| 黄土骨干曲线模型比较分析 |
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| 引用本文： | 廖红建,李涛,马宗源,刘健.黄土骨干曲线模型比较分析[J].岩土力学,2009,30(Z2):17-21. |
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| 作者姓名： | 廖红建 李涛 马宗源 刘健 |
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| 作者单位： | 1.三峡大学 三峡库区地质灾害教育部重点实验室，宜昌 443002；2.西安交通大学 土木工程系，西安 710049； 3.里尔中央理工大学 土木工程系，法国 59651 |
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| 基金项目： | 三峡库区地质灾害教育部重点实验室基金，国家自然科学基金资助项目 |
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| 摘 要： | 对饱和重塑黄土进行了一系列不同加载条件下的动三轴试验，研究了对每级荷载应用多个滞回圈构造骨干曲线的方法，该方法可以考虑更多的试验信息，减小试验随机性对模拟曲线的影响。并运用该方法对试验数据采用Hardin-Drnevich模型、修正Hardin-Drnevich模型和Martin-Darvidenkov模型3种不同的骨干曲线模型进行数值模拟，分析了不同的骨干曲线模型对试验数据模拟的准确性和参数敏感性。结果表明，在试验条件变化时Hardin-Drnevich模型并不能总是很好地模拟试验骨干曲线，而且在有些情况下偏离较多。修正Hardin-Drnevich模型和Martin-Darvidenkov模型相比于Hardin-Drnevich模型能更好地模拟试验数据。在对不规则动载下黄土动力反应的数值模拟中，可以考虑用修正Hardin-Drnevich模型和Martin-Darvidenkov模型模拟骨干曲线。考虑到Martin-Darvidenkov模型参数对试验数据相对敏感，因此，建议采用修正Hardin-Drnevich模型模拟骨干曲线。
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| 关 键 词： | 黄土 动三轴试验 累积残余应变 骨干曲线 |
| 收稿时间： | 2009-08-17 |
Comparative analysis of backbone curve models for loess soils |
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| LIAO Hong-jian,LI Tao,MA Zong-yuan,LIU Jian.Comparative analysis of backbone curve models for loess soils[J].Rock and Soil Mechanics,2009,30(Z2):17-21. |
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| Authors: | LIAO Hong-jian LI Tao MA Zong-yuan LIU Jian |
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| Institution: | 1.Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang, 443002, China; 2.Department of Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China; 3.Génie Civil, Ecole Centrale de Lille, 59651, France |
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| Abstract: | A series of dynamic triaxial tests were conducted on saturated remolded loess specimens under various loading conditions. A method of using hysteretic loops for each loading step to construct the backbone curve is developed. This method can utilize most of the testing information and reduce the randomicity of the tests compared with the traditional method of using only one hysteretic loop for each loading step. Hardin-Drnevich model, modified Hardin-Drnevich model and Martin-Darvidenkov model were then used to simulate the test results. Using this method, the accuracy and parameter sensibility of the above three backbone curve models were discussed respectively. Results show that Hardin-Drnevich Model can't always simulate test data accurately in different test conditions. Modified Hardin-Drnevich Model and Martin-Darvidenkov model are more effective to simulate test data and they can reflect the softening characteristics of the backbone curve. Considering that Martin-Darvidenkov model is more sensitive than modified Hardin-Drnevich model, modified Hardin-Drnevich model is suggested to be used in the dynamic simulation of loess under complex loads. |
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| Keywords: | loess dynamical triaxial test accumulated residual strain backbone curve |
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