It is very important for pavement engineers to know which factors are the main reasons for the damage of the paving around manholes. Based on the investigation on the damage of paving around manholes, a vibration model with multidegree of freedom for the vehicle-manhole cover was established and analyzed. After that, the Matlab software was used to obtain the variation law of impact load over time, and the 95% fourth power of the aggregate force was used as the index to evaluate the pavement damage. Finally, many influencing factors on pavement damage were analyzed by the method of grey correlation entropy. The results indicated that the impact load reached the maximum for the first time when the vehicle reached the top of the manhole cover, which was 1.29 times that of the static load, and the pavement damage coefficient was 2.12 times that of the static load. The influencing factors had different degrees of influence on the pavement damage; from large to small, they were change of road longitudinal slope > driving speed > damping of tire > stiffness of tire > height difference from the pavement damage > height difference from the manhole settlement > stiffness of the manhole cover.

中文翻译：

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车辆动载荷作用下人孔周围铺面的破坏评估

对于路面工程师来说，了解哪些因素是造成沙井周围路面破坏的主要原因非常重要。在对人孔周围铺面破坏进行调查的基础上，建立并分析了人孔盖多自由度振动模型。之后，使用Matlab软件获得冲击载荷随时间的变化规律，以合力的95％的四次方作为评价路面破坏的指标。最后，通过灰色关联熵分析了影响路面破坏的许多因素。结果表明，当车辆到达人孔盖顶部时，冲击载荷首次达到最大，是静载荷的1.29倍，路面破坏系数为2。是静态负载的12倍。影响因素对路面破坏的影响程度不同。从大到小，它们分别是：道路纵向坡度的变化>行驶速度>轮胎的阻尼>轮胎的刚度>路面损坏引起的高度差>人孔沉降引起的高度差>人孔盖的硬度。