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Abstract Failure types of landslides generally include thrust load-caused type，retrogressive type and combined type. Stress field and displacement field were obtained based on numerical analysis and variable modulus elastoplastic strength reduction method. According to the numerical results，it is found that in thrust load-caused landslide，the displacement and the stress level of the upper region are higher than those of the lower region；while in retrogressive landslide，the displacement and the stress level of the lower region are higher than those of the upper region；and the combined landslide is the combination of those two failure types. Therefore，the failure type of a landslide can be clearly identified by its stress field and displacement field obtained from numerical method. Furthermore，anti-sliding piles were set at different sites of landslide to study the relationships between factor of safety and stress field and displacement field of landslide. It is found that setting the anti-sliding piles at the site of higher stress level and larger displacement can lead to higher factor of safety than at other places. Thus，the optimal reinforcement site is the upper region for the thrust load-caused landslide，while the lower region for the retrogressive landslide. As for the combined landslide，the optimal reinforcement site is the one of higher stress level and displacement. As a result，the optimal reinforcement site can be determined by the stress field and displacement field. These conclusions can offer more clear and reasonable reinforcement sites for engineering treatment，beneficial for the landslide treatment. At last，some typical landslides were analyzed. The results show that the above method is reasonable and feasible.
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Received: 11 April 2012
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2012, Vol. 31 
