本文關(guān)鍵詞： 倒裝式路面結(jié)構(gòu) 路用性能 力學(xué)響應(yīng) 疲勞性能　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：長期以來,由于半剛性基層擁有較大的強(qiáng)度與剛度,較高的承載能力、荷載擴(kuò)散能力和抗行車疲勞性能等優(yōu)點,被廣泛應(yīng)用于撫順地區(qū)各級公路瀝青路面的建設(shè)中。然而隨著半剛性基層的廣泛使用,其難以克服的缺點逐漸顯現(xiàn),很多研究者把目光轉(zhuǎn)向了倒裝式路面結(jié)構(gòu)、柔性基層路面結(jié)構(gòu)等新型路面結(jié)構(gòu)。本文依據(jù)撫順地區(qū)實際情況,進(jìn)行了倒裝式路面結(jié)構(gòu)的室內(nèi)路用性能試驗,并對其力學(xué)響應(yīng)情況及疲勞性能進(jìn)行了研究。通過室內(nèi)試驗得到:骨架密實型級配碎石動回彈模量為112.7MPa、靜回彈模量為334MPa;連續(xù)型級配碎石動回彈模量為116.5MPa、靜回彈模量為362MPa。通過室內(nèi)CBR試驗得到:骨架密實型與連續(xù)型級配碎石CBR值分別為123.8%、101.75%,骨架密實型級配碎石的CBR值較大,驗證了其具有良好的承載力。運用MTS810材料試驗機(jī)對級配碎石永久變形進(jìn)行研究,研究表明:隨荷載作用次數(shù)的增加,骨架密實型與連續(xù)型級配級配碎石粒料的軸向永久變形逐漸增加,當(dāng)重復(fù)荷載作用到達(dá)1000次時,永久變形量基本穩(wěn)定;隨應(yīng)力逐漸增加試件的累積變形速率也相應(yīng)增加,當(dāng)達(dá)到一定作用次數(shù)時,永久變形將不繼續(xù)增加。通過ABAQUS模擬得到:倒裝式路面結(jié)構(gòu)不僅能夠防止半剛性基層反射裂縫的產(chǎn)生,同時在受力上表現(xiàn)為受力更加均勻,直接從根源上減少了半剛性基層開裂的可能。通過調(diào)整厚度和模量進(jìn)行力學(xué)響應(yīng)分析得到:中、輕交通的級配碎石層推薦厚度是110~140mm,推薦施工達(dá)到的模量是350~450MPa。采用NSOFT軟件進(jìn)行倒裝式和半剛性基層路面結(jié)構(gòu)疲勞性能分析,從面層損傷程度分析:倒裝式路面結(jié)構(gòu)大于半剛性路面結(jié)構(gòu),但是倒裝式路面結(jié)構(gòu)的瀝青混合料面層與半剛性路面結(jié)構(gòu)瀝青混合料面層的疲勞損傷在同一數(shù)量級上,表明二者的疲勞性能相差不大,兩者的水泥穩(wěn)定碎石層疲勞損傷程度比較相近。本文的研究成果為級配碎石倒裝式路面結(jié)構(gòu)的推廣應(yīng)用提出了一定的基礎(chǔ)性的認(rèn)識,可以為設(shè)計和進(jìn)一步研究工作提供參考。
[Abstract]:For a long time, semi-rigid base has many advantages, such as high strength and rigidity, high load-carrying capacity, load diffusing ability and anti-fatigue performance, etc. It has been widely used in the construction of asphalt pavement at all levels in Fushun area. However, with the extensive use of semi-rigid base course, its insurmountable shortcomings gradually appear, many researchers have turned their eyes to the inverted pavement structure. According to the actual situation of Fushun area, the indoor pavement performance test of the inverted pavement structure is carried out. The mechanical response and fatigue properties of the macadam are studied. The results of laboratory tests show that the dynamic resilience modulus of the dense graded crushed stone is 112.7MPa, the static elastic modulus is 334MPa, the dynamic springback modulus of the continuous graded crushed stone is 116.5MPa, and the static springback modulus is 116.5 MPa. The results of laboratory CBR test show that the CBR values of skeleton dense grained crushed stone and continuous graded crushed stone are 123.8and 101.75, respectively, and the CBR value of skeleton dense graded crushed stone is larger than that of continuous graded crushed stone. It is proved that it has good bearing capacity. The permanent deformation of graded crushed stone is studied by MTS810 material testing machine. The results show that: with the increase of the number of loads, The axial permanent deformation of the gradation grained crushed stone with dense skeleton and continuous gradation increases gradually, and when the repeated load reaches 1000 times, the permanent deformation is basically stable, and the cumulative deformation rate of the specimen increases with the increasing of the stress. When a certain number of actions are reached, the permanent deformation will not continue to increase. Through ABAQUS simulation, it is concluded that the inverted pavement structure can not only prevent the formation of reflective cracks in semi-rigid base, but also show a more uniform force on the force. The possibility of cracking of semi-rigid base is reduced directly from the source. By adjusting the thickness and modulus of the base, the following results are obtained:. The recommended thickness of graded crushed stone layer for light traffic is 110 ~ 140mm, and the recommended modulus of construction is 350 ~ 450MPa. the fatigue performance of pavement structure with inverted and semi-rigid base is analyzed by NSOFT software. From the analysis of the damage degree of the surface layer: the inverted pavement structure is larger than the semi-rigid pavement structure, but the fatigue damage of the asphalt mixture surface layer of the inverted pavement structure is the same order of magnitude as that of the semi-rigid pavement structure asphalt mixture surface. The results show that the fatigue performance of the two is not different, and the fatigue damage degree of the cement stabilized crushed stone layer is similar. The research results of this paper provide a certain basic understanding for the popularization and application of graded crushed stone inverted pavement structure. It can provide reference for design and further research.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.2

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