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加铺层厚度对冲击压实改建路面力学性能的影响
引用本文:胡玲玲,苏卫国,卢辉,钟志勤.加铺层厚度对冲击压实改建路面力学性能的影响[J].中山大学学报(自然科学版),2009,48(6).
作者姓名:胡玲玲  苏卫国  卢辉  钟志勤
作者单位:1. 中山大学应用力学与工程系,广东广州,510275
2. 华南理工大学土木与交通学院,广东广州,510640
3. 广州市公路开发公司,广东广州,510080
基金项目:国家自然科学基金资助项目,广东省交通厅科技资助项目,中山大学青年教师科研启动基金 
摘    要: 采用三维有限元方法研究冲击压实技术改建后的白加黑路面的受力机制,讨论加铺的水泥稳定基层和沥青砼面层的厚度分别对改建路面的受力性能和使用性能的影响。计算结果表明:冲击压实改建路面在轮载作用下加铺层与破裂水泥砼板块间会出现脱空,是此种路面结构所特有的工作模式;在交通荷载下,加铺的沥青砼底面较容易产生横向疲劳裂缝,从而在沥青砼面层中形成由下而上的反射裂缝,而受轮载直接作用的沥青砼表面并不容易损坏;面层所受的应力极值随加铺层厚度的增加呈线性减小;增加加铺层厚度能够明显减少由交通荷载引起的路面开裂,并且增加水稳层厚度比增加面层厚度更为经济有效;但增加加铺层厚度对改善沥青砼面层抗车辙能力的效果不显著。

关 键 词:加铺层  路面  冲击压实  力学性能  有限元
收稿时间:2009-01-01;

Influence of Overlays Thickness on the Mechanical Properties of Asphalt Pavement Based on Broken-and-Fixed Concrete
HU Lingling,SU Weiguo,LU Hui,ZHONG Zhiqin.Influence of Overlays Thickness on the Mechanical Properties of Asphalt Pavement Based on Broken-and-Fixed Concrete[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2009,48(6).
Authors:HU Lingling  SU Weiguo  LU Hui  ZHONG Zhiqin
Institution:(1.Department of Applied Mechanics &; Engineering, Sun Yat sen University,Guangzhou 510275,China; 2.School of Civil Engineering and Transportation, South China University of Technology,Guangzhou 510640,China;3.Guangzhou Highway Development Corporation,Guangzhou 510080,China)
Abstract:By employing the three-dimensional finite element method, the working mechanism of white-and-black pavement treated by impact compaction was studied, and then the influence of the overlays' thickness on the mechanical properties of the new asphalt concrete layer (AC ) was explored. The simulation results show that a gap will appear between the overlay and the broken existed concrete slab under the wheel load, which is the special working mechanism of the recovered pavement. Under traffic load the potential cracks will rise transversely at the bottom of AC, while the asphalt surface is undestroyed although it is directly suffered from the wheel load. The maximal stress in AC decreases linearly with the increase of the overlays' thickness, either AC or the cement treated base ( CTB ). The pavement cracks would be efficiently decreased with the increase of the overlays' thickness, especially with the increase of CTB's thickness. However, the effect is not evident in improving the rutting resistance of AC by increasing the thickness of the overlays.
Keywords:overlay  pavement  impact compaction  mechanical properties  finite element method
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