本文選題：瀝青混合料　切入點(diǎn)：空隙　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近幾年來,瀝青混合料被廣泛地用在路面建設(shè)和維護(hù)中。瀝青混合料細(xì)觀結(jié)構(gòu)是評價(jià)其路用性能的主要依據(jù)。其中,混合料中空隙的形態(tài)及空間分布特征對其抗車轍性能、透水性等性質(zhì)有著十分重要的影響。本文從細(xì)觀角度出發(fā),以瀝青混合料試件的X-ray CT圖像為數(shù)據(jù)源、基于計(jì)算機(jī)圖形圖像技術(shù),對混合料中的空隙結(jié)構(gòu)進(jìn)行重建,并基于此統(tǒng)計(jì)與分析空隙結(jié)構(gòu)的形態(tài)及空間分布特征,為探尋混合料的宏觀力學(xué)行為與空隙結(jié)構(gòu)特征間的規(guī)律,以及進(jìn)一步構(gòu)建混合料三維細(xì)觀模型打下基礎(chǔ)。具體來說,本文的主要工作分為以下四個(gè)方面:1)基于計(jì)算機(jī)圖像處理技術(shù),開發(fā)混合料試件X-ray CT圖像中的空隙閉合輪廓自動(dòng)檢測算法及輪廓擬合算法;2)基于各圖層的空隙輪廓檢測結(jié)果,開發(fā)單個(gè)空隙與其在各圖層中輪廓的映射算法;3)完成單個(gè)空隙三維實(shí)體模型的重建,并基于計(jì)算機(jī)圖形技術(shù),進(jìn)一步獲得混合料試件中空隙結(jié)構(gòu)的三維實(shí)體模型;4)基于構(gòu)建的空隙結(jié)構(gòu)三維實(shí)體模型,統(tǒng)計(jì)并分析了混合料試件中的空隙形狀及空間分布特征。試驗(yàn)數(shù)據(jù)表明,相比傳統(tǒng)方法,本文提出的空隙信息識別算法的精度有較大的提升,能夠獲得空隙率、等效直徑和表面積等統(tǒng)計(jì)指標(biāo)的可靠結(jié)果,同時(shí),重構(gòu)出的空隙結(jié)構(gòu)三維實(shí)體模型具有完整的邊界信息,不僅能夠呈現(xiàn)空隙的真實(shí)形貌和空間分布,還能為后續(xù)的基于混合料三維細(xì)觀模型構(gòu)建的混合料細(xì)觀數(shù)值仿真提供支持。
[Abstract]:In recent years, asphalt mixture has been widely used in pavement construction and maintenance. In this paper, the X-ray CT image of asphalt mixture specimen is used as data source, and the void structure in the mixture is reconstructed based on computer graphics and image technology. Based on the statistics and analysis of the morphology and spatial distribution of the void structure, this paper lays a foundation for exploring the laws between the macroscopic mechanical behavior of the mixture and the characteristics of the void structure, and for further constructing the mixture three-dimensional meso-model. The main work of this paper is divided into the following four aspects: 1) based on the computer image processing technology, the automatic detection algorithm of the void closed contour and the contour fitting algorithm in the X-ray CT image of the mixture specimen are developed. The 3D solid model reconstruction of single void and its contour mapping algorithm in each layer is developed, and based on the computer graphics technology, the reconstruction of the 3D solid model of the single void is completed. Furthermore, the three-dimensional solid model of void structure in mixture specimen is obtained. Based on the three-dimensional solid model of void structure constructed, the void shape and spatial distribution in the mixture specimen are analyzed and analyzed. The experimental data show that, Compared with the traditional method, the accuracy of the voids information recognition algorithm proposed in this paper is greatly improved, and the reliable results of the statistical indexes such as void ratio, equivalent diameter and surface area can be obtained, at the same time, The reconstructed 3D solid model of void structure has complete boundary information, which can not only present the true morphology and spatial distribution of the void, but also provide support for the subsequent numerical simulation of the mixture based on the mixture three-dimensional mesoscopic model.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U414

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