围压与振动频率对饱和砾砂液化强度的影响  

Influence of Confining Pressure and Vibration Frequency on the Liquefaction Strength of the Saturated Gravel Sand

作　　者：张苏[1] 张远芳[1] 张凌凯 刘长江[1] 

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052

出　　处：《新疆农业大学学报》2015年第1期68-71,共4页Journal of Xinjiang Agricultural University

基　　金：新疆水利水电工程重点学科基金资助(xjzdxk-2002-10-05);新疆研究生科研创新项目课题(XJGRI2014071);新疆农业大学实验室建设与管理改革项目

摘　　要：采用TAJ-20振动三轴仪对饱和砾砂进行了不同围压、不同频率下的循环动三轴试验,研究了在均等固结的条件下围压与频率对饱和砾砂液化强度的影响。结果表明,饱和砾砂在均压固结条件下,其液化强度随着围压和振动频率的增大而增大,其达到液化破坏所需的时间也随着围压和振动频率的增大而急剧减少。不同围压下得到的动剪应力比与振动周次的关系可近似看做一条直线。液化强度与振动频率及围压的关系在半对数坐标图上均符合线性关系。A series of dynamic triaxial tests of different vibration frequencies and confining pressures for the saturated gravel sand are ac‐complished by using TAJ‐20 vibration triaxial apparatus under the condi‐tion of equal consolidation,so as to study the effect of vibration frequencies on its dynamic strength.The study results show that under the condition of equal consolidation,the dynamic strength of the saturated gravelly sand is increased with the increasing of vibration frequency and confining pressure.With the in‐creasing of confining pressure and vibration frequency,the liquefaction time is sharply reduced.The relation curve approximation of cyclic stress ratio and vibration time can nearly be regarded as a straight line under different confining pressure.The relationships between liquid strength and vibration frequency and confi‐ning pressure conformed with the linear relationships in arithlog chart.

关 键 词：动三轴试验 饱和砾砂 动强度 振动频率 围压 

分 类 号：TU441[建筑科学—岩土工程]