非饱和混合土动剪切模量与阻尼比试验研究

崔凯; 林维康

doi:10.3969/j.issn.0258-2724.2016.05.028

非饱和混合土动剪切模量与阻尼比试验研究

doi: 10.3969/j.issn.0258-2724.2016.05.028

崔凯¹,
林维康²

基金项目:

国家自然科学基金资助项目（41572245）

详细信息

作者简介:
崔凯(1979-),男,副教授,博士,研究方向为特殊土非饱和力学特性,E-mail:cuikai@swjtu.edu.cn

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出版历程
- 收稿日期: 2016-08-10
- 刊出日期: 2016-10-25

Experimental Study on Dynamic Shear Modulus and Damping Ratio for Unsaturated Mixed Soil

CUI Kai¹,
LIN Weikang²

摘要

摘要: 川西山区广泛分布着崩坡积混合土，且在自然条件下常处于非饱和状态。动剪切模量和阻尼比是进行场地地震反应分析时必不可少的动力特性参量。为研究该地区上述两个参数的影响因素，运用动三轴仪，获取了小应变范围内循环荷载作用下混合土动应力应变骨干曲线、滞回曲线，拟合得到动剪切模量/最大动剪切模量-剪应变幅值和阻尼比-剪应变幅值曲线，系统研究了两个曲线函数随含水量和细颗粒含量的变化规律。研究结果表明：饱和程度和细颗粒含量对动剪切模量和阻尼比有显著影响，其影响程度还与矿物成分有关；在对比分析基础上，提出适用于崩坡积混合土在饱和、非饱和状态下的动剪切模量比和阻尼比推荐值，为川西山区地震安全评估提供参数取值依据。
- 非饱和 /
- 混合土 /
- 细颗粒含量 /
- 动剪切模量 /
- 阻尼比
Abstract: Talus mixed soil, widely distributed throughout the Western Sichuan mountainous area, is often unsaturated in nature. Dynamic shear modulus and damping ratio are essential parameters of the dynamic properties in the analysis of seismic response. In order to study the influential factors on these two parameters, dynamic triaxial apparatus was used to obtain the dynamic backbone curve and hysteresis curve of mixed soil under cyclic loading with small strain, as well as fitted Gd/Gmax- and - curves. The functions of two curves varying with the water content and the fine particle content were analyzed. The research results show that the saturation and fine particle content have significant effects on the dynamic shear modulus and damping ratio, and mineral constituents also play a role in the changes of these two parameters. Based on the comparative analysis, the recommended values of dynamic shear modulus ratio and damping ratio suitable were provided for talus mixed soil in saturation and non-saturation states.
- unsaturated /
- mixed soil /
- fine particle content /
- dynamic shear modulus /
- damping ratio

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