冻土动态力学性能的实验研究

Experimental Research of Dynamic Mechanical Behaviors of Frozen soil

摘要

摘要:利用分离式霍布金森压杆(SHPB)对4种低温下的冻土进行了4种高应变率的动态压缩实验. 实验结果表明：冻土不仅具有温度效应，还具有应变率效应，两种效应反映出冻土材料的时温等效性. 另外这种时温等效性在分析冻土材料的破坏过程时还体现在它的冻脆性和动脆性. 冻土材料动态应力应变曲线的汇聚现象和振荡现象均起源于这种冻脆性和动脆性.

Abstract:Frozen soil samples at 4 different temperatures were investigated in 4 different high strain rates on Split Hopkinson Pressure Bar (SHPB). The test results indicated that temperature and strain rate each have an effect on floating stress, this shows the time-temperature equivalence property of frozen soil. And the time-temperature equivalence property also show its dynamic brittleness and frozen brittleness. The oscillation and convergence of strain-stress curves are also aroused by its time-temperature equivalence property.