摘要
采用空心圆柱扭剪仪对含细粒饱和砂土进行动力特性试验。试验结果表明:波浪荷载作用下,砂土的液化周次明显小于动三轴和动扭剪试验的振动周次;随着细粒含量的增大,含细粒砂土的液化周次先减小后增加,细粒含量为10%左右时最小;细粒含量较小时,含细粒砂土超静孔隙水压发展规律类似纯砂,当细粒含量达到15%以上时,逐渐呈现出类似黏土的规律;细粒含量、有效围压对模量归一化曲线无影响;掺加细粒后砂土的阻尼比归一化曲线受围压影响比较明显,有效围压越大,阻尼比越小。
The dynamic characteristics of saturated sand with fine grains were studied by hollow cylinder apparatus torsional shear test.The test results showed that the liquefaction cycles for sands under wave load by hollow cylinder torsional shear test were obviously smaller than that one by dynamic triaxial or dynamic torsional shear test;with the increase of fine grained content,the liquefaction cycles for sand with fine grained content first decreased and then increased,when the content of fine grains was about at 10%,the cycles were lowest;when the fine grained content was smaller,the development rule of excess pore water pressure of sand with fine graines was similar to that of pure sand,when the fine grained content reached more than 15%,the rule of clay gradually appeared.The results showed that the content of fine grains and the effective confining pressure had no effect on the modulus normalization curve;the damping ratio normalization curve of sand mixed with fine particles was obviously affected by the confining pressure,and the larger the initial effective confining pressure,the smaller the damping ratio.
作者
周莹
蔡有庆
朱志慧
ZHOU Ying;CAI Youqing;ZHU Zhihui(College of Civil Science and Engineering,Yangzhou 225127,China)
出处
《工业建筑》
CSCD
北大核心
2020年第5期58-65,30,共9页
Industrial Construction
基金
江苏省自然科学基金项目(BK20141279)
扬州大学研究生科研创新计划(XKYCX19_088)。
关键词
含细粒砂土
波浪荷载
液化
动模量
阻尼比
sand with fine grains
wave load
liquefaction
dynamic modulus
damping ratio
