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Abstract Based on two typical dam foundation models of gravity dams，the stability of the dam against sliding is analyzed by finite difference strength reduction method. The results obtained by this method are compared with those obtained by general Sarma¢s method；and they accord with each other well. It shows that the strength reduction method is applicable to the gravity dam stability analysis against sliding. Two criteria that identifying the limit state of strength reduction method are presented and compared. Results show that for the polygonal sliding surface，the criterion that determines whether or not the localized plastic zone breaks through completely is quite conservative，however，the criterion that identifies whether or not the displacement of the key point on the slip surface changes abruptly may give a perfect result，which is accordance with that obtained by limit equilibrium method.
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Received: 29 September 2007
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