防灾减灾工程学报2024，Vol.44Issue(3)：670-677,8.DOI:10.13409/j.cnki.jdpme.20231205001
某越江综合管廊河谷场地液化流滑侧向扩展研究
Research on Liquefaction-induced Lateral Spreading in the Valley Site of the Utility Tunnel Crossing the Yangzi River
摘要
Abstract
Liquefaction-induced lateral spreading on river terraces presents significant threats to the nat-ural and built environments in the lower Yangtze River region.However,the extensive valley sites in the lower Yangtze River,spanning several kilometers,are characterized by thick,loose sediment lay-ers with highly uneven distribution.The nonlinear behavior of soil and kilometer-scale lateral deforma-tions pose challenges to numerical simulations of such sites.In this study,considering the complexity of the terrain and the specificity of the strata in wide valley sites of the lower Yangtze River,a refined model was developed based on geological profiles of actual engineering sites.Utilizing a sand liquefac-tion large deformation viscoelastic-plastic constitutive model and the ALE method,the study over came the simulation challenges associated with large deformation flow sliding in these sites.Consider-ing the influence of seismic wave types and intensities,the liquefaction distribution characteristics and lateral spread patterns of slightly inclined wide valley sites were analyzed.The results indicate that liq-uefaction was most severe at the base of the slope in slightly inclined liquefiable sites,and significant lateral spread seismic damage occurred in the riverbed of slightly inclined slope sites,revealing spatial displacement characteristics of lateral spread in slightly inclined liquefiable slope sites of wide valleys.This displacement is primarily attributed to variations in stress states of soil units across different posi-tions within wide valleys.By comparing with evaluation criteria for liquefaction-induced lateral spread damage levels,the characteristics and extent of liquefaction-induced lateral spread damage in slightly inclined slope sites of wide valleys in the lower Yangtze River were further clarified.关键词
宽河谷场地/长江岸坡/土层液化/侧向扩展/震害特征Key words
wide valley site/Yangtze River slope/soil liquefaction/lateral spread/damage characteris-tics分类
建筑与水利引用本文复制引用
李孝雄,赵瑞兴,庄海洋,赵凯..某越江综合管廊河谷场地液化流滑侧向扩展研究[J].防灾减灾工程学报,2024,44(3):670-677,8.基金项目
国家自然科学基金项目(51978333)、中国地震局地震工程与工程振动重点实验室重点专项(2020EEEVL030)资助 （51978333）
