Influência do perfil de sucção em obras de contenção em solos não saturados
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Data
2013-07-22
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Universidade Federal de Goiás
Resumo
The need for the use of structures retaining wall have been increasingly used in engineering
works. The valuation of soil use has led to wide-ranging exploration of the subsoil, resulting
in large excavations that change the equilibrium state of the soil. The performance and design
of retaining wall require a good understanding of the stress state of the soil, soil-structure
interaction and varying the saturation of soil during construction and useful life. The useful
life of retaining wall must ensure stability, functionality and durability. The analysis of soilstructure
interaction becomes important by the fact that the same structure subjected to the
same external load, presents support reactions that vary with the particular conditions of the
mass of soil in which it lies. Therefore the study of soil-atmosphere interaction is an essential
factor for unsaturated soils. In order to evaluate the influence of suction on structural design
in balance were simulated real conditions of rainfall in three different soils for three
excavations (3, 6 e 9 m) and inciciais different conditions N.A. It was observed that the
behavior of the suction profile is inwardly related to the parameters as well as saturated and
unsaturated soil each, with the intensity and duration of precipitation. Through the theory of
earth pressure Rankine for saturated soils, the formulation was developed to calculate the
active and passive earth pressure into account the unsaturated soil for three different behaviors
of suction, i.e., constant suction over the depth matric suction decrease linearly with depth and
suction profile mixed (ie, the part is kept constant and decrease linearly with depth). After
determination of the active and passive earth pressure was established equilibrium limit
retaining wall and give the sheet length for safety factors of 1,0 and 1,5. It was noticed that
there is reduction in the active earth pressure and increased passive earth pressure for all
conditions in suction profile. Due to suction, there is an increased horizontal depth tension
zone that contributes to the reduction in the horizontal efforts on the structures retaining wall ,
then a reduction in the sheet length. Otherwise the specific weight natural varies with the
suction and that is a factor that can increase efforts, particularly for rainfall with relative
intensity close to 1 (q/ksat) and saturated soils with high permeability, where suction is small
and has constant distribuiton in the soil profile.
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Citação
ROCHA, M. F. Influência do perfil de sucção em obras de contenção em solos não saturados. 2013. 275 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2013.