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Abstract In most cases，the slip surface is a 3D surface in practical engineering. Therefore，it is not in accord with the practical condition to study the slope stability by using the traditional 2D analysis method. The Morgenstern-Price limit equilibrium method，which is the most rigorous method of 2D slope stability analysis，is developed and introduced to the 3D slope stability analysis. Through the assumptions similar to Morgenstern-Price method on slice forces，a new approach to three-dimensional slope stability analysis，the three-dimensional limit equilibrium method based on Morgenstern-Price method，is established. Two examples are given to verify the proposed method. Comparing with several other 3D slope stability analysis methods，the proposed method is more reliable and the proposed mechanical model is more rigorous. Furthermore，the proposed calculation formula is simple and easily to be programmed. The proposed 3D slope stability analysis method can be widely used by geotechnical engineers in the design of slopes and treatment of landsides.
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Received: 05 March 2010
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