本文選題：冷再生瀝青路面　切入點：超載　出處：《長安大學》2014年碩士論文　論文類型：學位論文

【摘要】：本文針對車輛超載現(xiàn)象的日益嚴重性和冷再生瀝青路面使用的日益廣泛性，參考有關規(guī)范和相關技術文獻，通過有限元法模擬了冷再生瀝青路面中的一種典型路面結構，根據(jù)各結構層的彈性模量、密度、泊松比等物理參數(shù)，使用移動荷載進行加載，對超載作用下各結構層尤其是冷再生層的動力特性進行對比分析并總結規(guī)律。 本文在緒論中介紹了冷再生瀝青路面的國內(nèi)外研究現(xiàn)狀，并列出了本文的主要研究內(nèi)容和創(chuàng)新點；第二章介紹了相關的力學理論，為后面的分析打好理論基礎；第三章根據(jù)一種典型的冷再生路面結構和超載車輛接地面積及壓強的計算建立有限元模型；第四章具體分析了標準軸載時移動荷載作用下冷再生瀝青路面各結構層的各向動位移、動應力、動應變、水平動剪應力和橫向動剪應力的動力響應；第五章的第一節(jié)，對不同超載率作用下冷再生瀝青路面各結構層的動力響應進行了對比分析，得出超載對路面結構損傷的程度比在正常荷載作用下大得多，因此在部分特殊地區(qū)（比如采礦區(qū)）的冷再生瀝青路面設計中，有必要考慮車輛的超載因素，否則，容易使路面結構提前遭到破壞，過早進入維修期。第五章的第二節(jié)，分別對不同超載率、不同冷再生層層厚作用下冷再生瀝青路面各結構層的動力響應進行了對比分析，建議在此種結構下冷再生層層厚取20~25cm為宜，此時能夠在確保路面性能的基礎上節(jié)約材料，減少工程造價。第五章的第三節(jié)，選取冷再生層層厚為15cm，對不同超載率、不同行車速度作用時冷再生瀝青路面各結構層的動力響應進行了對比分析,根據(jù)分析結果得出，從車速提高使車輛的移動荷載對路面任一點的作用時間變短這個角度來說，車速的提高是有利于路面的，，從實際道路表面不平整、路面有積水或積雪、車輛行駛過程中制動、轉(zhuǎn)彎等偶然因素作用的情況下來說，車速增加使路面沖擊動力增大，對路面結構極為不利，建議對車輛限速。 最終結果表明，冷再生瀝青路面具有良好的強度可以保證路面具有較高的承載力，滿足一般的路用性能要求。但是超載作用對冷再生瀝青路面的影響是巨大的，在交通管理中，應該對超載車輛進行嚴格的控制，以保證路面具有較好的行駛質(zhì)量和較長的使用壽命。本文為實踐中冷再生技術的設計、施工提供了科學依據(jù)。
[Abstract]:In view of the increasing seriousness of vehicle overload phenomenon and the increasing popularity of cold recycled asphalt pavement, referring to relevant specifications and related technical documents, this paper simulates a typical pavement structure in cold recycled asphalt pavement by finite element method. According to the physical parameters such as elastic modulus, density and Poisson's ratio of each structure layer, the dynamic characteristics of each structure layer, especially the cold regenerated layer, under the action of overload are analyzed and summarized by moving load. In the introduction, this paper introduces the domestic and international research status of cold recycled asphalt pavement, and lists the main research contents and innovation points of this paper. The second chapter introduces the relevant mechanics theory, which lays a good theoretical foundation for the later analysis. In the third chapter, a finite element model is established according to a typical cold-regenerated pavement structure and the calculation of ground area and pressure of overloaded vehicle. In chapter 4th, the dynamic responses of dynamic displacement, dynamic stress, dynamic strain, horizontal dynamic shear stress and transverse dynamic shear stress of each structure layer of cold recycled asphalt pavement under moving load under standard axial loading are analyzed. The dynamic response of each structure layer of cold recycled asphalt pavement under the action of different overload ratio is compared and analyzed. It is concluded that the degree of damage caused by overload on pavement structure is much greater than that under normal load. Therefore, in the design of cold recycled asphalt pavement in some special areas (such as mining areas), it is necessary to consider the overload factor of vehicles, otherwise, it is easy to destroy the pavement structure ahead of time and enter the second section of Chapter 5th. The dynamic responses of each structure layer of cold recycled asphalt pavement under the action of different overload ratio and different cold regenerative layer thickness are compared and analyzed respectively. It is suggested that the thickness of cold regenerated layers under this kind of structure should be 20 ~ 25cm. In the third section of Chapter 5th, the thickness of the cold regenerated layer is 15 cm, and the overloading rate is different. The dynamic response of each structure layer of cold regenerated asphalt pavement under different driving speeds is compared and analyzed. According to the analysis results, it is concluded that, from the point of view of increasing the speed of the vehicle, the action time of moving load on any point of the road becomes shorter, The increase of vehicle speed is beneficial to the road surface. In the case of uneven road surface, stagnant or snowy road surface, braking and turning in the course of the vehicle, it is said that the increase of speed increases the impact power of the road surface. It is very unfavorable to the pavement structure, so it is suggested to limit the speed of the vehicle. The final results show that the cold recycled asphalt pavement has a good strength to ensure that the pavement has a higher bearing capacity to meet the general road performance requirements, but the impact of overload on the cold recycled asphalt pavement is great. In traffic management, overloaded vehicles should be strictly controlled in order to ensure better driving quality and long service life. This paper provides a scientific basis for the design and construction of intermediate cold regeneration technology.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.217

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