基于混合Lagrange-Euler算法的高速公路沥青路面疲劳损害研究

发布时间：2018-10-25 09:13

【摘要】：我国高速公路的发展日新月异,高速、大流量和渠化交通的联合作用很大程度上削弱了高速公路沥青路面的自愈合效用,导致道路早期损坏,再加上超限运输,使得公路路面的损害进一步加重。在沥青路面的破损形式中,疲劳损坏已成为沥青路面破坏的主要形式之一。然而,由于轮胎自身结构和材料的高度非线性以及轮胎充气压力、转动速度、轴载以及轮胎与路面的滚滑关系等因素的影响,轮胎与路面接触应力的大小和分布十分复杂,路面的拉应力和拉应变受上述因素的影响,从而影响到路面的磨损、变形和疲劳寿命。因此,必须建立车轮-路基-路面三维耦合模型来研究沥青路面疲劳寿命的影响因素。主要工作内容如下：1)利用粉土的试验数据对路基土的典型应力相关的动态回弹模量预估模型进行综合评估,并提出了改进的四参数动态回弹模量模型,通过编写用户自定义材料子程序,将改进模型移植到ABAQUS中,实现了对沥青路面-路基结构变形的模拟。2)建立了轮胎-路基-路面结构的三维有限元模型,考虑了轮胎的稳态滚动和路基土的回弹模量的应力相关性,对比了不同形式的简化轮载与直接轮载作用对路基路面结构的静态计算结果的影响,讨论了荷载形式对计算路面与轮胎接触部位的应力-应变响应的影响。3)利用稳态输运分析方法计算了车轮不同滚动状态时路面的稳态响应,获得了轮胎初始自由滚动状态时摩擦系数、轴重、胎压和速度对路面应力-应变的影响规律。4)结合沥青混合料的疲劳寿命预估方程,揭示了沥青路面疲劳开裂机理,并基于拉应变疲劳预估模型,讨论了轮轴阻力、摩擦系数、轴重和胎压等因素对疲劳寿命的影响。
[Abstract]:With the rapid development of expressway in China, the combination of high speed, large volume of traffic and channelized traffic greatly weakens the self-healing effect of highway asphalt pavement, resulting in the early damage of the road, plus the over-limited transportation. The damage to the road surface is further aggravated. In the form of asphalt pavement damage, fatigue damage has become one of the main forms of asphalt pavement damage. However, due to the high nonlinearity of tire structure and material and the influence of tire inflatable pressure, rotation speed, axle load and the relationship between tire and road surface, the size and distribution of contact stress between tire and pavement are very complex. The tensile stress and strain of pavement are affected by the above factors, thus affecting the wear, deformation and fatigue life of pavement. Therefore, it is necessary to establish a three-dimensional model of wheel-subgrade-pavement coupling to study the influencing factors of asphalt pavement fatigue life. The main contents of the work are as follows: 1) the dynamic elastic modulus prediction model related to typical stress of subgrade soil is comprehensively evaluated by using the test data of silt, and an improved four-parameter dynamic elastic modulus model is proposed. The improved model is transplanted into ABAQUS by writing the user-defined material subroutine. The simulation of asphalt pavement subgrade structure deformation is realized. 2) the three-dimensional finite element model of tire subgrade pavement structure is established. Considering the stress correlation between the steady rolling of tire and the modulus of resilience of subgrade soil, the effects of simplified wheel load and direct wheel load on the static calculation results of subgrade and pavement structure are compared. The influence of load form on the stress-strain response of the road surface in contact with the tire is discussed. 3) the steady state response of the road surface under different rolling states of the wheel is calculated by using the steady state transport analysis method. The effects of friction coefficient, axle load, tire pressure and velocity on the pavement stress and strain in the initial free rolling state are obtained. 4) the fatigue cracking mechanism of asphalt pavement is revealed by combining the fatigue life prediction equation of asphalt mixture. Based on the tensile strain fatigue prediction model, the effects of wheel shaft resistance, friction coefficient, axle load and tire pressure on fatigue life are discussed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217

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