Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/222119
Title: Assessing preferential seepage and monitoring mortar injection through an earthen dam settled over a gypsiferous substrate using combined geophysical methods
Author: Himi, Mahjoub
Casado, Ismael
Sendrós Brea-Iglesias, Alex
Lovera Carrasco, Raúl
Rivero Marginedas, Lluís
Casas Bou, Albert
Keywords: Geofísica
Tomografia sísmica
Geophysics
Seismic tomography
Issue Date: 28-Nov-2018
Publisher: Elsevier B.V.
Abstract: For several decades the Sant Llorenç de Montgai reservoir has experienced different problems that could affect the safety of the engineering structure. For this reason, several corrective actions have been taken over the years. Here, we present a study involving complementary geophysical methods including electrical resistivity tomography, seismic refraction tomography and frequency-domain electromagnetic surveys. The analysis of the inverted electrical resistivity tomography cross-sections combined with the seismic refraction results and land subsidence monitoring data show the likely mechanism of abnormal seepage. The areas where mortar injections were applied as a corrective measure are also clearly delineated. In addition, the evolution of the state of the embankment has been established from two successive electrical resistivity tomography surveys in the last two decades. The results show areas where corrective mortar injections have been effective, while in other areas new abnormal seepage has been detected. The lithological heterogeneity of the bedrock, especially the dissolution of gypsum-rich rocks, induced subsidence effects and caused abnormal seepage in different areas along the embankment. Our results indicate how corrective solutions can be optimized to reduce the cost of corrective engineering interventions.
Note: Versió postprint del document publicat a: https://doi.org/10.1016/j.enggeo.2018.10.002
It is part of: Engineering Geology, 2018, vol. 246, p. 212-221
URI: https://hdl.handle.net/2445/222119
Related resource: https://doi.org/10.1016/j.enggeo.2018.10.002
ISSN: 0013-7952
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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