半刚性路面反射裂缝防治中应力吸收层的理论分析与实验研究

发布时间：2018-01-25 16:42

本文关键词： 放射裂缝防治应力吸收层力学分析　出处：《河北工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文主要通过对路面结构进行力学分析，探讨应力吸收层的铺设对沥青下面层底部受力状态的影响，并分析应力吸收层本身的厚度、模量、粘结条件变化对层底受力状态的影响，以此为参考，对应力吸收层材料进行设计、试验评价；最后通过往返荷载试验，对沥青混合料的抗疲劳开裂性能进行综合比较。探讨应力吸收层在半刚性路面反射裂缝防治中的积极意义。 1、通过三维元模型与Ansys分析软件，模拟沥青路面受力状况，对不同应力吸收层模量、厚度与工况进行分析，在国际上首次发现有效的应力吸收层应当具有一定的厚度与一定的模量，并提出合理厚度为1.5到3cm，，合理模量为500到800MPa。 2、对多种沥青混合料与应力吸收层方案进行了应变控制疲劳试验与往复轮载试验，试验结果显示，高沥青用量的橡胶沥青混合料作为半刚性基层的应力吸收层，可以有效防治反射裂缝。 3、提出了半刚性路面防治反射裂缝技术方案，采用具有一定厚度与模量的高沥青用量的橡胶沥青混合料作为应力吸收层延缓初始裂缝的出现，最后在沥青面层适当采用疲劳性能优异的高沥青用量的橡胶沥青混合料延缓反射裂缝的发展。
[Abstract]:This paper mainly through the mechanical analysis of the pavement structure, to explore the influence of stress absorbing layer laid on the stresses at the bottom of the asphalt layer below, and the analysis of the stress absorbing layer the thickness, modulus, impact state bond conditions change force on the bottom layer, as a reference, the stress absorbing layer material design finally, the test evaluation; through the cyclic loading test, a comprehensive comparison of the anti cracking performance of asphalt mixture. The positive meaning of the stress absorbing layer in preventing reflection cracks in semi rigid pavement.
1, through the three-dimensional element model and Ansys software, simulation of Asphalt Pavement Stress Conditions of different stress absorbing layer modulus, thickness and working condition analysis, for the first time in the world to find effective stress absorbing layer shall have a certain thickness and modulus, and put forward the reasonable thickness of 1.5 to 3cm, the reasonable modulus 500 to 800MPa.
2, a variety of asphalt mixture and stress absorbing layer scheme of strain control fatigue test and reciprocating load test, the test results show that the rubber asphalt mixture of high dosage of asphalt binder as a semi rigid base stress absorbing layer, can effectively prevent reflection crack.
3, put forward the technical scheme of semi rigid pavement reflection crack, the rubber asphalt mixture with high content of asphalt has certain thickness and modulus of stress absorbing layer appears as a slow initial crack, finally in asphalt pavement by adopting high fatigue performance of asphalt rubber asphalt mixture with excellent amount of material development delay the reflection crack..

【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U418.66

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