混合式基層瀝青路面車轍仿真分析
發(fā)布時間：2018-10-05 13:49
【摘要】：車轍是瀝青路面的常見病害,實(shí)際路用性能顯示,即使完全按照現(xiàn)行瀝青路面設(shè)計規(guī)范要求進(jìn)行設(shè)計,高溫地區(qū)車轍病害仍然十分嚴(yán)重。復(fù)雜的自然環(huán)境直接導(dǎo)致路面結(jié)構(gòu)的損壞和病害的大幅增加,降低路面的使用性能和服務(wù)壽命,造成了巨大的經(jīng)濟(jì)損失和社會影響。本文研究了廣西地區(qū)高溫多雨氣候環(huán)境下的高速公路瀝青路面車轍病害,結(jié)合當(dāng)?shù)啬嫌�、百羅、平鐘三條高速公路的現(xiàn)場調(diào)研分析總結(jié)。將以路面芯樣為對象研究的混合料結(jié)構(gòu)類型的評價方法用于配合比設(shè)計階段,與貝雷法、CAVF法等的礦料級配計算方法結(jié)合,嚴(yán)格控制級配設(shè)計。對用馬歇爾試件來進(jìn)行評定時,直接采用馬歇爾試模來代替容量筒,這樣有利于比較且可減小測量時帶來的誤差。運(yùn)用有限元法對四種不同組合的路面結(jié)構(gòu)進(jìn)行了車轍分析,針對混合式基層與半剛性基層瀝青路面的車轍對比可知,通過合理的結(jié)構(gòu)設(shè)計,前者車轍深度要更小抗車轍性能更優(yōu)越,如結(jié)構(gòu)A路面相對車轍深度為較D結(jié)構(gòu)小1.57mmm。經(jīng)過論證得出以水穩(wěn)為底基層,級配碎石為過渡層,及大粒徑瀝青碎石混合料作下面層的混合式基層瀝青路面結(jié)構(gòu),不僅有利于減少路面裂縫的產(chǎn)生,改善瀝青路面的內(nèi)部排水,提高瀝青路面穩(wěn)定性和耐久性,而且不會因其剪切破壞而產(chǎn)生更嚴(yán)重的車轍。瀝青路面中面層是車轍變形的主要層面。模擬計算結(jié)果顯示,B、C兩種結(jié)構(gòu)結(jié)構(gòu)中間層面所占比例占到了71.6%和75.2%,進(jìn)一步確定了車轍變形發(fā)生在中面層這機(jī)理,模擬結(jié)果與實(shí)踐經(jīng)驗(yàn)理論相符。同時對比以往主要采用加速加載試驗(yàn)和足尺試驗(yàn)來研究車轍問題,這些都需要耗費(fèi)大量的時間和金錢,而用計算機(jī)模擬技術(shù)可以減緩這些壓力,可為我國高速公路瀝青路面建設(shè)提供新的研究方向。
[Abstract]:Rutting is a common disease of asphalt pavement. The actual pavement performance shows that rutting is still very serious in high temperature area even if it is designed in accordance with the requirements of current asphalt pavement design code. The complex natural environment directly leads to the damage of pavement structure and the substantial increase of disease, reduces the pavement performance and service life, and causes huge economic loss and social impact. In this paper, the rutting disease of asphalt pavement of expressway in high temperature and rainy climate in Guangxi is studied, and the field investigation and analysis of three expressways in Nanyou, Bailo and Pingzhong are analyzed and summarized. The evaluation method of mixture structure type based on the core sample of road surface is used in the design stage of mix proportion, which is combined with the calculation method of ore aggregate gradation by Bayley method and CAVF method, and the gradation design is strictly controlled. When Marshall specimen is used for evaluation, Marshall test model is directly used to replace the capacity cylinder, which is advantageous to comparison and can reduce the error caused by measurement. The rutting analysis of four kinds of pavement structures with different combinations is carried out by using finite element method. According to the rutting comparison between the mixed base and semi-rigid base asphalt pavement, the reasonable structural design is obtained. The rutting depth of the former is less than that of the D structure, and the rutting resistance of the former is better, for example, the relative rutting depth of the structure A pavement is 1.57 mm / m smaller than that of the D structure. After demonstration, it is concluded that the mixed base asphalt pavement structure with water stability as the base, graded crushed stone as the transition layer, and large particle size asphalt macadam mixture as the lower layer is not only conducive to reducing the occurrence of pavement cracks, Improve the internal drainage of asphalt pavement, improve the stability and durability of asphalt pavement, and will not cause more serious rutting due to its shear failure. The middle surface of asphalt pavement is the main layer of rut deformation. The simulation results show that 71.6% and 75.2% of the middle layers of the two structures account for 71.6% and 75.2% respectively. The mechanism of rutting deformation in the middle layer is further determined. The simulation results are in agreement with the practical experience theory. At the same time, more than ever, accelerated loading tests and full-scale tests are used to study rutting problems, all of which cost a lot of time and money, and the use of computer simulation technology can alleviate these pressures. It can provide a new research direction for highway asphalt pavement construction in China.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.217;U418.68
本文編號：2253639
[Abstract]:Rutting is a common disease of asphalt pavement. The actual pavement performance shows that rutting is still very serious in high temperature area even if it is designed in accordance with the requirements of current asphalt pavement design code. The complex natural environment directly leads to the damage of pavement structure and the substantial increase of disease, reduces the pavement performance and service life, and causes huge economic loss and social impact. In this paper, the rutting disease of asphalt pavement of expressway in high temperature and rainy climate in Guangxi is studied, and the field investigation and analysis of three expressways in Nanyou, Bailo and Pingzhong are analyzed and summarized. The evaluation method of mixture structure type based on the core sample of road surface is used in the design stage of mix proportion, which is combined with the calculation method of ore aggregate gradation by Bayley method and CAVF method, and the gradation design is strictly controlled. When Marshall specimen is used for evaluation, Marshall test model is directly used to replace the capacity cylinder, which is advantageous to comparison and can reduce the error caused by measurement. The rutting analysis of four kinds of pavement structures with different combinations is carried out by using finite element method. According to the rutting comparison between the mixed base and semi-rigid base asphalt pavement, the reasonable structural design is obtained. The rutting depth of the former is less than that of the D structure, and the rutting resistance of the former is better, for example, the relative rutting depth of the structure A pavement is 1.57 mm / m smaller than that of the D structure. After demonstration, it is concluded that the mixed base asphalt pavement structure with water stability as the base, graded crushed stone as the transition layer, and large particle size asphalt macadam mixture as the lower layer is not only conducive to reducing the occurrence of pavement cracks, Improve the internal drainage of asphalt pavement, improve the stability and durability of asphalt pavement, and will not cause more serious rutting due to its shear failure. The middle surface of asphalt pavement is the main layer of rut deformation. The simulation results show that 71.6% and 75.2% of the middle layers of the two structures account for 71.6% and 75.2% respectively. The mechanism of rutting deformation in the middle layer is further determined. The simulation results are in agreement with the practical experience theory. At the same time, more than ever, accelerated loading tests and full-scale tests are used to study rutting problems, all of which cost a lot of time and money, and the use of computer simulation technology can alleviate these pressures. It can provide a new research direction for highway asphalt pavement construction in China.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.217;U418.68
【參考文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前1條
1 王書延;混合式基層瀝青路面材料與力學(xué)性能研究[D];重慶交通大學(xué);2008年
，本文編號：2253639
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