探地雷達目標(biāo)識別方法及其在隧道襯砌檢測中的應(yīng)用研究
[Abstract]:With the continuous improvement and development of highway trunk network in China, the scale and number of highway tunnels are also increasing. In order to avoid accidents in the process of tunnel excavation and after completion and affect the safety of people's lives and property, it is necessary to use appropriate geophysical tools to detect the quality of tunnel lining. Ground penetrating radar (GPR) is favored by tunnel workers because of its advantages of fast, high efficiency, high resolution and no damage. For the three typical diseases of lining emptiness, indense solid and empty water filling in lining detection, they can be classified into voids of different sizes and shapes and filled with different substances. In this paper, the experimental data are obtained by using ground penetrating radar (GPR) to detect the physical model, and the classification and identification method of different filling materials of voids is established, and then this method is applied to the disease classification and identification of tunnel lining. The main research contents are as follows: (1) the initial radar data of dry sand, gravel, mud, water and other substances filled with voids are obtained respectively through the physical model test. The data preprocessing process of ground penetrating radar (GPR) summarized in this paper is used to process GPR data. In order to further summarize and analyze the typical radar images of three kinds of diseases such as empty lining, undense entity and empty water in tunnel lining detection. (2) three attribute extraction techniques of GPR amplitude, spectrum and coherence are introduced. combined with the physical meaning of radar attribute, root mean square amplitude, average wave peak amplitude and time domain average energy are selected. Five radar attributes of similarity coefficient and average phase of-3dB bandwidth are used as characteristic parameters of target classification and recognition of ground penetrating radar (GPR). (3) five radar attributes, root mean square amplitude, average peak amplitude, average energy in time domain, similarity coefficient and average phase of-3dB bandwidth, are used as vector inputs by establishing machine learning binary classification (GPC) model for different fillers of voids. The four substances filled with air, gravel, mud and water in each cavity of the physical model are successfully identified, and the corresponding prediction probabilities are given. (4) the GPC prediction model verified by the physical model test is applied to the actual lining detection project of Cengxi tunnel, and the three lining diseases of emptiness, indense entity and empty water filling are successfully classified and identified. It is shown that the Gaussian prediction model for GPR tunnel lining detection proposed in this paper is feasible and has a good application prospect.
【學(xué)位授予單位】:廣西大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U455.91
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