Abstract: In order to study the fracture mechanism of pavement around manholes (PAM) in urban road, based on the disease investigation of PAM, the coupling vibration model of vehicle-manhole cover was established by considering the vibration and deformation of the manhole cover. The vehicle dynamic load characteristics were analyzed, and the structure model of manhole and PAM was established. The mechanical response of PAM under vehicle load was calculated, and the failure mechanism was explored. The results indicate that the failure radius of PAM fracture is generally within 1.2m; the settlement of manhole is mainly distributed in 0 ~ 10 mm, and the slope variation caused by uneven settlement of manhole is mainly distributed between -1% and 1%; the maximum clearance value of PAM is 35 mm, while that of the conventional pavement is less than 5 mm; the smoothness of PAM is much worse than that of the conventional road. The dynamic load characteristics of vehicles passing through PAM are obvious, which can reach 1.29 times of the static load. Factors such as vehicle speed, manhole settlement, PAM smoothness, uneven settlement of manhole and insufficient compaction of subgrade and PAM all have a great influence on the fracture of PAM under vehicle load.

Key words: highway engineering, pavement around manholes, impact load, settlement of manhole, mechanism of fracture

摘要： 为研究城市道路检查井井周路面破坏机理，在路面病害调查的基础上，考虑井盖的振动和变形，建立车-井盖耦合振动模型，分析车辆动载特性，建立检查井及井周路面结构模型，计算车辆荷载作用下井周路面力学响应，探究其破坏机理。结果表明：井周路面破坏失效半径一般在1.2 m以内；检查井沉降量主要分布于0～10 mm，检查井不均匀沉降导致的坡度变化主要分布于-1%～1%；井周路面最大间隙值为35 mm，常规路面最大间隙值均在5 mm以内，井周路面平整度明显比常规路面差得多；车辆经过井周路面时动载特性明显，可达静载的1.29倍；车速、检查井沉降量、井周路面平整度、检查井不均匀沉降及井周路基、路面压实不足等因素均对车辆荷载作用下井周路面的破坏有较大影响。

关键词: 道路工程, 井周路面, 冲击荷载, 检查井沉降, 破坏机理