太原理工大学学报2026，Vol.57Issue(4)：766-776,11.DOI:10.16355/j.tyut.1007-9432.20240159
不同加载路径下饱和砂土的静力液化失稳试验研究
Experimental Investigations on the Static Liquefaction-related Instability of Saturated Loose Sand with Varied Loading Paths
摘要
Abstract
[Purposes]To investigate how loading path affects the static liquefaction responses of the saturated sand.[Methods]The static liquefaction responses of saturated loose sand were investi-gated by performing the triaxial tests involving varied loading paths.[Results]The test results show that the saturated loose sand liquefies with different confining stresses when subjected to undrained tri-axial compression loading path.The presence of initial shear prior to the undrained triaxial compres-sion accelerates the onset of static liquefaction related instability.The suppressed contraction occurs in the saturated loose sand sample when constant deviator stress is imposed in the undrained condition,which leads to a slow build-up of the excess pore water pressure and spontaneous liquefaction.The un-drained loading is not a necessity to trigger the static liquefaction related instability.Under the drained condition,static liquefaction related instability arises in the saturated loose sample when subjected to the loading path involving the increase of the deviator stress as well as the drop of the effective radial stress with a rate of-0.5 kPa/s.The effective stress ratio(q/p′)of the saturated loose sand under the varied loading paths is approximately 0.74,and the corresponding internal friction angle is 19.2°.The flow liquefaction line(FLL)is not an inherent property of the sand with the absence of physical signifi-cance.Whether the instability initiates or not when the effective stress path of saturated loose sand ap-proaches the FLL is largely controlled by the loading path.With a certain loading path,the static lique-faction related instability may be triggered once δp′/δσ′3=1 is attained,and to achieve this it should be ensured that loading path before the initiation of instability has not significantly affected the void ratios of samples.关键词
静力液化/失稳/加载路径/饱和疏松砂土/三轴试验Key words
static liquefaction/instability/loading path/saturated and loose sand/triaxial tests分类
建筑与水利引用本文复制引用
张希栋,段伟,王振昂,杨昌兴,晏勤,王元博,路野..不同加载路径下饱和砂土的静力液化失稳试验研究[J].太原理工大学学报,2026,57(4):766-776,11.基金项目
山西省科技厅基础研究计划青年科学研究项目(20210302124110,202103021223057) （20210302124110,202103021223057）
中国博士后科学基金面上项目(2022M712338) （2022M712338）
国家自然科学基金资助项目(52208362,52108332) （52208362,52108332）
