Análisis de estabilidad del talud ubicado en el conjunto residencial Parques del Tunal 4, en la localidad de Ciudad Bolívar, Bogotá Colombia

Abstract

At the residential complex Parques del Tunal 4, located in the southwest of the city in the locality of Ciudad Bolívar (Bogotá, Colombia), a slope instability occurred on one of the embankments bordering the residential units. This slope has become a threat to the infrastructure and the safety of the residents due to a landslide that took place on October 23, 2024. This work proposes a slope stability analysis using the limit equilibrium method, carried out through modeling with the Hyrcan software, based on laboratory results and field samples obtained through Standard Penetration Tests (SPT). The SPT is a widely used in-situ geotechnical test to determine the strength and deformability properties of soils. These tests were conducted by a specialized laboratory contracted by the complex’s board of directors in order to determine the specific characteristics and properties of the soil, and thus perform the corresponding stability analysis and safety factor evaluation of the slope. The modeling in Hyrcan was carried out using the topographic survey taken in the field and the soil studies provided by the laboratory. The sections selected for the modeling were the most representative due to their geometry and proximity to the landslide, aiming to analyze the most unfavorable conditions for the slope. These were defined as sections 6, 7, and 8.The modeling was developed under different conditions in order to simulate the most critical possible scenario, including distributed loads from surrounding structures, the influence of the groundwater level, and the effect of seismic loads. The objective was to assess whether, under any of these conditions, the slope would lose its stability. For the numerical analysis, the most critical laboratory results were used, such as a friction angle of φ=0, which describes the resistance between soil particles under effective normal stress, based on the Mohr-Coulomb failure criterion. In other words, φ represents how much "grip"the soil has—the higher the angle, the more resistant it is to sliding. A cohesion value of 39.23 kPa was used, representing the bonding force between soil particles. The unit weight of the soil was 16 kN/m3, which refers to the weight per unit volume of the soil under saturated and normal conditions. The soil was classified based on laboratory results and according to the Unified Soil Classification System (USCS) as ÇL,"which corresponds to an inorganic clay of low plasticity. The analysis yielded an average factor of safety of 1.945, which was derived from the individual safety factors obtained for sections 6, 7, and 8 2.073, 1.901, and 1.861 respectively.