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Firstly,the common design principles for diversion tunnel plug are generalized,and two kinds of numerical analysis methods are discussed.Then the strength reduction FEM is introduced in numerical model analysis and the design steps of the plug’s length are illustrated.During the progress to determine the plug’s length,the equivalent plastic strain on the potential slip surface is assumed as the flag to tell the failure against sliding,and the plug stability is overall estimated from the plastic zone range and connectivity.
Firstly, the common design principles for diversion tunnel plug are generalized, and two kinds of numerical analysis methods are discussed.Then the strength reduction FEM is introduced in numerical model analysis and the design steps of the plug’s length are illustrated. the plug’s length, the equivalent plastic strain on the potential slip surface is assumed as the flag to tell the failure against sliding, and the plug stability is overall estimated from the plastic zone range and connectivity.