CAJ | 학술논문

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渡的影响.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.
초성파재개질중적전파속도반영료개질적물리역학성질.본문운용보통종파환능기측정료불동함수솔적동결분질점토재불동온도하적종파화표면파속도,종이측정병계산동토적동탄성모량화박송비.기중표면파속도채용적시일충용접수파파봉상관산점회귀래계산적신방안,능구유효배제변계화저면반사도적영향.시험화계산결과표명:동결분질점토적박송비수온도승고화함수솔증가이증대;동탄성모량재시험함수솔적범위내수함수솔적증대이감소.
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.