人工冻土纵波波速与温度和含水率的关系

用SYC-2型超声波测试仪和20 kHz超声换能器实测了不同温度和不同含水率下冻结粉质粘土的纵波波速，对实验数据进行了分析。结果表明，含水率一定时，总的趋势是，冻结粉质粘土纵波波速随冻结温度的增加而增加，但局部有变化,-7℃是冻结粉质粘土波速增长的拐点，-20℃ 是冻结粉质粘土波速快速增长的拐点；冻结温度一定时，其纵波波速和冻土强度随含水率的增加有下降的趋势，含水率20%是纵波波速变化的拐点, 含水率大于24%时，纵波波速增长趋于平缓。

A Test Research on Longitudinal Wave Velocity of Artificial Frozen Clay Under Different Temperature and Moisture Conditions

Using SYC-2 type supersonic wave test instrument and 20 kHz energy transducer, the authors are able to measure the longitudinal wave velocity of frozen silty clay under different temperature and moisture conditions. Experiment results show that the velocity increases as frozen temperature decreasing in general when moisture is kept constant. The velocity temperature curve has two turning points, which appear at -7℃ and 20℃ , respectively. The former indicates the velocity increasing and the latter is the indication of a faster velocity increasing. Fixing the frozen temperature, the velocity and strength of the frozen clay show a decreasing trend as moisture increasing. 20% moisture is the velocity changing turning point. When the moisture content is larger than 24% , the wave velocity increases gently.