CAS-1模拟月壤动剪切模量与阻尼比的试验研究

›› 2014, Vol. 35 ›› Issue (1): 74-82.

CAS-1模拟月壤动剪切模量与阻尼比的试验研究

张宇，余飞，陈善雄，李剑

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071

收稿日期:2012-11-09 出版日期:2014-01-10 发布日期:2014-01-14
作者简介:张宇，男，1987年生，博士研究生，主要从事特殊土工程特性方面的研究工作

Experimental study of dynamic shear modulus and damping ratio of CAS-1 lunar soil simulant

ZHANG Yu，YU Fei，CHEN Shan-xiong，LI Jian

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2012-11-09 Online:2014-01-10 Published:2014-01-14

摘要/Abstract

摘要： 针对中国科学院地球化学研究所与国家天文台合作研制成功的CAS-1模拟月壤（国家标准试样），利用GDS共振柱试验仪对模拟月壤开展动力学参数的试验研究，分析了不同孔隙比、不同围压对动剪切模量G及剪应变的影响规律。试验结果表明，在应力水平很低、孔隙比较大的真实月面环境条件下，动剪切模量G较小，阻尼比较大，且随着动剪应变的增大，动剪切模量快速减小，阻尼比急剧增大。采用Hardin-Drnevich模型，得到了不同孔隙比、不同围压下归一化动剪模量G/Gmax与归一化阻尼比 / 随变化的平均拟合曲线，探讨了最大动剪切模量Gmax、最大阻尼比和参考剪应变等动参数与应力水平的相关关系式，并据此给出了月壤钻取采样深度（0～3 m）内Gmax、和的值域区间以及各剪应变对应的G/Gmax和的推荐值。

关键词: CAS-1模拟月壤, 动剪切模量, 阻尼比, 动剪切模量比, 共振柱试验, Hardin-Drnevich双曲线模型

Abstract: Through the dynamic tests on the CAS-1 lunar soil simulant (national standard sample) which is developed by the Institute of Geochemistry and the National Astronomical Observatories, Chinese Academy of Sciences with the GDS resonant column test instrument, the effect of the different void ratios and the different confining pressures on the dynamic shear modulus G and the damping ratio ? is analyzed. The test results show that, the dynamic shear modulus G is smaller as well as the damping ratio ? is larger, and dynamic shear modulus decreases rapidly as well as damping ratio increases sharply with the increase of shear strain in the real lunar surface environmental conditions with low stress level and large void ratio. By using the Hardin-Drnevich model, the average fitting curve of G/Gmax and ? /? max with the change of the dynamic shear strain ? under different void ratios and different confining pressures are obtained; and the correlation formulas between dynamic parameters of the maximum dynamic shear modulus Gmax, the maximum damping ratio ? max, the reference shear strain ? r and the stress level ? are discussed. Accordingly, the range intervals of Gmax, ? max, ? r within the drill sampling depth (0-3 m) of the lunar soil as well as the recommended values of G/Gmax and ? corresponding to each of the shear strain are presented.

Key words: CAS-1 lunar soil simulant , dynamic shear modulus, damping ratio, dynamic shear modulus ratio, resonant column test, Hardin-Drnevich hyperbolic model

中图分类号:

TU 411

张宇，余飞，陈善雄，李剑. CAS-1模拟月壤动剪切模量与阻尼比的试验研究[J]. , 2014, 35(1): 74-82.

ZHANG Yu，YU Fei，CHEN Shan-xiong，LI Jian. Experimental study of dynamic shear modulus and damping ratio of CAS-1 lunar soil simulant[J]. , 2014, 35(1): 74-82.

参考文献

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