Evaluación del riesgo por movimientos en masa en el costado derecho de la vía Piedecuesta - Mesa de Los Santos, sector peaje La Punta

Abstract

Mass movement assessment analyzes landslides and similar events in high-slope terrains, evaluates the threat and vulnerability to calculate risk as the likelihood of damage. To prevent losses, the National Disaster Management System proposes three stages: risk recognition, risk reduction, and disaster management. For this project located in the Peaje La Punta sector, between Piedecuesta and La Mesa de Los Santos, a thorough mass movement assessment was conducted, with a primary emphasis on the first phase of risk recognition. Soil and rock samples were taken and studied in the laboratory, revealing sandy silt (SM) soil with high organic content and detrital rock. With geological information in hand, a risk analysis was performed. To achieve this, the threat in the study area was first determined, resulting in a high threat due to slopes exceeding 57%, as specified by Resolution 1294 of the CDMB norms, which designates slopes greater than this as a high threat. To assess vulnerability, a qualitative analysis was conducted using the Leone methodology, involving field-based building assessments and categorization based on quality and structural characteristics, yielding moderate and low vulnerability indices. Slopes were modeled using SLIDE, meeting safety factors outlined by the NSR-10 standard. To calculate the risk index, the risk index was multiplied by the failure probability provided by SLIDE, yielding a 0% risk for structures. However, considering past events in the sector, there remains existing risk categorized on a map as low, medium, high, mitigable, and non-mitigable risks.