| 确定砂土动剪切模量和阻尼比的方法对比 |
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| 引用本文： | 宋东松,冯震,金红山,孙逸涵.确定砂土动剪切模量和阻尼比的方法对比[J].吉林大学学报(地球科学版),2021,51(5):1366-1380. |
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| 作者姓名： | 宋东松 冯震 金红山 孙逸涵 |
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| 作者单位： | 1. 河北大学河北省土木工程监测与评估技术创新中心, 河北 保定 071002;2. 河北大学建筑工程学院, 河北 保定 071002;3. 91144部队, 辽宁 大连 116041 |
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| 基金项目： | 中国地震局工程力学研究所基本科研业务费专项资助项目（2019EEEVL0202）；河北省自然科学基金项目（E2020201017，E2019201422） |
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| 摘 要： | 确定土体动剪切模量的常用方法有规范法、Kumar法和自相关函数法，确定相应阻尼比的方法有规范法、Das and Luo法、Kokusho法、Kumar法和互相关函数法，为了分析不同方法所产生差异，实现定量化对比分析，笔者以福建标准砂（粒径为0.5~1.0 mm）为研究对象，采用不排水的应力控制动三轴试验，探讨不同的确定土体动剪切模量和阻尼比方法的差异性，并给出了不同土体条件建议选用的方法。结果表明：1）3种方法确定动剪切模量的结果有一定的差异，随剪应变的增大结果的差异逐渐增大，有效围压对结果的差异性有所影响，当剪应变为4×10-3，有效围压为100 kPa时，3种方法差异显著，相对误差最大接近20%；2）而5种方法确定阻尼比的结果差异显著，随着剪应变的增大，5种方法确定的阻尼比相对误差大体上均在迅速减小，只有规范法在有效围压为100 kPa时，其相对误差有较小的增大趋势；5种方法中，Kumar法确定的阻尼比最接近平均阻尼比，互相关函数法远高于平均阻尼比，Das and Luo法和Kokusho法确定的阻尼比基本一致但低于平均阻尼比。建议以后的工程应用中，加载方式为应力控制时，可采用自相关函数法确定动剪切模量，采用Kumar法确定阻尼比，二者确定的动剪切模量和阻尼比均最接近平均值。
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| 关 键 词： | 规范法 Kumar法 自相关函数法 Das and Luo法 Kokusho法 互相关函数法 动剪切模量 阻尼比 砂土 |
| 收稿时间： | 2020-12-21 |
Comparison of Methods for Determining Sand Dynamic Shear Modulus and Damping Ratio |
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| Song Dongsong,Feng Zhen,Jin Hongshan,Sun Yihan.Comparison of Methods for Determining Sand Dynamic Shear Modulus and Damping Ratio[J].Journal of Jilin Unviersity:Earth Science Edition,2021,51(5):1366-1380. |
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| Authors: | Song Dongsong Feng Zhen Jin Hongshan Sun Yihan |
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| Institution: | 1. Hebei Civil Engineering Monitoring and Evaluation Technology Innovation Center, Hebei University, Baoding 071002, Hebei, China;2. College of Civil Engineering and Architecture, Hebei University, Baoding 071002, Hebei, China;3. 91144 Troops, Dalian 116041, Liaoning, China |
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| Abstract: | At present, the commonly used methods to determine the dynamic shear modulus of soil include the standard method, the Kumar method and the autocorrelation function method. The methods to determine the corresponding damping ratio include the standard method, the Das and Luo method, the Kokusho method, the Kumar method, and the cross-correlation function method. So far, the understanding of the differences caused by the different methods is not deep enough, and there is a lack of quantitative comparative analysis. In this study, the Fujian standard sand (particle size 0.5-1.0 mm) was used as the research object, and the undrained stress-controlled dynamic triaxial test was used to discuss the differences of the different methods so as to determine the dynamic shear modulus and damping ratio of the sand, and then to recommend the method to use. The results show that:1) The dynamic shear modulus determined by the three methods has a certain difference. The difference gradually increases with the increase of the shear strain, but the difference decreases with the increase of the effective confining pressure. When the shear strain is 4×10-3 and the effective confining pressure is 100 kPa, the difference between the three methods is the most significant, and the maximum relative error is close to 20%. 2) The damping ratios of the five methods have significant differences. The relative errors of the five methods for determining the damping ratio decrease rapidly with the increase of the shear strain; When the effective confining pressure is 100 kPa, the damping ratio only by the standard method has a smaller increasing trend. Among them, the damping ratio determined by the Kumar method is closest to the average damping ratio, the damping ratio by the cross-correlation function method is much higher than the average damping ratio, and the damping ratio determined by the Das and Luo method and the Kokusho method is basically the same but lower than the average damping ratio. So, it is recommended that in future engineering applications, when the loading method is stress control, the correlation function method can be used to determine the dynamic shear modulus and the Kumar method to determine the damping ratio. |
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| Keywords: | standard method Kumar method autocorrelation function method Das and Luo method Kokusho method cross-correlation function method dynamic shear modulus damping ratio sand |
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