本文關(guān)鍵詞： 瀝青混合料 力學(xué)響應(yīng) 疲勞 沖擊 數(shù)值分析　出處：《重慶交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：瀝青混凝土路面以其良好的路用性能得到廣泛應(yīng)用。當(dāng)前,瀝青混合料的高溫穩(wěn)定性、低溫抗裂性能、水穩(wěn)定性等都有成熟有效的、可用于研究或生產(chǎn)用的試驗(yàn)評價(jià)設(shè)備與方法。然而,對于瀝青混合料的疲勞性能,雖然有UTM、MTS等試驗(yàn)設(shè)備,但這些試驗(yàn)設(shè)備較為昂貴,試驗(yàn)復(fù)雜、費(fèi)時(shí)費(fèi)力;從而造成當(dāng)前瀝青混合料的疲勞性能測試往往局限在大學(xué)、研究院等的科研活動(dòng)研究中。同時(shí),作為路面結(jié)構(gòu)的行車荷載具有沖擊特性;而當(dāng)前對瀝青混合料的疲勞特性很少從沖擊荷載的角度進(jìn)行分析和研究。基于以上現(xiàn)狀,論文對瀝青混合料的沖擊疲勞試驗(yàn)設(shè)備、試驗(yàn)方法及疲勞特性進(jìn)行研究。主要研究內(nèi)容與結(jié)論如下:一、瀝青混凝土路面在沖擊荷載作用下的力學(xué)響應(yīng)分析。①利用ANSYS三維有限元數(shù)值分析平臺(tái),建立了移動(dòng)車輛荷載作用下瀝青混凝土路面的數(shù)值模型,對車輛移動(dòng)荷載作用下的路面力學(xué)響應(yīng)規(guī)律進(jìn)行分析。研究表明在車輛移動(dòng)荷載作用下(速度),路面結(jié)構(gòu)的路表計(jì)算點(diǎn)豎向應(yīng)力在0.1s的時(shí)間內(nèi)快速增加到0.898MPa,然后迅速在0.1s的時(shí)間內(nèi)迅速下降到0Mpa。且隨著深度的增加,呈快速降低趨勢,到底基層頂時(shí)為路表的5.97%,到土基頂時(shí)已降到路表的0.75%,表明車輛荷載引起的路面結(jié)構(gòu)的豎向應(yīng)力變化符合沖擊規(guī)律。②將車輛移動(dòng)荷載分別簡化為豎向荷載或者豎向與水平荷載;分別分析不同簡化模式下的路面結(jié)構(gòu)力學(xué)響應(yīng)規(guī)律;結(jié)果表明,車輛水平移動(dòng)荷載對路面結(jié)構(gòu)豎向應(yīng)力與豎向位移的影響較小;車輛水平移動(dòng)荷載主要對路面結(jié)構(gòu)的響應(yīng)時(shí)程產(chǎn)生一定的影響;基于以上結(jié)論,論文將車輛移動(dòng)荷載簡化為移動(dòng)恒定豎向荷載;③建立馬歇爾自動(dòng)擊實(shí)儀的沖擊荷載模型,分析了馬歇爾自動(dòng)擊實(shí)沖擊荷載對瀝青混合料的作用規(guī)律;將車輛移動(dòng)荷載與沖擊荷載作用下的路面力學(xué)響應(yīng)規(guī)律進(jìn)行對比,發(fā)現(xiàn)二者規(guī)律一致,故可將車輛移動(dòng)荷載采用馬歇爾自動(dòng)擊實(shí)儀的沖擊荷載代替。二、研發(fā)沖擊疲勞試驗(yàn)機(jī),并對瀝青混合料試件進(jìn)行高溫穩(wěn)定性、水穩(wěn)定性及沖擊疲勞等綜合路用性能試驗(yàn)分析。①借鑒落錘式?jīng)_擊疲勞試驗(yàn)機(jī)、SHPB沖擊壓桿裝置,根據(jù)第一部分?jǐn)?shù)值分析的結(jié)果,對馬歇爾自動(dòng)擊實(shí)儀進(jìn)行改裝,制成沖擊疲勞試驗(yàn)機(jī);②對沖擊疲勞試驗(yàn)機(jī)的加載方式、應(yīng)變率比等參數(shù)進(jìn)行試驗(yàn)研究,確定沖擊疲勞試驗(yàn)參數(shù)及試驗(yàn)方法;③制備的瀝青混合料試件,進(jìn)行瀝青混合料的綜合路用性能試驗(yàn)。試驗(yàn)表明對應(yīng)于瀝青混合料的最大疲勞壽命存在著一個(gè)最佳的瀝青用量,且該最佳瀝青用量比當(dāng)前規(guī)范規(guī)定的配合比設(shè)計(jì)中確定的最佳瀝青用量大;隨著瀝青混合料最大公稱粒徑的增加,瀝青混合料疲勞壽命縮短;對于相同最大公稱粒徑、不同粗細(xì)類型的瀝青混合料,級(jí)配越細(xì),疲勞壽命越長;同時(shí),不同級(jí)配類型的瀝青混合料,疲勞壽命相差較大,表現(xiàn)為SMA-13大于AC-13大于OGFC-13。
[Abstract]:The asphalt concrete pavement for its good pavement performance has been widely used. At present, the high temperature stability of asphalt mixture, low temperature crack resistance, water stability has a mature and effective, can be used for research or production of test equipment and methods. However, for the asphalt mixture fatigue performance of the material, although there are UTM. MTS test equipment, but the more expensive test equipment, test is complicated, time-consuming and laborious; resulting in the fatigue test of asphalt mixture is often limited in the University, Research Institute and other research activities. At the same time, as has the impact characteristic for traffic load pavement structure; and the fatigue properties of asphalt mixture from the angle of little impact load analysis and research. Based on the above situation, the impact of asphalt mixture fatigue test equipment, test method was studied and the fatigue properties. The main research The contents and conclusions are as follows: first, the mechanical response analysis of asphalt concrete pavement under impact load. Using ANSYS