溫度與荷載耦合作用下的瀝青路面開裂機理研究
發(fā)布時間：2018-10-08 21:49
【摘要】：裂縫由于存在于瀝青路面壽命的各個階段而成為路面的一種主要破壞方式。目前的裂縫研究主要集中在瀝青疲勞裂紋或反射裂縫,而自上而下的Top-Down是一種比疲勞裂紋和瀝青路面反射裂縫更為嚴(yán)重的破壞模式。傳統(tǒng)路面設(shè)計理論以結(jié)構(gòu)層層底容許彎拉應(yīng)力作為抗裂設(shè)計指標(biāo),對瀝青路面Top-Down裂縫未能做出合理解釋,且關(guān)于Top-Down裂縫的研究多集中在輪胎花紋類型、垂直荷載大小、車速等因素。瀝青路面結(jié)構(gòu)在自然條件下發(fā)揮其路用性能,只研究垂直荷載而忽略水平荷載、溫度是不能真實反映瀝青路面應(yīng)力響應(yīng)及Top-Down裂縫開裂機理。本文基于線彈性力學(xué)、斷裂力學(xué)、彈塑性力學(xué)、粘彈性力學(xué)基本原理,使用ABAQUS有限元軟件模擬分析垂直荷載單獨作用、垂直荷載與水平荷載同時作用、溫度與荷載耦合作用下的瀝青路面結(jié)構(gòu)受力情況及Top-Down裂縫開裂機理,并應(yīng)用最大周向力理論計算Top-Down裂縫尖端I-II復(fù)合型開裂的斷裂角。本文首先建立了路面結(jié)構(gòu)三維有限元模型并驗證其有效性。對瀝青路面在垂直對稱荷載作用下的應(yīng)力響應(yīng)研究和分析。二維有限元模型應(yīng)力響應(yīng)與三維有限元模型一致,在二維有限元模型上添加Top-Down裂縫,裂縫尖端使用奇異單元,通過擴展有限元(XFEM)求得裂縫尖端應(yīng)力強度因子、尖端集中應(yīng)力、J積分和T應(yīng)力,Top-Down裂縫為剪切型開裂。然后在有限元模型中引入水平荷載的作用,考慮水平荷載大小、水平荷載作用位置對瀝青路面結(jié)構(gòu)應(yīng)力分析及Top-Down裂縫尖端參數(shù)的影響。水平荷載與垂直荷載共同作用下,Top-Down裂縫為復(fù)合型開裂,應(yīng)用最大周向力理論計算Top-Down裂縫尖端斷裂角。最終在路面結(jié)構(gòu)模型中引入溫度場,研究分析不同初始溫度、降溫幅度、路面終了溫度對無Top-Down裂縫瀝青路面結(jié)構(gòu)應(yīng)力影響。通過改變Top-Down裂縫的深度、水平荷載及垂直荷載大小及作用位置來探究溫度單獨作用、溫度與荷載耦合作用下Top-Down裂縫開裂機理。
[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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.217;U418.66
本文編號：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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.217;U418.66
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