Comparação de teorias de Interação entre Estacas
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2015-08-27
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Universidade Federal de Goiás
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With the expansion of urban areas, there is a tendency to vertical structures, with these being increasingly slim and constructed into smaller areas. In these cases, for it is often necessary to measure deep foundations, as piled foundations in order to resist high internal forces and with little available space, resulting in caps with many piles and next to each other, or even forming piled rafts. The influence of this high amount and proximity of piles cannot be neglected. To consider the effect of a pile in another, several theories have been formulated to better represent the interaction between piles, but there is not yet an established theory which results in factors that best represent the reality. In this way, this work aims to study existing methods in predicting the interaction factor between piles comparing results of analytical methods with numerical solutions. For this comparison was used the program of finite element method DIANA as a reference the values considered closer to the exact solution. The various theories are compared in accordance with the cases already reported in the literature, through the factors interaction between piles. Thus, it can be seen that the theories of Cao and Chen (2008) and Mylonakis Gazetas (1998) showed good agreement with the results of DIANA, but not in all cases of combination relative length (L/d) and relative stiffness (K), as Poulos and Davis (1980). And when one considers the possibility of having end-bearing piles, both Poulos and Davis (1980) and El Sharnouby and Novak (1990) overestimate, largely, the values from the finite element solution. However, this last is more precise in the condition of layered soil than the first theory. Furthermore, analyzes were performed by modeling with varying amounts of piles, in order to evaluate the influence of the presence of intermediate piles in the interaction between the piles. Thus, it was noted that there was increasing variation of factors interaction between piles with increasing amount of piles, such as when the piles are arranged concentrically and not more in line manner. Finally, settlements of pile groups are analyzed, in order to verify the difference between the settlements obtained via modeling by DIANA and through prediction method of settlement of pile groups. The latter analysis showed that small differences between the interaction factors between two piles could change the forecast of settlements by theoretical methods, causing representing differences.
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CURADO, T. S. Comparação de teorias de Interação entre Estacas. 2015. 151 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2015.