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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
14/03/1996 |
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Data da última atualização: |
14/10/2002 |
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Autoria: |
REIS, A. E. G. dos. |
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Título: |
Effect of cohesive forces on the critical gradient. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Davis: University of California, 1977. |
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Páginas: |
99p. |
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Idioma: |
Inglês |
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Notas: |
PhD. Dissertation. |
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Conteúdo: |
The problem of sedimentation into subsurface drains has received much attention from those interested in designing gravel envelopes. Materials such as fine sand coarse silt are extremely susceptible to a "quick condition". Thus, it is a well-known practice to base the design criteria of gravel envelopes on considerations of grain-size curves. However, this may result in uneconomical approach when the same design is used for cohesive soils. The design should account for the hydrodynamic seepage forces causing movement of the soil particles, as well as the cohesive forces that operate at the contact of the particulate arrangement of the base material. Here I will examine the above mentioned aspects. It is my purpose to determine the effectiveness of parameterssuch as cohesive forces in foundations as vectors opposing the hydrodynamic forces that cause a "quick condition". A general study will attempt to analyze the possible mechanisms involved in the phenomenon of susceptibility to piping or tunneling, and of the movement of fines into subsurface drains. An investigation of the cohesive and adhesive forces that add to the critical gradient of a given base material may help improve the design and installation of agricultural drain pipes or drains placed under hydraulic structures. |
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Thesagro: |
Drenagem; Propriedade Mecânica; Solo. |
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Thesaurus Nal: |
drainage. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01763nam a2200181 a 4500
001 1565547
005 2002-10-14
008 1977 bl uuuu m 00u1 u #d
100 1 $aREIS, A. E. G. dos
245 $aEffect of cohesive forces on the critical gradient.
260 $aDavis: University of California$c1977
300 $a99p.
500 $aPhD. Dissertation.
520 $aThe problem of sedimentation into subsurface drains has received much attention from those interested in designing gravel envelopes. Materials such as fine sand coarse silt are extremely susceptible to a "quick condition". Thus, it is a well-known practice to base the design criteria of gravel envelopes on considerations of grain-size curves. However, this may result in uneconomical approach when the same design is used for cohesive soils. The design should account for the hydrodynamic seepage forces causing movement of the soil particles, as well as the cohesive forces that operate at the contact of the particulate arrangement of the base material. Here I will examine the above mentioned aspects. It is my purpose to determine the effectiveness of parameterssuch as cohesive forces in foundations as vectors opposing the hydrodynamic forces that cause a "quick condition". A general study will attempt to analyze the possible mechanisms involved in the phenomenon of susceptibility to piping or tunneling, and of the movement of fines into subsurface drains. An investigation of the cohesive and adhesive forces that add to the critical gradient of a given base material may help improve the design and installation of agricultural drain pipes or drains placed under hydraulic structures.
650 $adrainage
650 $aDrenagem
650 $aPropriedade Mecânica
650 $aSolo
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Registro original: |
Embrapa Cerrados (CPAC) |
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| 2. |  | CARVALHO, D. de O. Milho: com equilíbrio. Cultivar Grandes Culturas, Pelotas, v. 12, n. 133, p. 19-21, jun. 2010.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 5 |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 14. | | SANTOS, A. M.; MITJA, D.; CARVALHO, D. C. Extrato arbóreo nas pastagens: o caso da agricultura familiar (comunidade de Benfica, sul do Pará). In: CONGRESSO BRASILEIRO DA CIÊNCIA DAS PLANTAS DANINHAS, 25., 2006, Brasília, DF. Convivendo com as plantas daninhas: resumos. Brasília, DF: Sociedade Brasileira da Ciência das Plantas Daninhas: UnB: Embrapa Cerrados, 2006. p. 57| Biblioteca(s): Embrapa Cerrados. |
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| 17. | | MACHADO, R. L.; COSTA, J. R.; CARVALHO, D. F. de. Freqüência, probabilidade de ocorrência e análise multivariada da erosividade das chuvas para os diferentes padrões de precipitação no estado do Rio de Janeiro e erodibilidade de um argissolo vermelho-amarelo em Seropédica, RJ. In: FÓRUM DE PÓS-GRADUAÇÃO DA UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO, 2., 2007, Seropédica, RJ. Anais... Seropédica: Editora da UFRRJ, 2007. 1 p. 1 CD-ROM. Parcerias: UFRRJ.| Tipo: Resumo em Anais de Congresso | Circulação/Nível: -- - -- |
| Biblioteca(s): Embrapa Agrobiologia. |
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| 20. | | CARVALHO, D. O.; COSTA, R. V. da; CARVALHO, C. O. Influência da adubação nitrogenada e potássica na podridão de colmo do milho por antracnose (Colletotrichum graminicola) em duas cultivares de milho Tropical Plant Pathology, Brasília, v. 34, p. S48, ago. 2009. Trabalho apresentado no 42º Congresso Brasileiro de Fitopatologia, 2009, Rio de Janeiro, RJ.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| Registros recuperados : 289 | |
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