JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2014, Vol. 44 ›› Issue (5): 35-41.doi: 10.6040/j.issn.1672-3961.0.2013.345

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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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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

CLC Number: 

  • TU411
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