摘要
粉土属于在振动荷载作用下易于液化的土类,粉土液化问题值得重视。云南属于我国地震多发地区之一,随着该地区高速公路、铁路等工程的建设,云南粉土的动力特性研究显得尤为重要。通过动三轴试验,以循环荷载作用下累积耗损比能为指标,对饱和粉土耗损比能及振动孔隙水压力的增长规律进行研究。结果表明:随着循环振次的增加,累积耗损比能增长明显,单次耗损比能大体呈现增长态势但存在个别波动现象;云南饱和粉土振动孔压比的增长与累积耗损比能之间有密切关系,其关系受初始应力条件的影响;云南饱和粉土振动孔隙水压力的发展与初始应力归一化无量纲比能之间具有显著的回归关系。
Silt is a type of soil prone to liquefaction under vibration load. Silt liquefaction problem is an important issue. Yunnan Province is one of earthquake-prone areas in China. With the construction of highways and railways,study of the dynamic characteristics of Yunnan silt is particularly important. Based on dynamic triaxial tests in the laboratory,the dynamic pore water pressure of saturated silt was studied with the cumulative dissipated energy under cyclic loading as an index. The results show that an increase in cyclic vibration leads to a significant increase in cumulative dissipated energy and an increase in weekly energy dissipation with individual fluctuations. The dynamic pore water pressure of saturated silt in Yunnan Province has a close relationship with the cumulative dissipated energy,and the relationship is affected by the initiative stress. There is a significant regression relationship between the dynamic pore water pressure of saturated silt in Yunnan Province and the dimensionless ratio energy normalized by the initial stress.
出处
《水利与建筑工程学报》
2016年第6期137-141,共5页
Journal of Water Resources and Architectural Engineering
基金
江苏高校品牌专业建设工程一期项目资助项目(PPZY2015C213)
江苏省高等职业院校高级访问工程师计划资助项目资助(2015FG022)
江苏省金肯职业技术学院科研项目(2014KY02)
关键词
云南粉土
能量法
损耗比能
振动孔压
初始应力
Yunnan silt
energy analysis method
dissipated energy
dynamic pore water pressure
initial stress
