【作者】 戴震；

【导师】 陈荣生； 倪富健；

【作者基本信息】 东南大学 ， 道路与铁道工程， 2004， 硕士

【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因,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:⑴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;⑵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;⑶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,在沥青面层与半刚性基层之间设置土工加筋材料,对防治反射裂缝的产生、扩展都是非常有效的。更多还原

【Abstract】 With road mileage increasing in our country, the deteriorating of asphalt pavement such as cracking, rutting and pumping is greater. The phenomenon of initial damage of pavement in China indicates that heavy load and bad interface conditions are the main reason of directly damage of pavement. The object of this paper is to analyze the effects of interface conditions, load magnitude and reflective cracking on pavement structure by FEA techniques.Firstly, the contact theory and the method of solving nonlinear equations are summarized. Based on the finite element method, the element stiffness matrix for each element is set up. Secondly, the axis-symmetry model is simulated to analyze the effects of interface conditions, load magnitude and other parameters on asphalt pavement structure. As a consequence, when interface between layers is unbonded, the tensile stress at the bottom of surface layer is large enough to cause cracks to propagate to the surface. The effect of horizontal load on pavement structure in depth is finite, mainly in the range of top of surface layer. The heavy load can make great press on pavement, and rut formation of the road is easily under heavy loads.Thirdly, the linear fracture mechanics method based on the 2-dimensional finite element method were used to analyze the factors influencing the origination and propagation of reflective cracking in asphalt pavement under transportation loading. The theoretically analytical results imply that the effects on preventing the origination and propagation of reflective cracking by providing geogrid between the surface and base layer are effectively.更多还原