非饱和粉土回弹模量的应力依赖性与水敏感性耦合分析

山东大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (2): 84-88.

非饱和粉土回弹模量的应力依赖性与水敏感性耦合分析

弋晓明1,2,李术才1,王松根2,刘振清2

1．山东大学岩土与结构工程研究中心，山东济南 250061；
2．公路养护技术国家工程研究中心，北京100029;

收稿日期:2012-09-20 出版日期:2013-04-20 发布日期:2012-09-20
作者简介:作者简介:弋晓明(1985-),男,河南郑州人,博士研究生,主要研究方向为岩土工程.E-mail:yixiaoming1985@126.com
基金资助:
国家自然科学基金资助项目(51208284)

Coupling analysis of stress dependence and water sensitivity for the resilient modulus of unsaturated silt soil

YI Xiao-ming1,2, LI Shu-cai1, WANG Song-gen2, LIU Zhen-qing2

1. Geotechnical and Structural Engineering Research Center,ShandongUniversity,Jinan250061,China; 2. National Engineering Research Centerof Road Maintenance Technologies,Beijing100029,China

Received:2012-09-20 Online:2013-04-20 Published:2012-09-20

摘要/Abstract

摘要：

为了研究路基内部应力状态和含水率变化对回弹模量的影响,建立了路基土回弹模量的预估模型。根据室内三轴重复加载试验结果,研究了应力依赖性控制指标的选择,结果表明:体应力变化时,回弹模量不具有单调变化的规律,所以不宜作为应力依赖性的控制指标;而利用围压和偏应力作为控制指标时则能全面的反映回弹模量的变化规律。根据土水特征曲线,利用基质吸力表征含水率的影响,构建应力依赖性和水敏感性的耦合模型,并通过试验结果的拟合验证,发现该模型能够较好地反映回弹模量随应力水平和含水率变化的规律。

关键词: 非饱和粉土, 应力依赖性, 水敏感性, 耦合分析

Abstract:

The influences of stress and water content on the subgrade resilient modulus were studied by constructing the prediction model. According to the results of repeated loading tri-axial test, the control indicator was researched. The results showed that the resilient modulus presented different changes with the volume stress increasing, which was unsuitable to reflect the stress dependent of resilient modulus. The confining pressure and the deviatoric stress were more appropriate to be the control indicators. Based on the soil water characteristic curve, the relationship between matric suction and water content was analyzed, and the matric suction was used in the prediction model to express the influence of the water content on the resilient modulus. The model could couple the stress dependence and water sensitivity, and also could well reflect the effects of stress and water, which was verified by the experimental results fitting.

Key words: unsaturated silt soil, stress dependence, water sensitivity, coupling analysis

中图分类号:

U416

弋晓明1,2,李术才1,王松根2,刘振清2. 非饱和粉土回弹模量的应力依赖性与水敏感性耦合分析[J]. 山东大学学报(工学版), 2013, 43(2): 84-88.

YI Xiao-ming1,2,LI Shu-cai1,WANG Song-gen2,LIU Zhen-qing2. Coupling analysis of stress dependence and water sensitivity for the resilient modulus of unsaturated silt soil[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2013, 43(2): 84-88.

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