磐安结构性黄土动阻尼特征及其演化规律研究

慕焕东; 孙萍; 李荣建; 朱思珍

磐安结构性黄土动阻尼特征及其演化规律研究

1.
西安理工大学岩土工程研究所, 陕西西安 710048
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

国家自然科学基金项目 41472296

国家自然科学基金项目 11072193

陕西省黄土力学与工程重点实验室项目 14JS064

中国地质调查项目 DD20160271

详细信息

作者简介:
慕焕东(1989-), 男, 助理实验师, 地质工程专业, 主要从事岩土工程试验测试分析及模型试验方面的研究工作。E-mail:mhdyhx@xaut.edu.cn

通讯作者:
孙萍(1978-), 女, 博士, 副研, 主要从事工程地质、地质灾害方面的研究工作。E-mail:sunpingcgs@163.com

中图分类号: P642
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- 被引次数: 0
出版历程
- 收稿日期: 2017-05-28
- 刊出日期: 2017-12-01

DYNAMIC DAMPING CHARACTERISTICS AND EVOLUTION LAW OF PAN'AN STRUCTURAL LOESS

1.
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 地震作用往往会导致结构性黄土动强度的衰减，引发黄土滑坡、振陷等一系列地质灾害，而强度的衰减与其阻尼特性密切相关，因而结构性黄土的动态阻尼特征及其演化规律问题是岩土工程抗震的重要研究课题之一。为此，以天水磐安结构性黄土为研究对象，开展了天然、饱和条件下原状黄土和重塑黄土的动力学特性试验。在试验基础上，分析并比较了黄土的动模量、动阻尼响应特征及其演化规律。研究表明：天然、饱和条件下原状黄土和重塑黄土的动应力随动应变的增大而增大，动模量随动应变的增大而减小，动阻尼比随着动应变的增大而增大；受黄土结构性的影响，原状黄土的最大动模量比重塑黄土的稍大，原状、重塑黄土的最大动模量比饱和原状、饱合重塑黄土的稍大；黄土结构性较强时需要考虑试样固结应力对阻尼比的影响，饱和重塑黄土可以忽略试样固结应力对阻尼比的影响。
- 黄土 /
- 结构性 /
- 动阻尼 /
- 动模量
Abstract: Seismic action often leads to the decay of dynamic strength of structural loess and a series of geological disasters such as loess landslide and depression, and attenuation of intensity is closely related to its damping characteristics, which makes dynamic damping characteristics of structural loess and its evolution law one of the important research topics of geotechnical engineering. In this article, the dynamic characteristics of undisturbed loess and remolded loess under natural and saturated conditions were studied. On the basis of experiments, the dynamic modulus, dynamic damping response characteristics and evolution law of loess are analyzed and compared. The results show that:(1) The dynamic stress of the original loess and remolded loess increases with the increase of the dynamic strain, while the dynamic modulus decreases with the increase of the dynamic strain, and the dynamic damping ratio increases with the increase of the dynamic strain; (2)Affected by structural properties of loess, the undisturbed loess is slightly larger than that of the remolded loess, and the maximum modulus of the undisturbed loess and remolded loess are slightly larger than that of saturated undisturbed loess and saturated remolded loess. The influence of the surrounding pressure on the damping ratio needs to be considered when the loess structure is strong, and the effect of the surrounding pressure on the damping ratio can be neglected by the saturated remolded loess.
- Loess /
- structural /
- dynamic damping /
- dynamic modulus

HTML全文

图 1 然含水率原状黄土σ_d~ε_d、E_d~ε_d关系曲线图

Figure 1. σ_d~ε_d、E_d~ε_dcurves of undisturbed loess with natural moisture content

下载: 全尺寸图片幻灯片

图 2 饱和含水率原状黄土σ_d~ε_d、E_d~ε_d关系曲线图

Figure 2. σ_d~ε_d、E_d~ε_dcurves of undisturbed loess with saturated moisture content

下载: 全尺寸图片幻灯片

图 3 天然含水率重塑黄土σ_d~ε_d、E_d~ε_d关系曲线图

Figure 3. σ_d~ε_d、E_d~ε_dcurves of remodeling loess with natural moisture content

下载: 全尺寸图片幻灯片

图 4 饱和重塑黄土σ_d~ε_d、E_d~ε_d关系曲线图

Figure 4. σ_d~ε_d、E_d~ε_dcurves of remodeling loess with saturated moisture content

下载: 全尺寸图片幻灯片

图 5 天然含水率原状黄土1/E_d~ε_d关系曲线

Figure 5. 1/E_d~ε_d curves of undisturbed loess with natural moisture content

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图 6 饱和含水率原状黄土1/E_d~ε_d关系曲线

Figure 6. 1/E_d~ε_d curves of undisturbed loess with saturated moisture content

下载: 全尺寸图片幻灯片

图 7 天然含水率重塑黄土1/E_d~ε_d关系曲线

Figure 7. 1/E_d~ε_d curves of remodeling loess with natural moisture content

下载: 全尺寸图片幻灯片

图 8 饱和含水率重塑黄土1/E_d~ε_d关系曲线

Figure 8. 1/E_d~ε_d curves of remodeling loess with saturated moisture content

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图 9 天然含水率原状黄土的λ~γ_d关系曲线

Figure 9. λ~γ_d curves of undisturbed loess with natural moisture content

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图 10 饱和含水率原状黄土的λ~γ_d关系曲线

Figure 10. λ~γ_d curves of undisturbed loess with saturated moisture content

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图 11 天然含水率重塑黄土的λ~γ_d关系曲线

Figure 11. λ~γ_d curves of undisturbed loess with natural moisture content

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图 12 饱和含水率重塑黄土的λ~γ_d关系曲线

Figure 12. λ~γ_d curves of undisturbed loess with saturated moisture content

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表 1 试样的物理力学性质指标

Table 1. Physical and mechanical properties of the sample

干密度ρ_d(g/cm³)	含水率w/%	比重G_S	塑限w_p/%	液限w₁/%	孔隙比e₀
1.45	13	2.67	18.8	27.9	0.887

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表 2 动模量线性回归参数

Table 2. Parameters of linear regression of dynamic modulus

类型	固结围压/kPa	回归参数
类型	固结围压/kPa	a/10^-3(MPa^-1)	b(MPa^-1)	E_dmax(MPa^-1)
原状黄土	100	16.50	6.11	60.6
	200	7.50	3.28	133.3
	300	6.00	2.69	166.7
原状饱和黄土	100	9.60	16.04	104.2
	200	8.90	10.02	112.4
	300	6.90	6.65	144.9
重塑黄土	100	27.00	7.90	37.0
	200	9.80	4.27	102.0
	300	5.13	2.47	194.9
重塑饱和黄土	100	23.00	20.00	43.5
	200	10.00	10.37	100.0
	300	5.50	9.93	181.8

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