| 粉煤灰改良饱和黄土动力特性研究 |
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| 引用本文： | 高中南,钟秀梅,王峻,刘钊钊.粉煤灰改良饱和黄土动力特性研究[J].世界地震工程,2019,35(3):091-98. |
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| 作者姓名： | 高中南 钟秀梅 王峻 刘钊钊 |
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| 作者单位： | 1. 甘肃省地震局, 兰州 730000;2. 中国地震局黄土地震工程重点实验室, 兰州 730000;3. 兰州大学 土木工程与力学学院, 兰州 730000 |
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| 摘 要： | 以资源循环再利用与提高饱和黄土地基抗震性能为目的，通过对不同掺量粉煤灰改良饱和黄土进行动弹性模量-阻尼比试验，研究了动荷载作用下粉煤灰掺量对饱和改良黄土动骨干曲线的影响，同时对不同掺量粉煤灰改良饱和黄土初始动弹性模量、最大动应力幅值、动弹性模量与阻尼比进行了对比研究。研究结果表明:饱和压实素土与不同掺量粉煤灰改良饱和黄土动骨干曲线均可用双曲线模型进行描述，模型参数受粉煤灰掺量影响较大；粉煤灰的掺入可有效改善饱和黄土地基抗震性能，随粉煤灰掺量增加，不同掺量饱和改良黄土动弹性模量与阻尼比分别总体呈增大与减小趋势；考虑粉煤灰改良饱和黄土抗震性能与经济成本，提出了饱和改良黄土最佳粉煤灰掺量为20%~25%；并基于回归分析，给出了饱和改良黄土动弹性模量衰减经验公式与阻尼比增长经验公式及其拟合参数。
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| 关 键 词： | 粉煤灰 黄土 动弹性模量-阻尼比试验 动应力-应变关系 动力特性参数模型 |
Dynamic characteristics of saturated loess improved by fly ash |
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| GAO Zhongnan,ZHONG Xiumei,' target="_blank" rel="external">,WANG Jun,' target="_blank" rel="external">,LIU Zhaozhao.Dynamic characteristics of saturated loess improved by fly ash[J].World Information On Earthquake Engineering,2019,35(3):091-98. |
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| Authors: | GAO Zhongnan ZHONG Xiumei " target="_blank">' target="_blank" rel="external"> WANG Jun " target="_blank">' target="_blank" rel="external"> LIU Zhaozhao |
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| Affiliation: | 1. Earthquake administration of Gansu Province, Lanzhou 730000, China;2. Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration & Gansu Province, Lanzhou 730000, China;3. Schools of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | To recycle the resources and improve the seismic performance of saturated loess foundation, the influence of fly ash content on the dynamic backbone curves of improved saturated loess with different fly ash dosages under dynamic load were analyzed through dynamic elastic modulus-damping ratio tests on the improved saturated loess. Moreover, the initial dynamic elastic modulus, maximum dynamic stress amplitude, dynamic elastic modulus, and damping ratio of saturated loess improved by fly ash with different dosages were comparatively studied. The results show that:the dynamic backbone curves of the compacted saturated loess and the improved saturated loess with different fly ash dosages can be described by the hyperbolic model, but the model parameters are greatly affected by the fly ash dosages. The admixing of fly ash can effectively improve the seismic performance of saturated loess foundation. With the increase in content of fly ash, the dynamic elastic modulus and damping ratio of improved saturated loess with different fly ash contents show an increasing and decreasing tendency, respectively. The optimum fly ash content is suggested as 20%-25% after considering the seismic performance of fly ash-improved saturated loess and the economic cost of ground improvement. Based on the regression analysis, the empirical formulas of dynamic elastic modulus attenuation and damping ratio growth of improved saturated loess and their fitting parameters are given. |
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| Keywords: | flyash loess dynamic elastic modulus-damping ratio test dynamic stress-strain relationship dynamic characteristic parameter model |
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