This study describes the method of discontinuous and anchored machine bored piles. The main advantage of this method is its faster and safer execution in comparison with hand-dug piles (rectangular section), the most widely used method for soil retaining in the gravel of Santiago. This paper shows the results of displacement versus height obtained by a numerical modeling (software Plaxis 2D), in the case of anchored machine bored piles used for the construction of the Faculty of Physical and Mathematical Sciences, Universidad de Chile. As part of monitoring of excavation, measurements of displacements were obtained for two piles at different stages by preinstalled inclinometers in the piles. Furthermore, the study shows the results for the displacement using rod construction module (software GGU-Retain), and through Winkler's theory (software CYPE: Embedded retaining walls), considering the most representative stages and the redistribution of soil pressure that is indicated in the Chilean Norm NCh.3206 for the model done on GGU-Retain. The results of the performed modellings are graphically compared with the measured field values.Key words: Discontinuous bored piles, anchored bored piles, gravel of Santiago, retaining structure, displacements versus depth.
ResumenEn este estudio se describe el método de entibación de pilotes anclados y discontinuos. La ventaja principal de este método es la mayor rapidez y seguridad en su ejecución en comparación con las pilas ancladas (sección rectangular y excavadas manualmente), método más usado para entibaciones en la grava de Santiago. En este artículo, se entregan los resultados de desplazamiento versus altura obtenidos por medio de una modelación numérica (software Plaxis 2D), para el caso de los pilotes de entibación del edificio de la Facultad de Ciencias Físicas y Matemáticas de la Universidad de Chile. Como parte del monitoreo de la excavación, se realizaron mediciones de desplazamiento en diferentes etapas para dos pilotes, obtenidas por medio de inclinómetros instalados previamente en los pilotes. Además, se incluyen los resultados para el desplazamiento obtenidos usando un sistema de vielas (software GGU-Retain) y un modelo de fuerza-deformación de Winkler (software CYPE: Muros Pantallas), considerando las etapas más representativas y la recomendación de redistribución de empujes de la norma chilena NCh.3206. Los resultados de las modelaciones realizadas son comparados de forma gráfica con los valores medidos en terreno.Palabras clave: Pilotes discontinuos, pilotes anclados, grava de Santiago, estructura de contención, desplazamiento versus profundidad.
The main purpose of this study was to model the response of piles during a lateral load test conducted at RPC in Concón in 2006 by using simplified theoretical methods and the software Plaxis 2D, Cype, and GGU-Latpile. The piles were the longest built in Chile at the time of the test. This article contains the test description, a geotechnical characterisation and the theoretical fundamentals that support the different methods used for modelling the test. The results of the different models are also presented here. It is concluded that results obtained by simplified methods may be efficient in the early stages of a project and that accurate approximations can be achieved by using design software for continuous elements in the design of isolated elements.
La interacción entre la tecnología y el diseño ha jugado un papel preponderante en la evolución de los sistemas de pilotaje. Es precisamente esta interacción la que permite que la popularidad del sistema CFA (Continuous Flight Auger) comenzara a aumentar a fines de la década de los ochenta.
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