开级配大粒径沥青碎石防裂层沥青路面疲劳寿命与抗裂机理数值分析

发布时间：2018-02-22 18:35

本文关键词： 道路工程开级配大粒径沥青碎石二维有限元疲劳寿命抗裂机理数值分析应力强度因子　出处：《武汉理工大学学报》2014年10期 　论文类型：期刊论文

【摘要】：为了解决刚性基层沥青路面存在的沥青面层反射裂缝问题,提出了采用开级配大粒径沥青碎石混合料(Opengraded Large Stone Asphalt Mixes,OLSM)作为裂缝缓解层的方法,以国内外OLSM参考级配为基础,结合试验段修筑情况,采用二维有限元方法,建立设置OLSM-25裂缝缓解层的沥青路面有限元模型,对设置不同类型裂缝缓解层、不同级配OLSM-25裂缝缓解层的沥青路面进行疲劳分析,从宏观力学响应方面阐释了OLSM-25裂缝缓解层的抗裂机理。结果表明:在车辆荷载偏载作用下,与相同厚度的普通AC-25裂缝缓解层相比,采用OLSM-25裂缝缓解层可有效减缓基层裂缝的扩展速率,显著提高沥青路面结构的疲劳寿命,OLSM-25裂缝缓解层的抗裂效果优于普通AC-25裂缝缓解层。
[Abstract]:In order to solve the problem of reflection crack in asphalt surface of rigid base asphalt pavement, a method of adopting open-graded Large Stone Asphalt Mixes OLSMas as crack mitigation layer is put forward, which is based on OLSM reference gradation at home and abroad. Combined with the construction of test section, the finite element model of asphalt pavement with OLSM-25 crack mitigation layer is established by using two-dimensional finite element method. The fatigue analysis of asphalt pavement with different types of crack relief layer and different grading OLSM-25 crack mitigation layer is carried out. The anti-crack mechanism of OLSM-25 crack mitigation layer is explained in terms of macroscopic mechanical response. The results show that under the action of vehicle load bias, compared with ordinary AC-25 crack mitigation layer of the same thickness, The OLSM-25 crack mitigation layer can effectively slow down the crack propagation rate of the base course and significantly improve the fatigue life of asphalt pavement structure. The anti-crack effect of the OLSM-25 crack mitigation layer is better than that of the ordinary AC-25 crack mitigation layer.
【作者单位】：陕西交通职业技术学院公路工程系;长安大学公路学院;长安大学材料科学与工程学院;
【基金】：陕西省教育厅专项科研计划(14JK1067) 中央高校基本科研业务费专项资金项目(CHD 2010JC011)
【分类号】：U416.217

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