岩土力学2012，Vol.33Issue(6)：1631-1639,9.
压实度和含水率对压实黏性土动态力学性能的影响试验研究
Experimental study of dynamic properties of compacted clay under different compaction degrees and water contents
摘要
Abstract
In order to investigate compression mechanical properties with strain rates varying from 600 s ' to 2 500 s ' 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.关键词
压实度/含水率/动态力学/应变率/比能量吸收Key words
compaction degree/ water content/ dynamics/ strain rate/ specific energy absorptions分类
建筑与水利引用本文复制引用
刘俊新,陈忠富,徐伟芳,陈刚..压实度和含水率对压实黏性土动态力学性能的影响试验研究[J].岩土力学,2012,33(6):1631-1639,9.基金项目
国防973项目(No.61392) （No.61392）
国家青年科学基金(No.11002134,No.11102195). （No.11002134,No.11102195）
