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Abstract The influence of deflection angles of seismic force on slope stability is great in analysis of slope stability. However，the horizontal direction of seismic force is not the critical direction of seismic force. How to solve seismic force and to calculate the slope stability is worthy to be studied. Aiming at that the pseudo-static method in present standard takes the horizontal direction as the action direction of seismic force，the calculation method considering the critical direction of seismic force is put forward. Taking the imbalance thrust force method as an example，the rigid limit equilibrium method considering seismic force is improved and applied to stability evaluation of Taoshugou landslide，which is located in Gaoyang town，Xingshan County in the Three Georges reservoir area. The result shows that the included angle between the critical direction of seismic force and the horizontal plane is 7.8°and directs to the out of the slope. The safest direction is 187.8°. The stability factor of Taoshugou landslide is less than 0.9 under 175 m reservoir water level and earthquake with magnitude 6. Thus Taoshugou landslide is unstable and needed to be urgently prevented.
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Received: 20 April 2007
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