At present

there is no unified surface settlement rule and controlled criterion for the settlement induced by railway tunnel undercrossing highway

which is researched only based on an actual project. From the aspects of longitudinal-transverse slope

smoothness

and requirements for stability of highway

the requirements for smoothness are adopted to control road surface uneven settlement during construction. According to embankment height

tunnel size

depth

geology

construction method

construction process of single and dual-lane railway tunnels undercrossing highway is simulated by FLAC software. The rule of road surface settlement is studied. In addition

the width coefficient of settling tank and prediction model for the largest settlement are obtained. Based on them

pavement surface settlement controlled criterion is established for railway tunnel undercrossing highway. At the same time

the rationality of controlled criterion is verified through several case studies. The results can provide reference for establishment of pavement surface settlement controlled criterion for railway tunnel undercrossing surface buildings.