【摘要】 <正> 声波探测法已广泛应用于岩体力学研究和地质勘测等方面,它较其它物探方法具有简单、迅速、工作量小,经济等优点,其探测结果也是可靠的。国内外都开始采用声波法来检测冻土的性质、土壤的冻结速度、和冻土的厚度等。 北京煤炭研究院、东北工学院、安徽煤炭科研所,淮南煤炭科研所,淮南特殊凿井公司等单位共同组成的科研组,从1978年开始进行了声波法检测冻结壁的研究工作。为了正确运更多还原

【Abstract】 This paper summarizes the theory, technique and process of measuring the sound velocities of undisturbed frozen soils, and shows a mathematical analysis of the measured results. The correlation between longitudinal wave velocity and temperature is obtained under free condition.The longitudinal wave velocities of two kinds of soil, i. e. middle- sand and, gravel-sand, are measured in both decreasing and increasing temperature. They increase with temperature decrease, and generally , increase evidently within the temperature rang from 0 to -10℃, and increase slowly as the temperature being lowered under-10℃. The sound velocity in gravel-sand is larger than that in middle-sand, the longitudinal wave velocity in the process of temperature decrease is larger than that in temperature increase when temperature is same, and that under loaded condition is larger than that under free conditron.更多还原