| 固原重塑黄土动力特性共振柱试验研究 |
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| 引用本文： | 安亮,邓津,郑志华,王平.固原重塑黄土动力特性共振柱试验研究[J].西北地震学报,2019,41(4):949-956. |
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| 作者姓名： | 安亮 邓津 郑志华 王平 |
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| 作者单位： | 中国地震局兰州地震研究所 黄土地震工程重点实验室, 甘肃 兰州 730000,中国地震局兰州地震研究所 黄土地震工程重点实验室, 甘肃 兰州 730000;甘肃省岩土防灾工程技术研究中心, 甘肃 兰州 730000,防灾科技学院, 河北 三河 065201,中国地震局兰州地震研究所 黄土地震工程重点实验室, 甘肃 兰州 730000;甘肃省岩土防灾工程技术研究中心, 甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金面上项目（51578518） |
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| 摘 要： | 利用GCTS共振柱测试仪研究了干密度和固结压力对固原黄土重塑土动剪切模量和阻尼比的影响及试验数据误差的基本规律。通过设计不同工况的试验条件,对比分析结果表明:相同含水率条件下,最大动剪切模量G_(dmax)随固结压力和干密度的增大而增大。相同干密度条件下,黄土的动剪切模量比随围压的增大而增大;阻尼比随围压的增大而减小;相同围压条件下,黄土动剪切模量比随干密度的增大而增大,阻尼比随干密度的增大而减小;不同剪应变特征点的动剪切模量比和阻尼比试验数据呈现一定的离散性,且离散程度阻尼比明显高于动剪切模量比。研究成果可为该地区场地地震反应分析及工程建设提供基础资料。
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| 关 键 词： | 黄土 共振柱试验 固结压力 剪切模量 阻尼比 试验误差 |
| 收稿时间： | 2018/6/29 0:00:00 |
Resonance Column Tests on the Dynamic Characteristics of Remolded Loess in Guyuan |
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| AN Liang,DENG Jin,ZHENG Zhihua and WANG Ping.Resonance Column Tests on the Dynamic Characteristics of Remolded Loess in Guyuan[J].Northwestern Seismological Journal,2019,41(4):949-956. |
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| Authors: | AN Liang DENG Jin ZHENG Zhihua and WANG Ping |
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| Institution: | Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, Gansu, China,Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, Gansu, China;Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, Gansu, China,Institute of Disaster Prevention, Sanhe 065201, Hebei, China and Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, Gansu, China;Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, Gansu, China |
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| Abstract: | Dynamic shear modulus and damping ratio are important indicators in characterizing the mechanical properties of soil under the action of an earthquake. The influences of dry density and consolidation pressure on the dynamic shear modulus and damping ratio of remolded loess in Guyuan, and the basic rule of the error of test data were studied by the GCTS resonant column apparatus. The comparative analysis results under different test conditions indicated that the maximum dynamic shear modulus increases with increasing consolidation pressure and dry density under constant moisture content. Under the same dry density, the dynamic shear modulus ratio of loess increases and the damping ratio decreases with increasing confining pressure. Under the same confining pressure, the dynamic shear modulus ratio of loess increases and the damping ratio decreases with increasing dry density. The test data of dynamic shear modulus ratio and damping ratio of different shear strain points showed a certain discreteness, and the discrete degree of the damping ratio was obviously higher than that of the dynamic shear modulus ratio. The research results can provide basic information for local seismic response analysis and engineering construction. |
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| Keywords: | loess resonant column test consolidation pressure shear modulus damping ratio test error |
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