The stability of the permanent shiplock slopes is among the key issues in the design and construction of the Three Gorges Project. The attention of this paper is paid to the stability analysis of the permanent shiplock slopes under the seismic action. The seismic load is considered as a quasi-static force, and the stability analysis of the slopes is carried out by means of an upper bound limit analysis based on rigid elements. The problem of finding the minimum value of the critical seismic coefficient can be set up as a linear programming problem and solved by a revised simplex method.
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