沥青路面防水抗裂功能层缓解反射裂缝的数值分析
发布时间：2018-10-20 09:49
【摘要】：沥青路面的反射裂缝,主要是由半刚性基层无法避免的温缩及干缩裂缝导致应力集中过大而引起的,车辆荷载、较大的环境温差变化以及渗水导致反射裂缝道面破坏的不利因素。在半刚性基层和柔性面层之间设置防水抗裂功能层,可以有效缓解路面结构的应力集中现象,延缓反射裂缝的产生与扩展速度。采用有限元方法模拟易发反射裂缝的实际环境,对设置及未设置防水抗裂功能层的路面结构进行温度-荷载耦合力学对比分析,发现沥青路面下面层的荷载应力、温度应力以及应力强度因子都有较大幅度的降低,并且计算了防水抗裂功能层厚度、模量对路面结构应力、弯沉和强度因子的影响。结果表明:一般防水抗裂功能层的模量越小,效果更加明显;在合理范围内增加防水抗裂功能层的厚度能够更加有效地预防反射裂缝病害;适当控制基础模量可以防止反射裂缝的产生。
[Abstract]:The reflective cracks of asphalt pavement are mainly caused by the excessive stress concentration caused by the temperature shrinkage and dry shrinkage cracks that cannot be avoided in the semi-rigid base. The larger environmental temperature difference and the unfavorable factors of water seepage leading to the failure of reflective crack surface. Setting waterproof and crack resistant functional layer between semi-rigid base and flexible surface layer can effectively alleviate the stress concentration phenomenon of pavement structure and delay the production and expansion speed of reflection crack. Finite element method is used to simulate the actual environment of prone reflective cracks. The temperature-load coupling mechanics analysis of pavement structure with and without waterproof and crack resistant functional layer is carried out, and the load stress of asphalt pavement underlayer is found. Both the temperature stress and the stress intensity factor are greatly reduced, and the effects of the thickness and modulus of the waterproof and crack resistant functional layer on the stress, deflection and strength factor of the pavement structure are calculated. The results show that the smaller the modulus of the general waterproof and crack resistant functional layer, the more obvious the effect is, and the more effective the thickness of the waterproof and crack resistant functional layer is, the more effective it is to prevent the reflective crack disease. The foundation modulus can be controlled properly to prevent the reflection crack.
【作者单位】： 同济大学道路与交通工程教育部重点实验室;
【分类号】：U416.217
[Abstract]:The reflective cracks of asphalt pavement are mainly caused by the excessive stress concentration caused by the temperature shrinkage and dry shrinkage cracks that cannot be avoided in the semi-rigid base. The larger environmental temperature difference and the unfavorable factors of water seepage leading to the failure of reflective crack surface. Setting waterproof and crack resistant functional layer between semi-rigid base and flexible surface layer can effectively alleviate the stress concentration phenomenon of pavement structure and delay the production and expansion speed of reflection crack. Finite element method is used to simulate the actual environment of prone reflective cracks. The temperature-load coupling mechanics analysis of pavement structure with and without waterproof and crack resistant functional layer is carried out, and the load stress of asphalt pavement underlayer is found. Both the temperature stress and the stress intensity factor are greatly reduced, and the effects of the thickness and modulus of the waterproof and crack resistant functional layer on the stress, deflection and strength factor of the pavement structure are calculated. The results show that the smaller the modulus of the general waterproof and crack resistant functional layer, the more obvious the effect is, and the more effective the thickness of the waterproof and crack resistant functional layer is, the more effective it is to prevent the reflective crack disease. The foundation modulus can be controlled properly to prevent the reflection crack.
【作者单位】： 同济大学道路与交通工程教育部重点实验室;
【分类号】：U416.217
【相似文献】
相关期刊论文 前10条
1 欧阳志;;长寿命沥青路面结构研究[J];安徽建筑;2011年02期
2 丁烈梅;;透层油在沥青路面施工中的应用[J];山西交通科技;2009年01期
3 张全敏;;浅谈长寿命沥青路面[J];科学之友(B版);2009年12期
4 秦先涛;祝斯月;;基于旧水泥路面加铺层的层间功能层研究[J];武汉工业学院学报;2011年02期
5 董鹏;;沥青路面功能层现场试验研究[J];交通世界(建养.机械);2007年09期
6 张慧;路春成;王建勋;张永军;;浅谈路面层间结合层设计[J];科技信息(科学教研);2007年21期
7 李文瑛,彭波,郭永谊;高等级公路沥青层合理厚度的探讨[J];西安公路交通大学学报;1998年S1期
8 段春光;;沥青路面层间功能层施工技术[J];河南建材;2009年02期
9 钟芸;朱s，
本文编号：2282782
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2282782.html
