Abstract: Based on an indoor physical simulation test and FLAC numerical simulation method, changing regulations of pore water stress and total stress of roadbed along reservoir or river are studied in the dynamic fluctuation of river or reservoir water level. And the results of the two methods are congruous. It’s been proved that when water level rises, the whole changing trends of water stress and total stress are both increasing, but the increasing value of earth stress is smaller than that of water stress. So the effective stress is decreasing. When water level falls, total stress is decreasing, but water stress is decreasing greatly. So the effective stress was increasing. Meanwhile, the method of FLAC numerical simulation can better study the regulation of data and get the continuity of data. Therefore, FLAC finite difference method can be effectively used to simulate the changing conditions of stress field and seepage field of roadbed along reservoir or river under different hydraulic boundary conditions.

Key words: roadbed along reservoir or river, physical simulation test, FLAC numerical simulation, pore water stress, total stress, effective stress