of deep soft sites in urban area of Suzhou city are obtained.This beneficial basic information can be provided to seismic effect evaluation of important engineering projects on deep soft sites in urban area of Suzhou city.
Urban area of Suzhou city locates on the alluvial or lacustrine plain in the lower reaches of Yangtze River,which is covered by Quaternary sedimentary soil layer.Because of the thick and soft layer,long-period ground motion of far earthquake or great earthquake may cause serious damage to some important engineering projects in this area.Based on analyzing shear wave velocity data of 52 drilling hole profiles,combining geological genesis of transgression,the relationship between shear wave velocity and soil depth of deep soft sites can be found that the distribution of them accords with linear function above the soil depth of 40 meters,and accords with power function under deeper than the soil depth of 40 meters.According to two cases with and without considering soil classification,both empirical relationships fitting with piecewise linear function and power function between the shear wave velocity and the soil depth of deep soft sites in urban area of Suzhou city are obtained.This beneficial basic information can be provided to seismic effect evaluation of important engineering projects on deep soft sites in urban area of Suzhou city.
引文
[1]姜洪涛,王富葆,杨达源.苏州市晚第四纪古地理与工程地质条件研究[J].地理科学,2003,23(1):82-86.
[2]Marshall Lew.Correlations of seismic velocity with depth[C]//International Conference on Recent Advances in Geotechnical Earthquake Engi-neering and Soil Dynamics(ICRA GEESD)U.S.A.1981
[3]曾勇.土层的性质与剪切波速的关系[J].西北地震学报,1986,8(3):71-78.
[4]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.
[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.
[6]安卫平,兰青龙,贺明华,等.太原地区剪切波速的深度分布[J].山西地震,1997,(1):87-94.
[7]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.
[8]蔺保云,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.
[9]徐国栋,马东辉,吴共湖,等.泉州市规划区场地抗震性能与土地适宜性分区研究[J].世界地震工程,2007,23(4):153-162.
[10]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.
[11]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,(2):32-37.
[2]Marshall Lew.Correlations of seismic velocity with depth[C]//International Conference on Recent Advances in Geotechnical Earthquake Engi-neering and Soil Dynamics(ICRA GEESD)U.S.A.1981
[3]曾勇.土层的性质与剪切波速的关系[J].西北地震学报,1986,8(3):71-78.
[4]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.
[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.
[6]安卫平,兰青龙,贺明华,等.太原地区剪切波速的深度分布[J].山西地震,1997,(1):87-94.
[7]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.
[8]蔺保云,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.
[9]徐国栋,马东辉,吴共湖,等.泉州市规划区场地抗震性能与土地适宜性分区研究[J].世界地震工程,2007,23(4):153-162.
[10]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.
[11]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,(2):32-37.
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