Evaluation of Load Capacity of Stratified Soils (2 Layers) by Means of Numerical Analytical Comparison

Revista Facultad de Ingeniería

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Title Evaluation of Load Capacity of Stratified Soils (2 Layers) by Means of Numerical Analytical Comparison
Evaluación de capacidad de carga de suelos estratificados (2 estratos) mediante comparativa analítica-numérica
 
Creator Quintero-Chamorro, Jairo Alejandro
Martínez-Ortega, Brayan Julián
Cruz-Velasco, Lucio Gerardo
 
Subject Stratified soils
load capacity
numerical modeling
APM
imaginary foundation
Terzaghi method
finite elements
FEM
Suelos estratificados
capacidad de carga
modelación numérica
APM
zapata imaginaria
método de Terzaghi
elementos finitos
FEM
 
Description The methods for determining load capacity in stratified soils are numerous and differ in their methods and results. These differences in analysis lead to uncertainty in engineering practices or over-dimensioning of the foundation solution. This study seeks to determine three analytical methods of load capacity in stratified soils (2 layers) for shallow foundations: 1) Imaginary foundation, 2) Average parameter method (APM), and 3) Terzaghi's method to compare their results with those obtained from numerical modeling by means of the finite element method using a widely applied software (Abaqus academic version). Within the methodology developed in the finite element modeling, variables were parameterized (modulus of elasticity, depth of deflection, and displacement-load) and two behavioral laws were evaluated (Elastic and Drucker-Prager). The results that were obtained from the analysis show that when performing numerical modeling using the law of elastic behavior in soils of two layers, exaggerated results are generated with respect to analytical methods. Another important result is that when hard soils are on top of soft soils the results of numerical and analytical methods tend to be similar to each other. Most importantly, the variables that have the greatest influence on the load capacity in soils of one and two layers are the angle of friction, yield stress, and in the case of numerical analysis the constraint displacement (load). In addition, it was observed that for numerical modeling better results are obtained when considering an elastoplastic model, such as Drucker Prager.
Los métodos para encontrar capacidad de carga en suelos estratificados son cuantiosos y difieren en sus métodos y resultados. Lo anterior, hace que exista incertidumbre en la práctica de la ingeniería o que se incurra en sobredimensionamiento de la solución de cimentación. Este trabajo busca estudiar tres métodos analíticos de capacidad de carga en suelos estratificados (2 estratos) para cimentaciones superficiales: 1) Zapata imaginaria, 2) Método de Parámetros Promedio (APM) y 3) Método de Terzaghi, para comparar sus resultados con los obtenidos de la modelación numérica por medio del método de elementos finitos usando un software de amplia aplicación (Abaqus) versión académica. Dentro de la metodología desarrollada en la modelación de elementos finitos se parametrizaron variables (módulo de elasticidad, profundidad de desplante y desplazamiento-carga) y se evaluaron dos leyes de comportamiento (Elástica y Drucker-Prager). Los resultados que se obtuvieron en el desarrolla del análisis apuntan a que al realizar las modelaciones numéricas usando la ley de comportamiento elástica en suelos de dos estratos dan resultados exagerados respecto a los de métodos analíticos, otro resultado importante es que cuando se tiene suelos duros sobre suelos blandos los resultados de métodos numéricos y analíticos tienden a ser similares entre sí. Dentro de las conclusiones más importantes tenemos que las variables que más influyen en la capacidad de carga en suelos de un estrato y dos estratos son, el ángulo de fricción, esfuerzo de fluencia y en el caso de las modelaciones numéricas el desplazamiento impuesto de falla (carga). Además, se tiene que para las modelaciones numéricas se obtiene mejores resultados cuando se considera un modelo elastoplástico, como Drucker Prager.
 
Publisher Universidad Pedagógica y Tecnológica de Colombia
 
Date 2021-02-24
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Artículo de revista
 
Format application/pdf
application/pdf
 
Identifier https://revistas.uptc.edu.co/index.php/ingenieria/article/view/12080
10.19053/01211129.v30.n55.2021.12080
 
Source Revista Facultad de Ingeniería; Vol 30 No 55 (2021): January-March 2021 (Continuous Publication); e12080
Revista Facultad de Ingeniería; Vol. 30 Núm. 55 (2021): Enero-Marzo 2021 (Publicación Continua); e12080
2357-5328
0121-1129
 
Language eng
spa
 
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https://revistas.uptc.edu.co/index.php/ingenieria/article/view/12080/10279
https://revistas.uptc.edu.co/index.php/ingenieria/article/view/12080/10277
 
Rights Copyright (c) 2021 Jairo Alejandro Quintero-Chamorro, Brayan Julián Martínez-Ortega, Lucio Gerardo Cruz-Velasco, Ph. D.
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0
 

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