级配碎石复合式基层沥青路面力学性能研究

发布时间：2018-02-11 07:18

本文关键词： 反射裂缝级配碎石复合式基层力学性能非线性分析　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着半刚性基层沥青路面结构形式在我国的广泛应用,半刚性基层缩裂所导致的路面开裂等问题也日益成为研究人员关注的热点。采用级配碎石复合式基层沥青路面能够很好的预防半刚性基层沥青路面反射裂缝的问题,基于此,本文对其力学性能进行了分析研究,以期能够为级配碎石复合式基层沥青路面的进一步推广和应用提供指导作用。首先,在对级配碎石材料特性分析的基础上,对级配碎石的力学非线性本构模型进行了分析,将其分为弹性非线性本构模型和弹塑性非线性本构模型两类,同时为使级配碎石的力学性能得到充分发挥,对级配碎石原材料技术指标以及级配设计范围进行了分析研究。其次,基于级配碎石弹性非线性本构模型,采用KENLAYER非线性程序对级配碎石复合式基层沥青路面进行了非线性力学计算,分析了路面各结构层力学参数对沥青路面各力学指标的影响大小,确定了对各力学指标影响最大的力学参数,并对级配碎石复合式基层沥青路面和半刚性基层沥青路面的各力学指标进行了对比分析,论证了级配碎石复合式基层沥青路面的合理性,并结合试验路光纤检测结果,对两种路面结构沥青面层层底拉应变进行了分析,论证了分析结果的合理性。基于级配碎石弹塑性非线性本构模型,采用ABAQUS有限元软件对级配碎石复合式基层沥青路面的力学性能进行了有限元分析,重点分析了级配碎石层弹性模量和厚度对沥青路面各力学指标的影响,并与弹性非线性分析结果进行对比,发现两种分析方法在分析结果方面是一致的。最后,基于断裂力学原理,引入裂缝尖端应力强度因子作为评价指标,对级配碎石复合式基层沥青路面和半刚性基层沥青路面的抗裂性能进行了对比分析,论证了级配碎石复合式基层沥青路面能够很好的预防沥青路面反射裂缝的发生;同时通过改变级配碎石层的厚度和弹性模量,计算分析了级配碎石参数的取值对级配碎石复合式基层沥青路面裂缝尖端应力强度因子的影响。
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217

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