Bibliografías temáticas / Pore Pressure

Literatura académica sobre el tema "Pore Pressure"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 20 de febrero de 2023

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Artículos de revistas sobre el tema "Pore Pressure"

1

Christensen, N. I. y H. F. Wang. "The Influence of pore pressure and confining pressure on dynamic elastic properties of Berea sandstone". GEOPHYSICS 50, n.º 2 (febrero de 1985): 207–13. http://dx.doi.org/10.1190/1.1441910.

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Compressional‐ and shear‐wave velocities of watersaturated Berea sandstone have been measured as functions of confining and pore pressures to 2 kbar. The velocities, measured by the pulse transmission technique, were obtained at selected pressures for the purpose of evaluating the relative importance of confining pressure and pore pressure on elastic wave velocities and derived dynamic elastic constants. Changes in Berea sandstone velocities resulting from changes in confining pressure are not exactly canceled by equivalent changes in pore pressure. For properties that involve significant bulk compression (compressional‐wave velocities and bulk modulus) an incremental change in pore pressure does not entirely cancel a similar change in confining pressure. On the other hand, it is shown that a pore pressure increment more than cancels an equivalent change in confining pressure for properties that depend significantly on rigidity (shear‐wave velocity and Poisson’s ratio). This behavior (as well as observed wave amplitudes) is related to the presence of high‐compressibility clay that lines grains and pores within the quartz framework of the Berea sandstone.
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2

Bruce, Bob y Glenn Bowers. "Pore pressure terminology". Leading Edge 21, n.º 2 (febrero de 2002): 170–73. http://dx.doi.org/10.1190/1.1452607.

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Li, Yanzhi, Yue Wu, Weiguo Qiao, Shuai Zhang y Xungang Li. "The Permeability Evolution of Sandstones with Different Pore Structures under High Confining Pressures, High Pore Water Pressures and High Temperatures". Applied Sciences 13, n.º 3 (30 de enero de 2023): 1771. http://dx.doi.org/10.3390/app13031771.

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Seepage from the pores of sandstone exposed in deep mines is difficult to block by grouting. In this paper, the permeability evolution of four subcategories of sandstone with different pore structures under different confining pressures, pore water pressures and temperatures is analyzed by experiments. (1) With increasing confining pressure, the permeabilities of the four tested subcategories of sandstone all decrease, but at different rates and to different extents. (2) With increasing pore water pressure, the permeability of subcategory I1, I2 and II1 sandstones increases linearly, while that of subcategory II2 sandstone decreases following a power function under low confining pressures and tends to be stable under high confining pressures. (3) With increasing temperature, the permeabilities of the four sandstone subcategories decrease at different rates. (4) The orthogonal experimental results show that the confining pressure has the greatest influence on the permeability, followed by the water pressure and temperature. (5) The confining pressure, pore water pressure and temperature produce stress-strain in sandstone and thus change the sandstone pore structure and permeability. The permeability evolution of sandstones varies with pore structure. The findings of this study can inform the classified grouting of deep sandstone and optimize grouting parameters.
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4

Cao, Hanxue, Ziwei Luo, Chengcheng Wang, Jing Wang, Tao Hu, Lang Xiao y Junqi Che. "The Stress Concentration Mechanism of Pores Affecting the Tensile Properties in Vacuum Die Casting Metals". Materials 13, n.º 13 (6 de julio de 2020): 3019. http://dx.doi.org/10.3390/ma13133019.

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The absolute pressure strongly affects the porosity and mechanical properties of castings produced by vacuum high-pressure die casting (V-HPDC) technology. The pore size, quantity and distribution of AlSi9Cu3 samples under three absolute pressures were evaluated by X-ray tomography and optical and electron microscopy. The paper presents an elaboration the stress concentration mechanism of pores affecting the tensile properties. According to a mathematical analysis of a sample under uniaxial stress, the greater the radius of the pore, the higher the stress value is at the pore perimeter. When the absolute pressure drops from 1013 mbar to 100 mbar, the porosity decreases from 6.8% to 2.8%, and the pore number and mean size decreases. In tensile tests, the pore sizes of the fracture surface decrease with decreasing absolute pressure, and the pore distribution becomes uniform. The tensile properties and extensibility of the sample are improved, and the microscopic fracture surface of the sample changes from cleavage fracture to quasi-cleavage fracture. The number, size and distribution of pores in die casting collectively affect the properties of the sample. Large-size or complex pores or pores with concentrated distributions produce large stress concentrations, decreasing the strength of the metal.
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5

