【作者】 王超；

【导师】 黄立葵；

【作者基本信息】 湖南大学 ， 交通运输工程， 2011， 硕士

【摘要】 设置良好的路面结构内部排水系统以排除引起各种损坏的水分,成为减少水损害的主要方法。近年来国内对排水基层进行了大量的研究,主要是针对排水基层材料性能、排水性能和力学性能这几个方面。有一些学者对设置排水基层的沥青路面进行了力学分析,然而路面中的水对路面结构有较大影响,本文认为对设排水基层路面的研究有必要考虑路面饱水的影响。本文采用有限元模型进行分析,主要取得如下研究成果:(1)利用有限元软件ABAQUS建立饱水时沥青路面有限元模型。通过比较分析了在无水和饱水两种状态下沥青路面结构的应力应变特性,来研究路面中饱和水对沥青路面的影响。(2)通过比较分析饱水状态的普通路面和设排水层路面应力应变特性,发现一方面设排水层沥青路面由于排水层模量低,使得路面受力较普通路面欠佳;另一方面路面中设置排水层不仅可以减少中下面层的孔隙水压集中,并且可以一定程度上消减路面面层中出现的高孔隙水压,但不能完全解决面层中孔隙水压力过大的问题。设排水层能够从一定程度上降低孔隙水压力对路面结构的破坏作用。(3)将三类不同排水层路面进行比较,三类不同排水层路面结构受力情况各相不同。相比较而言水泥稳定碎石排水路面受力情况较好,受到的冲刷程度也较小,而级配碎石排水层路面结构尤其是基层位置将面临着较其他两类排水层更严峻的冲刷情况。由于开级配沥青稳定碎石(ATPB)较半开级配沥青碎石(AM)存在力学性能不足,耐久性差的缺点,建议在满足路面排水要求的情况下采用大粒径半开级配沥青稳定碎石(AM)作为路面排水层。(4)基于路面结构水损害机理,设计了一种抗冲刷试验装置和试验方法,对路面材料进行抗冲刷试验,寻求一个抗冲刷指标,用于评价沥青混合料的抗冲刷性能。更多还原

【Abstract】 It becomes the main method to reduce water damage that the drainage system is installed in the pavement structure to exclude water causing various damages. Plenty of researches have been conducted in the drainage base in recent years in China, mainly focused on material performance of drainage base, drainage performance and mechanical performance. Some scholar have done mechanical analysis on the asphalt pavement with drainage base, however, the water on the surface of pavement have great impact on the pavement structure. It is believed in this paper that the influence of saturation of pavement is of necessity to be considered in the study of pavement with drainage base.Finite element model is used in this paper to analyze, and the main research results are in the followings:(1) ABAQUS finite element software is applied to establish the finite element model of asphalt pavement in saturation. The stress-strain properties of asphalt pavement structure both in the condition devoid of water and saturated are compared and analyzed to study on the effect of saturation water from pavement on asphalt pavement.(2) It can be found by comparing stress-strain properties of ordinary pavement and pavement with drainage base in saturation condition that, the modulus of drainage layer is low in the asphalt pavement with drainage base, which causes that the stress is worse than that of ordinary pavement. The installment of drainage base in the pavement can not only reduce the concentration of pore water pressure in the surface of pavement, but also can decrease the pore water high pressure occurred in the surface of pavement to some extent, but it cannot solve the problem completely that the pore water pressure is too high in the surface of pavement. The installment of drainage layer can lower damage action of pore water pressure on pavement structure.(3) Pavements with three different types of drainage layers are compared and the forces of pavement structure with different drainage layer are different. It is by compared that the force of drainage pavement built of crush-stones stabilized with cement is comparatively good, and the water erosion is low. But pavement structure with drainage layer built of graded crushed-stone, especially the base, suffers water erosion worse than the other two drainage layers. Because asphalt-treated permeable base (ATPB) is not sufficient in mechanical property compared with AM, and its durability is bad, it is suggested that the AM should be as drainage layer of pavement under the condition of meeting the requirement of pavement drainage.(4) Based on the water damage mechanism of pavement structure, the water erosion tester and experimental method are designed to conduct water erosion test on pavement material. In addition, a water erosion resistance index is found to evaluate the erosion resistance of asphalt mixture.更多还原