| 豫东平原粉质黏土动剪切模量与阻尼比试验研究 |
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| 引用本文： | 宋前进,程磊,贺为民.豫东平原粉质黏土动剪切模量与阻尼比试验研究[J].西北地震学报,2020,42(4):1013-1018. |
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| 作者姓名： | 宋前进 程磊 贺为民 |
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| 作者单位： | 中国地质大学(北京)工程技术学院, 北京 100083;河南财经政法大学工程管理与房地产学院, 河南 郑州 450046;中国地震局地球物理勘探中心, 河南 郑州 450002 |
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| 基金项目： | 中国地震局地震科技星火计划项目（XH15058） |
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| 摘 要： | 粉质黏土动剪切模量和阻尼比是建筑场地动力稳定性评价的重要动力参数。为分析豫东平原粉质黏土的动力特性,利用双向振动三轴仪试验系统,对取自豫东平原地区的粉质黏土进行动三轴试验,研究粉质黏土状态及固结压力对动剪切模量和阻尼比的影响。研究发现:可塑粉质黏土(PSC)与软塑粉质黏土(SSC)的动力特性存在相近的变化趋势,动剪切模量比随剪应变的增大而减小,阻尼比随剪应变的增大而增大;在同一应变水平下,SSC的动剪切模量比随固结压力的增大而增大、PSC的阻尼比随固结压力的增大而增大;在相同试验条件下,PSC的最大动剪切模量大于SSC的最大动剪切模量;在剪应变小于0.01%时两者动剪切模量快速衰减,剪应变达到0.03%时两者动剪切模量趋于一致。根据现有的粉质黏土动剪切模量与阻尼比研究成果,结合试验数据,提出粉质黏土动剪切模量比、阻尼比随剪应变变化的数学模型,为豫东平原粉质黏土场地工程建设中的动力稳定性评价提供依据。
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| 关 键 词： | 粉质黏土 动三轴试验 动剪切模量 阻尼比 |
| 收稿时间： | 2019/4/12 0:00:00 |
Experimental Study of the Dynamic Shear Modulus and Damping Ratio of Silty Clay on Eastern Henan Plain |
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| SONG Qianjin,CHENG Lei,HE Weimin.Experimental Study of the Dynamic Shear Modulus and Damping Ratio of Silty Clay on Eastern Henan Plain[J].Northwestern Seismological Journal,2020,42(4):1013-1018. |
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| Authors: | SONG Qianjin CHENG Lei HE Weimin |
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| Institution: | School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;School of Engineering Management and Real Estate, Henan University of Economics and Law, Zhengzhou 450046, Henan, China; Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, Henan, China |
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| Abstract: | The dynamic shear modulus and damping ratio of silty clay are important parameters for evaluating the dynamic stability of building sites on the Eastern Henan Plain. To analyze the dynamic characteristics of silty clay on the Eastern Henan Plain, we conducted a dynamic triaxial test of the silty clay using a bidirectional-vibration triaxial test system. We also studied the influence of the state and consolidation pressure of silty clay on its dynamic shear modulus and damping ratio. The results indicate that the changes in the dynamic characteristics of plasticized silty clay (PSC) and soft plastic silty clay (SSC) are similar, with increases in shear strain, their dynamic shear modulus ratios decrease, and the damping ratios increase. Under the same strain, the dynamic shear modulus ratio of SSC and the damping ratio of PSC increase with increases in the consolidation pressure. Under the same test conditions, the maximum dynamic shear modulus of PSC was found to be greater than that of SSC. The dynamic shear moduli of PSC and SSC decrease rapidly when the shear strain is less than 0.01%, and tend to be consistent with each other when the shear strain reaches 0.03%. According to existing research on the dynamic shear modulus and damping ratio of silty clay, combined with experimental data, we propose a mathematical model for the dynamic shear modulus ratio and damping ratio of silty clay with shear strain. The results of this study provide a basis for evaluations of dynamic stability at silty-clay construction sites on the Eastern Henan Plain. |
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| Keywords: | silty clay dynamic triaxial test dynamic shear modulus damping ratio |
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