Article(id=1276897298529514391, tenantId=1146029695717560320, journalId=1276577071032668183, issueId=1276897056350405403, articleNumber=null, orderNo=null, doi=10.13244/j.cnki.jiwhr.20250257, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1761580800000, receivedDateStr=2025-10-28, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1782365639573, onlineDateStr=2026-06-25, pubDate=1779897600000, pubDateStr=2026-05-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1782365639573, onlineIssueDateStr=2026-06-25, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1782365639573, creator=13701087609, updateTime=1782365639573, updator=13701087609, issue=Issue{id=1276897056350405403, tenantId=1146029695717560320, journalId=1276577071032668183, year='2026', volume='24', issue='3', pageStart='261', pageEnd='428', issueExtLink='null', onlineDate='null', pubDate='1779897600000', pubDateStr='2026-05-28', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1782365581834, creator='13701087609', updateTime=1782367082282, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1276903349781926250, tenantId=1146029695717560320, journalId=1276577071032668183, issueId=1276897056350405403, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1276903349781926251, tenantId=1146029695717560320, journalId=1276577071032668183, issueId=1276897056350405403, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=271, endPage=284, ext={EN=ArticleExt(id=1276897298730840985, articleId=1276897298529514391, tenantId=1146029695717560320, journalId=1276577071032668183, language=EN, title=Study on the probabilistic assessment model of sand liquefaction based on logistic regression algorithm, columnId=null, journalTitle=Journal of China Institute of Water Resources and Hydropower Research, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Sand liquefaction caused by strong earthquakes is receiving increasing attention due to the frequency of extreme seismic events. The liquefaction possibility assessment is the primary task in the study of sand liquefaction. In this paper,a probability assessment model is established based on the field investigation of liquefaction cases,combined with the knowledge of probability statistics and logistic regression algorithm. The effectiveness of the model is verified by comparing with the existing deterministic liquefaction assessment methods. Furthermore,the parameters analysis affecting the liquefaction assessment results is also conducted. The results show that the liquefaction discrimination model established in this paper has a success rate of 85.70% and 82.50% for rejudging the liquefaction and non-liquefaction cases; and a success rate of 88.00% and 72.00% for the discrimination of the validation set, demonstrating a good discrimination success rate. The fine particle content, overburden stress correction factor,the correction coefficient for overburden stress,and the adjustment coefficient for seismic magnitude should be applied to correct case data when applying this model to assess liquefaction potential,which can improve the accuracy of sand liquefaction assessment.At the same time, the model can provide specific discrimination formulas. In the future, when new samples are incorporated, the model can be further improved by adjusting and modifying based on various parameters.

, authors=null, authorsList=Jian LI, Jingjun LI, Meng FAN, Kaibin ZHU, Zhengquan YANG, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1276897302916756407, articleId=1276897298529514391, tenantId=1146029695717560320, journalId=1276577071032668183, language=CN, title=基于逻辑回归算法的砂土液化判别概率模型分析与应用, columnId=0, journalTitle=中国水利水电科学研究院学报(中英文), columnName=, runingTitle=null, highlight=null, articleAbstract=

极端地震事件频发,强震作用导致的砂土液化问题越来越得到重视。液化可能性判别是研究砂土液化问题的重要工作之一。本文结合统计的现场液化调查案例,基于逻辑回归算法建立了一种砂土液化判别概率模型,通过与确定性液化判别方法进行对比,验证了模型的有效性,并探究了部分参数对液化判别结果的影响。结果表明:本文建立的砂土液化判别概率模型对液化、非液化案例的回判成功率分别为85.70%,82.50%;对验证集的判别成功率达88.00%、72.00%,具有良好的判别成功率,在应用本文模型进行砂土液化可能性判别时,通过细粒含量修正系数、上覆应力修正系数、上覆有效应力校正系数、震级影响系数等对现场液化调查案例数据进行修正,可增加砂土液化可能性判别的准确性。同时模型可给出具体的判别公式,未来纳入新样本后还可结合各参数修正对模型进行改进。

, authors=

李建(1981—),硕士,正高级工程师,主要从事土石坝筑坝料工程特性研究。E-mail:

, authorsList=李建, 李敬军, 范猛, 朱凯斌, 杨正权, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=
杨正权(1980—),博士,正高级工程师,博士生导师,主要从事土动力学与土工结构抗震研究。E-mail:
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李建(1981—),硕士,正高级工程师,主要从事土石坝筑坝料工程特性研究。E-mail:

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李建(1981—),硕士,正高级工程师,主要从事土石坝筑坝料工程特性研究。E-mail:

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Logistic regression models at different probability levels

, figureFileSmall=null, figureFileBig=null, tableContent=
概率水平PLX模型方程模型指数形式
0.114.85-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-3.73)
0.214.04-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-3.53)
0.512.65-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-3.18)
0.811.26-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-2.83)
0.910.45-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-2.63)
), ArticleFig(id=1276897318490206215, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=CN, label=表1, caption=

