SAFETY VALUATION ON CONSTRUCTION OF SHIELD ACROSS THE WATERY FAULT UNDER NANJING XUANWU LAKE
南京玄武湖下盾构过富水断裂施工的安全性评价

The problem about the construction of shield menaced by confined water in prefound base rift across soft strata under the lake has not been reported. The extent of the floor strata disturbed by shield constructing under Nanjing Xuanwu Lake is calculated. The shield with balance of earth and water is fixed to make it safe to construct 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.