| 摘要: |
| 为了防止水泥混凝土路面沥青混凝土功能层在车辆荷载作用下发生剪切破坏或过大的永久变形，采用自主开发的沥青混凝土功能层累积变形测试装置，对沥青混凝土功能层在重复荷载作用下的剪切变形性能进行了研究，并采用灰关联分析理论对其影响因素进行了分析.结果表明：沥青混凝土功能层累积变形测试装置能较好模拟沥青混凝土功能层实际受力状态，在重复荷载作用下，该功能层的累积变形均呈对数增长，试件一侧产生明显的累积变形；累积变形在30mm以下的试件，只是发生了变形、翘曲等现象，而发生内部压碎、断裂的试件，累积变形均在35mm以上；沥青混凝土功能层累积变形受沥青用量的影响最大，其次是矿料级配，空隙率影响最小；试验前后试件的侧向挤出变形大于压密作用导致的试件体积减小的变形，沥青混凝土功能层产生累积变形的主要原因是接缝处面板的剪切推挤作用，而非压密作用. |
| 关键词: 道路工程 水泥混凝土路面 功能层 重复荷载 剪切变形 |
| DOI：103969/j.issn1007 9629201503010 |
| 分类号: |
| 基金项目:交通运输部西部交通建设科技项目（200631800005）；国家自然科学基金资助项目（51208047,51208046）；教育部博士点基金资助项目（20130205110013）；中国博士后基金资助项目（2013M532005,2014M552397）；长安大学中央高校基本科研业务费专项资金资助项目（2013G3312018,2014G1311081）；河北省交通科技项目（T 2012107，Y 2012014） |
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| Shearing Deformation Performance of Asphalt Concrete Function Layer in Cement Concrete Pavement |
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HE Rui1, CHEN Shuanfa1, HU Miao2, CHEN Huaxin1, SHENG Yanping1
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1.School of Materials Science and Engineering, Changan University, Xian 710061, China;2.School of Highway, Changan University, Xian 710064, China
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| Abstract: |
| To prevent shear fracture or excessive permanent deformation of the asphalt concrete function layer in cement concrete pavement under vehicle loads, the self developed accumulative deformation test device was adopted to study the shearing deformation properties of function layer asphalt concrete under repeated loads. The influence factors of permanent deformation were analyzed using grey relation analysis. Results show that the accumulated deformation test device of functional layer can simulate the practical stress state of function layer reasonably and the cumulative deformation of function layer rises in the form of logarithmic curve. Deformation and warping happen to the specimens when the cumulative deformation is smaller than 30mm, while crushing and fracture are generated in the specimens with the cumulative deformation is larger than 35mm. Asphalt content has the most important effect on the accumulated deformation of asphalt concrete function layer, followed by aggregate gradation and void ratio. The lateral extrusion deformation of the specimen is greater than the decrease of volume due to compaction effect. Therefore, the main reason of the accumulated deformation of asphalt concrete function layer is the shearing action of the panel near the joint, rather than the compaction effect. |
| Key words: road engineering cement concrete pavement function layer repeated load shear deformation |
