| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 4.62 MB | Adobe PDF |
Authors
Abstract(s)
A presente dissertação insere-se na análise da estabilidade de taludes sob o efeito dos processos biológicos.
Os processos através dos quais a biologia pode modificar as propriedades dos solos com interesse para a Engenharia Civil dependem do tipo de organismos envolvidos, nomeadamente, raízes de plantas, insetos e invertebrados e microrganismos. O efeito da atividade biológica sobre o comportamento de um solo argiloso tem interesse em algumas situações geotécnicas que envolvam problemas de estabilidade de taludes, tais como taludes naturais, diques e barragens de rejeitados. A consideração do solo como um ecossistema vivo oferece ainda o potencial de soluções inovadoras e sustentáveis para problemas geotécnicos. Este é um novo paradigma para muitos na engenharia geotécnica. Perceber o potencial desse paradigma requer uma abordagem multidisciplinar que abraça a biologia e a geoquímica para desenvolver técnicas de melhoramento dos terrenos.
Neste contexto, a presente dissertação pretende contribuir para melhorar o conhecimento sobre o comportamento dos solos contendo biopolímero e demonstrar a sua importância para a análise do comportamento das infraestruturas geotécnicas, em particular na estabilidade de talude em areia argilosa.
Para concretizar este objetivo, foram considerados diferentes métodos experimentais para a caracterização laboratorial do comportamento do material em condições saturadas. O estudo baseou-se em observações por MEV e em ensaios Fall Cone, Vane Test e edométricos de permeabilidade.
O presente estudo evidencia o efeito do biopolímero na estrutura do solo, promovendo a agregação das partículas mais finas, e o consequente aumento da permeabilidade e da resistência ao corte em condições não drenadas, demonstrando assim a importância da consideração deste processo biogeoquímico na análise da estabilidade de taludes.
The present work is on the slope stability analysis, with scope in the study of the behavior of slopes when subjected to the effect of the biological processes. The processes through which biology can modify soil properties of interest to Civil Engineering depend on the type of organisms involved, namely, plant roots, insects and invertebrates, and microorganisms. The effect of the biological activity on the behavior of a clayey soil is important in some geotechnical situations that involve slope stability problems, such as natural slopes, dikes and mine tailings storage facilities. Considering the soil as a living ecosystem still offers the potential of innovative and sustainable solutions to geotechnical problems. This is a new paradigm for many in geotechnical engineering. Realizing the potential of this paradigm requires a multidisciplinary approach that embraces biology and geochemistry to develop ground improvement techniques. In this context, the present work intends to contribute to improve the knowledge about the behavior of soils incorporating a biopolymer and to demonstrate its importance for the analysis of the behavior of geotechnical infrastructures, in particular slope stability in clayey sand. To achieve the proposed objective, different laboratory experimental methods were considered for the characterization of the behavior of the material under saturated conditions. The study was based on Scanning Electron Microscopy and Fall Cone, Vane Test and Oedometric permeability tests. The present study evidences the effect of the biopolymer on the soil structure, promoting the aggregation of the finer particles, and the consequent increase of the permeability and the shear strength in undrained conditions, thus demonstrating the importance of the consideration of this biogeochemical process in the slope stability analysis.
The present work is on the slope stability analysis, with scope in the study of the behavior of slopes when subjected to the effect of the biological processes. The processes through which biology can modify soil properties of interest to Civil Engineering depend on the type of organisms involved, namely, plant roots, insects and invertebrates, and microorganisms. The effect of the biological activity on the behavior of a clayey soil is important in some geotechnical situations that involve slope stability problems, such as natural slopes, dikes and mine tailings storage facilities. Considering the soil as a living ecosystem still offers the potential of innovative and sustainable solutions to geotechnical problems. This is a new paradigm for many in geotechnical engineering. Realizing the potential of this paradigm requires a multidisciplinary approach that embraces biology and geochemistry to develop ground improvement techniques. In this context, the present work intends to contribute to improve the knowledge about the behavior of soils incorporating a biopolymer and to demonstrate its importance for the analysis of the behavior of geotechnical infrastructures, in particular slope stability in clayey sand. To achieve the proposed objective, different laboratory experimental methods were considered for the characterization of the behavior of the material under saturated conditions. The study was based on Scanning Electron Microscopy and Fall Cone, Vane Test and Oedometric permeability tests. The present study evidences the effect of the biopolymer on the soil structure, promoting the aggregation of the finer particles, and the consequent increase of the permeability and the shear strength in undrained conditions, thus demonstrating the importance of the consideration of this biogeochemical process in the slope stability analysis.
Description
Keywords
Biopolímero Estabilidade de Taludes. Permeabilidade Processos Biológicos Resistência Ao Corte