Influencia del agua intersticial en los parámetros de resistencia al corte (triaxial UU) evaluado en 2 sitios del Distrito Metropolitano de Quito, aplicado a la estabilidad de taludes en suelos parcialmente saturados en términos de esfuerzos totales

Abstract

In civil engineering, one of the most important aspects to be taken into account in slope stability projects is part of the geomechanical characterization of the soil where the structure will be implanted. The objective of this research is to provide results in which the influence of humidity (ω) on the variation of shear strength parameters is determined: cohesion (c), friction angle (φ), in addition to the specific weight of the soil. (γ). Once the study sites were defined within the Metropolitan District of Quito, field work was carried out to extract soil blocks for the development of laboratory tests (triaxial UU and SUCS classification), to obtain the shear strength properties, index properties and soil type. Subsequently, a multiple linear regression analysis was carried out in which the reduction of the angle of friction and cohesion was determined, depending on the geomechanical parameters of the soil, humidity and plasticity index, in addition to the variation of the degree of saturation, humidity and specific weight. An analysis of variance (ANOVA) is then performed, and from these results an expression is obtained that calculates the reduction of the friction angle and cohesion as a function of humidity variation. Afterwards, a slope stability analysis was carried out using the Simplified Bishop method and integrating the resistant and acting forces from the beginning to the end of the failure circle, the safety factor was calculated and its reduction percentage was determined due to the increase in humidity.