Monitoramento de uma estrutura de contenção em estacas espaçadas considerando perfil de sucção
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2015-08-14
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Universidade Federal de Goiás
Resumo
This study presents the results of an extensive field monitoring program in which the lateral
displacements of a nail reinforced sheet pile wall in Goiânia, Brazil were measured during the
excavation process. The instrumentation methods adopted were multiple point borehole
extensometers (MPBX) and optical surveying. The MPBX showed good results that could be
appropriately interpreted as the excavation progressed. However, the measurements of optical
surveying were not reliable due the low precision of total station and for being highly affected
by user’s errors. In order to determine the geotechnical profile, laboratory test were
undertaken to obtain strength and deformation parameters for unsaturated and saturated soil
conditions. The large variability of the soil, observed in terms of void ratio, presented an
important obstacle, making the determination of representative shear strength parameters a
challenge. As a way to bridge the analysis of field monitoring results, soil properties and the
numerical back analyses of the retaining walls, the water content profile and the soil-water
characteristic curve were measured. Such data was used to obtain the suction profile and
evaluated its influence in the monitored field data. Finally, the numerical code Sheeting
Check (Geo5), which uses the beam on elastic foundation method, was employed to obtain
the soil subgrade reaction modulus (ks) and determine the retaining wall deformation profile
and earth pressures in saturated and unsaturated soil condition. The maximum lateral
displacements values found in the numerical back analyses were compatible with the
monitoring results. Besides, the influence of unsaturated soil conditions and soil suction in the
reduction of the retaining wall deformations and the active earth pressures were observed.
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GOMES, A. C. Monitoramento de uma estrutura de contenção em estacas espaçadas considerando perfil de sucção. 2015. 192 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2015.