Steady Downward Flow to a Water Table

Arbhabhirama, Anat; Kridakorn, Chanaphan

doi:10.1029/wr004i006p01249

Cited by 18 publications

(3 citation statements)

References 4 publications

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“…Se han propuesto diferentes relaciones entre el coeficiente de permeabilidad y la succión matricial, algunas se presentan en la Tabla 3-2 (Gardner, 1958) a, n = constantes 𝑘 𝑤 = 𝑘 𝑠 {( 𝑢 𝑎 − 𝑢 𝑤 )/(𝑢 𝑎 − 𝑢 𝑤 ) 𝑏 } 𝑛´+ 1 (Arbhabhirama & Kridakorn, 1968) n´ =constante Adaptado de (Fredlund et al, 2012)…”

Section: Permeabilidad De Los Suelos No Saturadosunclassified

Soil–Water Characteristic Curve Variability

Zapata¹,

Houston

Houston³

et al. 2000

Advances in Unsaturated Geotechnics

128

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Effect of wetting-drying cycles on a residual amphibolite soil's suction from western Medellin in a natural and compacted stateSlope stability is affected by a variety of physical and chemical phenomena, climate is one of the most relevant factors in this regard. In tropical areas there are great meteorological variations throughout the year, and surface soils are the most susceptible to changes in humidity and temperature that affect their behavior and resistance.To evaluate the influence of these variations, several moistening and drying cycles were developed for the soil of a road slope located west of the Aburra Valley. Laboratory tests were initially performed on undisturbed and compacted samples and subsequently on samples subjected to drip wetting and oven drying at 30 ° C. The physical and chemical characterization of the soil is initially carried out and the suction curve is measured by the filter paper method, the permeability and the resistance parameters for each wetting and drying cycle. The results showed that the soil suction gradually decreases with the number of wetting and drying cycles for both samples, more noticeable in the natural than in the compacted sample since the latter has a structure with smaller pores and the variations are perceived in less.The results of the research include a slope stability analysis that includes the hydraulic and resistance properties of both samples, obtaining a decrease in the safety factor after the wetting and drying cycles, compared to the initial sample, both for the natural and compacted sample.With the results, a step forward is taken in the study of mass movements triggered by rain since through the experimental methodology by which the moistening cycles are recreated from field data such as humidity, temperature and precipitation, it is can anticipate variation in parameters that influence slope stability.

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Section: Permeabilidad De Los Suelos No Saturadosunclassified

Soil–Water Characteristic Curve Variability

Zapata¹,

Houston

Houston³

et al. 2000

Advances in Unsaturated Geotechnics

128

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“…7, have been reported, although not identified as such, in the experimental studies in the hydrology literature. 15,16 Figure 8 shows the capillary pressure from Scott and Corey's 15 water drainage experiments. They introduced water at the top of a soil column and let it drain because of gravity through a column saturated with air initially.…”

Section: Experimental Evidence Of Dynamic Pressure Profilesmentioning

confidence: 99%

Defining Fluid Distribution and Fluid Contacts for Dynamically Charged Reservoirs

Siddiqui

1999

All Days

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractDefining fluid contacts(GWC/OWC/GOC) is one of the major variables for defining the initial hydrocarbons in place. In exploratory wells RFT/MDT is often used to define OWC/GWC. In defining contacts static capillary-buoyancy equilibrium is assumed. There is ample field evidence that many of the existing reservoirs are actively being charged from the source rocks. Under these conditions the assumption of static fluid distributions may not be valid and dynamic conditions should be used for defining the fluid distributions and the contacts. This paper defines the fluid distributions and fluid contacts for dynamically charged reservoirs. The method is based on the recently proposed Dynamic Theory of Hydrocarbon Migration and Trapping. The results of numerous numerical simulations show that assuming static saturation profiles may not be valid for reservoirs having active influx of fluids into them. This is true even at very small influx rates (10 -9 m/s-10 -14 m/s). The pressure profiles for the static case (no viscous forces) are compared and contrasted with the dynamic pressure profiles. The dynamic pressure drops can be explained on the basis of Darcy's law and relative permeability effects under extreme saturations. These pressure drops are then used to calculate the saturation distribution in the hydrocarbon column and the transition zones. The results show that if the assumption of static equilibrium is used for the dynamically charged reservoirs it will lead to the underestimation of the initial hydrocarbon in place. The non-equilibrium effects can also explain free water production from zones far above the transition zone, expected, on the basis of static assumption. The interpretation of MDT data under both static and dynamic conditions is also discussed.

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“…Atualmente existem vários modelos estatísticos propostos para a previsão da condutividade hidráulica de solos não saturados (e.g. GARDNER 1958, BROOKS & COREY 1968, ARBHABHIRAMA & KRIDAKORN 1968, MUALEM 1976, VAN GENUCHTEN 1980e FREDLUND et al 1994, VANAPALLI & LOBBEZOO 2002.…”

Section: Condutividade Hidráulicaunclassified

Estudo das propriedades geotécnicas de solos residuais não saturados de Ubatuba (SP).

Mendes¹

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Agradeço primeiramente a Deus, que sempre me deu muita saúde, paz espiritual, motivação, sabedoria e iluminou meu caminho, sem os quais eu certamente não teria superado os diversos obstáculos encontrados nessa jornada. Ao professor Fernando Marinho pelo grandioso e constante apoio, incentivo e orientação no decorrer do desenvolvimento dessa pesquisa, e pela confiança na minha capacitação, num momento muito importante da minha vida e carreira profissional. À professora Maria Cristina Motta de Toledo do Instituto de Geociências da USP, pelo precioso auxílio nos trabalhos de campo e nas análises de micromorfologia. Ao professor Renato Luiz Prado do Departamento de Geofísica do IAG-USP, pela realização e interpretação dos ensaios geofísicos. Aos professores Marcos Massao Futai e Carlos de Sousa Pinto, pelas valiosas sugestões quando foram solicitados no decorrer dessa pesquisa. Aos professores do programa de pós-graduação cujos ensinamentos transmitidos foram imprescindíveis para a ampliação do meu conhecimento na área de engenharia geotécnica. Ao Instituto Geológico (Processo SMA 30.120/05) e à FAPESP (Processo nº 05/55736-5) pelo apoio financeiro concedido para a realização dessa pesquisa. Aos amigos e pesquisadores da Seção de Geologia Aplicada e Ambiental do Instituto

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Steady Downward Flow to a Water Table

Cited by 18 publications

References 4 publications

Soil–Water Characteristic Curve Variability

Soil–Water Characteristic Curve Variability

Defining Fluid Distribution and Fluid Contacts for Dynamically Charged Reservoirs

Estudo das propriedades geotécnicas de solos residuais não saturados de Ubatuba (SP).

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