Modelación de presas de tierra considerando la mecánica de suelos no saturados. Préstamo zona de Ciego de Ávila
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Fecha
2018-06
Autores
González Rodríguez, Greisy
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Editor
Universidad Central “Marta Abreu” de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
La mecánica de suelos realiza un análisis de estabilidad de taludes en presas de tierra, encaminada solamente a los suelos saturados, favoreciendo así el lado de la seguridad, aunque los suelos parcialmente saturados aportan resistencia durante los diferentes estados de carga su estudio no es profundo. En esta investigación, se incorporan los principios de la mecánica de suelos parcialmente saturados a los análisis de estabilidad de taludes realizándose un estudio del comportamiento del factor de seguridad para cortinas con alturas de 30m y 40m respectivamente, durante las etapas de final de construcción y explotación, sin tener en cuenta la anisotropía del material. Para la modelación se utilizaron los componentes SIGMA/W, SEEP/W y SLOPE/W del software GeoStudio 2007. Los métodos de equilibrio límite empleados para la obtención de los factores de seguridad son Fellenius, Bishop, Janbu, Morgenster-Price y Spencer, se utilizan la curva característica y de conductividad hidráulica del suelo de Venezuela de la provincia de Ciego de Ávila, así como sus parámetros de resistencia obtenidos mediante los ensayos de Corte Directo y Triaxial, y corregidos a través del ajuste de Vanapalli para grados de saturación de 100%, 98%, 92% y 85%. La geometría de la presa está determinada a partir de los criterios de dimensionamiento para las condiciones de Cuba y afín a las obras de este tipo existentes en el país.
Soil mechanics performs an analysis of stability of slopes in earth dams, aimed only at saturated soils, thus favoring the safety side, although partially saturated soils provide resistance during the different load states. Their study is not deep. In this research, the principles of the mechanics of partially saturated soils are incorporated to the stability analysis of slopes, carrying out a study of the behavior of the safety factor for curtains with heights of 30m and 40m respectively, during the final stages of construction and exploitation. , without taking into account the anisotropy of the material. For the modeling, the SIGMA / W, SEEP / W and SLOPE / W components of the GeoStudio 2007 software were used. The limit equilibrium methods used to obtain the safety factors are Fellenius, Bishop, Janbu, Morgenster-Price and Spencer, the characteristic curve and hydraulic conductivity of the Venezuelan soil of the province of Ciego de Ávila are used, as well as their resistance parameters obtained by the Direct and Triaxial Cut tests, and corrected through the Vanapalli adjustment for saturation degrees of 100%, 98%, 92% and 85%. The geometry of the dam is determined from the sizing criteria for the conditions of Cuba and related to the works of this type existing in the country.
Soil mechanics performs an analysis of stability of slopes in earth dams, aimed only at saturated soils, thus favoring the safety side, although partially saturated soils provide resistance during the different load states. Their study is not deep. In this research, the principles of the mechanics of partially saturated soils are incorporated to the stability analysis of slopes, carrying out a study of the behavior of the safety factor for curtains with heights of 30m and 40m respectively, during the final stages of construction and exploitation. , without taking into account the anisotropy of the material. For the modeling, the SIGMA / W, SEEP / W and SLOPE / W components of the GeoStudio 2007 software were used. The limit equilibrium methods used to obtain the safety factors are Fellenius, Bishop, Janbu, Morgenster-Price and Spencer, the characteristic curve and hydraulic conductivity of the Venezuelan soil of the province of Ciego de Ávila are used, as well as their resistance parameters obtained by the Direct and Triaxial Cut tests, and corrected through the Vanapalli adjustment for saturation degrees of 100%, 98%, 92% and 85%. The geometry of the dam is determined from the sizing criteria for the conditions of Cuba and related to the works of this type existing in the country.
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Palabras clave
Curva Característica, Factor de Seguridad, Grado de Saturación, Suelos no saturados, Presas de Tierra, Characteristic Curve, Safety Factor, Degree of Saturation, Unsaturated Soils, Earth Dams