不同概率水平下的逻辑回归模型

, figureFileSmall=null, figureFileBig=null, tableContent=
概率水平PLX模型方程模型指数形式
0.114.85-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-3.73)
0.214.04-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-3.53)
0.512.65-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-3.18)
0.811.26-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-2.83)
0.910.45-0.34N1,60CS+3.98ln(CSR7.5)=0CSR7.5=e(0.085N1,60CS-2.63)
), ArticleFig(id=1276897318557315080, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=EN, label=Table 2, caption=

The prediction accuracy of logistic regression models at different probability levels

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概率水平PLX液化判别成功率/%非液化判别成功率/%
0.1100.0032.50
0.2100.0052.50
0.585.7082.50
0.863.2092.50
0.959.20100.00
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不同概率水平下逻辑回归模型液化、非液化判别成功率

, figureFileSmall=null, figureFileBig=null, tableContent=
概率水平PLX液化判别成功率/%非液化判别成功率/%
0.1100.0032.50
0.2100.0052.50
0.585.7082.50
0.863.2092.50
0.959.20100.00
), ArticleFig(id=1276897318704115722, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=EN, label=Table 3, caption=

The accuracy of the proposed model,NCEER and Idriss method at PLX)=0.5

, figureFileSmall=null, figureFileBig=null, tableContent=
判别成功率/%
本文模型NCEER方法Idriss方法
液化点非液化点液化点非液化点液化点非液化点
85.7082.5087.8080.0087.8085.00
), ArticleFig(id=1276897318783807499, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=CN, label=表3, caption=

PLX)=0.5概率水平下的本文模型与NCEER方法、Idriss方法的液化判别成功率

, figureFileSmall=null, figureFileBig=null, tableContent=
判别成功率/%
本文模型NCEER方法Idriss方法
液化点非液化点液化点非液化点液化点非液化点
85.7082.5087.8080.0087.8085.00
), ArticleFig(id=1276897318850916364, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=EN, label=Table 4, caption=

Liquefaction discrimination results comparison of the proposed model with the NCEER method and the Idriss method on validation set

, figureFileSmall=null, figureFileBig=null, tableContent=
判别成功率/%
本文模型NCEER方法Idriss方法
液化点非液化点液化点非液化点液化点非液化点
88.0072.0080.9568.0085.7168.00
), ArticleFig(id=1276897318926413837, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=CN, label=表4, caption=

本文模型与NCEER方法、Idriss方法在验证集上的液化判别结果的对比

, figureFileSmall=null, figureFileBig=null, tableContent=
判别成功率/%
本文模型NCEER方法Idriss方法
液化点非液化点液化点非液化点液化点非液化点
88.0072.0080.9568.0085.7168.00
), ArticleFig(id=1276897319048048654, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=EN, label=Table 5, caption=

Prediction results comparison on the validation set between the proposed model and existing probability model

, figureFileSmall=null, figureFileBig=null, tableContent=
案例实际观测结果本文模型神经网络模型Cetin模型
概率/%预测结果概率/%预测结果概率/%预测结果
179.1580.2070.37
274.2290.3576.36
391.2585.2585.28
499.08100.0099.99
530.5925.1328.36
696.3097.2895.00
796.5798.2598.00
879.4274.0375.03
997.2280.2579.26
1092.6599.2870.28
6113.495.693.96
629.384.3712.56
637.7310.2810.56
640.000.004.73
6578.7090.2585.25
660.160.000.00
6741.9440.2840.16
), ArticleFig(id=1276897319127740431, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=CN, label=表5, caption=

本文模型与现有概率模型对验证集预测结果的对比

, figureFileSmall=null, figureFileBig=null, tableContent=
案例实际观测结果本文模型神经网络模型Cetin模型
概率/%预测结果概率/%预测结果概率/%预测结果
179.1580.2070.37
274.2290.3576.36
391.2585.2585.28
499.08100.0099.99
530.5925.1328.36
696.3097.2895.00
796.5798.2598.00
879.4274.0375.03
997.2280.2579.26
1092.6599.2870.28
6113.495.693.96
629.384.3712.56
637.7310.2810.56
640.000.004.73
6578.7090.2585.25
660.160.000.00
6741.9440.2840.16
), ArticleFig(id=1276897319224209424, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=EN, label=Table 6, caption=

Comparison of probability model under different FC for PLX)=0.5

, figureFileSmall=null, figureFileBig=null, tableContent=
判别成功率/%
Model-1Model-2
CSR7.5=e(0.085N1,60CS-3.18)CSR7.5=e(0.085N1,60CS-3.28)
液化点非液化点液化点非液化点
85.7082.5087.8070.00
), ArticleFig(id=1276897319312289809, tenantId=1146029695717560320, journalId=1276577071032668183, articleId=1276897298529514391, language=CN, label=表6, caption=

