旧水泥混凝土路面沥青加铺层反射裂缝破坏机理与防治措施分析

Analysis on the Failure Mechanism and Prevention Measures of Reflective Cracks in Asphalt Overlay on Old Cement Concrete Pavement

目前加铺沥青法因效果好、施工方便、对交通影响小等特点,被广泛应用于国内外旧水泥混凝土路面修复与改造工程中,而反射裂缝是旧水泥混凝土路面沥青层加铺结构中最主要的破坏形式。因此,文章在分析反射裂缝的概念和扩展模式的基础上,结合反射裂缝破坏机理,采用ABAQUS软件对沥青加铺层进行三种工况下的数值分析。依据破坏机理,综合分析沥青加铺层反射裂缝的三种常见防治措施,推荐设置土工合成材料夹层的办法,为沥青加铺层的反射裂缝防治提供理论依据与有效措施选择。

At present, the asphalt overlay method is widely used in the repair and reconstruction of old cement concrete pavement at home and abroad because of its good effect,convenient construction and little impact on traffic, while the reflective crack is the most important failure form in the asphalt overlay structure of the old cement concrete pavement.Therefore, based on the analysis of the concept and expansion mode of reflective cracks, combined with the failure mechanism of reflective cracks, the numerical analysis of asphalt overlay under three working conditions is carried out by ABAQUS software. According to the failure mechanism,three common prevention measures of reflective cracks in asphalt overlay are analyzed, and the method of setting geosynthetics interlayer is recommended to provide theoretical basis and effective measures for the prevention of reflective cracks in the asphalt overlay.