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山东大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (5): 35-41.doi: 10.6040/j.issn.1672-3961.0.2013.345

• 土木工程 • 上一篇    下一篇

非饱和土动剪模量与阻尼比影响因素试验

付昌1,2,3, 蒋明镜1,2,3, 申志福1,2,3, 王华宁4, 吴晓峰2,3   

  1. 1. 同济大学 土木工程防灾国家重点实验室, 上海 200092;
    2. 同济大学 地下建筑与工程系, 上海 200092;
    3. 同济大学 岩土及地下工程教育部重点实验室, 上海 200092;
    4. 同济大学 航空航天与力学学院, 上海 200092
  • 收稿日期:2013-11-19 修回日期:2014-09-24 发布日期:2013-11-19
  • 通讯作者: 蒋明镜(1965-), 男, 江苏如皋人, 教授, 博导, “同济大学特聘教授”, 主要研究方向为天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析.E-mail:mingjing.jiang@tongji.edu.cn E-mail:mingjing.jiang@tongji.edu.cn
  • 作者简介:付昌(1989-), 男, 河南新乡人, 硕士研究生, 主要研究方向为宏观微观土力学.E-mail:fuchang521@163.com
  • 基金资助:
    国家杰出青年科学基金资助项目(51025932);国家自然科学基金资助项目(51179128)

Experiments on influence factors of dynamic shear modulus and damping ratio of unsaturated soil

FU Chang1,2,3, JIANG Mingjing1,2,3, SHEN Zhifu1,2,3, WANG Huaning4, WU Xiaofeng2,3   

  1. 1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
    2. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;
    3.Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
    4. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
  • Received:2013-11-19 Revised:2014-09-24 Published:2013-11-19

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摘要： 为指导北京某航天着陆冲击试验床的快速铺设,借助DRNEVICH LONG-TOR型共振柱仪开展了若干组试验,研究了含水率、干密度、围压对动剪切模量与阻尼比的影响。试验结果表明:含水率较小时,动剪切模量随含水率增大而增大,而阻尼比无明显变化;干密度增大,动剪切模量增大,阻尼比有减小的趋势;围压增大,动剪切模量增大,阻尼比有减小的趋势。对12组试验结果进行拟合表明,阻尼比与动剪切模量比之间存在很好的线性关系。同时,通过与前人研究对比表明,不同土体其动力特性不同,因此在着陆场地铺设前对土体动力特性进行研究很有必要。

关键词: 干密度, 粉土, 动剪切模量, 含水率, 阻尼比, 围压

Abstract: In order to guide the quick preparation of an experimental landing ground in Beijing, several resonant column tests were conducted on unsaturated soils sampled in-situ to study the effects of moisture content, dry density and confining pressure on dynamic shear modulus and damping ratio by using DRNEVICH LONG-TOR resonant column apparatus. The results showed that the dynamic shear modulus increased with moisture content increasing, while the damping ratio showed negligible correlation with moisture in low moisture content range. The dynamic shear modulus increased while the damping ratio tended to decrease due to either the increasing of dry density or confining pressure. The damping ratio and dynamic shear modulus ratio showed perfectly correlated linearity. The dynamic mechanical responses of different soil were different with different soil, and this was necessary to study the dynamic mechanical responses before landing ground preparation.

Key words: confining pressure, dynamic shear modulus, silty soil, damping ratio, moisture content, dry density

中图分类号: 

  • TU411
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