关键词: 道路工程, 井周路面, 冲击荷载, 检查井沉降, 破坏机理

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