水利学报Issue(7)：801-808,8.DOI:10.13243/j.cnki.slxb.2014.07.006
饱和黄河岸滩粉土循环荷载后的变形强度特性
Study on post-cyclic undrained deformation and strength characteristics of saturated silt in the floodplain of the Yellow River
摘要
Abstract
A number of triaxial compression tests with stress-controlled monotonic loading and post-cyclic monotonic loading were carried out on saturated silt in the Yellow River floodplain under the condition of consolidated undrained. The influence of cyclic stress amplitude, confining pressure and cyclic loading-in-duced pore-water pressure ratio on post-cyclic mechanical behavior of silt are investigated. A post-cyclic monotonic loading stress-strain model of silt has been established, in which the confining pressure and cy-clic loading-induced pore-water pressure ratio can be considered synthetically. It was found that the effect of cyclic stress amplitude on post-liquefaction mechanical behavior is little for the same cyclic loading-in-duced pore-water pressure ratio. The effective stress critical state lines are unique under monotonic and post-cyclic monotonic loading independent of cyclic loading history. Both the post-cyclic undrained shear strength and initial tangent modulus degrade compared to that under the monotonic loading. The degradation of initial tangent modulus is more marked than that of strength. The degradation level increases with increas-ing pore-water pressure ratio caused by cyclic loading. The post-cyclic undrained strength ratio and initial tangent modulus ratio as well as failure stress ratio are only function of pore-water pressure ratio generated by cyclic loading for different confining pressure. The post-cyclic stress-strain relationship can be described by hyperbolic model. The results predicted by the model are in good agreement with the experimental data.关键词
饱和粉土/黄河岸滩/循环荷载/单调加载/衰化/动孔压比/应力应变关系Key words
saturated silt/Yellow River floodplain/post-cyclic/monotonic loading/degradation/dynamic pore-water pressure ratio/stress-strain relationship分类
建筑与水利引用本文复制引用
陈存礼,马少雄,李雷雷,蔡宗鹏..饱和黄河岸滩粉土循环荷载后的变形强度特性[J].水利学报,2014,(7):801-808,8.基金项目
国家重点基础研究发展计划(973计划,2011CD403305),陕西省教育厅省级重点实验室重点科研资助项目(2010JS086) （973计划,2011CD403305）
