Análisis de susceptibilidad a movimiento de tierras, tramo inicial de la conducción Labrado-Tuñi

Abstract

The Labrado-Tuñi canal transports water for power generation at the Machángara hydroelectric complex, owned by ELECAUSTRO. Historically, there have been episodes of instability of the nearby slopes, which have reduced the flow transported and decreased the efficiency of energy production. The objective of this study is to elaborate maps of susceptibility to landslides in the first section of the canal, between abscissae 0+000 and 3+000, applying the Mora-Vahrson methodology and Analytical Hierarchy. The information required for the analysis methods was obtained from institutions such as SENAGUA and ELECAUSTRO, complemented with field visits. Characterization tests were carried out on the soils and rock massifs present. Soil types SM and GM were determined according to the SUCS; for the rocky outcrops, a RMR and a SMR class III were determined, i.e., medium quality rock. A Markland analysis identified that there is no risk of flat failure or Toppling in them. Prior to obtaining the maps, adaptations were made in the lithological layer, based on the results of the tests on soils and rock massifs. The maps revealed differences between both methodologies, being the Analytical Hierarchy more accurate in the zoning of the study area and in the distribution of the weights of the variables according to their relevance. It was observed that most of the area has high susceptibility and that slope is the most influential factor. The susceptibility levels were compared for different rainfall periods.