Título: | EXPERIMENTAL STUDY ON THE SOIL-GEOGRID INTERACTION MECHANISMS | |||||||
Autor: |
ANA CRISTINA CASTRO FONTENLA SIEIRA |
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Colaborador(es): |
ALBERTO DE SAMPAIO FERRAZ JARDIM SAYAO - Orientador |
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Catalogação: | 11/DEZ/2003 | 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=4295&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=4295&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.4295 | |||||||
Resumo: | ||||||||
A study of soil-geogrid interaction mechanisms was carried
out through a detailed testing program in large dimensions
equipments at the Geotechnical Laboratory of Cedex, Spain.
Three different types of geogrids on sand and clayey-silt
were considered in pullout, direct shear and triaxial
tests. Additional tension tests on geogrid specimens were
also carried out. The pullout tests were performed for
investigating the effects of confining pressure, relative
density, geogrid geometry and damaged elements on the
behavior of geogrids. Based on he test results, it is shown
that the pullout strength may be divided into three main
components, corresponding to friction, adhesion and passive
resistance of transversal elements. The direct shear tests
were used for obtaining interface strength parameters and
the effect of the inclination angle between the geogrid
and the failure surface. It is shown that the optimum
inclination is about 60 degrees. This suggests that, in
reinforced fills, geogrid layers shall be positioned
horizontally. Experimental results and numerical analysis
indicate that only the central portion of the direct shear
box is subjected to shear stresses and strains. This
central zone corresponds to about 40% of the specimen
height. The triaxial tests were performed for evaluating
the effect of the number of geogrid layers on the
deformability and strength of reinforced specimens.
Introduction of additional reinforcement layers has a
similar effect to an increase of confining pressure. The
unconfined tension tests allowed a detailed investigation
of the effects of grid damage on the strength parameters of
geogrids. Natural damage, induced by compaction procedures,
is shown to be more intense when coarse soil is used.
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