PLX)=0.5时不同FC概率模型对比

, figureFileSmall=null, figureFileBig=null, tableContent=
判别成功率/%
Model-1Model-2
CSR7.5=e(0.085N1,60CS-3.18)CSR7.5=e(0.085N1,60CS-3.28)
液化点非液化点液化点非液化点
85.7082.5087.8070.00
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基于逻辑回归算法的砂土液化判别概率模型分析与应用
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李建 1 , 李敬军 2, 3 , 范猛 2, 3 , 朱凯斌 2, 3 , 杨正权 2, 3
中国水利水电科学研究院学报(中英文) | 2026,24(3): 271-284
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中国水利水电科学研究院学报(中英文) | 2026 , 24 (3) : 271 -284
基于逻辑回归算法的砂土液化判别概率模型分析与应用
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李建1 , 李敬军2, 3, 范猛2, 3, 朱凯斌2, 3, 杨正权2, 3
作者信息
  • 1中国电建集团成都勘测设计研究院有限公司,四川 成都 610072
  • 2中国水利水电科学研究院 流域水循环与 水安全全国重点实验室,北京 100038
  • 3水利部水工程抗震与应急支持工程技术研究中心,北京 100048
通讯作者:
杨正权(1980—),博士,正高级工程师,博士生导师,主要从事土动力学与土工结构抗震研究。E-mail:
Study on the probabilistic assessment model of sand liquefaction based on logistic regression algorithm
Jian LI1 , Jingjun LI2, 3, Meng FAN2, 3, Kaibin ZHU2, 3, Zhengquan YANG2, 3
Affiliations
  • 1Power China Chengdu Engineering Corporation Limited,Chengdu610072,China
  • 2China Institute of Water Resources and Hydropower Research,State Key Laboratory of Water Cycle and Water Security,Beijing100038,China
  • 3Engineering Research Center on Anti-Earthquake and Emergency Support Techniques of Hydraulic Projects,Ministry of Water Resources,Beijing100048,China
出版时间: 2026-05-28 doi: 10.13244/j.cnki.jiwhr.20250257
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极端地震事件频发,强震作用导致的砂土液化问题越来越得到重视。液化可能性判别是研究砂土液化问题的重要工作之一。本文结合统计的现场液化调查案例,基于逻辑回归算法建立了一种砂土液化判别概率模型,通过与确定性液化判别方法进行对比,验证了模型的有效性,并探究了部分参数对液化判别结果的影响。结果表明:本文建立的砂土液化判别概率模型对液化、非液化案例的回判成功率分别为85.70%,82.50%;对验证集的判别成功率达88.00%、72.00%,具有良好的判别成功率,在应用本文模型进行砂土液化可能性判别时,通过细粒含量修正系数、上覆应力修正系数、上覆有效应力校正系数、震级影响系数等对现场液化调查案例数据进行修正,可增加砂土液化可能性判别的准确性。同时模型可给出具体的判别公式,未来纳入新样本后还可结合各参数修正对模型进行改进。

地震  /  砂土液化  /  逻辑回归算法  /  液化判别  /  概率模型

Sand liquefaction caused by strong earthquakes is receiving increasing attention due to the frequency of extreme seismic events. The liquefaction possibility assessment is the primary task in the study of sand liquefaction. In this paper,a probability assessment model is established based on the field investigation of liquefaction cases,combined with the knowledge of probability statistics and logistic regression algorithm. The effectiveness of the model is verified by comparing with the existing deterministic liquefaction assessment methods. Furthermore,the parameters analysis affecting the liquefaction assessment results is also conducted. The results show that the liquefaction discrimination model established in this paper has a success rate of 85.70% and 82.50% for rejudging the liquefaction and non-liquefaction cases; and a success rate of 88.00% and 72.00% for the discrimination of the validation set, demonstrating a good discrimination success rate. The fine particle content, overburden stress correction factor,the correction coefficient for overburden stress,and the adjustment coefficient for seismic magnitude should be applied to correct case data when applying this model to assess liquefaction potential,which can improve the accuracy of sand liquefaction assessment.At the same time, the model can provide specific discrimination formulas. In the future, when new samples are incorporated, the model can be further improved by adjusting and modifying based on various parameters.

