Estudio geofísico para el túnel de trasvase de agua del canal de riego Santiago, sector Lliglla, Km4

Abstract

Abstract: The research is based on geological and geophysical studies of the inlet and outlet of the Santiago irrigation canal water transfer tunnel, which allow the determination of the geological and geotechnical conditions of the study area. The area is composed of granodiorite rocks with a high degree of weathering and fracturing. XRD results indicate 45.9% oligoclase, 26.5% quartz, 26.0% sanidite, and 1.6% muscovite, classifying it as a granodiorite-type rock. Data obtained from geophysical profiles using Electrical Resistivity Tomography and Vertical Electrical Sounding determine resistivities ranging from 28 to 3706 ohms. Based on the results of the SUCS soil classification, the different soil types were determined, classified as SM silty sand and GM silty gravel. The data indicate a low-cohesive soil with low resistivities, mainly in the surface layer, which can cause critical areas of instability at the tunnel entrance and exit, where stabilization measures must be implemented.