Du, Hao, Jian Zhong Qi, J. X. Wu, S. Q. Du y Tian Ying Xiong. "Structure of Porous Copper Fabricated by Unidirectional Solidification under Pressurized Hydrogen". Materials Science Forum 654-656 (junio de 2010): 1030–33. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.1030.

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Porous copper with elongated cylindrical pores were fabricated by a unidirectional solidification method in a mixture of hydrogen and argon with high pressures. The porous copper with longitudinal pores and radial pores were compared on structure. The effect of both hydrogen pressure and argon pressure on structure of the porous copper including pore size, pore density, and porosity was investigated. The reason for the effect is explained.
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6

Drake, R. E., S. Dhother, R. A. Teague y J. C. Gabel. "Protein osmotic pressure gradients and microvascular reflection coefficients". American Journal of Physiology-Heart and Circulatory Physiology 273, n.º 2 (1 de agosto de 1997): H997—H1002. http://dx.doi.org/10.1152/ajpheart.1997.273.2.h997.

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Microvascular membranes are heteroporous, so the mean osmotic reflection coefficient for a microvascular membrane (sigma d) is a function of the reflection coefficient for each pore. Investigators have derived equations for sigma d based on the assumption that the protein osmotic pressure gradient across the membrane (delta II) does not vary from pore to pore. However, for most microvascular membranes, delta II probably does vary from pore to pore. In this study, we derived a new equation for sigma d. According to our equation, pore-to-pore differences in delta II increase the effect of small pores and decrease the effect of large pores on the overall membrane osmotic reflection coefficient. Thus sigma d for a heteroporous membrane may be much higher than previously derived equations indicate. Furthermore, pore-to-pore delta II differences increase the effect of plasma protein osmotic pressure to oppose microvascular fluid filtration.
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7

Letham, Eric Aidan y Robert Marc Bustin. "Investigating Multiphase Flow Phenomena in Fine-Grained Reservoir Rocks: Insights from Using Ethane Permeability Measurements over a Range of Pore Pressures". Geofluids 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/5098283.

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The ability to quantify effective permeability at the various fluid saturations and stress states experienced during production from shale oil and shale gas reservoirs is required for efficient exploitation of the resources, but to date experimental challenges prevent measurement of the effective permeability of these materials over a range of fluid saturations. To work towards overcoming these challenges, we measured effective permeability of a suite of gas shales to gaseous ethane over a range of pore pressures up to the saturated vapour pressure. Liquid/semiliquid ethane saturation increases due to adsorption and capillary condensation with increasing pore pressure resulting in decreasing effective permeability to ethane gas. By how much effective permeability to ethane gas decreases with adsorption and capillary condensation depends on the pore size distribution of each sample and the stress state that effective permeability is measured at. Effective permeability decreases more at higher stress states because the pores are smaller at higher stress states. The largest effective permeability drops occur in samples with dominant pore sizes in the mesopore range. These pores are completely blocked due to capillary condensation at pore pressures near the saturated vapour pressure of ethane. Blockage of these pores cuts off the main fluid flow pathways in the rock, thereby drastically decreasing effective permeability to ethane gas.
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8

Chen, Ke Lin, Jin Bo Lei y Zhi Liu. "Numerical Analysis on the Excess Pore Water Pressure of Pipe-Pile with Hole during the Static-Sinking Pile". Applied Mechanics and Materials 744-746 (marzo de 2015): 540–46. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.540.

