本文關(guān)鍵詞： 瀝青混合料 粘彈性 模量主曲線 有限元分析 力學(xué)響應(yīng)　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國交通事業(yè)的發(fā)展,以及對(duì)路面材料和路面結(jié)構(gòu)研究的逐步深入,瀝青與瀝青混合料的粘彈性行為模擬及路用性能分析已經(jīng)成為瀝青路面工程的一個(gè)重要研究方向。路面結(jié)構(gòu)力學(xué)響應(yīng)分析是解釋路面病害機(jī)理并進(jìn)行路面結(jié)構(gòu)設(shè)計(jì)的核心,而路面材料的力學(xué)參數(shù)及本構(gòu)關(guān)系則是力學(xué)響應(yīng)分析的基礎(chǔ)。本文對(duì)瀝青混合料材料粘彈性參數(shù)模型進(jìn)行了研究,提出了2種模型理論。利用ABAQUS有限元軟件模擬路面在行車荷載下的力學(xué)響應(yīng),并與現(xiàn)行的彈性理論得到的響應(yīng)進(jìn)行對(duì)比,從而促進(jìn)粘彈性理論在路面設(shè)計(jì)中的應(yīng)用。 本文首先進(jìn)行了不同工況下的三軸復(fù)數(shù)模量試驗(yàn),從試驗(yàn)中得到不同試驗(yàn)條件下瀝青混合料的存儲(chǔ)模量、損失模量、動(dòng)態(tài)模量和相位角數(shù)據(jù)。建立等壓存儲(chǔ)模量主曲線,分析圍壓對(duì)瀝青混合料粘彈性力學(xué)響應(yīng)的影響,進(jìn)而建立參考溫度和參考圍壓下的三軸存儲(chǔ)模量主曲線,構(gòu)建考慮圍壓的粘彈性力學(xué)參數(shù)模型。 其次,通過對(duì)原始的HN模型進(jìn)行改進(jìn),得到更符合瀝青混合料粘彈性性質(zhì)的改進(jìn)HN模型,進(jìn)而推導(dǎo)出存儲(chǔ)模量和損失模量表達(dá)式。將三軸復(fù)數(shù)模量試驗(yàn)得到的存儲(chǔ)模量和損失模量試驗(yàn)數(shù)據(jù),通過數(shù)學(xué)方法與推導(dǎo)的公式進(jìn)行擬合,確定了改進(jìn)HN模型材料參數(shù)和與溫度相關(guān)的參數(shù),進(jìn)而建立可以一致的表征材料參數(shù)的統(tǒng)一模擬方法。 最后,在有限元軟件ABAQUS上建立三維有限元路面模型,進(jìn)行有限元模擬。分別將路面材料視為粘彈性和彈性材料,對(duì)路面施加半正弦波形荷載,進(jìn)行有限元分析,計(jì)算目前路面設(shè)計(jì)規(guī)范中的控制指標(biāo)：路表彎沉、瀝青層和半剛性基層層底彎拉應(yīng)力。分析比較兩種不同材料參數(shù)得到的力學(xué)響應(yīng),同時(shí)研究不同溫度和不同行車速度下的力學(xué)響應(yīng)的變化規(guī)律,并解釋這些規(guī)律和現(xiàn)象產(chǎn)生的機(jī)理,為瀝青混凝土路面的設(shè)計(jì)方法的改進(jìn)奠定基礎(chǔ)。 本研究旨在為瀝青混合料粘彈性力學(xué)行為的分析提供一個(gè)更為完整的思路,促進(jìn)粘彈性理論在道路設(shè)計(jì)中的應(yīng)用；同時(shí)可以進(jìn)一步分析各設(shè)計(jì)要素對(duì)路面結(jié)構(gòu)使用性能的影響,提出延緩病害產(chǎn)生及發(fā)展對(duì)策,進(jìn)而可以為路面結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供有效的途徑。
[Abstract]:With the development of transportation industry in China, the research on pavement materials and pavement structure has been deepened step by step. The viscoelastic behavior simulation and pavement performance analysis of asphalt and asphalt mixture have become an important research direction of asphalt pavement engineering. The mechanical response analysis of pavement structure is to explain the mechanism of pavement disease and design pavement structure. The core of the plan. The mechanical parameters and constitutive relations of pavement materials are the basis of mechanical response analysis. The viscoelastic parameter model of asphalt mixture materials is studied in this paper. In this paper, two model theories are put forward, and the mechanical response of pavement under driving load is simulated by ABAQUS finite element software, and compared with the response obtained by the current elastic theory. Thus, the application of viscoelastic theory in pavement design is promoted. In this paper, triaxial complex modulus tests under different working conditions are carried out first, and the storage modulus and loss modulus of asphalt mixture under different test conditions are obtained from the test. The main curve of isobaric storage modulus is established, and the influence of confining pressure on viscoelastic response of asphalt mixture is analyzed, and the main curve of triaxial storage modulus under reference temperature and reference confining pressure is established. A viscoelastic parameter model considering confining pressure was established. Secondly, by improving the original HN model, the improved HN model, which is more in line with the viscoelastic properties of asphalt mixture, is obtained. Then the expressions of storage modulus and loss modulus are derived. The experimental data of storage modulus and loss modulus obtained from triaxial complex modulus test are fitted by mathematical method and the derived formula. The material parameters and temperature-related parameters of the improved HN model were determined, and a uniform simulation method for characterizing the material parameters was established. Finally, the 3D finite element pavement model is established on the finite element software ABAQUS, and the pavement material is treated as viscoelastic and elastic material respectively, and the pavement is subjected to semi-sine wave load. Finite element analysis is carried out to calculate the control indexes in the current pavement design code: surface deflection, bending tensile stress of asphalt layer and semi-rigid base layer. The mechanical responses obtained from two different material parameters are analyzed and compared. At the same time, the variation law of mechanical response at different temperature and different driving speed is studied, and the mechanism of these laws and phenomena is explained, which lays a foundation for improving the design method of asphalt concrete pavement. The purpose of this study is to provide a more complete idea for the analysis of viscoelastic behavior of asphalt mixture and to promote the application of viscoelastic theory in road design. At the same time, it can further analyze the influence of each design element on the pavement structure performance, and put forward the countermeasures to delay the occurrence and development of the disease, which can provide an effective way for the optimization design of the pavement structure.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U414;U416.2

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本文編號(hào)：1455324