Construction of deep tunnel shafts in Mexico city soft clays by the flotation method |
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| Authors: | Gabriel Auvinet-Guichard Juan F Rodríguez-Rebolledo José L Rangel-Núñez |
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| Institution: | 1.Instituto de Ingeniería,Universidad Nacional Autónoma de México,México DF,Mexico;2.Universidad Autónoma Metropolitana,México DF,Mexico |
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| Abstract: | The drainage system of Mexico City, one of the largest metropolitan areas in the world, is formed by a large network of interceptors
and collectors leading to the main outlet: a 49.3-km-long tunnel with a 6.5 m diameter. To build the access shafts to the
tunnels of the system and the deep sumps of the pumping stations in the very soft clays of the lacustrine area of Mexico valley,
a technique known as “flotation method” has been commonly used since 1969. The paper presents the main construction steps
followed and some aspects of the analysis and design of shafts constructed by this technique. The experience gained obtained
after more than 30 shafts have been constructed by this method, and the actual trends in its application are also discussed. |
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