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.