Micropilotes roscados en el suelo depósito Lacustre de la ciudad de Tunja

Abstract

This research studies the mechanical behavior of concrete micropiles with screw geometry against vertical load tests, which are applied in a sample of fluvial-lacustrine deposit of Tunja (Boyacá). This is to analyze and compare the friction between the floor and the shaft of the screw micropiles and the micropiles with smooth surface. For this, the author provides a type of geometry that would generate more friction between the shaft of the pile and the soil and an installation of the element in the soil similar to the screws concept. Additionally, a geotechnical investigation was carried out in the area in order to determine the soil parameters needed for this research. Subsequently, eight concrete micropiles with screw geometry and four 4 micropiles with smooth surface were constructed. These micropiles were manually inserted in the soil sample, then stress-displacement tests were performed in the field to each one of them. According to the test results it was possible to obtain stress-displacement curves, from which the maximum bearing capacity of each micropile and its displacement was determined. Thus it can be concluded that the micropiles with screw geometry, which were analized in this research, have a larger friction bearing capacity compared with micropiles with smooth surface.