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The time-space change rules of the environmental effects of the analysis of excess pore water pressure dissipation have also been studied during the static sinking-pile of the pipe-pile with hole. The results show: The excess pore water pressure will be dissipated with the time extending during the static sinking-pile of the 3 kinds of pipe-pole with hole. On the condition of the same effective radius, the depth of the observation dot is bigger, the excess pore water pressure will be bigger. On the contrast to the pipe-pole without hole, to some extent, the pipe-pole with hole can reduce the maximum of excess pore water pressure, and expedite the excess pore water pressure dissipation. This results can be provided the credible base for the theory research on the pipe-pole with hole and its application.
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9

Ruth, P. J. van, R. R. Hillis y R. E. Swarbrick. "DETECTING OVERPRESSURE USING POROSITY-BASED TECHNIQUES IN THE CARNARVON BASIN, AUSTRALIA". APPEA Journal 42, n.º 1 (2002): 559. http://dx.doi.org/10.1071/aj01032.

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Overpressure has been encountered in many wells drilled in the Carnarvon Basin. Sonic logs are used to estimate pore pressure in shales in the Carnarvon Basin using the Eaton and equivalent depth methods of estimating pore pressure from velocity data with reference to a normal compaction trend. The crux of pore pressure estimation from the sonic log lies in the determination of the normal compaction trend, i.e. the acoustic travel time (Δt)/depth (z) trend for normally pressured sediments. The normal compaction trend for shales in the Carnarvon Basin was established by fitting an Athy-type exponential relationship to edited sonic log data, and is: Δt = 225 + 391exp(-0.00103z) Vertical stress estimates are also needed for the Eaton and equivalent depth methods used herein. A vertical stress (σv) relationship was obtained by fitting a regression line to vertical stress estimates from the density log, and is: σv = 0.0131 z1.0642 The Eaton and equivalent depth methods yield similar pressure estimates. However, the equivalent depth method can only be applied over a limited range of acoustic travel times, a limitation that does not apply to the Eaton method. The pressure estimates from the Eaton method were compared to pressures measured by direct pressure tests in adjacent permeable units. There is a good correlation between Eaton and test pressures in normally pressured intervals in three wells and overpressured intervals in two wells. Eaton pressure estimates underestimate overpressured direct pressure measurements in four wells by up to 13 MPa. This is consistent with overpressure being generated (at least in part) by a fluid expansion mechanism or lateral transfer of overpressure. The Eaton pressures in one well are, on average, 11 MPa lower than hydrostatic pore pressure recorded in direct pressure measurements below the Muderong Shale. The sediments in this well appear to be overcompacted due to exhumation. Mud weights can be used as a proxy for pore pressure in shales where direct pressure measurements are not available in the adjacent sandstones. The Eaton pressure estimates are consistent with mud weight in the Gearle Siltstone and Muderong Shale in 4 of the 8 wells studied. The Eaton pressures are on average 10 Mpa in excess of mud weight in the Muderong Shale and Gearle Siltstone in three wells. It is unclear whether the predicted Eaton pressures in these three wells accurately reflect pore pressure (i.e. the mud weights do not accurately reflect pore pressure), or whether they are influenced by changes in shale mineralogy (because the gamma ray filter does not differentiate between shale mineralogy).
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10

Burstein, Leonid. "Friction Force of the Sliding Surface with Pores Having a Semicircular Cross Section Form". International Journal of Surface Engineering and Interdisciplinary Materials Science 4, n.º 2 (julio de 2016): 1–22. http://dx.doi.org/10.4018/ijseims.2016070101.

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A theoretical solution of the mathematical model is represented for obtaining the hydrodynamic pressure and friction force of the non-contacting sliding surfaces with pores having a semicircular cross section form. The expressions for the hydrodynamic pressure, shear stress, and friction force were obtained for a control cell that includes the inside and outside of the pore areas. The pore radii have been studied in the range from 0.5µm to about 18 µm. The parametric study of the pore performance is obtained with the specially written MATLAB program used the theoretically defined expressions. It is found that better performance in terms of positive hydrodynamic pressure and optimal friction forces can be achieved with proper selection of pore and outside of pore sizes. Better hydrodynamic pressures were observed at the gap-pore radii and cell-pore radii ratios range between 0.5 … 1 and 2.5 … 5, respectively. The maximal friction forces are achieved at pore radii values about 0.64 of the cell dimensions, which correspond to a r1 range of about 5 … 13 µm.
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Tesis sobre el tema "Pore Pressure"

