本文選題：顆粒形狀 + 形狀參數(shù)　； 參考：《長江科學(xué)院》2015年碩士論文

【摘要】：多孔介質(zhì)是由固體構(gòu)成復(fù)雜孔隙系統(tǒng)的骨架,流體可以在其內(nèi)部連通的孔隙系統(tǒng)運動的物質(zhì)空間。最常見且為人們廣泛利用的多孔介質(zhì)固體材料為人工爆破碎石料或經(jīng)過長距離搬運的砂礫石,所以研究顆粒形狀對于多孔介質(zhì)孔隙系統(tǒng)和滲透特性的影響,具有重要實際意義。本文研究顆粒形狀的測量途徑和評價方法,采用影像測量儀和專門研制的夾具,利用5個形狀參數(shù)對三組粒徑的顆粒形狀進行測量和評定。通過利用CT機掃描獲取的掃描斷面圖,在不同開度閾值下統(tǒng)計分析了碎石料填筑試樣和玻璃球填筑試樣孔隙大小分布規(guī)律,以及孔隙形狀分形特征。通過碎石料和玻璃球填筑試樣的滲透試驗,初步分析探討了顆粒形狀對多孔介質(zhì)滲透特性的影響規(guī)律。本文的主要研究內(nèi)容和結(jié)論如下:(1)采用影像測量儀和專用夾具多角度量測碎石顆粒形狀,豐富了顆粒形狀測量信息,為更準確地評定顆粒形狀奠定了基礎(chǔ)。(2)采用5個形狀參數(shù)評定顆粒形狀。統(tǒng)計分析了三個粒徑組顆粒群的形狀參數(shù)分布規(guī)律,獲取顆粒形狀參數(shù)的分布特征,比較碎石顆粒與標準球體形狀的差異。通過形狀參數(shù)的對比,指出長寬比、扁平度和球形度能夠較敏感地反映顆粒偏離球體的程度,其中,相對于扁平度來說,長寬比、球形度的獲取更方便和直接,因而在可操作性和效率上更具優(yōu)勢。(3)利用CT機掃描獲取碎石料和玻璃球填筑試樣的斷面圖,發(fā)現(xiàn)其內(nèi)部的孔隙形態(tài)都很復(fù)雜,所選粒徑組試樣CT掃描二維圖像上顯示了較好的連通性。采用合適的孔隙開度閾值,可以在狹窄處斷開孔隙,以便開展孔隙大小統(tǒng)計分析和分形特征研究。(4)針對同一粒組同一粒徑分布的碎石顆粒和玻璃球填筑試樣,可以開展?jié)B透性對比試驗,初步結(jié)果表明,顆粒形狀越不規(guī)則,滲透系數(shù)越大。
[Abstract]:Porous media is a material space in which a complex porous system is composed of solids, in which fluid can move through a connected pore system. The most common and widely used solid material in porous media is artificial blasting gravel or sand gravel which is transported over long distances. So it is of great practical significance to study the influence of particle shape on pore system and permeability characteristics of porous media. In this paper, the measurement and evaluation methods of particle shape are studied. The shape of three groups of particle size is measured and evaluated by using the image measuring instrument and the specially developed fixture, using five shape parameters. The pore size distribution law and fractal characteristics of pore shape of gravel filled specimen and glass ball filled specimen were statistically analyzed under different opening threshold by using scanning sectional diagram obtained by CT scanning. The influence of particle shape on permeability characteristics of porous media was preliminarily analyzed through the permeation test of gravel and glass ball filled samples. The main contents and conclusions of this paper are as follows: (1) the shape of crushed stone is measured by image measuring instrument and special fixture, which enriches the information of particle shape measurement. It lays a foundation for more accurate evaluation of particle shape. (2) five shape parameters are used to evaluate particle shape. The distribution rules of shape parameters of three particle groups were statistically analyzed, and the distribution characteristics of particle shape parameters were obtained, and the differences between gravel particles and standard spheres were compared. Through the comparison of shape parameters, it is pointed out that the aspect ratio, flatness and sphericity can more sensitively reflect the degree of particle deviation from the sphere, and the ratio of length to width is more convenient and direct to obtain the spherical degree than the flatness. Therefore, it has more advantages in maneuverability and efficiency. (3) using CT scanning to obtain the fracture diagrams of gravel and glass-filled specimens, it is found that the internal pore morphology is very complex. The two-dimensional CT images of the selected particle size groups showed good connectivity. With the appropriate pore opening threshold, the pores can be disconnected in the narrow area for the purpose of statistical analysis of pore size and study of fractal characteristics. (4) for the sample filled with crushed stone and glass ball with the same particle group and the same size distribution, The preliminary results show that the more irregular the particle shape, the greater the permeability coefficient.
【學(xué)位授予單位】：長江科學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU411

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本文編號：2065577