Stress-strain analysis of works remediation implemented to stabilize the mining subsidence under La Inmaculada School, Zaruma-Ecuador.

Abstract

Four stress-strain are established that demonstrate the instability process and remediation work, in relation to the subsidence and collapse event of the land where the school the was established “La Inmaculada” (Zaruma-Ecuador). Longitudinal profiles were used in direction of the use “Tres Reyes” vein, where the geological-structural model that serves as basis for strains calculation in the mining galleries around their plastic behavior. The modeling was necessary to determine; the infrastructure dead load, pseudo-static loads, groundwater position, physical -mechanical-elastic parameters of the rock matrix and discontinuities that together define the stress and deformation behavior by the finite elements method numerical (FEM). It designed an optimized mortar with cement (C): two tailings (T) at 1:2 and 0.49 water ratio (W)/cement (C), obtaining a resistance of 18 MPa after fourteen curing days. Finally, it is verified that the fill application in paste inside the galleries surrounding the collapse zone, the strain rock substrate decreases from 1.9 m (scenario two: empty cone) to 0.05 m (scenario four: pulp fill).