岩土工程学报2025，Vol.47Issue(11)：2246-2254,9.DOI:10.11779/CJGE20240591
初始剪应力和循环应力方向对饱和密砂液化特性的影响
Effect of initial static shear stress and cyclic loading direction on liquefaction characteristics of saturated dense sand
摘要
Abstract
Soil elements of slope are subjected to both initial shear stress and cyclic stress during seismic loading,and the directions of initial shear stress and cyclic stress are often different.In order to investigate the effects of initial shear stress and cyclic stress direction on the liquefaction characteristics of saturated dense sand,a series of consolidated undrained multi-directional cyclic simple shear tests are carried out on saturated dense sand.The test results show that the failure modes of saturated dense sand mainly include cyclic activity and cumulative plastic strain,and the failure modes are affected by the initial shear stress.The existence of initial shear stress will reduce the liquefaction resistance of saturated dense sand,but the liquefaction resistance of saturated dense sand under vertical loading mode is about 5%～7%higher than that under parallel loading mode.It is found that the cumulative rate of energy loss increases with the increase of initial shear stress,which is the internal reason for the decrease of liquefaction resistance of saturated dense sand.The normalized curves of residual pore pressure and energy loss of saturated dense sand show a linear relationship in the logarithmic coordinate.关键词
初始剪应力/抗液化强度/能量法/孔压模型/多向循环单剪试验Key words
initial static shear stress/liquefaction resistance/energy-based method/pore pressure model/multidirectional cyclic simple shear test分类
土木建筑引用本文复制引用
张迎宾,覃一巧,张世豪,魏江涛,熊亦翔,刘永航..初始剪应力和循环应力方向对饱和密砂液化特性的影响[J].岩土工程学报,2025,47(11):2246-2254,9.基金项目
国家自然科学基金项目(U2468214,52378370,52278372,52478362) （U2468214,52378370,52278372,52478362）
国家重点研发计划项目(2024YFE0111900)This work was supported by the National Natural Science Foundation of China(Grant Nos.U2468214,52378370,52278372,52478362),National Key R&D Program of China(Grant No.2024YFE0111900). （2024YFE0111900）
