广义S变换和Gabor反褶积在隧道地质超前预报信号处理中的应用研究

发布时间：2018-11-25 16:52

【摘要】：在隧道开挖过程中,掌子面前方的地质信息对隧道施工有着重要的作用,尤其在水文和地质条件比较复杂的区域进行隧道施工,经常会遇到溶洞、断层、破碎带等地质不良体。如果能在施工前掌握掌子面前方地质不良体的分布情况,采取相应的措施,就有可能避免突泥、涌水、塌方等工程事故的发生。因此在隧道施工过程中进行隧道地质超前预报显得十分重要。本文主要研究基于弹性波法的隧道地质超前预报技术中的信号处理技术,主要内容如下:(1)本文对傅立叶变换、离散卷积和离散相关的基本原理和数值算法进行详细的推导。(2)本文对S变换之间与小波变换和短时傅里叶变换之间的关系进行了详细的分析;同时对S变换与广义S变换的数值算法做了详细的说明;通过对比广义S变换、短时傅里叶变换和小波变换的频谱,说明广义S变换时频分辨率高,更加适合于地震资料的数据处理。(3)本文对最小平方反褶积和Gabor反褶积的基本理论和数值算法进行详细的推导,并说明了Gabor反褶积和平方反褶积之间的关系。(4)本文利用Gabor反褶积对F-K滤波后的数据的压缩,提高信号纵向高分辨率,并通过工程实例来说明了方法的有效性。
[Abstract]:In the process of tunnel excavation, the geological information in front of the face plays an important role in the tunnel construction, especially in the area with complicated hydrological and geological conditions. If we can grasp the distribution of geological bad bodies in front of the face before construction and take corresponding measures, it is possible to avoid the occurrence of engineering accidents such as mud outburst, water gushing, collapse and so on. Therefore, it is very important to forecast the tunnel geology in the process of tunnel construction. This paper mainly studies the signal processing technology of tunnel geological advance prediction technology based on elastic wave method. The main contents are as follows: (1) in this paper, Fourier transform, The basic principles and numerical algorithms of discrete convolution and discrete correlation are derived in detail. (2) the relationship between S transform and wavelet transform and short time Fourier transform is analyzed in detail. At the same time, the numerical algorithms of S-transform and generalized S-transform are explained in detail. By comparing the spectrum of generalized S transform, short time Fourier transform and wavelet transform, it is shown that the generalized S transform has high time-frequency resolution. It is more suitable for data processing of seismic data. (3) in this paper, the basic theory and numerical algorithm of least square deconvolution and Gabor deconvolution are derived in detail. The relationship between Gabor deconvolution and square deconvolution is explained. (4) in this paper, Gabor deconvolution is used to compress the F-K filtered data to improve the longitudinal high resolution of the signal, and an engineering example is given to illustrate the effectiveness of the method.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U452.11

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