本文選題：道路工程 + 瀝青混合料��； 參考：《長(zhǎng)安大學(xué)》2016年碩士論文

【摘要】：瀝青混合料是一種由瀝青結(jié)合料、集料、瀝青/集料界面相、微裂紋和空隙組成的多相非均勻復(fù)合材料,其力學(xué)性能極大依賴(lài)于材料復(fù)雜的內(nèi)部結(jié)構(gòu),而這又由組分材料的性能、形狀、尺寸及組成比例所決定。傳統(tǒng)的瀝青混合料力學(xué)性能及損壞機(jī)理分析方法主要包括連續(xù)介質(zhì)力學(xué)理論與宏觀試驗(yàn)方法,這種宏觀尺度的分析方法不能揭示瀝青混合料細(xì)觀非均勻性引起的損傷機(jī)制,如材料內(nèi)部微裂紋的滋生與擴(kuò)展,材料非均勻性導(dǎo)致的微損傷以及應(yīng)力集中引起的局部破壞。構(gòu)建基于細(xì)觀尺度的瀝青混合料細(xì)觀力學(xué)模型,可建立材料宏觀路用性能與細(xì)觀結(jié)構(gòu)參數(shù)的定量關(guān)系,對(duì)瀝青路面材料多尺度分析與精細(xì)化設(shè)計(jì)具有重要意義。本文為建立精確適用瀝青混合料的細(xì)觀力學(xué)模型,首先,綜述了瀝青混合料細(xì)觀力學(xué)模型研究進(jìn)展,并從力學(xué)理論和具體應(yīng)用兩個(gè)角度,將瀝青混合料細(xì)觀力學(xué)模型構(gòu)建中的關(guān)鍵難題,凝練為對(duì)顆粒效應(yīng)、尺寸效應(yīng)、界面效應(yīng)和粘彈效應(yīng)四個(gè)基本力學(xué)問(wèn)題的求解,為進(jìn)一步研究提供指導(dǎo)。其次,選取5種研究常用細(xì)觀力學(xué)模型,開(kāi)展了多模型、多尺度、全頻域?yàn)r青混合料有效動(dòng)態(tài)模量預(yù)測(cè)的適用性驗(yàn)證,并分析得出考慮顆粒相互作用對(duì)構(gòu)建瀝青混合料細(xì)觀力學(xué)模型重要性。再次,通過(guò)引入表征顆粒整體作用強(qiáng)弱的參數(shù)?,對(duì)考慮顆粒相互作用的細(xì)觀力學(xué)J-C模型進(jìn)行了簡(jiǎn)化,并基于彈性粘彈性對(duì)應(yīng)原理,給出了預(yù)測(cè)瀝青膠漿有效復(fù)數(shù)剪切模量的細(xì)觀力學(xué)模型。最后,提出了兩種描述瀝青混合料細(xì)觀結(jié)構(gòu)特性的徑向分布假設(shè),均勻分布和P-Y分布,推導(dǎo)了細(xì)觀力學(xué)J-C模型在兩種假設(shè)分布下的有效模量精確預(yù)測(cè)公式。通過(guò)假設(shè)瀝青混合料為以瀝青砂漿為基體相,粗集料和空隙為夾雜相的多相復(fù)合材料,采用分步添加思想和彈性粘彈性對(duì)應(yīng)原理,建立了考慮顆粒相互作用的瀝青混合料動(dòng)態(tài)模量?jī)刹筋A(yù)測(cè)方法。結(jié)果表明,相比于已有研究,本文提出的考慮顆粒相互作用的細(xì)觀力學(xué)模型對(duì)瀝青膠漿和瀝青混合料有效粘彈性能預(yù)測(cè)具有更高預(yù)測(cè)精度。本文考慮顆粒相互作用的模型,為建立多解耦合、精確適用瀝青混合料的細(xì)觀力學(xué)模型奠定基礎(chǔ)。
[Abstract]:Asphalt mixture is a multiphase heterogeneous composite material consisting of asphalt binder, aggregate, asphalt / aggregate interface phase, micro crack and void. Its mechanical properties depend greatly on the complex internal structure of the material, which is determined by the performance, shape, size and composition of the component materials. The mechanical properties of the traditional asphalt mixture. The analysis methods of damage mechanism mainly include the continuous medium mechanics theory and the macro test method. This macro scale analysis method can not reveal the damage mechanism caused by the meso heterogeneity of asphalt mixture, such as the propagation and propagation of the micro cracks in the material, the micro damage caused by the material inhomogeneity and the local breakage caused by the stress concentration. The meso mechanical model of asphalt mixture based on the meso scale is constructed, and the quantitative relationship between the properties of the material and the parameters of the microstructure can be established. It is of great significance to the multi-scale analysis and fine design of asphalt pavement material. This paper is to establish a meso mechanical model for the precise application of asphalt mixture. First, the asphalt mixture is summarized. The research progress of the meso mechanical model is made. From two angles of mechanics theory and concrete application, the key problem in the construction of the meso mechanical model of asphalt mixture is to be solved to solve four basic mechanical problems, such as particle effect, size effect, interface effect and viscoelastic effect, and provide guidance for further research. Secondly, 5 kinds of research are selected. In common use of mesoscopic mechanics model, the applicability of multi model, multi scale, full frequency domain asphalt mixture effective dynamic modulus prediction is carried out, and the importance of considering particle interaction to construct the meso mechanical model of asphalt mixture is analyzed. Again, by introducing the parameters that characterize the strength of the particles as a whole, the interaction of particles is considered. The mesoscopic mechanical J-C model is simplified, and based on the elastic viscoelastic correspondence principle, a meso mechanical model for predicting the effective complex shear modulus of asphalt mortar is given. Finally, two kinds of radial distribution hypothesis, uniform distribution and P-Y distribution are proposed to describe the microstructure characteristics of asphalt mixture, and two kinds of meso mechanical J-C models are derived. A two step prediction method of dynamic modulus of asphalt mixture with particle interaction is established by assuming that asphalt mixture is a multi-phase composite material with bituminous mortar as matrix phase, coarse aggregate and void phase, by assuming the step addition idea and elastic viscoelastic correspondence principle. The results show that the meso mechanical model proposed in this paper has a higher prediction accuracy for the prediction of effective viscoelastic properties of asphalt mixture and asphalt mixture compared with the existing research. This paper considers the model of particle interaction, which lays the foundation for establishing multi solution coupling and accurately applying the meso mechanical model of asphalt mixture.

【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：U414

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