摘要
利用DDS-70微机控制电磁式振动三轴仪,在均等固结条件下,对黄河口饱和粉土进行了不同预剪应力和预剪振次的循环三轴试验,探讨了循环预剪作用对饱和粉土的抗液化强度和孔隙水压力发展规律的影响.试验结果表明:低水平的循环预剪应力不会使饱和粉土在循环预剪阶段破坏;随着循环预剪应力和循环预剪振次的增加,饱和粉土的抗液化强度得到提高,但当循环预剪振次达到某一值时,抗液化强度趋于稳定.对振动孔隙水压力比-振次比进行归一化后发现:无循环预剪作用时饱和粉土孔压发展模式为双曲线,有循环预剪作用时为反正弦曲线,反正弦曲线拟合参数较小,约为0.2～0.4.
Under the conditions of different cyclic preshearing stress and cyclic preshearing vibration times, cyclic triaxial tests on saturated silt of Yellow River estuary were conducted by DDS-70 microcom- puter control electromagnetic vibration triaxial apparatus to study the liquefaction resistance and dynamic pore water pressure of saturated silt. The results show that the saturated silt is not failed under low cyclic preshearing stress in cyclic preshearing stage. The liquefaction resistance of saturated silt is increased with the increase of cyclic preshearing stress and cyclic preshearing vibration times. The liquefaction re- sistance reaches a stable value after a certain vibration times. Normalized relationship between vibration cycles and pore water pressure can be fitted by hyperbola and arcsine functions. The mode of pore water pressure is hyperbola without cyclic preshearing, while with it, the mode is arcsine with small fitting pa- rameter of 0.2 to 0.4.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期345-350,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(51009054)
教育部科学技术研究重点项目(109077)
江苏省自然科学基金资助项目(BK2010513)
关键词
粉土
液化
循环预剪
孔隙水压力
拟合参数
silt
liquefaction
cyclic preshearing
pore water pressure
fitting parameter
