一种建筑工程场地参数V_(S30)的外推模型修正方法  

Method for correcting extrapolation model of engineering site parameter V_(S30)

作　　者：王大任 任叶飞[1,2] 张雨婷 冀昆[1,2] 王宏伟[1,2] 温瑞智[1,2] WANG Daren;REN Yefei;ZHANG Yuting;JI Kun;WANG Hongwei;WEN Ruizhi(Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Lab of Earthquake Engineering and Engineering Vibration of China Earthquake Administration(Institute of Engineering Mechanics,China Earthquake Administration),Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所,哈尔滨150080 [2]中国地震局地震工程与工程振动重点实验室(中国地震局工程力学研究所),哈尔滨150080

出　　处：《哈尔滨工业大学学报》2023年第9期1-6,共6页Journal of Harbin Institute of Technology

基　　金：国家重点研发计划(2019YFE0115700);国家自然科学基金(51878632);黑龙江省自然科学基金优秀青年项目(YQ2019E036)。

摘　　要：为提高覆盖土层较浅工程场地上钻孔的外推V_(S30)值精度,选取日本KiK-net台站中符合一定条件的钻孔数据,利用相关系数矩阵排除共线性问题以确定可用于回归的3个体现钻孔剖面特性的参数,通过最优子集法建立常数外推V_(S30)残差与这3个参数的优选函数关系,利用调整后R^(2)、贝叶斯信息准则和k倍交叉验证3种特征选择方法确定其中的最优关系。根据修正后预测V_(S30)与实际观测V_(S30)间残差均值和标准差的分布给出推荐的常数外推模型修正函数。结果表明,该V_(S30)的外推模型能够较好提高底部常速度模型的预测精度,并且在新疆地区具有一定适用性。提出的方法可以对中国不同地区的场地V_(S30)经验估计模型建立提供参考。To improve the accuracy of the extrapolated V_(S30)values of boreholes on engineering sites with shallow overburden,this paper selects certain borehole data from KiK-net database for research.The correlation coefficient matrix was adopted to test the collinearity of parameters,and three parameters that can reflect the characteristics of borehole profiles were determined.Through the optimized subset method,the relationship functions between the residuals of V_(S30)estimated by bottom constant velocity(BCV)model and the three selected parameters were established.On the basis of three feature selecting methods including adjusted R?,Bayesian information criterion,and k-fold cross-validation,the optimal function was proposed.According to the distribution of mean and standard deviation of residuals between predicted and observed V_(S30)values,a correction function of BCV model was proposed.Results show that the extrapolation model of V_(S30)could improve the prediction accuracy of BCV model,and it was applicable in Xinjiang region.The method proposed in this paper can provide reference for developing empirical models for estimating V_(S30)in other regions of China.

关 键 词：场地参数V_(S30) 常数外推模型 修正方法 最优子集法 特征选择 

分 类 号：P315.9[天文地球—地震学]