earthquake  /  sand liquefaction  /  logistic regression algorithm  /  liquefaction assessment  /  probability model
李建, 李敬军, 范猛, 朱凯斌, 杨正权. 基于逻辑回归算法的砂土液化判别概率模型分析与应用. 中国水利水电科学研究院学报(中英文), 2026 , 24 (3) : 271 -284 . DOI: 10.13244/j.cnki.jiwhr.20250257
Jian LI, Jingjun LI, Meng FAN, Kaibin ZHU, Zhengquan YANG. Study on the probabilistic assessment model of sand liquefaction based on logistic regression algorithm[J]. Journal of China Institute of Water Resources and Hydropower Research, 2026 , 24 (3) : 271 -284 . DOI: 10.13244/j.cnki.jiwhr.20250257
砂土液化是指饱和松散砂土在强烈地震等动力荷载作用下孔压增大,有效应力减小,最终抗剪强度丧失,表现为类似液体状态的过程1-2。近年来,世界各地大地震发生频数增大,强震作用时,地基中砂层液化的可能性增大,上部结构安全性降低,砂土液化研究被国内外学者广泛关注3-4
砂土液化研究主要集中在三个方面:砂土液化的可能性判别、液化砂土的变形预测和液化破坏的防治措施5。砂土是否会发生液化是研究液化问题的基础。为此,国内外研究学者基于原位试验、物理试验、数值分析以及微观分析的计算力学等手段,建立了多种液化判别方法5-9
随着现场液化调查案例数据的不断积累,工程上常用的标准贯入试验(Standard Penetration Test,SPT)积累了大量的试验数据,成为目前最为常用的判别方法6。以SPT为基础的砂土液化判别方法包括确定性方法和概率性方法7。确定性液化判别方法的研究已较为成熟,国内形成了以临界标贯击数(Ncr)为基础的规范法判别方法10-11;国外形成了以液化势为核心的判别方法12-14。目前工程场地地震安全性评价工作的国家标准中,设防目标以概率水准给出,场地输入地震动也具有概率意义,而液化判别方法仅给出确定性结果,二者不相匹配,且无法满足工程抗震分析的需求,需提供具有概率意义的液化评价方法,才能与基于性能的水利工程设计相匹配13
国内外对概率性分析评价最早始于1980年代,Liao等15基于SPT数据,通过多元回归方法建立了液化判别概率模型。随后Cetin等712、Boulanger等13、Atangana等16分别从不同的概率理论角度提出了基于SPT数据的概率性液化判别与评价方法,并给出了概率形式的液化判别公式,形成了系统性的研究成果。国内石兆吉等17对我国砂土液化震害资料和部分国外资料进行统计分析,提出了多因素、非线性的概率液化势判别公式。近年来,机器学习、大数据与各学科领域不断交叉,在砂土液化概率判别中的应用日益增多18-20。袁近远等18、陈国兴等19、李萍萍等20分别提出了基于单变量算法、神经网络模型、逻辑回归模型的砂土液化判别方法,较传统的概率判别方法在判别精度上有不同程度的提升,这些方法在建立时仅选用了不同的计算模型理论,考虑了不同个数的影响因素21-23,但影响土体液化判别方法准确性的原因十分复杂,受到多个修正参数或者因素的影响,上述方法或者模型在建立的过程中,未系统考虑影响砂土液化的若干因素或者参数的变化对计算结果的影响24-28。Cetin712、Bhattacharya29等将贝叶斯分析、极限状态函数、最大似然理论等应用到概率判别方法中,促进了液化判别概率模型的发展,但部分方法仅给出了不同概率水平下的液化判别曲线,未对不同概率水平下的计算结果在工程中的应用进行进一步的分析30-34
本文基于逻辑回归算法,结合现场SPT震害资料6,建立了砂土液化判别概率模型,并且结合赤池信息准则(Akaike Information Criterion,AIC)和贝叶斯信息准则(Bayesian Information Criterion,BIC),验证了模型的可靠性。通过与现有液化判别方法进行比较,探究了是否进行细粒含量修正系数、上覆应力修正系数、上覆有效应力校正系数、震级影响系数修正对概率模型判别成功率的影响,并通过实际案例分析计算,验证了本文提出的概率模型的有效性。
在模型建立过程中,逻辑函数(Sigmoid)是其核心思想,其函数形式如式(1):
σZ=11+ez
式中:Z为自变量;σZ)为概率函数。
本文将液化概率函数用PLX)表示,则0≤PLx)≤1;X=[x1x2,…,xn]为自变量数组,在本文中为液化影响因素;由回归分析确定相关系数β=[β0β1β2,…,βn],β0β1β2为回归系数。故PLX)为:
PL(X)=11+exp[-(β0+β1x1++βnxn)]
为后续计算方便,将式(2)转化成函数式(3),其形式如下:
QL(X)=ln[PL(X)1-PL(X)]=β0+β1x1++βnxn
