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This article presents the stability assessment of a tunnel shaft designed with the flotation method during construction stage (short term behavior) by analytical and numerical methods, projected in the lacustrine soils of Mexico City. The ultimate and serviceability limit states were reviewed in accordance with the requirements included in the Manual of Civil Works published by the CFE. For short-term behavior, the following conditions were evaluated: panel stability, ring trench stability, core stability, general stability and stability against uplift forces by pore water pressure and buoyancy, in addition, the horizontal displacements in the slurry wall are presented. Likewise, the geotechnical characterization, definition of the geotechnical models and the general characteristics of the tunnel shaft are described.
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