Título: | BEHAVIOUR OF A NAILED EXCAVATION IN GNEISSIC RESIDUAL SOIL | |||||||
Autor: |
ANDRE PEREIRA LIMA |
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Colaborador(es): |
ALBERTO DE SAMPAIO FERRAZ JARDIM SAYAO - Orientador ANNA LAURA LOPES DA SILVA NUNES - Coorientador |
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Catalogação: | 04/DEZ/2007 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: |
THESIS
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Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=10979&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=10979&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.10979 | |||||||
Resumo: | ||||||||
The behavior of a nailed excavation in gneissic residual
soil has been
studied by a comprehensive research program, including
instrumentation, field
and laboratory tests and numerical analyses. Soil nailing
is becoming a popular
stabilization technique in Brazil. However, a solid
knowledge about the soil-nail
interaction is still lacking. There are a few studies
about the inherent
deformations of the reinforced mass and the magnitude of
nail`s stresses. In
Brazil, less than 10% of stabilization works have some
type of instrumentation.
The main objective of this research was monitoring and
analysing a 40m high soil
nailed slope excavation.
Due to this unique height, the upper nails were installed
with 24m length.
The slope behavior was influenced by several factors, such
as the construction
technique and a subsequent excavation at one adjacent
site. The results
indicated a significant increase of reinforced mass
displacements and of the nail s
mobilized tension during the progress of the excavation.
These did not cease
after the end of the excavation, due to the adjacent work.
During and after
construction, the nails worked predominantly in tension.
Estimated tension loads
in the project phase were compared with the
instrumentation s results. The stress
distribution was influenced by local geology. The maximum
axial force (Tmáx)
increased exponentially with the progress of the
excavation and its position, in
each nail, varies with the slope s depth and inclination.
The magnitude of the
axial load in the excavation face is observed to be
between 0,3 and 0,6 of Tmáx.
The mobilization of the reinforcement elements was smaller
than 35% qs.
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