连续配筋水泥混凝土路面裂缝发展规律研究

Research on Crack Progression of Continuously Reinforced Concrete Pavement

裂缝位置是连续配筋路面的薄弱面,裂缝间距和裂缝宽度则是CRCP配筋设计的两个控制指标。通过对不同配筋率的两段CRCP路面裂缝进行长期观测,分析归纳了CRCP路面的主要裂缝类型、裂缝形态、裂缝主要参数以及各参数的变化规律。研究发现横向裂缝是CRCP的主要裂缝形式,除了常见形态外,还出现了大量群集裂缝以及Y形裂缝。裂缝可以用裂缝间距、裂缝宽度以及裂缝长度等参数来表征,各参数随配筋率、端部锚固形式、观测气温以及时间而不断变化,相关研究结论可为今后CRCP路面实施裂缝控制技术以及CRCP的优化设计提供有益的参考。

Cracking positions are the weakest part of Continuously Reinforced Concrete Pavement, and crack spacing and crack width are the two control indexes. By long time observations to the cracks of two continuously reinforced concrete pavement with different reinforcing bar layout, the main crack type., crack formation, crack parameters and the progression law of these parameters are. analyzed. It was found that transversal cracks are the main crack type, except for the regular cracks, many cluster cracks and Y cracks were also found. Cracks can be represented by crack spacing, crack width and crack length, all these parametem vary with reinforcing bar layout, end-anchorage, observation temperature and observation time. Correlative research conclusions can supply valuable references for active crack control and optimize design of CRCP.