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Abstract Conventional sensitivity analysis methods for slope stability are based on deterministic calculation，which can only determine the sensitivity of slope stability on individual variable，the sensitivity of slope stability on the same parameter along the different slip surfaces can not be analyzed. A new sensitivity analysis approach for slope stability is proposed based on reliability analysis method；the random field model is employed in simulating spatial variability of rock or soil property along the slip surface. The proposed approach is implemented using First Order Reliability Method(FORM) with constraint optimization approach. The sensitivity analysis results include minimum reliability index of slope，probabilistic critical slip surface and sensitivity factors along the critical slip surface. The sensitivity factors of same rock or soil property to slope stability at different positions along the slip surface can be obtained，which are always varied along the slip surface with the relative dimension of slope size and the scale of fluctuation of rock or soil property. The analysis results can play an important role in slope design and reinforcement：according to the sensitivity factors of rock or soil property along the slip surface，the reinforcement measures should be placed in the most sensitive position in order to improve the stability of the slope more effectively，which has advantages over the conventional sensitivity analysis approach.
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Received: 13 May 2010
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2010, Vol. 29 
