Abstract The problem about the const ruction of shield menaced by confined water in prefound base rift across soft
st rata under the lake has not been reported. The extent of the floor st rata disturbed by shield const ructing under
Nanjing Xuanwu Lake is calculated. The shield with balance of earth and water is fixed to make it safe to const ruct
tunnel. An analysis is made on the geological mechanism , and the corresponding comprehensive criterion is found
to forcast water irruption in floor with the laws of Ritz and principle of virtual work.
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Received: 08 September 2000
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