长大纵坡沥青路面病害防治技术研究
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摘要
随着国民经济的飞速发展,在山岭重丘区修筑高等级公路已是必不可少,但由于地形、环境、交通等条件恶劣,长大纵坡沥青路面大量出现车辙、推移、拥包等病害。因此,本文在分析国内外研究现状的基础上,以长大纵坡沥青路面病害为研究对象,结合邯沙公路试验路,对层间工作状态、层间材料性能、沥青路面水平推移及竖向永久变形、抗车辙技术和长大纵坡沥青路面设计方法等方面进行深入研究,力图提出符合国情、切实可行的长大纵坡沥青路面病害防治技术。
     本文主要对以下几个方面的内容进行了研究:(1)系统调查研究了车辙、层间滑移等病害产生的原因及其形成机理,提出了应采取的防治措施。(2)分析路面结构参数对长大纵坡沥青路面结构应力的影响,提出了基于防治长大纵坡沥青路面病害的路面结构参数取值原则;系统深入研究并得到了超载、纵坡、行车速度、转弯半径、超高、纵向切向力系数及温度等不同因素对路面结构应力、推移变形和竖向永久变形的影响规律,确定了各因素作用下长大纵坡沥青路面工作状态,首次提出了长大纵坡路段沥青路面工作状态分级,推荐了适用于各分级的层间材料类型、沥青混合料面层材料和组合。(3)通过渗透试验和层间剪切试验,得到不同透层材料的渗透性能排序,确定了不同透层材料的最佳洒布量,研究了透层材料在不同类型及养生龄期半刚性基层顶面的渗透性能,提出了透层材料的评价方法和指标。(4)分别通过层间剪切试验确定了下封层材料和粘层材料的最佳洒布量,分别对其抗剪性能进行了排序;通过层间剪切疲劳试验分别对比分析下封层材料和粘层材料的层间剪切抗疲劳性能;分别提出了下封层材料和粘层材料的评价方法和指标。(5)分析了沥青路面车辙形成机理和影响因素,提出了基于车辙防治的主骨料空隙体积填充沥青混合料设计方法,首次对对该方法和马歇尔法设计的沥青混合料进行单层和组合结构的高温、变坡、变载以及浸水车辙试验,得到了不同沥青混合料单层和组合结构的抗车辙能力排序。(6)根据不同层间材料的层间剪切疲劳方程,综合考虑各种影响因素修正并确定沥青路面层间抗剪强度结构系数,分析确定了层间及沥青混合料面层材料容许剪应力的计算方法;系统研究了沥青路面面层材料及层间抗剪设计思路,首次提出了考虑抗剪及层间剪切疲劳的长大纵坡沥青路面设计方法。
With the rapid development of national economy, in mountainous heavy hilly area building high-grade highway is absolutely necessary. But because of bad condition for terrain, environment and traffic, many diseases of rutting, lapse and upheaval appear in asphalt pavement on large longitudinal slope. Therefore, in this dissertation based on analyzing research status at home and abroad, diseases of asphalt pavement on large longitudinal slope are taken as the research object, combined with test road of Hansha highway, interlayer working state, interlayer material properties, horizontal lapse and vertical permanent deformation of asphalt pavement, anti-rutting technologies and design method of asphalt pavement on large longitudinal slope are further studied in order to propose the feasible technology of prevention and control techniques of diseases for asphalt pavement on large longitudinal slope in accordance with the current national condition.
     Six aspects as follows has been mainly researched in this dissertation:(1) Cause and formation mechanism of rutting, interfacial slip are investigated, prevention measures are proposed.(2) Affects of pavement structural parameters on structural stress of asphalt pavement on large longitudinal slope is comparatively analyzed, adoption principle of pavement structural parameters based on preventing diseases of asphalt pavement on large longitudinal slope is proposed. Influence law of overload, longitudinal slope, speed, turning radius, superelevation, tangential force coefficient, temperature and their comprehensive action on structural stress and horizontal lapse and vertical permanent deformation of asphalt pavement on large longitudinal slope is systematically studied. Working states under the different effects are determined, working state grade is proposed for the first time. Interlayer materials, materials and combinations of asphalt mixture suitable to each working state grade is recommended.(3) Permeability test and interlayer shear test of different kinds of layer-penetration oil are carried out, permeability sorting of different priming materials is gotten, the optimum dosages of different priming materials are determined, priming material permeabilities on semi-rigid base of different types and curing ages are studied, evaluation methods and indexes are proposed.(4) The optimum dosages of lower seal coat materials and tack coat materials are respectively determined using interlayer shear tests, shear performance sorting of them are gotten, interlayer shear fatigue performances of them are comparatively analyzed. Evaluation methods and indexes of them are respectively proposed.(5) Formation mechanism and influencing factors of asphalt pavement rutting are analyzed. Asphalt mixture design method of void volume filled by main aggregate based on anti-rutting is proposed. High temperature rutting test, variable slope rutting test, varying load rutting test and immersion rutting test of the asphalt mixture designed by it and mashell method for monolayer and composite structure are carried out for the first time, rutting resistance sortings of different asphalt mixture for monolayer and composite structure are gotten.(6) According to interlayer shear fatigue equation of different interlayer materials, structure coefficients of interlayer shear strength for asphalt pavement are modified and determined, calculation methods of allowable shear stress for interlayer materials and asphalt mixture are analyzed and determined. Shear design idea of interlayer matirials and asphalt surface materials are systematically studied, design method of asphalt pavement on large longitudinal slope considered with shear and interlayer shear fatigue is proposed for the first time.
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