1

SILVEIRA, BRUNA TEIXEIRA. "3D PORE PRESSURE ESTIMATION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31857@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE EXCELENCIA ACADEMICA
Nos projetos de engenharia de poço, o conhecimento das pressões é fundamental para o planejamento do poço e otimização do processo construtivo. Em geral, as estimativas de pressão de poros são feitas baseadas em análises unidimensionais de poços de correlação e dependem da experiência do analista responsável. Tais estimativas não contemplam todos os dados de uma região e muitas vezes dados não são bem aproveitados. Neste trabalho, é apresentada uma metodologia para estimativa de pressão de poros tridimensional, onde as propriedades dos poços da mesma região foram extrapoladas para toda área através da ferramenta geoestatística. A partir desta extrapolação, foi possível obter-se perfis sintéticos em qualquer locação dentro da região delimitada com maior confiabilidade, enriquecer a compreensão global da região modelada e finalmente construir um cubo tridimensional de pressão de poros utilizando os modelos de Eaton e Bowers, baseando-se no critério que a região apresenta a mesma tendência de compactação.
The knowledge of pore pressures of rocks is critical to several aspects of petroleum the well design and planning. Usually, in the petroleum industry, estimations are based on 1D analyses of the analogues wells and depend on the professional experience. Moreover, estimations do not consider the whole base data of the field. In this dissertation, is presented a methodology for 3D pore pressure estimation, where well data is calculated for the whole area applying a geostatistical tool to build the 3D properties model. From that, it was possible to make more credible synthetics well logs at any location, enrich the whole area comprehension, and also, to build the pore pressure cube based on Eaton and Bowers pore pressure estimations models.
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2

Accary, Abdallah. "Experimental characterization of the interstitial pore pressure of wet concrete under high confining pressure". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI040/document.

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L'objectif principal de cette thèse est d'identifier expérimentalement la pression interstitielle d'un béton très humide sous haute pression de confinement. Ce travail fait partie d'un projet plus général visant à comprendre le comportement des structures en béton soumises à un impact au cours duquel, un état de contraintes triaxiales élevées se produit au sein du matériau. Ces structures en béton, souvent massives, gardent un taux de saturation assez élevé durant leur durée de vie. La quantité d'eau libre dans les pores du béton a un rôle prépondérant sur son comportement sous confinement élevé par rapport à d'autres paramètres du matériau (par exemple: rapport eau / ciment ou porosité du béton). Sous une telle charge, la fermeture de la porosité se produit et provoque une augmentation de la pression interstitielle qui n'a été jamais mesurée.Une nouvelle technique de mesure de pression interstitielle en utilisant la presse triaxiale Giga est proposée dans la première partie de cette étude. Elle consiste à remplacer l'échantillon de béton (14 cm en longueur) par un autre plus petit (8 cm de longueur) et une enclume de collecte d'eau (6 cm de longueur) placé en dessous. Cette enclume est composée de deux parties: un bouchon mobile équipé d'un joint d'étanchéité torique permettant l'accès à l'espace libre de la cellule et d’une cellule équipée des micro-trous en contact avec l'échantillon de béton. Deux types de capteurs de pression ont été développés durant cette thèse, un capteur type Hydrostatique et un de type Membrane. Chacun des deux capteurs de pression est placé dans l'espace libre de l’enclume avant chaque essai. Lorsque l'échantillon est sous compression triaxial à fort confinement, l’eau libre de l’échantillon est drainée dans la cavité par le biais des micro- trous. La conception de chaque capteur, la protection de l’ensemble et les essais d'étalonnage des capteurs de pression sont discutés. La deuxième partie de cette thèse est dédiée aux analyses des résultats de mesure de la pression interstitielle effectuées sur des échantillons de béton de référence (R30A7). Les résultats révèlent que la pression interstitielle peut atteindre une valeur comprise entre 200 et 400 MPa sous une pression de confinement égale à 500 MPa. Une modélisation analytique, dans le cadre poro-mécanique, est développée afin d'estimer la pression interstitielle et le comportement volumétrique du béton sous confinement élevé. La comparaison des résultats de mesure et de modélisation est satisfaisante
The main objective of this PhD thesis is to identify experimentally the interstitial pore pressure of a very wet concrete under high confining pressure. This work is a part of a more general project aiming to understand the concrete behavior under impact during which, a high triaxial stress states occurs. Besides, massive concrete structures keep a saturation ratio strongly depth dependent almost their life time. The quantity of free water contained in concrete pores has a preponderant role on its behavior under high confinement compare to other material parameters (e.g: water/cement ratio or the concrete porosity). Under such loading, porosity closure occurs and causes an increase of interstitial pore pressure which is never measured.In order to perform interstitial pore pressure measurement, two configurations issued from a new testing technic have been developed using the Giga press of 3SR Lab. The technic, detailed in the first two chapters, consists in replacing the 14 cm R30A7 reference concrete sample by a smaller one with a water collect cap below it. The latter is composed of two parts: a movable plug equipped by a sealing joint permitting the access into the cap free space, and a micro-holed cap which is accosted on the concrete sample. A deformable sensor is placed into the free space of the water collect cap. Thus, when the sample is pressurized at high confinement, the interstitial water inside the concrete is transmitted to the sensor through cap micro-holes. The design, protection and calibration of each sensor are discussed.The second part of this thesis is dedicated for pore pressure analysis results. This latter seems to reach high values ranging from 250 till 400 MPa for 500 MPa of confinement. The concrete volumetric behavior under drained condition is lower than the saturated concrete under undrained condition. The collected data reveals that pore pressure increases linearly with the confining pressure within a slope of 0.7.An analytical modeling, within the poro-mechanical framework, is developed in order to estimate the pore pressure and concrete volumetric behavior under high confinement. The model shows promising results while comparing it to the experimental values
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Brehaut, Richard Jeremy. "Groundwater, Pore Pressure and Wall Slope Stability – a model for quantifying pore pressures in current and future mines". Thesis, University of Canterbury. Geological Sciences, 2009. http://hdl.handle.net/10092/4465.

