本文選題：瀝青混合料 + 數(shù)字圖像處理　； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：瀝青混合料是由集料、空隙和瀝青膠漿組成的三相復(fù)合材料，是一種典型的非均質(zhì)、不連續(xù)的顆粒性質(zhì)的材料。但是，現(xiàn)行彈性層狀體系理論假設(shè)瀝青混合料為各向同性的均質(zhì)材料，，與實際情況明顯不符。 本文首先成型連續(xù)級配和間斷級配瀝青混合料車轍試件，經(jīng)切割、組裝后再開展不同溫度和荷載條件下的車轍試驗，定性分析了基于位移等值線的試件內(nèi)部顆粒運動規(guī)律；結(jié)合數(shù)字圖像處理技術(shù)、統(tǒng)計方法，定量分析了試件內(nèi)部顆粒的運動規(guī)律，據(jù)此對車轍試驗板的均質(zhì)區(qū)、非均質(zhì)區(qū)進行了劃分；最后，采用PFC離散元程序，模擬分析了兩種不同級配瀝青混合料的車轍試驗，進一步驗證了均質(zhì)區(qū)和非均質(zhì)區(qū)劃分方法。研究主要結(jié)論如下： （1）、在相同外界條件及荷載作用下，間斷級配混合料相比于密級配混合料發(fā)生不規(guī)則顆粒運動的區(qū)域略大。且溫度的升高或作用荷載的增大都會引起混合料內(nèi)部非均質(zhì)區(qū)范圍增加。 （2）、本文中所研究的幾種混合料經(jīng)壓實后，內(nèi)部顆粒主軸角度主要集中在80-100°范圍內(nèi)；加載位置下方顆粒Y方向位移（豎向）基本朝下，該區(qū)域內(nèi)位移方向角分布比較均勻；而加載位置兩側(cè)范圍內(nèi)，顆粒豎向位移存在著一定負向位移（朝上運動），且位移角度主要集中在0-50°之內(nèi)，即加載位置兩側(cè)顆粒位移主要向兩側(cè)擴散，并有部分顆粒被朝向擠壓。 （3）、采用采用灰色關(guān)聯(lián)分析方法，對溫度和荷載兩因素與不同類型混合料內(nèi)部非均質(zhì)區(qū)范圍的關(guān)聯(lián)程度進行分析可知，密級配混合料對溫度的敏感性與荷載的敏感性差別相對較小，而間斷級配混合料受荷載的影響明顯強于溫度對其的影響。 （4）、離散元模擬結(jié)果表明，瀝青混合料中力鏈的傳遞以及顆粒位移矢量規(guī)律與真實試驗結(jié)果較為吻合，離散元在一定程度上能夠模擬真實加載過程中材料內(nèi)部顆粒運動的規(guī)律。
[Abstract]:Asphalt mixture is a three-phase composite composed of aggregate, void and asphalt paste. It is a typical heterogeneous and discontinuous material with particle properties. However, the present theory of elastic layered system assumes that the asphalt mixture is isotropic homogeneous material, which is obviously inconsistent with the actual situation. In this paper, the continuous gradation and discontinuous gradation of asphalt mixture rutting specimens are first formed. After cutting and assembling, the rutting tests under different temperature and load conditions are carried out, and the internal particle motion law of the specimens based on displacement isoline is analyzed qualitatively. Combined with digital image processing technology and statistical method, the motion law of particles inside the specimen is quantitatively analyzed, according to which the homogeneous and heterogeneous areas of rutting test plate are divided. Finally, PFC discrete element program is used. The rutting tests of two kinds of asphalt mixtures with different gradation are simulated and analyzed, and the method of dividing homogeneous and heterogeneous areas is further verified. The main findings of the study are as follows: Under the same external conditions and loads, the area of irregular particle movement of discontinuous gradation mixture is slightly larger than that of dense gradation mixture. And the increase of temperature or the increase of the action load will cause the increase of the range of the heterogeneous zone inside the mixture. After compaction of several kinds of mixtures studied in this paper, the angle of main axis of internal particles is mainly concentrated in the range of 80-100 擄, the displacement of Y direction (vertical) is basically downward under the loading position, and the angular distribution of displacement direction in this area is relatively uniform. However, in the range of both sides of loading position, the vertical displacement of particles has certain negative displacement (moving upward, and the displacement angle is mainly within 0-50 擄), that is, the displacement of both sides of the loading position mainly diffuses to both sides, and some particles are extruded towards the two sides. In this paper, the grey correlation analysis method is used to analyze the correlation degree between temperature and load and the range of internal heterogeneity of different kinds of mixtures. The sensitivity of dense gradation mixture to temperature and load is relatively small, while the influence of discontinuous gradation mixture is stronger than that of temperature. The simulation results of discrete element show that the law of force chain transfer and particle displacement vector in asphalt mixture is in good agreement with the real test results, and the discrete element can simulate the law of particle movement in the course of real loading to some extent.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

【參考文獻】

相關(guān)期刊論文 前5條

1 韓曉軍,苗長云,王亞青;基于標準圖像文件格式的數(shù)字圖像處理方法[J];遼寧工程技術(shù)大學(xué)學(xué)報(自然科學(xué)版);2000年05期

2 姚立陽;馬勤;何忠茂;;基于離散元理論的OGFC礦料級配設(shè)計[J];北京工業(yè)大學(xué)學(xué)報;2013年06期

3 張肖寧,李智,虞將苗;瀝青混合料的體積組成及其數(shù)字圖像處理技術(shù)[J];華南理工大學(xué)學(xué)報(自然科學(xué)版);2002年11期

4 趙衍運,蔡安妮,孫景鰲;基于對象的數(shù)字圖像處理軟件設(shè)計方法[J];計算機工程與應(yīng)用;2002年03期

5 金峰,賈偉偉,王光綸;離散元-邊界元動力耦合模型[J];水利學(xué)報;2001年01期

相關(guān)博士學(xué)位論文 前1條

1 田莉;基于離散元方法的瀝青混合料勁度模量虛擬試驗研究[D];長安大學(xué);2008年

本文編號：1899126