逻辑回归系数β的计算结果直接决定模型对数据的拟合效果,本文采用最大似然原则和对数似然函数进行逻辑回归系数的计算:
L(β,X,y)=i=1n[yiln(σ(X(i)β))+(1-yiln(1-σ(X(i)β))]
式中:σXiβ)为模型预测的概率;yi为目标变量,即实际的液化分类结果,由于液化是一个二分类问题,取:液化时yi=1;非液化时yi=0。
对于本文来说,其似然函数和对数形式相应为:
L(β,X,y)=i=1n[PL(X)]yi[1-PL(X)](1-yi)
ln[L(β,X,y)]=-j=1mln1+exp[-(β0+i=1nβi(xi)j)]-j=1n-m[β0+i=1nβi(xi)j)]
式中:n为样本数量;m为液化数据个数;n-m为非液化数据个数。理论上,β的最优解存在于概率函数的极值点处。本文采用梯度优化算法(Broyden-Fletcher-Goldfarb-Shanno,BFGS)进行逻辑回归系数的求解,采用AICBIC分析回归系数的计算效果30-31
AICBIC计算公式分别为:
AIC=2k-2L(β,X,y)
BIC=klnn-2L(β,X,y)
式中:k为模型参数个数;n为样本数量;Lβ,X,y)为似然函数。
基于逻辑回归算法建立的模型要求变量相互独立,参考国内外确定性液化判别方法和概率性液化判别方法对液化影响因素的分析12,液化指标分为两类:与地震荷载下土体的动剪应力(Cyclic Stress Ratio,CSR);土体的抗液化强度(Liquefaction Resistance,CRR)。其中,CRR与修正后的标准贯入锤击数(N1,60CS)有关,CSRN1,60CS彼此相互独立。通常在进行液化判别时,需对计算的CSR进行参数修正,将其调整到标准条件(震级为7.5级、上覆有效应力为1个大气压)下,即最终得到CSR7.56。以简化Seed法为例,CRRN1,60CS呈指数关系,同理CSR亦应与N1,60CS呈指数关系。指数关系在模型计算时较复杂,为提高模型计算效率,首先对CSR7.5取对数,采用ln(CSR7.5)和N1,60CS作为自变量,建立两因素的回归模型,CSR7.5N1,60CS按照Seed等人的计算公式进行5。将自变量代入式(3)可得:
ln(PL(X)1-PL(X))=β+0β1N1,60CS+β2lnCSR7.5
式中:CSR7.5CSR修正到标准条件(震级为7.5级、上覆有效应力为1个大气压)下的值;N1,60CS为经参数修正后的标准贯入锤击数,其中,实测标贯击数为N,经上覆有效应力归一系数、锤击能量修正系数、钻孔直径修正系数、钻杆长度修正系数、护壁校正系数和标贯试验测试系统的校正系数修正后即可得到N1,60N1,60经细粒含量修正后即可得到N1,60CS
本文选用Seed等6整理的现场液化案例SPT数据作为模型训练集,数据来自1944—1981年间的13次地震,震级范围为5.6~8.0级,包括日本福井、新潟,中国海城、唐山以及美国部分地区等,基本覆盖了全球地震高发地区。基础数据共计87组,参考Seed等的数据异常值处理方法,逐一对样本数据进行异常值处理,处理后的液化样本47组,非液化样本40组。按式(5)(6)进行逻辑回归分析,用式(7)(8)验证逻辑回归参数的可靠性。ln(CSR7.5)和CSR7.5坐标系下样本数据分布如图12所示。
通常认为当PLX)=0.5时,概率方法的判别效果与确定性方法相当7。以概率水平PLX)=0.5为例,逻辑回归分析中模型参数的计算结果为:β0=12.65,β1=-0.34,β2=3.98。AIC计算结果为71.42,BIC的计算结果为78.88。其中,AICBIC在合适范围内值越小,代表模型参数的计算结果越好28,本文模型的计算值满足要求。模型如式(10)所示:
ln(PL(X)1-PL(X))=12.65-0.34N1,60CS+3.98lnCSR7.5
本文假设5个概率水平,即PLX)= 0.1、0.2、0.5、0.8、0.9,不同概率水平下的模型方程及指数形式如表1所示。
图34给出了不同概率水平下样本数据点与ln(CSR7.5)-N1,60CSCSR7.5-N1,60CS的关系。表2给出了不同概率水平下模型对液化、非液化点的判别成功率。随着概率水平的增加,逻辑回归曲线逐渐向左偏移。PLX)=0.1、0.2时,液化数据点全部位于概率水平曲线以上,模型对液化点判别的成功率均为100.00%;同时,有较多的非液化数据点也位于概率水平曲线上方,模型判别这些点会发生液化,非液化点整体判别成功率分别为32.50%、52.50%,成功率较低,从工程安全角度出发,预测结果偏于保守。PLX)=0.5时,少量液化点和非液化点交替位于曲线上下方,模型对液化点和非液化点的判别成功率分别为85.70%、82.50%,均在较高的可靠度水平,工程既能有一定的安全裕度,又可以节省一定成本,符合工程的设计。PLX)=0.8、0.9时,大部分非液化点位于概率水平曲线下方,模型对非液化点的判别成功率分别为92.50%、100.00%;同时有较多的液化数据点位于概率水平曲线下方,模型判别这些点不会发生液化,液化点整体判别成功率分别为63.20%、59.20%,预测结果偏于危险,工程安全风险较大。
