岩土工程学报2026，Vol.48Issue(4)：835-844,10.DOI:10.11779/CJGE20250056
基于强震记录的场地液化触发时间识别新方法
New method for detecting site liquefaction trigger time based on strong motion records
摘要
Abstract
The mechanical properties of soils undergo significant changes before and after liquefaction during an earthquake,which consequently lead to a qualitative shift in surface and structural damage mechanisms.Therefore,it is important to determine the liquefaction trigger time for grasping the dynamic evolution process of liquefaction disaster and liquefaction mitigation.In this study,a new method for detecting the trigger time of site liquefaction based on strong motion records is established.Based on the theoretical model of two-layer soil,the relationship between pore water pressure development,the site's basic period,and the frequency variation of surface acceleration is analyzed,and the basic principle of the method is clarified.The technical flow of the method is developed by quantifying the time-frequency characteristics of the acceleration records in terms of time-frequency analysis techniques and frequency decrease rate parameters.Using 24 strong motion records from actual liquefaction sites during 11 earthquakes worldwide,along with numerical simulations,the two established methods and the proposed method in this paper are compared and evaluated.The results demonstrate the advantages of the proposed method.The proposed method not only achieves higher accuracy,but its main control parameter is derived from the theoretical model,independent of empirical data,enhancing its generality and applicability.This approach overcomes the limitations of existing methods,such as their reliance on manual intervention,which hampers reproducibility,as well as their dependence on measured records,thereby facilitating broader applicability and implementation.关键词
场地液化/液化时间/时频分析/频率下降率Key words
site liquefaction/liquefaction triggering time/time-frequency analysis/frequency decrease rate分类
建筑与水利引用本文复制引用
闫倬闻,袁晓铭,袁近远,李瑞山,吴晓阳,杨阳,刘汉龙..基于强震记录的场地液化触发时间识别新方法[J].岩土工程学报,2026,48(4):835-844,10.基金项目
中国地震局工程力学研究所基本科研业务费专项项目(2024A03) （2024A03）
国家自然科学基金项目(52408525) （52408525）
黑龙江省自然科学基金项目(LH2024E119)This work was supported by the Basic Scientific Research Project of the Institute of Engineering Mechanics,China Earthquake Administration(Grant No.2024A03),the National Natural Science Foundation of China(Grant No.52408525)and the Natural Science Foundation of Heilongjiang Province(Grant No.LH2024E119). （LH2024E119）
