冻结重塑黄土单轴加载过程中声波传播特性试验研究

黄星; 李东庆; 明锋; 张宇; 邴慧

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 English Version

黄星^{1, 2, 3},
李东庆¹,
明锋¹,
张宇^{1, 2},
邴慧¹

1. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州 730000;
2. 中国科学院大学,北京 100049;
3. 四川农业大学建筑与城乡规划学院,四川都江堰 611830)

基金项目: 国家自然科学基金项目（41271080,41371090）; 中国科学院西部行动计划项目(KZCX2-XB3-19); 国家重点基础研究发展计划

详细信息

作者简介:
黄星(1988- ),女,汉族,四川雅安人,博士研究生,主要从事冻土超声波参数与冻土物理力学性质试验研究。E-mail: hxcas7@163.com。

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出版历程
- 收稿日期: 2014-11-16
- 发布日期: 2015-09-17

Experimental study on acoustic wave propagation properties of frozen remolded loess during uniaxial loading process

HUANG Xing^{1, 2, 3},
LI Dong-qing¹,
MING Feng¹,
ZHANG Yu^{1, 2},
BING Hui¹

1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. College of Architecture and Urban-Rural Planning, Sichuan Agricultural University, Dujiangyan 611830, China

摘要

摘要: 利用RSM-SY5(T)型非金属声波检测仪对冻结重塑黄土进行单轴加载条件下的超声波纵波透射试验,研究声波在冻结重塑黄土受压过程中传播的速度特征,同时利用短时傅里叶变换及小波分析研究声波在冻结重塑黄土中传播的波形、频谱等特征。结果表明：冻结重塑黄土的纵波波速受温度和外荷载的影响,波速随温度升高而降低,在加载过程中随应变的增大大致呈现先增加后减小的趋势;冻结重塑黄土的单轴抗压强度与初始纵波波速值之间满足指数关系,相关性很好;随着加载的进行频谱形状发生变化,谱面积和主频减小;加载初期尾波不发育,随着应力的增大、裂纹的产生尾波逐渐发育;声波的特征参数能在一定程度上反映冻结重塑黄土加载过程中内部裂纹的发展情况。
- 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
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.
- frozen remolded loess /
- uniaxial loading /
- temperature /
- P-wave velocity /
- short-time Fourier transform /
- wavelet transform

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