The variation of water level caused by the impoundment of approach channel for navigation and reservoirs flood relief, will lead to a changing of the water level outside the bank slope and the pore water pressure field inside the slope which handicapped the stability of bank slope. In this paper, ABAQUS finite element software considering the stress-seepage coupling was employed to figure out the influence of variation of water level on the stability of cement shear wall reinforced approach

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... nel side slope, in combination with the strength reduction technique. As a result, the key factors affecting the stability of the reinforced side slope include the velocity of change of channel water level, height of the channel water level, the time effect of pore water pressure inside slope and the permeability coefficient of cement-soil reinforced area. In a practical engineering, it is crucial to check the most dangerous working condition, and measures to optimize the cement-soil reinforced slope structure were proposed which can provide a reference for engineering practices. Keywords: unsaturated soil, seepage, stability analysis of side slope, strength reduction finite element method.