应力历史影响下的膨胀土动力参数响应特征

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摘要动剪切模量和阻尼比是土动力非线性性能中最重要的两个参数。为考虑应力历史对膨胀土动力学特性的影响，开展加载、卸载和再加载固结路径下南阳膨胀土共振柱试验，利用双曲线模型和经验关系分别对动剪切模量和阻尼比随剪应变演化规律进行分析，提出膨胀土在剪应变值为5×10-6~10-2范围内的剪切模量比和阻尼比推荐值，同时分析应力历史影响下动剪切模量比和阻尼比的不确定性。研究表明，应力历史对最大动剪切模量与动剪切模量随剪应变演化规律都有很大影响，卸载和再加载条件下的最大动剪切模量较加载条件下的大，最大增幅为66.59%；应力历史对阻尼比的影响规律性不强。动剪切模量比的极小值均出现在加载路径；经历较大外荷载后，卸载程度越大，动剪切模量比不确定性越大；动剪切模量比和阻尼比的变异系数最大值分别达到了46.30%和48.99%，说明在工程设计和施工中应充分考虑应力历史对动剪切模量比和阻尼比的影响，根据相应的应力历史来选取土体动力学参数。

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	李晶晶1
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	孔令伟1
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关键词 ：膨胀土, 共振柱, 动剪切模量, 阻尼比, 应力历史

Abstract：Dynamic shear modulus and damping ratio are the most important parameters for nonlinearity characteristics of the soil dynamic property. To consider the influence of stress history on the dynamics characteristics of the expansive soil, resonant column tests were carried out with compression paths of loading, unloading and reloading. Hyperbola models and empirical relationship were used to analyze the dynamic shear modulus and damping ratio, respectively. The recommended values of dynamic shear modulus ratio and damping ratio with shear strain of 5×10-6~10-2 were proposed, and their uncertainty affected by stress history was analyzed. Results show that stress history has a pronounced influence on the maximum of dynamic shear modulus and its decay rule. The dynamic shear modulus is greater in unloading and reloading path than that of loading path, the greatest amplification of which is 66.59%, but it seems no obvious connection between stress history and damping ratio. After experiencing higher load, the more unloading extent is, the greater uncertainty of dynamic shear modulus ratio is, and the maximum variation coefficients of dynamic shear modulus ratio and damping ratio are up to 46.30% and 48.99%, respectively. Conclusion can be drawn that the influence of stress history on dynamic shear modulus ratio and damping ratio should be taken into account in engineering design and construction. Dynamic parameters should be selected on the basis of corresponding stress history of the soil.

Key words： expansive soil resonant column test dynamic shear modulus damping ratio stress history

收稿日期: 2016-08-08 出版日期: 2017-06-15

引用本文:

李晶晶1,2，孔令伟1,2. 应力历史影响下的膨胀土动力参数响应特征[J]. 振动与冲击, 2017, 36(12): 181-188.
Li Jing-jing1,2, Kong Ling-wei1,2. The influence of stress history on the dynamic parameters of expansive soils. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(12): 181-188.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I12/181

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