图5给出了不同概率水平下基于逻辑回归算法提出的模型与NCEER7(National Center for Earthquake Engineering Research)方法、Idriss方法3(由Idriss等提出)液化临界曲线的对比结果。NCEER方法和Idriss方法的计算公式及过程分别参考文献[6]、[3]。PLX)=0.5时,模型与NCEER方法、Idriss方法液化临界曲线相近,三条曲线重叠交叉,验证了本文提出的基于逻辑回归算法的砂土液化判别概率模型的有效性。
图6分别给出了PLX)=0.5概率水平下的本文所提模型、NCEER方法、Idriss方法的判别结果,PLX)=0.5概率水平下的模型与NCEER方法和Idriss方法的液化临界曲线有两处交叉点。模型液化临界曲线在小于左侧交叉点时,位于NCEER方法和Idriss方法两者的下方;介于两交叉点之间时,位于两者上方;大于右侧交叉点时,位于两者下方。左侧交叉点处,现场液化调查案例数据点密集,控制了曲线的集中位置;右侧交叉点处,现场液化调查案例数据点稀少,控制着曲线的走势。液化判别成功率如表3所示,模型对液化点和非液化点的判别成功率分别为85.70%和82.50%,NCEER方法对液化点和非液化点的判别成功率分别为87.80%和80.00%,Idriss方法对液化点和非液化点的判别成功率分别为87.80%和85.00%。本文基于逻辑回归算法建立的砂土液化判别概率模型与NCEER方法、Idirss方法对液化点和非液化点的判别成功率相当,判别成功率差值在3%以内。土体是否发生液化是概率问题,NCEER方法、Idriss方法属于确定性方法,只能回答土体“是”或“否”发生液化,无法满足目前的工程抗震分析需求;本文模型可以赋予液化以概率意义,并根据不同场景可以设定不同的概率阈值,平衡液化和非液化误判的风险,为决策者提供更灵活的风险分析工具,满足当前的工程场地安全性评价需求。同时,随着收集的数据集不断丰富,本文建立模型的思路不但可以引入更多影响液化的变量,也方便基于更新后的数据集对模型进行优化,达到更准确的判别效果,因此本文模型的扩展性优于包括NCEER方法、Idriss方法在内的确定性液化判别方法。推荐本文提出的PLX)=0.5概率水平下的模型进行土体地震液化概率判别,记为Model-1。
通过模型训练得到不同概率水平下的模型曲线后,分析可知PLX)=0.5时,模型对两类案例的分类性能较好。本节将新收集到独立于训练集之外的SPT数据作为验证集对模型的有效性进行验证,以验证模型对新案例的分类效果。数据来源主要为Cetin等7的统计结果,包含1964—1995年间的9次地震的67组案例样本,震级范围为6.2~7.9级,涵盖了日本阪神以及日本海中部等地震高发地区。利用推荐的模型Model-1进行液化判别。
图7给出了模型对于液化点和非液化点的判别成功率。Model-1对液化点、非液化点的判别成功率分别为88.00%、72.00%,均维持在较高水平,说明模型对真实世界有一定的预测能力,可有效用于土体地震液化判别。特别是CSR7.5偏大同时N1,60CS偏小的液化案例以及CSR7.5偏小同时N1,60CS偏大的非液化案例,数据点分布较集中,模型对其具有较高的判别成功率。
未判别成功的液化点位于模型曲线的右侧,该区域为模型预测“非液化”的区域。液化点的特征与非液化点数据特征相似,且呈现一定的交叉重叠,某些液化点和非液化点之间的差异不足以被模型显著区分。这表明,液化的发生并不仅仅取决于N1,60CSCSR7.5两个影响因素,模型未能捕捉到数据中蕴含的复杂关系,需要更复杂的高维模型来正确分类这些点,但需注意避免过拟合现象的发生。未判别成功的非液化点位于模型曲线的左侧,该区域为模型预测“液化”的区域。未成功判别的非液化点分为两类:一类是数据分布较集中区域;一类是模型曲线左侧N1,60CSCSR7.5均较大点。对于数据点较集中的区域判别失败的原因和未判别成功的液化点相同。对于N1,60CSCSR7.5均较大的未成功判别的非液化点,是因为数据集中此类点的数量较少,模型未能充分处理这种高值特征的影响,从而将其预测为液化点,需要进一步探索土体液化与更多影响因素之间的复杂关系。
表4给出了本文推荐的模型Model-1与确定性NCEER方法、Idriss方法在验证集上预测结果的对比结果,验证集中部分案例的CSR略小,根据LI等25的研究,现有NCEER方法、Idriss方法液化判别曲线当N1,60CS到达一定阈值后,会出现不合理的回弯现象,不合理的回弯现象导致二者的液化曲线向液化区偏移,从而将部分液化案例和非液化案例误判。本文基于逻辑回归算法提出的砂土液化判别概率模型不存在回弯现象,对验证集中两类案例的预测准确率高于NCEER方法、Idriss方法,且判别不均衡性略有减小,体现了本文方法的优越性。
文章选用目前国外广泛应用的概率判别Cetin模型以及新兴的神经网络机器学习模型作为对比方法,与本文提出的模型Model-1进行预测结果对比,两种方法的计算过程及方法参考范猛等58的研究,计算结果如表5所示。各方法在特定的概率阈值判别标准下不仅可以给出预测结果,同时可附带给出具体样本的液化概率,这可在未来与现有的基于性能的地震危险性分析相匹配。模型对液化点、非液化点的判别成功率分别为88.00%、72.00%,具有良好的判别成功率。神经网络模型和Cetin模型对液化案例的判别成功率分别为90.28%、86.74%;对非液化案例的判别成功率分别为80.00%、74.00%。本文模型计算结果与广泛应用的Cetin概率模型相当,略差于神经网络模型,但神经网络模型本质上是黑箱模型,而本文方法可形成具体的计算公式,可为后续参数分析提供基础,故本文模型具有良好的应用前景。
