Infuência do perfil de sucção no dimensionamento de solo grampeado em solo não saturado
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2016-01-29
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Universidade Federal de Goiás
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The use of soil nailing technique can be an important alternative for the stabilization of a slope or an excavation. Nails are retaining elements that reinforce soil masses acting passively, requiring strains to mobilize their resistance. The mechanical behavior analysis of a structure with soil nailing technique can be made using limit equilibrium methods, being represented by loads applied to reinforcing layers or sub-horizontal slices of a slope. The slice has its base crossed by a reinforcing action line and the reinforcing nail is treated as a concentrated point load acting on the base point of intersection of a slice with the line of action. Thus, through analytical and numerical calculations, this dissertation studied the design of soil nailing structure considering variations of suction, which influences the soil resistance, simulating suction profiles of a typical soil of the Brazilian Midwest region. This study was conducted determining strength parameters on nail-soil interface by tests in the field, i.e. nail pullout tests, and soil strength and hydromechanical parameters determined in the laboratory. For this, two separate suction sections were studied, and in each case, numerically analyzed in soil nailing structures, obtaining the dimensions of the structure through a pre-sizing phase, and then analyzing the factor of safety of the structure using computer programming considering the Bishop method. In the first case, the distribution of suction was numerically simulated for the soil profile studied in a critical condition of rainfall in Goiania region. Then, the suction field profile was obtained for comparison with the first case. With the results of this research, it was possible to understand the increasement of resistance and safety fator of the structure when considering the suction effects at the design of soil nailed structures in a typical soil of Goiânia region.
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SILVA, E. D. Infuência do perfil de sucção no dimensionamento de solo grampeado em solo não saturado. 2016. 142 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2016.