甘南地区黄土的动模量与阻尼比特性研究

王谦; 李娜; 王平; 侯鹏博; 钟秀梅; 王峻; 王会娟

doi:10.11779/CJGE2017S1038

甘南地区黄土的动模量与阻尼比特性研究 English Version

王谦¹,
李娜¹,
王平^1, ,,
侯鹏博²,
钟秀梅¹,
王峻¹,
王会娟¹

1. 中国地震局（甘肃省）黄土地震工程重点实验室,甘肃兰州 730000;
2. 中国能源建设集团甘肃省电力设计院有限责任公司,甘肃兰州 730000

基金项目: 中国地震局地震科技星火计划项目（XH16038Y）; 国家自然科学基金项目（51408567,51478444）; 甘肃省科技计划项目（1308RJZA153）

详细信息

作者简介:
王谦(1985-),男,甘肃临夏人,助理研究员,主要从事黄土动力学研究工作。E-mail:wangq0930@126.com。

通讯作者:
王平，E-mail：lanzhouwang_p@126.com

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出版历程
- 收稿日期: 2016-11-27
- 发布日期: 2017-11-19

Behaviors of dynamic modulus and damping ratio of loess in Gannan region of Gansu Province

1. Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration & Gansu Province, Lanzhou 730000, China, 2. Energy China GSEPDI, Lanzhou 730000, China

摘要

摘要: 通过室内动三轴试验,研究了甘南地区次生黄土的动本构关系,得到了模型参数,分析了甘南黄土的动剪模量比和阻尼比发展特征,提出了动剪切模量衰减模型和阻尼增长模型;并通过归一化处理和模型参数比较,对次生黄土与风成黄土动剪模量比和阻尼比的差异性进行了讨论。结果表明：次生黄土的动本构关系服从双曲线模型,模型参数a值较风成黄土无明显差异,但b值为相同条件下风成黄土b值的1.5~3倍,且模型参数与天然含水率、干密度等物性参数和固结围压不存在明显的相关性。次生黄土的初始动弹性模量E_dmax受固结条件、密度影响较大,相同条件下残坡积黄土的E_dmax较冲洪积黄土小。次生黄土的动剪模量比随动剪应变增大而减小,变化趋势满足负指数衰减模型;阻尼比随动剪应变的增大而增大,变化趋势服从对数关系;相比于风成黄土,其动剪模量比随动剪应变的增加衰减更快,阻尼比增长范围较窄,表明沉积环境对黄土动力特性的差异性影响显著。
- 次生黄土 /
- 动本构关系 /
- 动模量 /
- 阻尼比
Abstract: The dynamic constitutive relation of redeposited loess in Gannan region is investigated based on the dynamic triaxial tests. The model parameters are obtained, and the behaviors of dynamic shear modulus ratio and damping ratio are analyzed. The attenuation model for the dynamic shear modulus and the growth model for the damping ratio with dynamic shear strain are provided. Moreover, the differences about the shear modulus ratio and damping ratio between redeposited loess and eolian loess are discussed depending on the normalization processing and comparison of model parameters. The results show that the dynamic constitutive relation of redeposited loess obeys the hyperbolic model, and the value of model parameter a has no obvious difference with that of the eolian loess, but the value of b is 1.5 times that to 3 times that of the eolian loess under the same condition. The original dynamic elasticity modulus E_dmax of redeposited loess is greatly influenced by the consolidation condition and the loess density, and under the same condition, the value E_dmax of residual loess is smaller than that of alluvia loess. The dynamic shear modulus ratio of redeposited loess decreases with the increase of dynamic shear strain, and the variation trend of shear modulus ratio presents a tendency of negative exponential attenuation model. The trend of D ~γ_dobeys the logarithmic relationship which increases with the increase of dynamic shear strain. Compared with that of the eolian loess, the attenuation rate of the dynamic shear modulus of the redeposited loess is more quickly, and the increase range of the damping ratio is relatively narrow, which indicates the obvious influences of sedimentary environment on the differences of dynamic properties of loess.
- redeposited loess /
- dynamic constitutive relation /
- dynamic modulus /
- damping ratio

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参考文献(9)

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