基于标贯试验的砂土液化概率判别法
DOI:
作者:
作者单位:

1.同济大学;2.中国能源建设集团广东省电力设计研究院

作者简介:

通讯作者:

中图分类号:

TU435

基金项目:

国家自然科学基金(41672276);科技部创新人才推进计划重点领域创新团队项目(2016RA4059)


Probabilistic Evaluation of Sand Liquefaction Potential Based on Standard Penetration Test
Author:
Affiliation:

1.Tongji University;2.China Energy Engineering Group Guangdong Electric Power Design Institute Co., Ltd.

Fund Project:

National Natural Science Foundation of China (No. 41672276); The Key Innovation Team Program of MOST of China (No. 2016RA4059)

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    摘要:

    合理地对建设场地进行液化判别是降低液化灾害的基础。我国规范通过比较标贯击数临界值与实测标贯击数值的相对大小来判别砂土液化,但由于建立经验判别准则的过程中存在大量的不确定性因素,导致这种确定性方法不是衡量砂土液化的准确指标。针对这种情况,本文基于我国大陆地区标贯试验的液化案例库,利用极大似然法对四种广义线性模型进行参数标定,建立了适用于我国大陆地区的液化概率判别模型。结果表明,当液化概率较小时,四种广义线性模型的差异显著;当液化概率在30%~70%之间时,四种模型的预测结果相近。模型比较表明,Log-log模型对案例库的拟合效果最好,由此给出了基于Log-log模型的液化概率计算公式及指定液化概率下的标贯击数临界值计算公式。回判分析表明,本文提出的液化概率判别模型的总体回判成功率高于现行建筑抗震设计规范。

    Abstract:

    Reasonable liquefaction assessment of construction site is the basis of reducing liquefaction hazard. The current Chinese seismic design code evaluates the liquefaction potential by comparing the critical value of standard penetration test blow count with the measured value of standard penetration test blow count. However, due to the significant uncertainties in the process of establishing empirical criteria, this deterministic method is not an accurate index to evaluate the liquefaction potential. In this paper, the maximum likelihood method is used to calibrate the four generalized linear models based on the Chinese mainland liquefaction database, and four probabilistic evaluation models of soil liquefaction potential are established. The results show that the four generalized linear models differ significantly when the liquefaction probability is small, and the prediction results of the four models are similar when the liquefaction probability is between 30% and 70%. Comparison of the models shows that the Log-log model fits the database best. The calculation formulas of liquefaction probability and the critical value of standard penetration test blow count under specified liquefaction probability based on the Log-log model are given. The results of verification analysis show that the verification success ratio of the proposed liquefaction probability evaluation model is higher than the current Chinese seismic design code.

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  • 收稿日期:2021-01-08
  • 最后修改日期:2021-02-23
  • 录用日期:2021-03-24
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