本文采用提出的概率模型Model-1,分别对细粒含量修正系数、上覆有效应力归一系数、上覆有效应力校正系数、震级影响系数修正前后的数据集,进行液化判别成功率的比较分析,探讨是否进行液化参数修正对模型液化判别成功率的影响。在讨论某一参数的影响时,为了控制变量,数据集已经通过参数进行了修正。
细粒含量对土体骨架排列方式和塑性均有影响,从而影响土体的抗液化能力2。为探究细粒含量(FC)的修正对概率模型Model-1判别成功率的影响,本文判别了FC修正前后两种工况,Model-1采用Seed等6提出的细粒含量修正系数公式对FC进行修正,计算公式如式(11)(12)。其中,Cfines为Seed公式中的调整参数。
Cfines=1FC5%(1+0.004FC)+0.05(FCN1,60)5%<FC<35%1.14+1.75N1,60FC35%
N1,60CS=CfinesN1,60
图8给出了未通过FC修正前对数据点的判别结果,其中较多的非液化点被判定为发生液化,Model-1对液化点、非液化点的判别成功率分别为89.40%、75.00%,而通过FC修正后,液化点、非液化点的判别成功率分别为85.70%、82.50%(如表3所示)。修正后非液化点的判别成功率上升约7.50%,液化点判别成功率下降了3.70%。Model-1对经过FC修正后数据点的判别成功率更均衡,且均有较高的判别成功率,建议采用本文推荐的Model-1进行液化判别时,先对细粒含量进行修正。
为分析不同方法通过FC修正对建立的概率模型判别成功率的影响,本文选取了NCEER方法和Idriss方法共用的修正参数作为对照组,计算公式如式(13)(14),其中αβ为NCEER方法和Idriss方法FC中的计算参数6。采用经该方法修正后的数据再次训练模型,拟合得到校正后的概率模型Model-2。
N1,60CS=α+βN1,60
α=0e1.76-190FC25.0  FC5%5%<FC<35%FC35%, β=1.0(0.99+(FC21000))1.2  FC5%5%<FC<35%FC35%
表6分别给出了不同模型对于液化点和非液化点的判别成功率。Model-1对液化点、非液化点的判别成功率分别为85.70%、82.50%;Model-2对液化点、非液化点的判别成功率分别为87.80%、70.00%。图9给出了Model-1、Model-2与现场液化调查数据的相对关系,两个模型的液化临界曲线规律相同且接近。结合表4可知,Model-2对液化点判别成功率较Model-1提升约2%,非液化点判别成功率下降12.50%,模型Model-1具有更好的稳定性。综上所述,在运用本文概率模型进行液化判别时,需先对N1,60值通过细粒含量修正系数进行修正,推荐使用Model-1中的修正参数对现场液化调查数据进行修正。
地下水位会影响饱和土的区域范围及地表下任一点的有效应力,从而改变土壤液化的敏感性4。通过上覆应力修正系数(CN),可以将上覆有效应力为任意值处土层的SPT贯入阻力值归一化为一个大气压处土层的贯入阻力值。为探究其对模型判别成功率的影响,本文判别了CN修正前后两种工况,如式(15)(16)所示,其中Paσv’、N60N1,60分别为大气压力、上覆有效应力、经标贯试验设备修正后的标贯值和经参数修正后的标贯值。
CN=(Paσv')0.5,CN1.7
N1,60=CNN60
图10给出了CN修正前对数据点的判别结果,其中较多的液化点被判定为不会发生液化,CN修正前,Model-1对液化点、非液化点的判别成功率分别为67.30%、92.50%;而CN修正后,液化点、非液化点的判别成功率分别为85.70%、82.50%。修正后液化点的判别成功率上升约18.40%,非液化点判别成功率下降了10.00%。经CN修正后,模型对数据点的判别成功率更均衡,建议采用本文推荐的Model-1进行液化判别时,先利用上覆有效应力归一系数进行修正。
初始上覆有效应力增大会导致土的膨胀趋势降低,从而导致初始液化所需的CSR减小。通过上覆有效应力修正系数(Kσ)对地震引起的CSR进行校正,可以将基于SPT的“简化方法”拓展到较深土层的液化评价4。为探究Kσ对模型判别成功率的影响,本文判别了Kσ修正前后两种工况,如式(17)所示,其中Paσv’、f分别为大气压力、上覆有效应力和与相对密度有关的参数。
Kσ=(σv'Pa)f-1
图11给出了Kσ修正前模型的判别结果,其中部分非液化点被判别为发生液化。Kσ修正前,Model-1对液化点、非液化点的判别成功率分别为85.70%、80.00%;而Kσ修正后,液化点、非液化点的判别成功率分别为85.70%、82.50%,非液化点判别成功率上升了2.50%,且经过Kσ修正后数据点的判别成功率更均衡,建议使用本文推荐的Model-1进行液化判别时,先利用上覆有效应力校正系数进行修正。
