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The regional subsidence of the Lake Zone of the valley of Mexico affects the city subway system, and in particular, the Guelatao-Los Reyes portion of Line “A”. In this site, soils with contrasting properties are found: hard soils associated to the presence of hills and mountains, and soft soils, mainly the clays of the Lake Zone. The paper presents different geotechnical features of the site and a brief description of the subway box-type concrete structure. The irregular settlements of the subsoil along the line have produced different types of damages on the structure. A simple methodology for modeling the soil-structure interaction effects on this site is presented. In this analysis the structure is represented as a continuous beam with elastic properties using the Finite Element Method. The longitudinal settlement profile of the soil is represented by a Fourier series. It is concluded that harmonics with relatively short periods (less than 100 meters) are the most pernicious for the structure of this system.
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