Análisis tenso – deformacional del macizo rocoso, para estimar su estabilidad en la intersección del túnel de carga con ventanas de acceso, en el Proyecto Hidroeléctrico Delsitanisagua 180 MW

Abstract

From geomechanic classification of the massif in the study zones using the RMR 89 method, we work with the GSI index which helps us to calculate the resistance of mass and geomechanical parameters cohesion and friction (more in line with actual values considering the depth of the excavation), and in this way to adjust the pressures induced to mathematical models that consider the geomechanical parameters mentioned. Safety factors obtained quantify the stability of excavations regardless of any support. Safety factors obtained quantify the stability of excavations regardless of any support. In the four intersections elevate safety factors vault was obtained, values greater than 2.5 which is regarded as long-term stability. Moreover at the two stations in the subhorizontal tunnel factors vault around 0.8 was obtained where actually observed over-excavation and strong support, in gables safety factors are stable range 1˂FS˂2.5 except intersection of four window where its factors are 0.77˂FS˂ around 0.99.