本文關(guān)鍵詞： 反射裂縫 級配碎石 復(fù)合式基層 力學(xué)性能 非線性分析　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著半剛性基層瀝青路面結(jié)構(gòu)形式在我國的廣泛應(yīng)用,半剛性基層縮裂所導(dǎo)致的路面開裂等問題也日益成為研究人員關(guān)注的熱點(diǎn)。采用級配碎石復(fù)合式基層瀝青路面能夠很好的預(yù)防半剛性基層瀝青路面反射裂縫的問題,基于此,本文對其力學(xué)性能進(jìn)行了分析研究,以期能夠?yàn)榧壟渌槭瘡?fù)合式基層瀝青路面的進(jìn)一步推廣和應(yīng)用提供指導(dǎo)作用。首先,在對級配碎石材料特性分析的基礎(chǔ)上,對級配碎石的力學(xué)非線性本構(gòu)模型進(jìn)行了分析,將其分為彈性非線性本構(gòu)模型和彈塑性非線性本構(gòu)模型兩類,同時(shí)為使級配碎石的力學(xué)性能得到充分發(fā)揮,對級配碎石原材料技術(shù)指標(biāo)以及級配設(shè)計(jì)范圍進(jìn)行了分析研究。其次,基于級配碎石彈性非線性本構(gòu)模型,采用KENLAYER非線性程序?qū)壟渌槭瘡?fù)合式基層瀝青路面進(jìn)行了非線性力學(xué)計(jì)算,分析了路面各結(jié)構(gòu)層力學(xué)參數(shù)對瀝青路面各力學(xué)指標(biāo)的影響大小,確定了對各力學(xué)指標(biāo)影響最大的力學(xué)參數(shù),并對級配碎石復(fù)合式基層瀝青路面和半剛性基層瀝青路面的各力學(xué)指標(biāo)進(jìn)行了對比分析,論證了級配碎石復(fù)合式基層瀝青路面的合理性,并結(jié)合試驗(yàn)路光纖檢測結(jié)果,對兩種路面結(jié)構(gòu)瀝青面層層底拉應(yīng)變進(jìn)行了分析,論證了分析結(jié)果的合理性�；诩壟渌槭瘡椝苄苑蔷�性本構(gòu)模型,采用ABAQUS有限元軟件對級配碎石復(fù)合式基層瀝青路面的力學(xué)性能進(jìn)行了有限元分析,重點(diǎn)分析了級配碎石層彈性模量和厚度對瀝青路面各力學(xué)指標(biāo)的影響,并與彈性非線性分析結(jié)果進(jìn)行對比,發(fā)現(xiàn)兩種分析方法在分析結(jié)果方面是一致的。最后,基于斷裂力學(xué)原理,引入裂縫尖端應(yīng)力強(qiáng)度因子作為評價(jià)指標(biāo),對級配碎石復(fù)合式基層瀝青路面和半剛性基層瀝青路面的抗裂性能進(jìn)行了對比分析,論證了級配碎石復(fù)合式基層瀝青路面能夠很好的預(yù)防瀝青路面反射裂縫的發(fā)生;同時(shí)通過改變級配碎石層的厚度和彈性模量,計(jì)算分析了級配碎石參數(shù)的取值對級配碎石復(fù)合式基層瀝青路面裂縫尖端應(yīng)力強(qiáng)度因子的影響。
[Abstract]:With the extensive application of semi-rigid base asphalt pavement structure in our country, The problem of pavement cracking caused by shrinkage crack of semi-rigid base is also becoming a hot spot of researchers. The use of graded crushed stone composite asphalt pavement can prevent the reflection crack of semi-rigid base asphalt pavement very well, based on this, In this paper, the mechanical properties of the asphalt pavement are analyzed and studied in order to provide guidance for the further promotion and application of graded crushed stone composite base asphalt pavement. Firstly, based on the analysis of the characteristics of graded crushed stone materials, The mechanical nonlinear constitutive model of graded crushed stone is analyzed, which is divided into two categories: elastic nonlinear constitutive model and elastoplastic nonlinear constitutive model. The technical index and the design range of graded crushed stone are analyzed and studied. Secondly, based on the elastic constitutive model of graded crushed stone, The nonlinear mechanics calculation of asphalt pavement with graded macadam compound base course is carried out by using KENLAYER nonlinear program. The influence of mechanical parameters of each structure layer on the mechanical index of asphalt pavement is analyzed. The mechanical parameters which have the greatest influence on each mechanical index are determined, and the mechanical indexes of graded crushed stone composite base asphalt pavement and semi-rigid base asphalt pavement are compared and analyzed. The rationality of graded crushed stone composite base asphalt pavement is demonstrated. Combined with the fiber optic test results of the test road, the tensile strain of two kinds of pavement structure asphalt surface layer is analyzed. The rationality of the analysis results is demonstrated. Based on the elastoplastic nonlinear constitutive model of graded crushed stone, the mechanical properties of graded crushed stone composite base asphalt pavement are analyzed by using ABAQUS finite element software. The influence of elastic modulus and thickness of graded crushed stone layer on the mechanical indexes of asphalt pavement is analyzed, and compared with the results of elastic nonlinear analysis, it is found that the two analytical methods are consistent in the analysis results. Based on the principle of fracture mechanics and introducing the stress intensity factor of crack tip as evaluation index, the crack resistance of asphalt pavement with graded crushed stone composite base and semi-rigid base asphalt pavement is compared and analyzed. It is proved that the composite asphalt pavement with graded crushed stone can prevent the reflection crack of asphalt pavement and change the thickness and elastic modulus of graded crushed stone. The influence of gradation gravel parameters on the stress intensity factor of asphalt pavement crack tip is calculated and analyzed.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.217

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本文編號：1502497