温度与荷载耦合作用下的沥青路面开裂机理研究
发布时间：2018-10-08 21:49
【摘要】：裂缝由于存在于沥青路面寿命的各个阶段而成为路面的一种主要破坏方式。目前的裂缝研究主要集中在沥青疲劳裂纹或反射裂缝,而自上而下的Top-Down是一种比疲劳裂纹和沥青路面反射裂缝更为严重的破坏模式。传统路面设计理论以结构层层底容许弯拉应力作为抗裂设计指标,对沥青路面Top-Down裂缝未能做出合理解释,且关于Top-Down裂缝的研究多集中在轮胎花纹类型、垂直荷载大小、车速等因素。沥青路面结构在自然条件下发挥其路用性能,只研究垂直荷载而忽略水平荷载、温度是不能真实反映沥青路面应力响应及Top-Down裂缝开裂机理。本文基于线弹性力学、断裂力学、弹塑性力学、粘弹性力学基本原理,使用ABAQUS有限元软件模拟分析垂直荷载单独作用、垂直荷载与水平荷载同时作用、温度与荷载耦合作用下的沥青路面结构受力情况及Top-Down裂缝开裂机理,并应用最大周向力理论计算Top-Down裂缝尖端I-II复合型开裂的断裂角。本文首先建立了路面结构三维有限元模型并验证其有效性。对沥青路面在垂直对称荷载作用下的应力响应研究和分析。二维有限元模型应力响应与三维有限元模型一致,在二维有限元模型上添加Top-Down裂缝,裂缝尖端使用奇异单元,通过扩展有限元(XFEM)求得裂缝尖端应力强度因子、尖端集中应力、J积分和T应力,Top-Down裂缝为剪切型开裂。然后在有限元模型中引入水平荷载的作用,考虑水平荷载大小、水平荷载作用位置对沥青路面结构应力分析及Top-Down裂缝尖端参数的影响。水平荷载与垂直荷载共同作用下,Top-Down裂缝为复合型开裂,应用最大周向力理论计算Top-Down裂缝尖端断裂角。最终在路面结构模型中引入温度场,研究分析不同初始温度、降温幅度、路面终了温度对无Top-Down裂缝沥青路面结构应力影响。通过改变Top-Down裂缝的深度、水平荷载及垂直荷载大小及作用位置来探究温度单独作用、温度与荷载耦合作用下Top-Down裂缝开裂机理。
[Abstract]:Cracks are one of the main failure modes of asphalt pavement due to their existence in various stages of asphalt pavement life. At present, the research of crack is mainly focused on asphalt fatigue crack or reflection crack, and top-down Top-Down is a more serious failure mode than fatigue crack and asphalt pavement reflection crack. The traditional pavement design theory regards the allowable flexural tensile stress at the bottom of the structure as the design index of crack resistance. The Top-Down crack of asphalt pavement can not be explained reasonably, and the research on Top-Down crack is mainly focused on the tire pattern type and vertical load. Speed, etc. Asphalt pavement structure can not reflect the stress response of asphalt pavement and Top-Down crack cracking mechanism by studying vertical load but neglecting horizontal load under natural conditions. Based on the basic principles of linear elastic mechanics, fracture mechanics, elastoplastic mechanics and viscoelastic mechanics, the vertical load acting alone and the vertical load acting simultaneously with horizontal load are simulated by ABAQUS finite element software. Under the coupling of temperature and load, the stress of asphalt pavement structure and the cracking mechanism of Top-Down crack are analyzed. The maximum circumferential force theory is applied to calculate the fracture angle of I-II composite crack at the tip of Top-Down crack. In this paper, a three-dimensional finite element model of pavement structure is established and its validity is verified. The stress response of asphalt pavement under vertical symmetric load is studied and analyzed. The stress response of the two-dimensional finite element model is consistent with that of the three-dimensional finite element model. The Top-Down crack is added to the two-dimensional finite element model and the singular element is used at the crack tip. The stress intensity factor at the crack tip is obtained by extending the finite element (XFEM). The tip concentrated stress J integral and the T stress top-Down crack are shear cracking. Then the effect of horizontal load is introduced into the finite element model, and the influence of horizontal load and the position of horizontal load on the stress analysis of asphalt pavement structure and the crack tip parameters of Top-Down are considered. Top-Down crack is a composite crack under both horizontal and vertical loads. The maximum circumferential force theory is applied to calculate the fracture angle at the tip of Top-Down crack. Finally, the temperature field is introduced into the pavement structure model to study the effect of different initial temperature, cooling range and end temperature on the stress of asphalt pavement without Top-Down crack. By changing the depth, horizontal load, vertical load and action position of Top-Down crack, the cracking mechanism of Top-Down crack under the action of temperature alone, temperature and load coupling is explored.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217;U418.66
本文编号：2258380
[Abstract]:Cracks are one of the main failure modes of asphalt pavement due to their existence in various stages of asphalt pavement life. At present, the research of crack is mainly focused on asphalt fatigue crack or reflection crack, and top-down Top-Down is a more serious failure mode than fatigue crack and asphalt pavement reflection crack. The traditional pavement design theory regards the allowable flexural tensile stress at the bottom of the structure as the design index of crack resistance. The Top-Down crack of asphalt pavement can not be explained reasonably, and the research on Top-Down crack is mainly focused on the tire pattern type and vertical load. Speed, etc. Asphalt pavement structure can not reflect the stress response of asphalt pavement and Top-Down crack cracking mechanism by studying vertical load but neglecting horizontal load under natural conditions. Based on the basic principles of linear elastic mechanics, fracture mechanics, elastoplastic mechanics and viscoelastic mechanics, the vertical load acting alone and the vertical load acting simultaneously with horizontal load are simulated by ABAQUS finite element software. Under the coupling of temperature and load, the stress of asphalt pavement structure and the cracking mechanism of Top-Down crack are analyzed. The maximum circumferential force theory is applied to calculate the fracture angle of I-II composite crack at the tip of Top-Down crack. In this paper, a three-dimensional finite element model of pavement structure is established and its validity is verified. The stress response of asphalt pavement under vertical symmetric load is studied and analyzed. The stress response of the two-dimensional finite element model is consistent with that of the three-dimensional finite element model. The Top-Down crack is added to the two-dimensional finite element model and the singular element is used at the crack tip. The stress intensity factor at the crack tip is obtained by extending the finite element (XFEM). The tip concentrated stress J integral and the T stress top-Down crack are shear cracking. Then the effect of horizontal load is introduced into the finite element model, and the influence of horizontal load and the position of horizontal load on the stress analysis of asphalt pavement structure and the crack tip parameters of Top-Down are considered. Top-Down crack is a composite crack under both horizontal and vertical loads. The maximum circumferential force theory is applied to calculate the fracture angle at the tip of Top-Down crack. Finally, the temperature field is introduced into the pavement structure model to study the effect of different initial temperature, cooling range and end temperature on the stress of asphalt pavement without Top-Down crack. By changing the depth, horizontal load, vertical load and action position of Top-Down crack, the cracking mechanism of Top-Down crack under the action of temperature alone, temperature and load coupling is explored.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217;U418.66
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