Mathematics – Logic
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003rmxac..19..109s&link_type=abstract
San Pedro Mártir: Astronomical Site Evaluation (Eds. Irene Cruz-González, Remy Avila & Mauricio Tapia) Revista Mexicana de Astro
Mathematics
Logic
Geotechnical, Site Testing
Scientific paper
The geotechnical characterization of the San Pedro Mártir (SPM), Baja California site was carried out in 2000 by the Gerencia de Estudios de Ingeniería Civil of the Comisión Federal de Electricidad (GEIC/CFE). The principal aim of the series of geological and geotechnical studies was to characterize the subsoil performance at one of the possible construction sites of a new telescope, which may also provide an idea of the characteristics of other locations at the Observatorio Astronómico Nacional in San Pedro Mártir (OAN/SPM) Sierra summit. The full report of the GEIC/CFE geotechnical study of the SPM site includes results from the topographic, geological and geophysical surveys carried out. In the present paper a review of the geotechnical study is presented and some of the important results are summarized. The study shows that the subsoil can be classified in three principal horizons or layers (A, B and C). The A-horizon consists of decompressed rock of depth 1.3 to 3.0 m, which has to be removed for the foundations. Layer B consists of fractured rock with an RQD (rock quality designation) between 65%-80%, a thickness of 10-12 m, and a high load bearing capacity. This implies that the required depth excavations for the foundation footings ranges from 2 to 3 m, where an adequate dynamic modulus of elasticity can be reached. Horizon C from 13 to 22 m, the maximum depth explored, consists of rock (gray schist) of massive nature with some granite intrusions that appears slightly fractured, with an RQD above 90%. For the electric grounding instalation the best place is layer B due to its lower resistivity.
Castellanos V.
Castilla J. E.
Díaz G. v.
Garay Francisca
Grijalva J.
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