摘要在我国道路里程不断增加的同时,路面的早期破坏现象也越来越突出,这些现象主要包括横向裂缝,坑槽和唧浆等等。针对这些早期破坏,我国研究和应用了许多防治和处理措施,但是效果并不显著。沥青路面的早期破坏现象表明,重载、超载是导致路面损坏的主要原冈,同时路面层间接触不良也是导致沥青路面早期损坏的重要原因。为了能够进一步了解路面结构的受力机理,本文利用有限元力学计算,综合分析层间接触状态、加载特性和路面开裂对路面结构应力的影响。首先,概述有限元接触理论及求解非线性方程的方法。根据有限元理论,建立各单元刚度矩阵。其次,在弹性状态下,建立轴对称有限元模型,重点分析层间接触状态、加载特性和结构层计算参数对沥青路面结构应力的影响。结果表明:(1)层间联结状态的好坏对于路面结构的受力影响相当明显,联结状况不良容易使接触上层底部受拉开裂;(2)水平荷载对路面结构深度方向上的影响是有限的,主要集中在面层上部大约6cm的范围内:(3)重载交通会对路面产生较大的压应力,道路在重载作用下更容易出现车辙。最后,应用断裂力学原理和平面有限元技术,建立线弹性断裂模型有限元分析方法, 用于分析交通荷载作用下影响沥青面层内反射裂缝产生和扩展的因素,结果显示,、扩展都是非常有效的。关键词:沥青路面,有限元,层间接触,重载,反射裂缝 Abstract Abstract With roadmileage increasing in rL'tTy,the deteriorating ofasphaltpavement such as cracking,rutting and pumping phenomenon ofinitialdamage ofpavement in China indicates thatheavy loadand bad interfaceconditions arethe main reason ofdirectly damage object ofthispaper is toanalyze theeffects ofinterfaceconditions, loadmagnitude andreflectivecracking on pavement structure by FEA techniques. Firstly,the contact theory andthemethod ofsolving nonlinear equations alestunmarized. Based onthe finiteelement method,the element stiffnessmatrixforeachelement is setup. SecondlN the axis—symmetry model is simulated to analyze the effects of interface conditions,load magnitude and other parameters on asphalt pavement a consequence,when interfacebetween layers isunbonded,the tensile stress atthe bosom of surfacelayer islargeenough to cause crackstopropagate tothe effectofhorizontal load on pavement structure indepth isfinite,mainly in therange oftop ofsurface heavy load can make greatpress ollpavement,and rutformation ofthe road iseasily under heavy loads. Thirdly,the linearfracturemechanics method based on the2-dimensional finiteelement method were used toanalyze the factorsinfluencing theoriginationandpropagation ofreflective cracking inasphalt pavement under theoretically analytical results imply th
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