岩土力学2017，Vol.38Issue(3)：672-677,684,7.DOI:10.16285/j.rsm.2017.03.008
特殊应力路径下岸坡饱和土体变形特性模拟
Deformation characteristics simulation of bank slope saturated soils under special stress paths
摘要
Abstract
The bank slope soils are periodically influenced by the fluctuation of reservoir level,and its stress process can be described as multi-cyclic loaiding-unloading process of the effective stress in the pre-consolidation pressure range.The triaxial test of soil stress path is used to simulate the cyclic loading-unloading of soil pore water pressure,and the deformation and development laws of soil are predicted by extending the unified hardening model and modifying the loading-unloading criteria.The results show that during the cyclic loading-unloading process,the volume deformation of the soil is periodically elastic,and the shear strain is in a spiral upward trend and its increment gradually decreases with the number of cycles.During the unloading and confining pressure yielding stage,the soil deformation shows a dilatancy feature of volume expansion and a brittle trend of shear strain increase.The measured pore pressure drops dramatically and the peak intensity point occours when the shear deformation is at about 6％.The relationship between the compression curve coefficient and the number of loading-unloading is established,and the loading-unloading rules of the overconsolidated soil are modified.The extended unified hardening model can predict the deformation characteristics of the bank saturated soil under the special stress paths.关键词
循环加卸载/应力路径/统一硬化模型/加卸载准则Key words
cyclic loading-unloading/stress path/unified hardening model/criteria of loading-unloading分类
建筑与水利引用本文复制引用
陈勇,杨迎,曹玲..特殊应力路径下岸坡饱和土体变形特性模拟[J].岩土力学,2017,38(3):672-677,684,7.基金项目
国家自然科学基金(No.51409149).This work was supported by the National Natural Science Foundation of China (51409149) （No.51409149）