土体是否发生液化与地震动密切相关,越大的地震,持时越长,震动循环次数越多。由于原始液化触发曲线是基于Mw=7.5级地震给出的,因此震级影响系数(MSF)可以考虑与震级相关的地震动持时对CSR的影响4。为探究MSF对概率模型判别成功率的影响,本文判别了MSF修正前后两种工况,如式(18)所示,其中Mw为震级。
MSF=6.9e(-Mw4)-0.058,MSF1.8
图12给出了MSF修正前模型对数据点的判别结果,其中较多非液化点被判定为发生液化,MSF修正前,Model-1对液化点、非液化点的判别成功率分别为89.80%、67.50%;MSF修正后,液化点、非液化点的判别成功率分别为85.70%、82.50%。MSF修正后虽然液化点判别成功率略有降低,但非液化点的判别成功率上升了22.60%,模型对数据点的判别成功率更均衡,建议采用本文推荐的Model-1进行液化判别时,先利用震级影响系数进行修正。
本文选取SPT钻孔Yuanlin-YL-BH-42作为研究对象,分析本文方法在实际工程中的应用效果,采用本文提到的NCEER方法、Idriss方法、Cetin模型和神经网络模型方法作为对比方法。实际工程案例来源于1999年“集集地震”,在此期间,中国台湾地区发生了广泛的砂土液化现象,勘察人员进行了大量的现场标准贯入试验。1999年“集集地震”震级为7.6级。Yuanlin-YL-BH-6钻孔位于台湾彰化县元林乡附近,数据来自Youd等3的研究。在此次地震中,该镇发生了严重的砂土液化,导致了液化相关的灾害。钻孔位于经度120.56°,纬度23.97°。最大地表峰值加速度为0.23 g,地下水位为0.0 m。钻孔剖面如图13所示。土层由细砂和粉土层组成,且处于饱和状态,各种方法的评估结果见图14
图14可知,本文提出的模型与NCEER方法、神经网络模型算法计算结果基本一致,仅在液化区和非液化区域的大小有所差异,模型判为液化层的区域位于上层,该处为砂土以及部分含黏粒土,上覆有效应力较小,且土体基本处于饱和状态,在高地震烈度下存在一定的液化风险,模型将该区域判为液化区是合理的,Idriss方法和Cetin模型计算结果则存在多个液化区,略显保守,再次印证了本文方法在实际工程中有一定的应用前景。
本文基于逻辑回归算法建立了砂土液化判别概率模型,通过与现有方法对比,验证了模型的有效性,并分析了细粒含量修正系数、上覆有效应力归一系数、上覆有效应力校正系数、震级影响系数等参数对液化判别成功率的影响。主要结论如下:
(1)本文基于逻辑回归算法提出的砂土液化判别概率模型对液化、非液化案例的回判成功率分别为85.70%,82.50%;对验证集的判别成功率达88.00%、72.00%,具有良好的判别成功率,同时可以给出土体液化发生的概率。
(2)在使用本文提出的砂土液化判别概率模型时,需通过细粒含量修正系数、上覆应力修正系数、上覆有效应力校正系数、震级影响系数对现场SPT原位测试结果进行修正,以提高液化判别成功率。
(3)通过案例分析,本文提出的模型在新数据集中同样具有较高的液化判别成功率,同时还可给出具体的判别公式,结合各参数修正,未来还可在纳入新样本后对模型进行改进。
虽然本文建立的概率模型已具有与现有方法相当的判别成功率,但训练模型时采用的数据集样本量偏少,模型虽采用动剪应力比以及修正后的标贯击数来综合地震动荷载、环境条件以及土体性质的影响,但未进一步详细量化各因素的变异性对计算结果的影响,模型在某些条件下判别成功率还有待提升。未来需要收集更多的现场液化案例SPT数据以丰富基础数据集,并在本文模型基础上对液化影响因素进行扩充,量化不确定性的影响以对模型进行进一步的优化。

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2026年第24卷第3期
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doi: 10.13244/j.cnki.jiwhr.20250257
  • 接收时间:2025-10-28
  • 首发时间:2026-06-25
  • 出版时间:2026-05-28
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  • 收稿日期:2025-10-28
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    1中国电建集团成都勘测设计研究院有限公司,四川 成都 610072
    2中国水利水电科学研究院 流域水循环与 水安全全国重点实验室,北京 100038
    3水利部水工程抗震与应急支持工程技术研究中心,北京 100048

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杨正权(1980—),博士,正高级工程师,博士生导师,主要从事土动力学与土工结构抗震研究。E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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