Influência do espaçamento vertical entre reforços nos deslocamentos de solo reforçado com geossintético para condições de muros portantes
The Geosynthetic Reinforced Soil (GRS) bridge-supporting walls are structures in which the bridge abutment is supported directly by the reinforced fill, allowing the reinforced soil structure to function both as a retaining element and as a foundation one. The advantages of GRS bridge-supporting wal...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Norte (UFRN) |
| Repositorio: | Repositório Institucional da UFRN |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.ufrn.br:123456789/31395 |
| Acceso en línea: | https://repositorio.ufrn.br/handle/123456789/31395 |
| Access Level: | acceso abierto |
| Palabra clave: | Muro portante Deslocamento lateral Recalque Espaçamento vertical Simulação numérica |
| Sumario: | The Geosynthetic Reinforced Soil (GRS) bridge-supporting walls are structures in which the bridge abutment is supported directly by the reinforced fill, allowing the reinforced soil structure to function both as a retaining element and as a foundation one. The advantages of GRS bridge-supporting walls include cost reduction, rapid construction, ability of supporting differential settlements, and good seismic performance. However, due to being a recent construction method, there are few studies regarding this topic. Especially concerning the effect of vertical spacing between reinforcement layers for a constant ratio of geosynthetic stiffness (J) to the vertical spacing (Sv). This research investigated the influence of the vertical spacing between geosynthetic layers on the reinforced soil mass performance considering the effect of the J/Sv ratio. The finite element software PLAXIS 2D (2016 version) was used to perform numerical simulations and small values of vertical spacing were assumed, according to the typically used distances in GRS bridge-supporting walls. The validation of the numerical model was performed using results of laboratory tests conducted at The University of Texas at Austin, USA. The tests were carried out using a large rigid box, in which the frontal wall allows for lateral movements. Thereby, it was possible to simulate displacements from the facing of the real retaining structure at the bridge abutment in the field. A parametric analysis was performed by variating the vertical spacing, the reinforcement stiffness, the height, and the length of the reinforced soil. The results indicated that the increase in the stiffness and decrease in the vertical spacing of the geosynthetic layers led to smaller lateral displacements and smaller settlements. Nevertheless, the decrease in the vertical spacing was perceived as a more significant aspect than the reinforcement stiffness. The variation of the vertical spacing caused different displacements for smaller values of the J/Sv ratio. However, no significant changes were observed for larger values of the J/Sv ratio. |
|---|