Abstract: The bottom heave of an operating highspeed railway tunnel induces deformation of ballastless track, and further affects traffic safety. Accordingly, the driving safety control measures of highspeed railway trains are discussed and some suggestions on the prevention and remediation of tunnel floor heave are put forward based on analysis of the treatment practice process of floor heave of a highspeed railway tunnel. The main conclusions are drawn as follows. (1) The fine adjustment of track along a slope can only relieve the poor track quality caused by floor heaveinduced track deformation temporarily, but cannot eliminate it. (2) If the tunnel is open for operation with bottom heave disease, not only the maintenance workload would be greatly increased, but the operation order would be greatly affected. The optimal rectification time for floor heave is before operation. (3) The prospective and essential way to prevent tunnel floor heave lies in accurate investigation and judgment, targeted design, and strict scientific construction. The practical results show that the treatment scheme with anchoring technology for tunnel floor heave is invalid under MPalevel geostress, whereas an assistant flexiblesupported small crosssection pilot tunnel will be a possible way to prevent tunnel floor heave under large geostress.

Key words: highspeed railway tunnel, tunnel floor heave, ballastless track, railway traffic safety, track fine adjustment along slope, tunnel bottom anchoring