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Abstract By using numerical method，the stress distribution can be reasonably obtained，but it is not easy to obtain the factor of safety. With limit equilibrium method，the factor of safety can be readily derived，but its precision is limited due to over-assumptions. From the stress field by numerical analysis，the normal stress distribution over the potential slip surface is calculated，with which the factor of safety is satisfied with the whole equilibrium conditions by using the method of normal stress modification. Such a limit equilibrium method based on numerical stress takes full advantages of the numerical analysis and the limit equilibrium with theoretically yielding more reasonable solution for the factor of safety. This method has been applied to the stability analysis of the deep foundation of Wudu reservoir dam and the computational results are shown to be satisfactory by comparison with the conventional limit equilibrium method and the strength reduction FEM，which has been adopted in the design of dam foundation treatment.
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Received: 09 June 2009
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