【摘要】：城市地下工程建設(shè)必須對(duì)地下管線進(jìn)行準(zhǔn)確的定位,但目前多種探測(cè)方法精度均不高,因此,對(duì)影響探測(cè)精度的因素進(jìn)行深入地分析研究具有理論和實(shí)踐意義。以地下管線為研究對(duì)象,運(yùn)用探地雷達(dá)模擬軟件GprMax結(jié)合MATLAB語(yǔ)言,針對(duì)各向同性均勻介質(zhì)的探測(cè)體進(jìn)行了建模,分析了不同參數(shù)對(duì)管線探測(cè)效果的影響。建立了復(fù)雜條件下的探測(cè)體層狀模型,通過(guò)改變天線頻率研究了中低頻天線對(duì)分辨率、探測(cè)深度以及管徑、管線材質(zhì)的影響,結(jié)果表明50~600MHz頻率的天線能探測(cè)到埋深1 m條件下40 mm的金屬管,并可以根據(jù)管線剖面圖判斷出管徑大小和充填物質(zhì)。分別建立了復(fù)雜層狀條件下近間距、非金屬地下管線探測(cè)的模型,根據(jù)金屬管線和非金屬管線雷達(dá)反射波圖像的不同判斷管線材質(zhì)。針對(duì)非目標(biāo)體、填土不密實(shí)和地下水等干擾因素進(jìn)行了模擬研究,結(jié)果表明地下水含量對(duì)探測(cè)結(jié)果影響較大,現(xiàn)場(chǎng)探測(cè)應(yīng)最大限度的排除干擾,以提高探測(cè)的準(zhǔn)確度。針對(duì)某地下工程管線探測(cè),利用先進(jìn)的探地雷達(dá)技術(shù),采用Gpr Max軟件進(jìn)行了模擬,模擬結(jié)果與實(shí)測(cè)結(jié)果一致。理論和實(shí)踐證明,論文所采用的探測(cè)方法和圖像解譯手段能清晰的反映目標(biāo)體的特征,準(zhǔn)確定位管線。
[Abstract]:It is necessary to locate the underground pipeline accurately in the construction of urban underground engineering, but the accuracy of many detection methods is not high at present. Therefore, it is of theoretical and practical significance to deeply analyze and study the factors that affect the detection accuracy. Taking underground pipeline as research object, using GPR simulation software GprMax and MATLAB language, the model of isotropic and homogeneous medium is modeled, and the influence of different parameters on pipeline detection effect is analyzed. By changing the antenna frequency, the effects of the medium-low frequency antenna on the resolution, detection depth, pipe diameter and pipeline material are studied. The results show that the antenna with a frequency of 50 ~ 600MHz can detect 40 mm metal pipes at a depth of 1 m, and can be used to determine the diameter of the pipes and the filling materials according to the pipeline profiles. The detection models of near-spaced and non-metallic underground pipelines under complex stratified conditions are established respectively. The pipeline materials are judged according to the radar reflection wave images of metal pipelines and non-metal pipelines. In this paper, the interference factors, such as non-target body, uncompacted fill and groundwater, are simulated. The results show that the groundwater content has a great influence on the detection results, and the on-site detection should exclude the interference to the greatest extent in order to improve the accuracy of detection. Based on the advanced ground penetrating radar (GPR) technology, the GPR Max software is used to simulate the pipeline detection of an underground engineering. The simulation results are in agreement with the measured results. It is proved theoretically and practically that the detection method and image interpretation method used in this paper can clearly reflect the characteristics of the object and locate the pipeline accurately.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU990.3

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本文編號(hào)：2130224