›› 2012, Vol. 33 ›› Issue (6): 1631-1639.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of dynamic properties of compacted clay under different compaction degrees and water contents

LIU Jun-xin1, 2，CHEN Zhong-fu2，XU Wei-fang2，CHEN Gang2   

  1. 1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China） 2. Institute of Structural Engineering, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
  • Received:2011-11-04 Online:2012-06-11 Published:2012-06-14

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Abstract: In order to investigate compression mechanical properties with strain rates varying from 600 s－1 to 2 500 s－1 on compacted clays under different compaction degrees and water contents，the specimens are subjected to axial impact with different projectile speeds by using the split Hopkinson pressure bar(SHPB) of 25 mm in diameter made by polycarbonate and a small pellet of vacuum seal cement as pulse shaper; and the validity of experiment is discussed considering the stress equilibrium and constant strain rate. The related curves of stress and strain, the relationship between dynamic stress and strain at peak with strain rates, the relationship between dynamic stress increase factor and strain increase factor at peak with strain rates, and what’more, the relationship between specific energy absorption and strain rates are also analyzed. Experimental results show that the dynamic peak stress, peak strain and specific energy absorption increase with the increase of strain rate; but the compaction degrees and the water contents have no influence on them; compaction degrees and water contents have a greater influence on dynamic stress increase factor and strain increase factor at peak; specific energy absorptions are dependent on strain rates; and the strain rate effect can be expressed by exponential approximations.

Key words: compaction degree, water content, dynamics, strain rate, specific energy absorptions

CLC Number: 

  • TU 45
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