岩土工程学报2026，Vol.48Issue(6)：1300-1308,9.DOI:10.11779/CJGE20250427
积石山地震诱发青海中川液化流滑饱和黄土的动力特性研究
Study on dynamic characteristics of saturated loess with liquefied flow-slide induced by Jishishan earthquake in Zhongchuan,Qinghai Province
摘要
Abstract
The 2023 Jishishan Mw6.2 earthquake induced the liquefaction flow slip of loess in Zhongchuan Township.In order to reveal its low-angle long-distance slip mechanism,based on the dynamic triaxial tests and microstructure analysis of undisturbed saturated loess samples,the effects of confining pressure and dynamic stress amplitude on the changes of dynamic strain and pore water pressure are studied.The results show that the development of dynamic strain is characterized by three stages.The change of pore pressure is controlled by dynamic stress and confining pressure.Under low dynamic stress,the pore pressure increases slowly,and the liquefaction critical value is high.Under high dynamic stress,the pore pressure increases rapidly,and the liquefaction critical value decreases.The peak values of dynamic strain and pore pressure increase synchronously in the early stage,and lose synchronization in the later stage.The normalized analysis shows that the two have dynamic correlation.Microscopically,liquefaction destroys the overhead pore structure and promotes the pore connectivity to form a seepage channel.Quantitative analysis shows that the pore complexity increases and the shape regularity decreases.Dynamic load causes structural collapse,and enhanced seepage leading to,pore pressure rise and effective stress loss.Such synergistic strain development,ultimately triggers saturated loess liquefaction.关键词
积石山6.2级地震/饱和黄土/孔隙水压力/动应变/液化Key words
Jishishan Mw6.2 earthquake/saturated loess/pore water pressure/dynamic strain/liquefaction分类
建筑与水利引用本文复制引用
贾世超,钟秀梅,王谦,王羿,王妍,胡雪枫..积石山地震诱发青海中川液化流滑饱和黄土的动力特性研究[J].岩土工程学报,2026,48(6):1300-1308,9.基金项目
中国地震局兰州地震研究所基本科研业务费项目(LISCEA202505,IESCEA202402) （LISCEA202505,IESCEA202402）
地震科技星火计划项目(XH25037C) （XH25037C）
甘肃省地震局创新团队专项(2020TD-01-01) （2020TD-01-01）
甘肃省陇原青年英才工作任务项目和国家自然科学基金项目(51778590,51408567)This work was supported by Basic Scientific Research Fund of Lanzhou Institute of Seismology,China Earthquake Agency(Grant Nos.LISCEA202505,IESCEA202402),Science for Earthquake Resilience Program(Grant No.XH25037C),Innovation Team Program of Gansu Earthquake Agency(Grant No.2020TD-01-01),Longyuan Youth Talent Program of Gansu Province and National NaturalScience Foundation of China(Grant No.51778590,51408567). （51778590,51408567）
