铺设应力吸收层沥青加铺结构抗反射裂缝研究

发布时间：2018-01-08 20:16

本文关键词：铺设应力吸收层沥青加铺结构抗反射裂缝研究　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：过去的水泥混凝土路面间总是不可避免地存在裂缝与接缝,在温度变化与行车的长期作用下将出现反射裂缝,路面的原有特性受到影响,路面的使用期限也将比预期更短。目前最常用的改造措施也是效果较为明显的一种方法,就是将沥青混凝土面层加盖于原有的水泥混凝土路面,这样的施工方法不仅简便,而且成本较低,对环境的负面作用小,同时还能最大程度地使用原有路面作为路基。一种性质特殊的聚合物改性沥青混合料可用作应力吸收层,其防水渗透效果良好,颗粒的粒径小,所含沥青百分比高;具有良好的低温韧性和高温稳定性,能够消散应力集中现象,消除部分剪切应力和拉伸应力;厚度效应可以吸收应力,偏离效应可以让反射裂缝偏离原裂缝。应力吸收层自身是具有一定的厚度的,因此沥青加铺层结构的厚度得以减小。应力吸收层的材料主要有:乳化沥青处理集料、沥青碎石、软沥青混凝土、橡胶沥青(SAMI)、STRATA应力吸收系统(高弹性的聚合物胶结材料和最大粒径为9.5mm的集料形成的混合料)、SAMPAVE应力吸收层。设置应力吸收层对减缓反射裂缝具有一定的效果,在防治和延缓反射裂缝产生和扩展时需综合考虑路面时间情况以找出合理的防裂措施,达到预期的理想效果。本文主要研究了以下内容:首先,开展荷载应力分析。以ABAQUS为工具开展仿真模拟,在设定的行车荷载下,对加铺结构的应力、弯沉及弯沉差随应力吸收层的厚度和模量、沥青混凝土加铺层的厚度变化而变化的规律进行了深入探究。其次,开展温度应力分析。以ABAQUS为工具开展仿真模拟,在设定的温度荷载作用下,对加铺结构的应力、弯沉及弯沉差随应力吸收层的厚度和模量、沥青混凝土加铺层的厚度变化而变化的规律进行了深入探究。再者,进行荷载-温度耦合应力分析。以ABAQUS为工具开展仿真模拟,在对应的耦合作用下,对加铺应力吸收层结构的耦合应力进行了探究。对比分析了橡胶沥青应力吸收层与改性乳化沥青纤维封层这两种常见的应力吸收层的耦合应力。
[Abstract]:In the past, there were always cracks and joints between the cement concrete pavement. Under the effect of temperature change and driving for a long time, there would be reflective cracks, and the original characteristics of the pavement would be affected. At present, the most commonly used retrofit measures are also a more effective method, which is to cover the asphalt concrete surface on the original cement concrete pavement. This construction method is not only simple, but also lower cost, less negative effect on the environment. At the same time, the original pavement can be used as subgrade to the maximum extent. A special polymer modified asphalt mixture can be used as stress absorbing layer, its waterproof and permeation effect is good, the particle size is small. High percentage of asphalt; It has good low temperature toughness and high temperature stability, which can dissipate stress concentration phenomenon and eliminate partial shear stress and tensile stress. The thickness effect can absorb the stress and the deviation effect can make the reflection crack deviate from the original crack. The stress absorption layer itself has a certain thickness. Therefore, the thickness of asphalt overlay structure can be reduced. The main materials of stress absorption layer are: emulsified asphalt treatment aggregate, asphalt macadam, soft asphalt concrete, rubber asphalt. STRATA stress absorption system (a mixture of highly elastic polymer cementing materials and aggregates with a maximum particle size of 9.5 mm). SAMPAVE stress absorption layer. Setting stress absorption layer has certain effect on reducing reflection crack. When preventing and delaying the occurrence and extension of reflective cracks, it is necessary to consider the pavement time situation comprehensively to find out reasonable crack prevention measures to achieve the desired results. This paper mainly studies the following contents: first of all. ABAQUS is used as a tool to simulate the stress, deflection and deflection difference of overlay structure with stress absorption layer thickness and modulus. The law of the change of the thickness of asphalt concrete overlay is deeply explored. Secondly, the temperature stress analysis is carried out. Using ABAQUS as the tool, the simulation is carried out, under the action of the set temperature load. The variation of stress, deflection and deflection difference with the thickness and modulus of the stress absorption layer and the thickness of the asphalt concrete overlay are studied. The load-temperature coupling stress analysis is carried out. ABAQUS is used as a tool to carry out simulation, under the corresponding coupling action. The coupling stress between the rubber asphalt stress absorption layer and the modified emulsified asphalt fiber seal layer is studied. The coupling stress between the rubber asphalt stress absorption layer and the modified emulsified asphalt fiber seal layer is analyzed.
【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

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