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Abstract Generally，material parameters are assumed as constant in stability analysis of reservoir bank；it is inconsistent with the fact that material parameters would vary with change in saturation state as change in water level. The precision of calculation is limited；thus safety judgment of bank is influenced. Based on theory of unsaturated soil mechanics and principle of effective stress，not only material parameters are assumed as the function of saturation，but also the model of unsaturated liquid-solid coupling is introduced to numerical analysis of bank stability. Taking landslide No.1 at the bank of Xiaolangdi Reservoir for example，several works such as change in water level，rainfall，earthquake，etc. are carried out as well as the contrast of correlative results are worked out. Study shows that results of the model of unsaturated liquid-solid coupling are consistent with the fact basically；thus the model can be used to analyze the stability of reservoir bank. Moreover，material parameters defined as the function of saturation state，soak process of soil can be described better. Finally，relative to limit equilibrium method，not only constitute relation of stress and strain about material can be considered，but also results of seepage，stress，displacement，etc. can be achieved with the finite element method；thus it will be applicable to stability analysis of bank. The research results can be used as reference for safety evaluation and prevention and treatment of reservoir banks.
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Received: 12 November 2010
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2011, Vol. 30 
