摘要
利用GDS共振柱试验系统对不同干密度、不同含水率的断层泥试样进行了动剪切模量和阻尼比试验研究。结果表明,使用Hardin-Drnevich双曲线模型能够较好地描述断层泥的动剪切模量随剪应变的变化趋势;随干密度增加,动剪切模量和阻尼比均增大;而随含水率增加,动剪切模量和阻尼比均减小;归一化动剪切模量试验点主要位于Seed和Idriss提出的砂土G/G_(max)~γ曲线变动范围内,且与Sun和Seed推荐黏性土曲线变化趋势一致;在半对数坐标系中,阻尼比与动剪应变呈良好的线性关系,并给出了拟合关系式。
Dynamic shear modulus and damping ratio test of fault gouge with different dry density values or water contents are performed using GDS resonant column system. The results show that the relationship between dynamic shear modulus and dynamic shear strain can be well fitted by Hardin-Drnevich hyperbolic model. The dynamic shear modulus and the damping ratio both increase with the dry density,while decrease with water content. Experimental points of normalized dynamic shear modulus are mainly located in the range of the G / Gmax- γ curve of sand which is proposed by Seed and Idriss,and in accordance with the trend of cohesive soil which is proposed by Sun and Seed.The damping ratio changes linearly with the dynamic shear strain under semilog coordination. The fitting formula is suggested.
出处
《工程地质学报》
CSCD
北大核心
2017年第1期50-57,共8页
Journal of Engineering Geology
基金
河南省科技创新人才计划(154100510006)
河南省重点科技攻关项目(152102210111)
新疆维吾尔自治区高层次人才引进工程
新疆维吾尔自治区科技援疆(201491105)资助
关键词
断层泥
动剪切模量
阻尼比
含水率
干密度
共振柱试验
Fault gouge
Dynamic shear modulus
Damping ratio
Water content
Dry density
Resonant column test