岩土工程学报2015，Vol.37Issue(9)：1660-1667,8.DOI:10.11779/CJGE201509013
冻结重塑黄土单轴加载过程中声波传播特性试验研究
Experimental study on acoustic wave propagation properties of frozen remolded loess during uniaxial loading process
摘要
Abstract
The ultrasonic P-wave tests on frozen remolded loess under uniaxial loading are conducted by using RSM-SY5(T) nonmetal ultrasonic test meter to study the velocity characters of P-wave. The characteristics of acoustic waveforms and wave frequency spectra of frozen remolded loess are investigated by using the short-time Fourier transform and wavelet transform. The experimental results indicate that the P-wave velocity is affected by the temperature and external loads, and the velocity decreases with the increase of temperature and generally increases at first and then decreases with strain during the loading process. There is an exponential relationship between the uniaxial compressive strength and the initial P-wave velocity, and the correlation between them is very good. With the increase of external loading, the shape of spectral curve will change and the spectral area and main frequency will decrease. The coda waves are not developed at the initiation of loading and gradually develop with the increase of stress and the emergence of cracks. The characteristic parameters of acoustic waves can reflect the development of internal cracks of frozen remolded loess during loading to some extent.关键词
冻结重塑黄土/单轴加载/温度/纵波波速/短时傅里叶变换/小波变换Key words
frozen remolded loess/uniaxial loading/temperature/P-wave velocity/short-time Fourier transform/wavelet transform分类
建筑与水利引用本文复制引用
黄星,李东庆,明锋,张宇,邴慧..冻结重塑黄土单轴加载过程中声波传播特性试验研究[J].岩土工程学报,2015,37(9):1660-1667,8.基金项目
国家自然科学基金项目(41271080,41371090) （41271080,41371090）
中国科学院西部行动计划项目(KZCX2-XB3-19) （KZCX2-XB3-19）
国家重点基础研究发展计划("973"计划)项目(2012CB026102) （"973"计划）
冻土工程国家重点实验室课题(SKLFSE-ZQ-35) （SKLFSE-ZQ-35）
