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Abstract Based on graph theory，investigation of the most dangerous sliding surface and safety coefficient calculation in slope stability analysis is transformed into solution of shortest path problem in mathematics. The dynamic programming algorithm is improved to build a limit equilibrium finite element method(FEM)，in which the basic equation is given and the stress along the sliding surface is computed so as to avoid the computing iterative procedure because of given safety coefficient when auxiliary function is introduced. Then the improved method is applied to analyze the stability of landslide deposit at left bank，Xiluodu hydropower station. The safety coefficient is estimated based on the fracture appearance，landslide development and creep deformation under nature condition，then the deformation and failure mechanism is studied. According to monitoring data of hole with clinometer. The sliding surface of limit equilibrium finite element method is compared with reality，so the accuracy of this improved method is verified and stability under rainfall condition is discussed. At last，a analysis procedure is put forward based on limit equilibrium FEM，which is proved more suitable for stability analysis of deposit landslides.
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Received: 11 April 2012
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2012, Vol. 31 
