摘要
理论上液化判别公式应具有区域性,但以往对此尚少研究,导致液化判别方法研究和应用上出现了矛盾与混乱。本文采用经典的Logistic回归理论,利用四个不同地区CPT液化数据得到各自地区的液化判别公式,解析了四个公式的差异性与互用可行性。研究表明:采用四个地区数据库构建的判别公式均具有可靠性,可以用于各自地区的液化判别;四个地区的判别公式,模型形式相同但参数大多存在较大差别;四个地区构成的6对数据库中,t检验下有3对表现为有极其显著差异,占50%,有2对表现为有很显著差异,占33%,仅有1对无显著差异;用一个地区公式预测其他地区的液化,预测结果易偏于保守或危险,且程度大多为严重或极其严重,需十分谨慎。本文首次利用实测数据明确证明了液化判别公式具有区域性的理论猜测,并给出了定量评价结果,对场地液化震害风险预测与防御技术的研究发展和工程应用具有重要意义。
The liquefaction discrimination formula should be regional theoretically.Little research on the problem in the past leads to contradictions and confusion in the discriminative method of liquefaction.Using the classical logistic regression theory and CPT liquefaction data,this paper obtains the different liquefaction discrimination formulas and analyzes the difference and the interoperability feasibility of the four formulas.The results show that the formulas constructed by the four regional databases are reliable in the four regions.Although the model forms of the four regions are the same,most of the parameters of the formulas are quite different.Through t-test,three of the six pairs of databases composed of four regions showed extremely significant difference,accounting for 50%,two pairs showed very significant difference,accounting for 33%,and only one pair had no significant difference.When one region formula is used to predict liquefaction in other regions,the prediction results tend to be conservative or dangerous,and the degree is mostly serious or extremely serious.This paper,for the first time,uses the measured data to clearly prove that the liquefaction discrimination formula has regional theoretical speculation,and gives the quantitative evaluation results,which is of great significance to the research development and engineering application of site liquefaction earthquake risk prediction and defense technology.
作者
邱香
袁晓铭
李鑫洋
汪云龙
李兆焱
张思宇
Qiu Xiang;Yuan Xiaoming;Li Xinyang;Wang Yunlong;Li Zhaoyan;Zhang Siyu(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2022年第S01期241-249,共9页
China Civil Engineering Journal
基金
黑龙江省自然科学重点基金(ZD2019E009)
关键词
液化判别公式
区域性
差异性
互用性
CPT
liquefaction discrimination formula
regional
differences
interoperability
CPT data
