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本文介绍了用液浸式超声波循环法测定冻土中超声波速度的原理和过程 ,并在 - 0 .2℃～ - 1 0℃温度范围内测定了含有不同比例废弃轮胎碎屑的Tomakomai粉土的纵、横波速度。结果表明超声波在冻土中的纵、横波传播速度在冻土温度接近 0℃时随温度的升高而急剧降低。结合冻土的未冻水含量随温度的变化规律分析表明 ,冻土中超声波的传播速度与冻土未冻水含量呈良好的线形关系 ,且未冻水含量每增加 1 % ,纵波速度约降低 6 2m/s;横波速度降低约 35m/s。
In this paper, the principle and process of measuring the ultrasonic velocity in permafrost by liquid immersion ultrasonic cycle method are introduced. Tomakomai silt containing different proportions of discarded waste tires is measured in the temperature range of -0.2 ℃ ~ -100 ℃. Longitudinal and transverse wave velocity. The results show that the longitudinal and transverse wave propagation velocity of ultrasonic in frozen soil decreases sharply with the increase of temperature when the permafrost temperature approaches 0 ℃. The results show that the propagation velocity of ultrasonic wave in frozen soil shows a good linear relationship with the unfrozen water content of frozen soil. When the un-frozen water content increases by 1%, the longitudinal wave velocity decreases 6 2m / s; S-wave velocity decreases about 35m / s.