發(fā)布時(shí)間：2018-12-11 19:50

【摘要】：近年來(lái),我國(guó)的道路塌陷事故愈演愈烈,給人民的生命財(cái)產(chǎn)安全造成了極大危害。因此,亟待對(duì)道路路基下空洞進(jìn)行檢測(cè),提前發(fā)現(xiàn)進(jìn)行治理。由于探地雷達(dá)具有高效、無(wú)損、分辨率高的特點(diǎn),且道路結(jié)構(gòu)層及土基和下方潛伏的充氣空洞以及充水空洞之間的介電常數(shù)差異大,因此探地雷達(dá)技術(shù)十分適合道路空洞的檢測(cè)。但是實(shí)際應(yīng)用過程中,由于缺乏探地雷達(dá)異常圖像評(píng)判客觀標(biāo)準(zhǔn),且雷達(dá)資料解釋具有多解性和主觀經(jīng)驗(yàn)性,導(dǎo)致探地雷達(dá)技術(shù)在道路地下空洞中的應(yīng)用難以獲得理想效果。因此利用計(jì)算機(jī)開展空洞正演模擬研究,研究各種典型空洞模型的電磁波傳播、成像規(guī)律,這對(duì)于認(rèn)識(shí)探地雷達(dá)實(shí)測(cè)結(jié)果,識(shí)別空洞目標(biāo)體具有實(shí)際意義。本文通過建立道路路基下充氣與充水空洞模型,基于時(shí)域有限差分法,用GprMax及Matlab編程實(shí)現(xiàn)道路空洞正演模擬,對(duì)空洞模型正演模擬結(jié)果的雷達(dá)波圖像特征進(jìn)行分析。主要內(nèi)容如下:(1)針對(duì)道路空洞形成特點(diǎn),將道路空洞分為充氣型空洞和充水型空洞,分別進(jìn)行正演模擬分析,得出判別兩種類型空洞的理論依據(jù)。(2)針對(duì)不同形狀、不同深度、不同大小、不同激勵(lì)源類型、不同激勵(lì)源中心頻率、不同介電常數(shù)及電導(dǎo)率條件下進(jìn)行正演模擬分析,分析不同條件下的雷達(dá)波成像特點(diǎn),電磁波傳播規(guī)律。(3)最后運(yùn)用無(wú)線探地雷達(dá)進(jìn)行空洞實(shí)測(cè)實(shí)例與正演模擬對(duì)比,驗(yàn)證正演模擬的有效性。本文正演模擬結(jié)果有助于對(duì)實(shí)際探測(cè)目標(biāo)體識(shí)別和雷達(dá)成像資料的解釋,為探地雷達(dá)在路基空洞檢測(cè)應(yīng)用積累理論經(jīng)驗(yàn)。
[Abstract]:In recent years, road collapse accidents in our country become more and more serious, causing great harm to the safety of people's life and property. Therefore, it is urgent to detect the cavities under the roadbed and to find them in advance. Because GPR has the characteristics of high efficiency, nondestructive, high resolution, and the difference of dielectric constant between the road structure layer, the latent aeration cavity and the water filled cavity in the road structure layer and the underlying soil foundation, Therefore, the GPR technology is very suitable for the detection of road voids. However, in the practical application, due to the lack of objective criteria for the evaluation of ground penetrating radar abnormal images and the multi-solution and subjective experience in the interpretation of radar data, it is difficult to obtain ideal results in the application of ground penetrating radar technology in the underground cavity of the road. Therefore, it is of practical significance to study the electromagnetic wave propagation and imaging law of various typical cavity models by using computer to study the forward simulation of voids, which is of practical significance for recognizing the measured results of ground penetrating radar and identifying the cavity objects. Based on the finite difference time-domain (FDTD) method, the forward simulation of road cavitation is realized by using GprMax and Matlab, and the radar wave image features of the forward simulation result of the cavitation model are analyzed. The main contents are as follows: (1) according to the characteristics of road cavity formation, the road cavity is divided into inflatable cavity and water-filled cavity, and the forward simulation analysis is carried out respectively, and the theoretical basis for distinguishing the two types of voids is obtained. (2) aiming at different shapes, The forward simulation analysis of different depth, different size, different excitation source type, different excitation source center frequency, different dielectric constant and electrical conductivity is carried out, and the characteristics of radar wave imaging under different conditions are analyzed. (3) finally, the effectiveness of forward simulation is verified by using wireless ground penetrating radar (WGPR) to compare the actual cavity with the forward simulation. The results of forward modeling in this paper are helpful to the interpretation of actual target recognition and radar imaging data, and accumulate theoretical experience for the application of ground penetrating radar in subgrade cavity detection.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.1

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本文編號(hào)：2373125