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The Hamersley Province, located approximately 1200 km north of Perth, Western Australia forms part of the southern Pilbara craton, an extensive area of Band Iron Formations (BIF). The area has a high economic significance due to several enrichment stages of the country rock (BIF) resulting in several large high-grade iron ore deposits. Mount Whaleback near Newman and Mount Tom Price are the largest deposits, where reserves have been estimated at 1400 Mt and 900 Mt respectively. These ore bodies have been quantified as being high grade resources at approximately 64 % iron, with a high lump to fines ratio, and low impurities. The Mount Tom Price ore body is a hematite-rich ore, associated with a variety of shale and some dolomitic units (MacLeod et al., 1963, MacLeod, 1966, Taylor et al., 2001, Morris, 1980). The local hydrogeology of the Mount Tom Price area involves two main aquifer systems. The Dales Gorge member of the Brockman Iron Formation with contributions from the upper mineralised section of Footwall zone make up the main semi confined aquifer within the area. The underlying low permeability Mount McRae Shale and Mount Sylvia Shale lithologies separate a secondary aquifer which is located within the Wittenoom Formation. A dewatering program within Mount Tom Price has been ongoing since installation in 1994. Within the open pit mining industry, pits depths are increasingly being deepened as the easily accessible surface ore has been removed. This involves excavating pit walls below the existing groundwater table, which can lead to instabilities within pit walls. Added to this is the timing and economic considerations which need to be accounted for in a working mine. As dewatering and depressurisation are pivotal to the extraction of ore resources below the groundwater table, there can often be considerable time pressures to maintain planned mine developments (Hall, 2003). The South East Prongs pit, located within the Mount Tom Price mine, holds some of the most valued low impurity, high grade hematite ore. Structurally the South East Prongs is unique as the deposit lies in the base of a steeply dipping double plunging syncline, intersected by the Southern Batter Fault which runs parallel in strike to the Turner Syncline. The current pit floor of South East Prongs is located at 600 mRL. The long term development plan for the western end of this pit includes a further 30 m of excavation to a final depth of 570 mRL. This currently poses a number of stability issues that require resolution before any development can be undertaken. A conceptual understanding of flow dynamics within structurally complex wall rock environment has been generated through the utilisation of finite element numerical modelling. The complex structural setting within the northern wall of the South East Prongs has shown to interact with high conductivity lithologies to promote preferential flow of groundwater from the underling Wittenoom Formation aquifer. Recharge to the semi confined DG aquifer occurs as groundwater travels up shear zones within the South East Prongs Fault Zone before migrating along Brunos Band. An investigation into alternative methods of depressurisation has been recommended to ensure the ongoing management of pore water pressures within the northern pit wall during planned pit cut backs. Limiting recharge from the WF to the pit through stated preferential flow paths has been identified as a potential issue when the remaining DG aquifer is removed. Maintaining the proposed dewatering buffer will be difficult to achieve using the current system. The ability to design optimal pit shells for access and ore recovery as well as an effective dewatering and depressurisation system relies heavily on the a sound geological model. Further to this, time allocations to ensure forward planning deadlines are met can be significantly interrupted if adjustments to initial plans are required.
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CRUZ, NOELIA VICTORIA VALDERRAMA. "3D PORE PRESSURE MODELING FROM WELL DATA". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15134@1.

