| 崔文杰,滕鹏晓,韩宝坤.土质滑坡临滑前次声信号特征研究[J].声学技术,2018,37(2):157~162 |
| 土质滑坡临滑前次声信号特征研究 |
| Characteristics of infrasound signals just before landslide |
| 投稿时间：2017-04-23 修订日期：2017-06-30 |
| DOI：10.16300/j.cnki.1000-3630.2018.02.011 |
| 中文关键词: 土质滑坡 次声 时频分析 能量特性 |
| 英文关键词: earthiness landslide infrasound time-frequency analysis energy feature |
| 基金项目: |
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| 中文摘要: |
| 土质滑坡临滑前，土壤内部颗粒的错动、摩擦和土体裂纹的扩展会产生次声波。为了明确土质滑坡临滑前次声信号的特性，对土质坡体模型进行了6组滑坡模拟实验，同时采集实验过程中产生的次声信号。利用短时傅里叶变换对采集的信号进行时频分析，然后利用小波分解法研究信号在各个频段上的能量特性。分析结果表明：土质滑坡临滑前有特殊的次声信号产生，信号的频率主要集中在0.5～6 Hz和12.5 Hz附近。根据土质滑坡蠕滑阶段的发展规律推断：0.5～6 Hz频段的次声信号为滑面处颗粒间错动、摩擦产生；频率在12.5 Hz附近的次声信号为滑体内部裂纹扩展产生。通过实验得到的次声特性可以作为土质滑坡次声监测的重要参考。 |
| 英文摘要: |
| The motion and friction of soil particles and the crack expansion in land will generate infrasound waves just before landslide.In order to analyze the characteristics of infrasound signals just before landslide,six groups of landslide simulation experiments are conducted with a soil slope model,and the generated infrasound signals in the experiments are acquired.The time-frequency characteristics of the signals are analyzed by using the short time Fourier transform and the energy features of the signals in each frequency band are studied by wavelet decomposition in this paper.The result shows that there are special infrasound signals generated before landslide,and the frequencies of the signals are mainly concentrated in 0.5~6 Hz and 12.5 Hz around.According to the development law of land slide creeping stage,the infrasound signals of 0.5~6 Hz are generated by the intermittent motion and friction of soil particles on the slip surface;and,the infrasound signal near 12.5 Hz is generated by the crack expansion of the sliding body.The infrasound characteristics obtained by the experiments can be used as an important reference for the infrasound monitoring of landslide. |
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