The behavior of a foundation transversally loaded at the top over highly porous and collapsible soil

Abstract

En la práctica de la ingeniería geotécnica es común el empleo de fundaciones por pilas cargadas transversalmente en la parte superior. Frecuentemente este tipo de fundación es ejecutada en suelos de alta porosidad y colapsables, comunes en varias regiones de Brasil. Debido a la poca información disponible en la literatura, se realizaron dos pruebas de carga con cargamento transversal en una pila (diám. 0,8 m; prof. 9,0m; diám. base 1,60m). Se realizó una prueba de carga estando el suelo en su condición de humedad natural y otra después de la previa inundación. Fueron obtenidas las curvas carga x desplazamiento horizontal y los coeficientes de reacción horizontal. Los resultados permitieron verificar la aplicabilidad de fórmulas teóricas de previsión de comportamiento, así como proponer parámetros a ser utilizados para el suelo. Previo a la realización de las pruebas de carga fueron realizados ensayos de laboratorio y campo para la investigación del subsuelo.

Wind Effects on Foundations of Silos and Light Structures: Solution by Use of Steel Piles in Diabasic Soil

“…Miranda Junior et al, (2008) obtained the value of 11.5 MN m -3 using excavated concrete piles for this soil type in the same experimental field where load tests were performed. Kassouf et al, (2016) generically presents the value of 2.6 MN m -3 for sandy soils of high porosity, without specifying the type of pile and location. Almeida et al, (2011) obtained the value of 0.65 MN m -3 for excavated piles for the sandy soil of the city of São Carlos.…”

“…In the tensile load test, the transfer beam is supported on the two lateral piles and the test pile is pulled. Kassouf et al, (2016), Albuquerque et al, (2011), and Paschoalin Filho & Carvalho (2010) present details of the performance of load tests with horizontal loading with compression and traction, respectively.…”

“…To design foundations under horizontal loading, horizontal displacement should be established, from which the allowable stress for the foundation is defined. The theoretical formulation leads to the soil horizontal reaction coefficient (nh) for the type of soil under study (Kassouf et al, 2016). This coefficient is defined as: Equation 1shows that nh depends on horizontal displacement y0, due to the horizontal stress H. On the other hand, if the value of nh is known, the lateral displacement value can be calculated by:…”

“…This soil type has been studied by Paschoalin Filho & Carvalho (2010), Cury Filho (2016), Carvalho & Albuquerque (2015); Albuquerque (2001), Miranda Junior et. al., (2008), Kassouf et. al., (2016), Cavalcante & Carvalho (2007).…”

Behavior of a new laterally top-loaded post-grouted micropile in highly porous lateritic soil

“…Posteriorly, Miguel et al [15] tested two TR37 section steel-rail anchor piles at the respective field, one with a single section and the other with a double section and lengths of 12 and 18 m, respectively. Kassouf et al [16] and Albuquerque et al [17] studied the behavior of a belled caisson with 0.8 m in diameter, 9 m in depth, and 1.6 m in base diameter at the experimental site. Lastly, Albuquerque et al [17] also presented the results for a CFA pile and a bored pile, both with 12 m length and 0.40 m diameter, and a steel pile with the same length.…”