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Abstract The favorable influence of friction resistance，caused by the deformation of the concrete plug，is generally ignored in the design of plug for diversion tunnel，which makes the length of the plug over-conservative. In accordance with the working mechanism of plug，the formula of resistance is deduced. Then a real project case is taken to verify that the safety factor can be improved and the design length of plug can be decreased considering the resistance under some conditions，such shortening the construction period and reducing investment.
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Received: 28 May 2002
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