非饱和黄土动力特性及其对场地地震动参数的影响

魏来; 卢育霞; 周正华; 王谦; 杨博; 唐洪敏; 李桐林

doi:10.11779/CJGE2019S2037

非饱和黄土动力特性及其对场地地震动参数的影响 English Version

魏来¹,
卢育霞^1,2,3, ,,
周正华⁴,
王谦^{1, 2, 3},
杨博¹,
唐洪敏¹,
李桐林¹

1. 中国地震局兰州地震研究所（黄土地震工程重点实验室）,甘肃兰州 730000;
2.甘肃省岩土防灾工程技术研究中心,甘肃兰州 730000;
3. 甘肃省地震局,甘肃兰州 730000;
4. 南京工业大学,江苏南京 210009

基金项目: 中国地震局地震预测研究所基本科研业务费项目（2015IESLZ05）; 国家重点研发计划项目课题（2017YFC1500900）

详细信息

作者简介:
魏来(1992— ),男,硕士研究生,主要从事岩土地震工程方面的研究。E-mail: 1610352686@qq.com。

通讯作者:
卢育霞，E-mail：yuxial@163.com

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出版历程
- 收稿日期: 2019-04-27
- 发布日期: 2019-07-19

Dynamic characteristics of unsaturated loess and their influences on ground vibration parameters of sites

WEI Lai¹,
LU Yu-xia^1,2,3, ,,
ZHOU Zheng-hua⁴,
WANG Qian^{1, 2, 3},
YANG Bo¹,
TANG Hong-min¹,
LI Tong-lin¹

1. Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China;
2. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu, Lanzhou 730000, China;
3. Earthquake Administration of Gansu Province, Lanzhou 730000, China;
4.Nanjing Tech University, Nanjing 210009, China

摘要

摘要: 针对宁夏西吉地区不同含水率非饱和黄土进行动三轴试验,在分析含水率对黄土动力特性影响的基础上,采用土层地震反应分析方法研究地表黄土层含水率变化对黄土场地地面运动强度和特征的影响规律。研究表明,随着含水率的升高,土的动剪切模量逐渐减小,阻尼比逐渐升高,当含水率达到塑限时,含水率变化对其影响明显减弱;总体上,随着输入地震动强度的增大和含水率升高,黄土场地地表地震动PGA和反应谱值呈现增大的趋势;而含水率对不同场地的地面运动强度和特征的影响差异性较大,对于覆盖层较薄的场地,在含水率达到20%时,当输入加速度峰值大于50 gal时地震动放大倍数开始减小,随着输入地震动的增大,减小程度增大,而反应谱长周期分量上谱值增大;覆盖层较厚场地在输入加速度峰值300 gal时,20%含水率土层的放大倍数有所降低,但反应谱值在0.3 s之后明显增大。
- 非饱和黄土 /
- 动剪切模量 /
- 阻尼比 /
- 土层地震反应 /
- PGA /
- 加速度反应谱
Abstract: The dynamic triaxial tests on the unsaturated loess in Xiji region of Ningxia under different water contents are carried out. Based on the analysis of the influences of water content on the dynamic characteristics of loess, the influences of water content of soil on the surface motion intensity and characteristics of a loess sites are studied by using the method of soil seismic response analysis. The results show that with the increase of water content, the dynamic shear modulus decreases and the damping ratio increases. When the water content reaches the plastic limit, the influences of change of water content are obviously reduced. On the whole, with the increase of input seismic motion and the increase of water content, the PGA and the values of reaction spectral in the loess site increase. And the influences of water content on the ground motion intensity and characteristics are different in different sites. For the thinner site, when the water content reaches 20%, and the input seismic motion is greater than 50 gal, the magnification begins to decrease, and with the increase of the input seismic motion, the decrease amplitude increases, while the value of the long period component of the reaction spectrum increases, and when the input seismic motion of thicker covering site reaches 300 gal, the magnification decreases when the water content reaches 20%, but the value of reaction spectra increased obviously after 0.3 s.
- unsaturated loess /
- dynamic shear modulus /
- damping ratio /
- soil seismic response /
- PGA /
- acceleration response spectrum

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参考文献(6)

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