Analysis of the effect of wetting on the stability of a side slope of the Grijalva River, in the state of Tabasco
During the rainy season in the Mexican state of Tabasco there are landslides over the rivers that flow through the state, being some of the most affected area the one called ¨La Manga¨. This paper presents the stability analysis evolution of the side slope due to changes over the soils saturation that forms it, going from safety condition to failure condition. In order to achieve this goal, a campaign of field exploration and laboratory tests was first carried out, which allowed obtaining the geometric characteristics of the side slope, as well as the soil properties that constitutes it. From the undisturbed samples obtained in the exploration field, triaxial compression tests were carried out, varying only the degree of saturation of the soil. With the information obtained and through the GeoSlope 2012 software, stability analyses were performed varying only the degree of saturation. The results show that as the degree of saturation increases, the stability of the board decrease. It was found that exceeding 70% degree of saturation implies a slip hazard condition. Therefore, the monitoring of the soil degree of saturation that constitutes side slopes allows to anticipate its failure and, consequently, makes it possible to establish prevention actions.
Keywords: side slope; cohesion; stability; safety factor.