analysis platform of 3D finite element numerical model is established for asphalt concrete pavement under moving vehicle loads, the pavement subjected to moving vehicle loads response were analyzed. The results show that the vehicle moving loads under the table (speed), road pavement structure calculation of vertical stress in 0.1s period increased to 0.898MPa, and then quickly in the 0.1s period decreased rapidly to 0Mpa. and with the increasing depth, showed a rapid decrease in the end of 5.97%, the road surface is at the top, to the top of subgrade when the road surface has been reduced to 0.75%, showed that the vertical pavement traffic load induced stress changes in accordance with law. The impact of vehicles moving load are simplified as a vertical load or the vertical and horizontal load Load; pavement structure mechanics analysis respectively different simplified models of the response laws; the results show that the level of the vehicle moving loads on pavement structure should be vertical with the vertical displacement of the smaller impact force; the vehicle horizontal moving loads have a certain impact on the pavement response time history; based on the above conclusions, the vehicle load is simplified as mobile mobile constant vertical load; the establishment of Marshall compaction apparatus impact load model, analyzes the impact of Marshall compaction load on the asphalt mixture; pavement mechanics of vehicles moving load and impact load response of the comparison, it is found that the two laws are consistent, it can move the vehicle by impact load Marshall automatic load compaction device instead. Two, R & D impact fatigue testing machine, and the high temperature stability of asphalt mixture specimens, water stability and erosion Analysis on fatigue of integrated performance test. The reference impact fatigue testing machine, impact device SHPB pressure bar, according to the first part is the analysis of numerical results, modified Marshall compaction apparatus, made of impact fatigue testing machine; the impact fatigue testing machine load, strain rate ratio parameters experimental study to determine the impact fatigue test parameters and test method of asphalt mixture; the preparation of material specimens, comprehensive road asphalt mixture by performance test. The test shows that the maximum fatigue life of Yu Liqing mixture exists an optimum asphalt content, the optimum asphalt and the optimum asphalt content than with the current specification the ratio of design to determine in large amounts; with the increase of asphalt mixture maximum nominal size, shorten the fatigue life of asphalt mixture; for the same nominal maximum particle size, different thickness type The asphalt mixture, the finer the gradation, the longer the fatigue life. At the same time, the fatigue life of the asphalt mixture with different gradation types is quite different, showing that SMA-13 is greater than AC-13, greater than OGFC-13..

【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

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本文編號(hào)：1464898