Criterio para determinar áreas de susceptibilidad de remociones en masa del borde costero de la provincia de Petorca, región de Valparaíso, Chile
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Fecha
2023
Facultad/escuela
Idioma
es
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Universidad Andrés Bello
Nombre de Curso
Licencia CC
Licencia CC
Resumen
El estudio se llevó a cabo en un área entre las comunas de Papudo y La Ligua, con el objetivo de
establecer una metodología para evaluar la susceptibilidad de las laderas a sufrir un evento
remoción en masa. Para tal fin, se ha considerado la evaluación de las propiedades físicas de los
materiales que conforman dichas laderas, así como también los efectos sísmicos a los que podrían
estar expuestas.
La metodología consta de tres etapas: un estudio preliminar, la recolección de datos en terreno y el
análisis de estabilidad utilizando métodos estandarizados de equilibrio límite en el software Slide
v 6.0. Se realizaron análisis estáticos, con valores de presión de poros variables y pseudoestáticos,
incorporando un coeficiente sísmico horizontal.
Según los resultados obtenidos, se determinó que las dos laderas seleccionadas para el estudio son
inestables bajo las condiciones de análisis pseudoestático. En particular, se encontró que la ladera
correspondiente al perfil 2 es inestable para el análisis estático, con un valor de presión de poros
de 0.2. Estos resultados nos indican que existe una alta probabilidad de que se produzcan
deslizamientos en esta zona. Además, se observó que el método de Janbú Simplificado, utilizado
para el análisis de la estabilidad de las laderas, fue el menos conservador de todos los métodos
evaluados en el estudio.
Finalmente, después de aplicar la metodología propuesta, se ha llegado a la conclusión de que el
área de estudio presenta una alta susceptibilidad a sufrir deslizamientos. Por lo tanto, es crucial
tomar medidas para garantizar la estabilidad de las laderas en cuestión y prevenir posibles daños a
la infraestructura y a la población local.
The study was carried out in an area between the communes of Papudo and La Ligua, with the objective of establishing a methodology to assess the susceptibility of slopes to undergo a mass removal event. For this purpose, the evaluation of the physical properties of the materials that make up these slopes has been considered, as well as the seismic effects to which they could be exposed. The methodology consists of three stages: a preliminary study, field data collection and stability analysis using standardized limit equilibrium methods in Slide v 6.0 software. Static analyzes were carried out, with variable and pseudostatic pore pressure values, incorporating a horizontal seismic coefficient. According to the results obtained, it was determined that the two slopes selected for the study are unstable under the conditions of pseudostatic analysis. In particular, it was found that the slope corresponding to profile 2 is unstable for the static analysis, with a pore pressure value of 0.2. These results indicate that there is a high probability of landslides occurring in this area. In addition, it was observed that the Simplified Janbú method, used for slope stability analysis, was the least conservative of all the methods evaluated in the study. Finally, after applying the proposed methodology, it has been concluded that the study area presents a high susceptibility to landslides. Therefore, it is crucial to take measures to guarantee the stability of the slopes in question and prevent possible damage to the infrastructure and the local population.
The study was carried out in an area between the communes of Papudo and La Ligua, with the objective of establishing a methodology to assess the susceptibility of slopes to undergo a mass removal event. For this purpose, the evaluation of the physical properties of the materials that make up these slopes has been considered, as well as the seismic effects to which they could be exposed. The methodology consists of three stages: a preliminary study, field data collection and stability analysis using standardized limit equilibrium methods in Slide v 6.0 software. Static analyzes were carried out, with variable and pseudostatic pore pressure values, incorporating a horizontal seismic coefficient. According to the results obtained, it was determined that the two slopes selected for the study are unstable under the conditions of pseudostatic analysis. In particular, it was found that the slope corresponding to profile 2 is unstable for the static analysis, with a pore pressure value of 0.2. These results indicate that there is a high probability of landslides occurring in this area. In addition, it was observed that the Simplified Janbú method, used for slope stability analysis, was the least conservative of all the methods evaluated in the study. Finally, after applying the proposed methodology, it has been concluded that the study area presents a high susceptibility to landslides. Therefore, it is crucial to take measures to guarantee the stability of the slopes in question and prevent possible damage to the infrastructure and the local population.
Notas
Tesis (Geólogo)
Palabras clave
Riesgo Geológico, Remociones en Masa, Estabilidad, Modelos Matemáticos, Chile, Petorca