超声纵波测量冻土动弹性模量的试验研究

超声波在介质中的传播速度反映了介质的物理力学性质。本文运用普通纵波换能器测定了不同含水率的冻结粉质粘土在不同温度下的纵波和表面波速度，从而测定并计算冻土的动弹性模量和泊松比。其中表面波速度采用的是一种用接收波波峰相关散点回归来计算的新方案，能够有效排除边界和底面反射波的影响。试验和计算结果表明：冻结粉质粘土的泊松比随温度升高和含水率增加而增大；动弹性模量在试验含水率的范围内随含水率的增大而减小。

Experimental study of ultrasonic longitudinal wave measuring dynamic elastic modulus of frozen soil

Ultrasonic wave velocity traveling in media reflects the physico-mechanical properties of the media. In this paper, velocities of the ultrasonic waves and the surface waves in frozen chy soil with different water contents are mea-sured at different tempertures by the common longitudinal wave transducer.Then,the dynamic elastic modulus and Pois-son's ratios of the frozen soils tested were calculated .The new method of receiving power points related to wave peak was used to calculate the velocity of surface wave.This method can exclude effectively the influence of the boundory and bottom surface reflection waves. According to results of tests and calculations,the Poisson's ratios of th frozen clay soil increase with increasing water content and temperture;the dynamic elastic modulus decrease with increasing water content in the wide range of water contents tested.