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以干线公路半刚性基层沥青路面产生的水平裂缝为研究对象,采用力学分析软件计算在标准轴载和超载作用下的力学响应。通过对路面结构层应力应变特性及最大剪应力随深度变化特点分析,结合路面实际破坏现象,揭示了干线公路半刚性基层破坏的根本原因在于:沥青面层薄,高剪应力区位于半刚性基层上,半刚性基层竖向受剪超过其抗剪强度就产生水平裂缝。为提高半刚性基层疲劳寿命,避免路面早期病害,应采取如下措施:结构层中沥青路面厚度至少提高到12cm,施工中基层应采用一次压实成型,形成整体性好的高性能半刚性基层,同时养生期严格控制车辆通行。
Taking the horizontal cracks in the semi-rigid base asphalt pavement of the main highway as the research object, the mechanical response of the semi-rigid base asphalt pavement under the influence of standard axle load and overload is calculated by mechanical analysis software. Based on the analysis of the characteristics of stress and strain and the change of maximum shear stress along with the depth of the pavement structure and the actual failure phenomenon of the pavement, the fundamental reasons for the damage of the semi-rigid basement of the main highway are revealed as follows: the asphalt pavement is thin and the high shear stress zone is located in the semi- The vertical shear of the semi-rigid base exceeds the shear strength to produce a horizontal crack. In order to improve fatigue life of semi-rigid basement and avoid early disease of pavement, the following measures should be taken: Asphalt pavement thickness in structural layer should be increased to at least 12cm. During construction, primary compaction should be used to form high-performance semi- At the same time health period strictly control traffic.