Abstract：According to the principles of similar models，the failure characteristics of a tamped filled-soil slope under continual rainfall of 7 days and strong rainfall of 2 hours later are studied by indoor experiments in a large experiment box，and the result is compared with that without rainfall. The failure modes of the slope before and after rainfall are discussed. It is pointed out that the tamped filled-soil slope takes the combined failure mode of plane and convex camber before rainfall and takes the combined failure mode of plane and catenoid after rainfall，and both of them are complicated failure modes. So it is unreasonable to analyze the stability and design the support parameters with the arc failure mode.
