南京河西地区岩土体剪切波速与土层深度的关系
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摘要
南京河西地区是南京市重点开发的新市区,该区域工程地质条件相似,主要为长江高河漫滩地质地貌单元。本文选取该地区47个典型钻孔的岩土体剪切波速资料,采用三种数学模型进行统计回归分析,运用相关系数R(或测定系数R2)检验Vs—H之间的线性相关关系,并根据计算的SD值选择较优的数学模型。统计结果表明,该地区各类岩土体的Vs—H线性相关关系显著,说明采用上述数学模型进行Vs—H回归是可行的。对两个工程场地进行剪切波速预测,并对场地类别作出划分,检验结果表明,该地区各类岩土体的Vs—H经验关系是可靠的,符合当地岩土特征,在样本深度范围内有足够的工程应用精度,可以应用。
Hexi district of Nanjing city is an important new developing area where the engineering geology is similar and its morphologic unit is a high flood plain of the Yangtze river.The data of shear wave speeds of bedrocks and soils at 47 typical boreholes in the district were selected for regressive statistic analyses with three mathematical models;the correlation coefficient R(or the measured coefficient R2) was used to verify the linear correlation between Vsand H;the calculated SD values were based to select the best mathematical model.The regressive statistic analyses show that VS and H of various bedrocks and soils in the district is remarkably correlated linearly,which indicates the regressive statistic analyses with the mathematical models are feasible.The forecast of the shear wave speeds and the classification of soils on two sites have shown that the empirical relation VS-H of various bedrocks and soils in the district is reliable,accords with the feature of local bedrocks and soils,and is applicable for engineering in the range of sampling depths with sufficient accuracy.
Hexi district of Nanjing city is an important new developing area where the engineering geology is similar and its morphologic unit is a high flood plain of the Yangtze river.The data of shear wave speeds of bedrocks and soils at 47 typical boreholes in the district were selected for regressive statistic analyses with three mathematical models;the correlation coefficient R(or the measured coefficient R2) was used to verify the linear correlation between Vsand H;the calculated SD values were based to select the best mathematical model.The regressive statistic analyses show that VS and H of various bedrocks and soils in the district is remarkably correlated linearly,which indicates the regressive statistic analyses with the mathematical models are feasible.The forecast of the shear wave speeds and the classification of soils on two sites have shown that the empirical relation VS-H of various bedrocks and soils in the district is reliable,accords with the feature of local bedrocks and soils,and is applicable for engineering in the range of sampling depths with sufficient accuracy.
引文
[1]GB 50011-2001,《建筑抗震设计规范》[S].
[2]GB 17741-2005,《工程场地地震安全性评价》[S].
[3]斯月英.南京市城西长江漫滩软土的工程地质特性探讨[J].地基处理,2001,12(2):37-44.Si Y Y.A discussion on engineering geologicalcharacteristics of Yangtze valley fault west of Nanjing[J].Ground Improvement,2001,12(2):37-44.
[4]张平,宋林辉,周峰.南京河西地区地质概况及基础的选型分析[J].建筑技术开发,2006,33(11):56-57.Zhang P,Song L H,Zhou F.Geology general situationand foundation form in Hexi district of Nanjing city[J].Building Technique Development,2006,33(11):56-57.
[5]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):33-37.Chen G X,Xu J L,Yuan C Q.Relation between depthand shear wave velocity of soil and bedrock in NanjingCity[J].Journal of Nanjing Architectural and CivilEngineering Institute,1998,(2):33-37.
[6]潘国营,许昭平,越元松.焦作市区岩土剪切波速和场地卓越周期研究[J].焦作工学院学报(自然科学版),2000,19(1):1-4.Pan G Y,Xu Z P,Yue Y S.Research on shear wavevelocity and predominant period of soils of Jiaozuourban district[J].Journal of Jiaozuo Institute ofTechnology(Nature Science),2000,19(1):1-4.
[7]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,(1-2):90-93.An W P,Lan Q L,He M H,et al.Depth distributionof shear wave velocity in Taiyuan area[J].Earthquake Research in Shanxi,1997,(1-2):90-93.
[2]GB 17741-2005,《工程场地地震安全性评价》[S].
[3]斯月英.南京市城西长江漫滩软土的工程地质特性探讨[J].地基处理,2001,12(2):37-44.Si Y Y.A discussion on engineering geologicalcharacteristics of Yangtze valley fault west of Nanjing[J].Ground Improvement,2001,12(2):37-44.
[4]张平,宋林辉,周峰.南京河西地区地质概况及基础的选型分析[J].建筑技术开发,2006,33(11):56-57.Zhang P,Song L H,Zhou F.Geology general situationand foundation form in Hexi district of Nanjing city[J].Building Technique Development,2006,33(11):56-57.
[5]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):33-37.Chen G X,Xu J L,Yuan C Q.Relation between depthand shear wave velocity of soil and bedrock in NanjingCity[J].Journal of Nanjing Architectural and CivilEngineering Institute,1998,(2):33-37.
[6]潘国营,许昭平,越元松.焦作市区岩土剪切波速和场地卓越周期研究[J].焦作工学院学报(自然科学版),2000,19(1):1-4.Pan G Y,Xu Z P,Yue Y S.Research on shear wavevelocity and predominant period of soils of Jiaozuourban district[J].Journal of Jiaozuo Institute ofTechnology(Nature Science),2000,19(1):1-4.
[7]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,(1-2):90-93.An W P,Lan Q L,He M H,et al.Depth distributionof shear wave velocity in Taiyuan area[J].Earthquake Research in Shanxi,1997,(1-2):90-93.
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