本文選題：瀝青穩(wěn)定碎石 + 復合式基層��； 參考：《西安工業(yè)大學》2017年碩士論文

【摘要】：半剛性基層瀝青路面在過去很長一段時間內(nèi),被國內(nèi)外廣泛使用,但其容易產(chǎn)生反射裂縫,從而導致路面在使用前期就出現(xiàn)車轍、沉陷、疲勞開裂等破壞。為此,我國提出了復合式基層路面結(jié)構(gòu),即底基層為半剛性基層,上基層為瀝青穩(wěn)定碎石或級配碎石柔性基層。通過查閱大量文獻表明,對于防止反射裂縫的發(fā)生,級配碎石復合式基層瀝青路面的效果不及瀝青穩(wěn)定碎石的效果,同時,瀝青混合料的模量直接影響路面的受力情況,故本文以瀝青穩(wěn)定碎石復合式基層瀝青路面為研究對象,借助ABAQUS有限元軟件,來分析各面層模量對路面應(yīng)力的影響,為其進一步被廣泛使用提供一定的指導作用。通過對路面力學模型的對比,確定出以時間硬化蠕變模型來模擬瀝青混合料的蠕變特性,并將車輪作用荷載簡化為矩形均布荷載,創(chuàng)建路面模型來進行應(yīng)力分析,得出:當各面層模量增加時,豎向壓應(yīng)力和Mises屈服拉應(yīng)力變小,而縱向剪應(yīng)力變大;當上面層模量增大時,橫向剪應(yīng)力變大,但當中面層和下面層模量增加時,其變小。同時上面層模量對最大橫向剪應(yīng)力、最大縱向剪應(yīng)力及最大Mises屈服拉應(yīng)力的影響最大,中面層模量對最大豎向壓應(yīng)力的影響最大,故宜選擇較低標號的瀝青,如30#瀝青、50#瀝青,或者在瀝青混合料中加入適量的高模量外加劑,來增加中面層的模量,從而降低其產(chǎn)生的豎向壓應(yīng)力,防止路面產(chǎn)生沉陷或車轍病害。另外為了減小拉應(yīng)力,防止路面產(chǎn)生疲勞開裂,上面層宜采用骨架密實型級配類型或適當增加膠結(jié)料的含量,或者在較高溫度下進行施工。最后,在檢測瀝青穩(wěn)定碎石復合式基層瀝青路面的最大豎向壓應(yīng)力、最大縱向剪應(yīng)力及最大Mises屈服拉應(yīng)力時,只需在任意一側(cè)車輪的中心處取樣檢測即可,而檢測最大橫向剪應(yīng)力時,只需在任意一側(cè)車輪內(nèi)側(cè)取樣即可。本文所研究內(nèi)容對瀝青穩(wěn)定碎石復合式基層瀝青路面的設(shè)計、施工和檢測都提供了一定的理論依據(jù),同時也對其增加使用壽命,減緩車轍、沉陷等破壞,增強服務(wù)性能和運營安全,降低養(yǎng)護和運營費用提供了非常好的指導意義。
[Abstract]:Semi-rigid base asphalt pavement has been widely used at home and abroad for a long time in the past, but it is easy to produce reflective cracks, which leads to rutting, subsidence, fatigue cracking and so on. Therefore, the pavement structure of compound base is put forward in our country, that is, the base is semi-rigid base, the base is asphalt stabilized macadam or graded macadam flexible base. By consulting a large number of documents, it is shown that the effect of graded crushed stone composite base asphalt pavement is not as good as that of asphalt stabilized macadam, and the modulus of asphalt mixture directly affects the stress of pavement. Therefore, this paper takes asphalt stabilized macadam composite base asphalt pavement as the research object, with the help of Abaqus finite element software, to analyze the influence of each surface layer modulus on pavement stress, and provide some guidance for its further wide use. Through the comparison of pavement mechanics model, the time hardening creep model is established to simulate the creep characteristics of asphalt mixture, and the wheel load is simplified to rectangular uniform load, and the pavement model is established to analyze the stress. It is concluded that the vertical compressive stress and Mises yield tensile stress become smaller and the longitudinal shear stress becomes larger when the modulus of each surface layer increases, while the transverse shear stress increases with the increase of the modulus of the upper layer, but decreases with the increase of the modulus of the middle layer and the lower layer. At the same time, the modulus of the upper layer has the greatest influence on the maximum transverse shear stress, the maximum longitudinal shear stress and the maximum Mises yield tensile stress, and the modulus of the middle layer has the greatest influence on the maximum vertical compressive stress. Therefore, the lower grade asphalt, such as 30# asphalt and 50# asphalt, should be chosen. Or adding appropriate amount of high modulus admixture to the asphalt mixture to increase the modulus of the middle surface layer so as to reduce the vertical compressive stress and prevent the road surface from subsidence or rutting disease. In addition, in order to reduce the tensile stress and prevent the fatigue cracking of the pavement, the upper layer should adopt the framework dense gradation type or increase the content of the binder properly, or carry on the construction under the higher temperature. Finally, in the detection of maximum vertical compressive stress, maximum longitudinal shear stress and maximum Mises yield tensile stress of asphalt pavement with asphalt stabilized macadam composite base, it is only necessary to sample and detect at the center of any wheel. When measuring the maximum transverse shear stress, it is only necessary to sample the inside of any side of the wheel. The content of this paper provides a certain theoretical basis for the design, construction and inspection of asphalt pavement with asphalt stabilized macadam compound base course, and at the same time, it also provides a certain theoretical basis for increasing its service life, slowing down rutting, subsidence, and so on. Enhance service performance and operational safety, reduce maintenance and operating costs to provide very good guidance.
【學位授予單位】：西安工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U416.217

【參考文獻】

相關(guān)期刊論文 前10條

1 趙明峰;;高速公路瀝青混凝土路面早期破壞[J];黑龍江科技信息;2016年32期

2 崔新壯;黃丹;劉磊;藍日彥;呂海波;趙艷林;曹衛(wèi)東;常成利;;瀝青路面病害力學研究進展[J];山東大學學報(工學版);2016年05期

3 田振騰;;復合式基層長壽命瀝青路面結(jié)構(gòu)分析[J];交通世界;2016年23期

4 馬晉峰;;淺談瀝青混凝土路面破壞的原因及防治措施[J];公路交通科技(應(yīng)用技術(shù)版);2016年08期

5 張平;朱寶林;曹艷華;;復合式基層瀝青路面力學響應(yīng)分析[J];公路交通科技(應(yīng)用技術(shù)版);2016年07期

6 李耀龍;;瀝青路面病害分析及大修技術(shù)探討[J];科技創(chuàng)新與應(yīng)用;2016年16期

7 李sョ，

本文編號：2011274