Browsing by Author "Useche Infante, Danny José"

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    Behavior of geogrid reinforced sand under vertical load
    (GEOMATE International Society, 2016) Useche Infante, Danny José; Aiassa Martinez, Gonzalo Martín; Arrúa, Pedro Ariel; Eberhardt, Marcelo G.
    In previous works several experimental investigations aimed at establishing the behavior of granular soils reinforced with geosynthetics have been conducted. It has been found that the capacity of the soil improves due to a tensile force given by the geosynthetic that thus provides a soil reinforcement function and therefore allows a better distribution of pressure in the soil. Many of these studies report the use of CBR tests to characterize the behavior of reinforced soil. The CBR test measures the vertical deformation with application of vertical loads, by which it is possible to characterize the stress-strain behavior of the material. In this paper, modified CBR tests are performed on samples of granular soils reinforced with geogrids in order to establish the behavior of reinforced soil at the load application surface from foundations; in this case the displacements are restricted in the cylinder edges of CBR test. The results are compared with those obtained by CBR testing performed without restricting displacements at the edges and without including any type of reinforcement, which were documented in previous work of the authors.
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    Behavior of rigid circular shallow foundations on geogrid-reinforced sand
    (Oklahoma State University, 2015) Useche Infante, Danny José; Aiassa Martínez, Gonzalo Martín; Arrúa, Pedro Ariel
    This paper presents the effect of two types of geogrid inclusion on the bearing capacity of a rigid circular footing resting on sand. The improvement achieved with uniaxial and biaxial geogrids is compared. Load tests were performed for a broad series of conditions, including unreinforced cases, was tested by varying variables such as geogrid type, number of geogrid layers, depth to topmost layer of geogrid and the case when the geogrid is anchored to the test mold. The results were then analyzed to find both qualitative and quantitative relationships between the bearing capacity and the geogrid variables. The results of the investigation indicate that both, the settlement and the bearing capacity, of circular footing resting on sand, can be enhanced by the presence of geogrid layers. The improvement in stress-strain behavior of the geogrid-reinforced sand was found to be strongly dependent on the number of geogrid layers, vertical distance between the base of the foundation and the first layer of geogrid and the tensile strength of geogrid reinforcement.
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    Effect of geogrid reinforcement on interface for a stratified embankment
    (Geotech., 2016) Useche Infante, Danny José; Aiassa Martínez, Gonzalo Martín; Arrúa, Pedro Ariel; Eberhardt, Marcelo Gabriel
    Reinforced granular embankments are often placed on soft soil strata for an efficient and economical transfer of superstructure load. This paper describes laboratory tests on circular footing supported on unreinforced and geogrid-reinforced granular soil. Two types of geogrid layer, uniaxial and biaxial geogrid, were placed at the interface of sub-base soil and granular base of an embankment formed on soft ground to support shallow foundations. Load test were conducted with the aim to determine the performance improvement of the circular footing due to the provision of both types of geogrid reinforcement in the soil. Also studied the effect produced by anchoring geogrid layer at the edge of the mold sample. The results showed that the inclusion of a geogrid layer at the interface of sub-base soil and granular base increase the magnitude of the footing bearing capacity and decreases the settlement of the system. The study shows that the type of geogrid used has direct influence on stress-strain behavior of soil-geogrid system and better results occurred when the geogrid was anchored to test mold.
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    Effect of geogrid reinforcement on interface for a stratified embankment.
    (GEOMATE, 2016) Useche Infante, Danny José; Aiassa Martínez , Gonzalo Martín; Arrúa , Pedro Ariel; Eberhardt , Marcelo
    Reinforced granular embankments are often placed on soft soil strata for an efficient and economical transfer ofsuperstructure load. This paper describes laboratory tests on circular footing supported on unreinforced and geogrid-reinforced granular soil. Two types of geogrid layer, uniaxial and biaxial geogrid, were placed at the interface of sub-base soil and granular base of an embankment formed on soft ground to support shallow foundations. Load test were conducted with the aim to determine the performance improvement of the circular footing due to the provision of both types of geogrid reinforcement in the soil. Also studied the effect produced by anchoring geogrid layer at the edge of the mold sample. The results showed that the inclusion of a geogrid layer at the interface of sub-base soil and granular base increase the magnitude of the footing bearing capacity and decreases the settlement of the system. The study shows that the type of geogrid used has direct influence on stress-strain behavior of soil-geogrid system and better results occurred when the geogrid was anchored to test mold.
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    Modelo de una fundación circular a escala para medir esfuerzos en suelo granular usando celdas de cargas.
    (Universidad Tecnológica Nacional Regional Córdoba., 2018) Aiassa Martínez , Gonzalo Martín; Arrúa, Pedro Ariel; Eberhardt , Marcelo; Useche Infante, Danny José; Useche Infante, Danny José
    En este artículo se presentan los resultados de una serie de ensayos de carga realizados con un modelo de fundación apoyado en arena. El objetivo de este estudio es medir los esfuerzos verticales que se producen dentro del suelo al aplicar las cargas con la fundación. Se utilizó un modelo de fundación circular y la arena se dispuso en un tanque circular metálico, completamente rígido de 60 cm de diámetro y 45 cm de altura. Los esfuerzos se midieron con celdas de carga de diafragma. Se determinó el efecto de la densidad del suelo en la distribución vertical de esfuerzos en la arena. Los resultados mostraron que la inclusión de las celdas en la masa de suelo produjo una alteración en el comportamiento esfuerzo-asentamiento de la fundación.
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    Shear strenght behavior of different geosynthetics reinforced soil structure from direct shear test
    (Springer, 2016) Useche Infante, Danny José; Aiassa Martinez, Gonzalo Martín; Arrúa , Pedro Ariel; Eberhardt, Marcelo G.
    This paper presents the results of direct shear test on soil samples reinforced with geosynthetics, conducted with the aim of characterize the shear strength of reinforced soil composite. Two types of granular soil (well graded sand and silty sand) and four types of geosynthetic (woven and nonwoven geotextile—uniaxial and biaxial geogrid) were selected. Laboratory testing program were performed in two shear boxes, circular box with 63 mm in diameter and square box with 100 mm in length; the samples were made with loose and dense sand; the reinforcement layer was placed perpendicular to the failure surface; tests are conducted with three vertical confining pressures: 15.7, 31.4 and 62.8 kPa. The effect of different factors that influence the results of the shear tests is analyzed, such as: the particle size of soils, density of soils, shear box size and type of geosynthetics. The test results reveal that the maximum value of shear strength improvement was achieved for dense silty sand samples reinforced with biaxial geogrid. In general, the improvement was more favorable for samples reinforced with geogrid compared to samples reinforced with geotextile.