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士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.
Frozen soil samples were investigated at strain rates up to 1 450（1/s） and temperatures down to -20℃ by using the split Hopkinson pressure bar （SHPB）. The results showed that frozen soil exhibits temperature effect, strain rate effect, dynamic brittle and frozen brittle behavior. The temperature and strain rate effects indicate it＇s time-temperature equivalent property. Both oscillation and convergence of strain-stress curves are induced by its time-temperature equivalent property.
出处
《力学学报》
EI
CSCD
北大核心
2005年第6期724-728,共5页
Chinese Journal of Theoretical and Applied Mechanics
关键词
冻土
动态力学性能
SHPB
应变率效应
温度效应
时温等效性
frozen soil, dynamic mechanical behaviors, SHPB, strain rate effect, temperature effect, timetemperature equivalent property
