基于静力触探与剪切波速联合测试的砂土液化判别方法  

Liquefaction Discrimination of Sand Based on Cone Penetration Test Combined Shear Wave Velocity Test

作　　者：段伟 赵泽宁[2] 蔡国军 刘松玉[2] 董晓强 陈瑞锋[2] DUAN Wei;ZHAO Zening;CAI Guojun;LIU Songyu;DONG Xiaoqiang;CHEN Ruifeng(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Institute of Geotechnical Engineering,Southeast University,Nanjing 211189,China;School of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]东南大学岩土工程研究所,江苏南京211189 [3]安徽建筑大学土木工程学院,安徽合肥230601

出　　处：《同济大学学报（自然科学版）》2022年第5期703-710,共8页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(52108332,42072299,41877231);中国博士后科学基金(2021M702421)。

摘　　要：基于逻辑回归算法提出一种静力触探(CPT)与剪切波速(V_(s))联合测试方法(CPT-V_(s)联合方法),并结合唐山地震液化案例对CPT-V_(s)相关性方法、q_(c)/G_(0)方法和CPT-V_(s)联合方法进行了比较。结果表明:3种方法的场地液化判别准确率分别为89%、78%和100%,整体液化判别准确率分别为94%、50%、94%;CPT-V_(s)相关性方法适用范围受参数值限制,q_(c)/G_(0)方法过于保守,造成非液化区误判;CPT-V_(s)联合方法不受参数值限制,可给出较为满意的结果。A method of cone penetration test(CPT)combined shear wave velocity(V_(s))test(CPT-V_(s) combination method)was proposed based on logistic regression algorithm.In connection with the liquefaction cases of Tangshan earthquake,the comparison was done among CPT-V_(s)correlation method,q_(c)/G_(0)method and CPTV_(s)combination method.It is shown that the site liquefaction discrimination rates of CPT-V_(s)correlation method,q_(c)/G_(0)method and CPT-V_(s)combination method are 89%,78%and 100%,respectively,and the overall accuracies of liquefaction discrimination of the three methods are 94%,50%,and 94%,respectively;the application scope of CPT-V_(s)correlation method is limited by parameter values,and the q_(c)/G_(0)method is too conservative,resulting in a large discrimination error in the non-liquefied area;the method proposed is not affected by the limitation of parameter values,and can give satisfactory results.

关 键 词：砂土 液化 静力触探(CPT) 剪切波速 周期阻力比 

分 类 号：TU443[建筑科学—岩土工程]