【作者】 陈东鹏；

【导师】 童申家；

【作者基本信息】 西安建筑科技大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 本论文首先针对我国目前沥青路面结构形式单一,路面早期损伤严重等问题,提出研究新型沥青路面结构的必要性。以内蒙古地区为试点,结合内蒙古地区的特殊自然环境与实际交通状况,拟定了三大类五种沥青路面结构(包括柔性基层沥青路面、全厚式沥青路面、组合式基层沥青路面),根据室内材料试验结果及现行《沥青路面结构设计规范》,确定了所需筑路材料的回弹模量、劈裂强度等设计参数。其次应用Bissar3.0设计软件,对本文拟定的五种沥青路面结构进行模拟分析,得出以下重要结论：(1)级配碎石骨料在荷载的作用下位置做出相应的调整,同时应力重分布,骨料重新排列,会使产生的裂缝得到一定程度的弥合,因此级配碎石材料在裂缝的问题上,具有自愈性的特点。(2)全厚式沥青路面结构的主要优点是总厚度比有常规基层的沥青路面结构更薄,同时可以减少长生疲劳裂缝的可能性,并使路面可能发生的损伤限制在路面结构的上部。(3)路基模量越大对路面结构的疲劳寿命越有利,可以通过设计适宜模量的基层材料和提高路面基层的厚度及路基强度的方法延长路面结构的使用寿命。(4)组合式基层沥青路面结构一的面层厚度从5cm增长到11cm时面层层底拉应变逐渐增大,并且在11cm处面层层底拉应变最大,之后随厚度增加面层层底拉应变缓慢减小。(5)级配碎石层不宜过厚,过厚将加快沥青面层疲劳损坏,也不能太薄,太薄将不能充分发挥其防止反射裂缝的作用,综合多方面因素,建议15-20cm左右比较合适。最后对试验路段进行了检测和路用性能分析,并分析了不同沥青路面结构组合的病害成因和防治措施,从而达到从路面结构方面对沥青路面的早期损坏进行防冶的目的。依此,推荐了五种适用的沥青路面典型结构。更多还原

【Abstract】 This paper first proposes it is necessary to research new asphalt pavement structure, because of currently asphalt pavement structural style to be unitary, road surface early injury serious and so on questions in our country. Trial in Inner Mongolia region, combined with the special natural environment in Inner Mongolia and the actual traffic conditions, the development of the three categories of five asphalt pavement structure (including the flexible asphalt pavement, full depth asphalt pavement, asphalt pavement combined), according to Interior material test results and the current "Asphalt Pavement Structure Design", established the necessary road material modulus, split tensile strength and other design parameters.Secondly, this paper simulates and analysises five kind of asphalt pavement structure by using the Bissar3.0 design software, draws the following important conclusion:(1) Under the effect of the loading,graded crushed stone adjust position, at the same time, stress will redistribute, crushed stone will re-arrange, so the crack obtains the certain extent closing, therefore the graded broken stone material in the crack question, has the self-recovery characteristic.(2) The main advantages of full depth asphalt pavement is that its total thickness is thinner than a conventional asphalt pavement, reduce the possibility of fatigue cracks,limit road damage that may occur in the upper part of the road structure.(3) More subgrade modulus is better for the pavement structure fatigue life, in order to prolong life of the pavement structure, you can design appropriate modulus of base material and improve the road base thickness and subgrade strength.(4) when modular structure of an asphalt pavement surface layer thickness from 5cm up to 11cm, the tensile strain increases gradually, and the tensile strain in11cm place is the largest, then follows with the change of thickness and tensile strain is reduced slowly.(5) Graded gravel layer should not be too thick, if that will speed up the asphalt surface fatigue damage, at the same time, should not be too thin, if that will not be able to fully play its role to prevent reflective cracking, integrated various factors, propose that about 15-20cm more appropriate.Finally, the paper tests experimented the road section and analysis road performance, and analysis disease causes and prevention measures,of asphalt pavement with different combinations, to achieve the pavement structure from the early damage of asphalt pavement for the purpose of prevention and cure. Accordingly, recommended a five for a typical asphalt pavement structure.更多还原