摘要
为探究南海海域饱和粉土的动力变形特性,利用GCTS循环三轴仪对琼州海峡饱和粉土进行了分级循环加载试验,研究了有效围压σ′_(3c)和相对密度D_(r)对饱和粉土动剪切模量G和阻尼比λ特性影响,并与陆域粉土以及砂土进行了比较。试验结果表明:在同一应变水平下,随着σ′_(3c)的增大,G逐渐增大,G/G_(max)~γ_(a)曲线逐渐抬高,λ~γ_(a)增长曲线逐渐降低;随着D_(r)的增加,G逐渐增大,G/G_(max)、λ~γ_(a)曲线变化不大;南海海域的饱和粉土动的G/G_(max)、λ~γ_(a)曲线的发展规律与陆域粉土以及砂土的基本一致,为此给出了饱和粉土的G/G_(max)、λ~γ_(a)曲线预测模型。
In order to explore the dynamic deformation characteristics of saturated silt in the South China Sea,a series of undrained multistage strain-controlled cyclic triaxial tests were conducted on saturated silt in Qiongzhou Strait,South China Sea.The influence of effective confining pressureσ′_(3c)and relative densities D_(r)on dynamic shear modulus G and damping ratioλof saturated silt was researched and compared with that of silt and sandy soil in land area.The test result shows that:at the same strain level,with the increase ofσ′_(3c),the dynamic shear modulus G gradually increases,the G/G_(max)~γ_(a)attenuation curve gradually rises and theλ~γ_(a)attenuation curve gradually decreases;with the increase of D_(r),the dynamic shear modulus G gradually increases and the G/G_(max),λ~γ_(a)attenuation curves have no significant change.The development law of the G/G_(max),λ~γ_(a)attenuation curves of saturated silt in the South China Sea is basically consistent with that of silt and sandy soil in land area.The empirical formulas for the prediction of shear modulus and damping ratio of saturated silt were proposed.
作者
周正龙
丁芷萱
刘杰
赵凯
梁珂
鹿庆蕊
Zhou Zhenglong;Ding Zhixuan;Liu Jie;Zhao Kai;Liang Ke;Lu Qingrui(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 211816,China;East China Univerity of Science and Technology,Nanchang 330013,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2022年第S01期227-233,共7页
China Civil Engineering Journal
基金
国家自然科学基金(51978335,52168044)
关键词
海域粉土
动剪切模量
阻尼比
动三轴试验
marine silt
dynamic shear modulus
damping ratio
cyclic triaxial test
