Abstract Three are limitations in comprehension of reservoir landslide deformation and failure under conditions of water level decreasing. Traditionally，stress-deformation and stability analysis are based on results from seepage calculations in terms of pore water pressure treatment，and without taking into account the excess pore water pressure around slip-band zone for sluicing. Therefore，the unpractical deformation analysis and stability are obtained，which result in mistake understanding of mechanism of landslide failure. Taking the front part of Huangtupo landslide as an engineering example，the fluid-solid coupling numerical analysis is carried out under conditions of water level decreasing. The stress field，deformation field and pore water pressure field are obtained so as to probe into deformation and failure mechanism of landslide considering the double-field coupling effect. Moreover，the stability varying trends with time is obtained. Study shows that the excess pore water pressure resulting from sluicing is a significant factor inducing deformation and failure of landslide.
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Received: 06 September 2007
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