The classical failure criteria of the finite element strength reduction method were not effective in a slope stability evaluation of an earth-rockfill cofferdam in a complex hydrogeological environment.Therefore,a new criterion,the average residual displacement increment criterion,was introduced.By considering the seepage characteristics at dif-ferent water levels,based on the finite element strength reduction method,the safety factors were acquired by calculating the average residual displacement increment of the grid points on a slope face.Furthermore,through a displacement in-crement distribution contour map,the location and the formation mechanism of the potential sliding surface were dis-cussed.The results show that the new criterion is more applicable than the other three classical failure criteria for an earth-rockfill cofferdam in a complex hydrogeological environment.The research results can guide engineering practice.
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