粉土动态回弹模量试验研究
来源期刊：中南大学学报(自然科学版)2012年第12期
论文作者：董城 冷伍明 李志勇
文章页码：4834 - 4839
关键词：粉土；动回弹模量；动三轴试验；应力依赖；回归分析；预估模型
Key words：silt; dynamic resilient modulus; dynamic-triaxial test; stress-dependent; regression analysis; prediction model
摘 要：利用动三轴试验，研究粉土动态回弹模量的影响因素及其规律，分析动态回弹模量对偏应力、侧应力和体应力的依赖关系，在回弹模量本构预估模型的基础上，采用偏应力和体应力为变量的动态回弹模量本构模型对试验数据进行回归分析。结果表明：动态回弹模量随围压和压实度的提高而增大，随循环偏应力和含水量的增大而减小。所选模型具有较高的决定系数，证明所选模型具有较高的合理性与可靠性，同时获得了不同含水量和压实度下粉土的动态回弹模量预估模型，可为基于动力学的路面结构设计提供参数。
Abstract: For the sake of investigating the factors which affect the silt dynamic resilient modulus and their laws, a series resilient modulus tests were carried out by conducting dynamic-triaxial test. The relationships between deviation stress, confining stress, bulk stress and dynamic resilient modulus were analyzed. Considering that dynamic resilient modulus is a function of deviation stress and bulk stress, with a brief introduction of the present resilient modulus constitutive prediction models, the dynamic resilient modulus constitutive model which reflects the effect of bulk stress and deviator stress was utilized for experimental data regression analysis. The results demonstrate that dynamic resilient modulus rise with the increase of confining stress and compaction degree, in reverse of circular deviator stress and moisture content. A high relativity between the predictive results and the experimental value shows that the model which reflects the effect of bulk stress and deviator stress is accurate and credible. A high coefficient of determination shows that the model which reflects the effect of bulk stress and deviator stress is accurate and credible. The prediction models for different compaction degrees, and moisture content were achieved, and they can provide parameters for the pavement design based on dynamic method.
董城1, 2，冷伍明1，李志勇2
(1. 中南大学 土木建筑学院，湖南 长沙，410075；
2. 湖南省交通科学研究院，湖南 长沙，410015)
摘 要：利用动三轴试验，研究粉土动态回弹模量的影响因素及其规律，分析动态回弹模量对偏应力、侧应力和体应力的依赖关系，在回弹模量本构预估模型的基础上，采用偏应力和体应力为变量的动态回弹模量本构模型对试验数据进行回归分析。结果表明：动态回弹模量随围压和压实度的提高而增大，随循环偏应力和含水量的增大而减小。所选模型具有较高的决定系数，证明所选模型具有较高的合理性与可靠性，同时获得了不同含水量和压实度下粉土的动态回弹模量预估模型，可为基于动力学的路面结构设计提供参数。
关键词：粉土；动回弹模量；动三轴试验；应力依赖；回归分析；预估模型
DONG Cheng1, 2, LENG Wu-ming1, LI Zhi-yong2
(1. School of Civil Engineering and Architecture, Central South University, Changsha 410075, China;
2. Hunan Communications Research Institute, Changsha 410015, China)
Abstract:For the sake of investigating the factors which affect the silt dynamic resilient modulus and their laws, a series resilient modulus tests were carried out by conducting dynamic-triaxial test. The relationships between deviation stress, confining stress, bulk stress and dynamic resilient modulus were analyzed. Considering that dynamic resilient modulus is a function of deviation stress and bulk stress, with a brief introduction of the present resilient modulus constitutive prediction models, the dynamic resilient modulus constitutive model which reflects the effect of bulk stress and deviator stress was utilized for experimental data regression analysis. The results demonstrate that dynamic resilient modulus rise with the increase of confining stress and compaction degree, in reverse of circular deviator stress and moisture content. A high relativity between the predictive results and the experimental value shows that the model which reflects the effect of bulk stress and deviator stress is accurate and credible. A high coefficient of determination shows that the model which reflects the effect of bulk stress and deviator stress is accurate and credible. The prediction models for different compaction degrees, and moisture content were achieved, and they can provide parameters for the pavement design based on dynamic method.
Key words:silt; dynamic resilient modulus; dynamic-triaxial test; stress-dependent; regression analysis; prediction model