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AGÊNCIA NACIONAL DE PETRÓLEO
A modelagem tridimensional (3D) de gradiente de pressões de poros geralmente é feita utilizando dados sísmicos e calibrada com dados de poços, não sendo comum na indústria de petróleo a geração de modelos 3D baseados exclusivamente em dados de poços. A utilização de dados de poços para modelos unidimensionais do gradiente de pressão de poros, contudo, é trivial. Neste trabalho são apresentadas modelagens 3D de pressão de poros pelo método de Eaton e pelo método de Bowers, exclusivamente a partir de dados de poços (14) de um campo brasileiro. A metodologia utilizada foi baseada no programa Drillowrks 3D, da Knowledge Systems, sendo considerado apenas o fenômeno da subcompactação como possível mecanismo gerador das sobrepressões. Embora os dados sísmicos sejam os mais usados na indústria de petróleo e gás para a modelagem 3D de pressão de poros, um estudo de caso apresentado neste trabalho mostra que o uso de dados de poços para a modelagem 3D de pressão de poros é satisfatório, atingindo-se erros inferiores a 1ppg para ambas as metodologias, em relação a medidas diretas de pressão de poros.
Tridimensional (3D) modeling of pore pressure gradient is usually based on seismic data and calibrated with well data. Tridimensional models based exclusively in well data are not common in the oil industry. However, well data are regulary used to derive unidimensional models of the pore pressure gradient. The current work presents 3D models of pore pressure gradient using the Eaton method and Bowers method, derived from 14 wells data in a Brazilian field. The methodology used was based in the software Drillowrks 3D, from Knowledge Systems. The undercompaction mechanism was considered as the overpressure generator. Although the seismic data are the most commonly used in oil and gas industry for 3D pore pressure modeling, a case study presented herein shows that using wells data for 3D pore pressure modeling is satisfactory, with errors less than 1ppg in both methods in respect to direct measurements of pore pressure.
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5

Gaber, Ahmed Yaseen 1962. "Pore-water pressure debonding of asphaltic concrete". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277077.

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The report presents an evaluation of a modification to an asphalt-debonding test procedure when used with a water debonding apparatus developed at the University of Arizona, the Pore-Water Pressure Debonding Device. The method being modified is that outlined by Jimenez in his report "Testing for Debonding of Asphalt from Aggregates". A regular test specimen, 4 inches in diameter by 2½ inches high, is water-saturated at 122°F and subjected to repeated pore-water pressure varying from 5 to 30 psi. The above factors are kept constant and the following ones are varied: air void content, stress frequency, stress repetition, stress duration and testing temperature. Test results of the modified testing procedure demonstrated the following trend: the higher the value of any of the aforementioned test variables, i.e., the void content, stress frequency, stress repetition, or stress duration, or any combination of these variables, the greater the loss of the mix resistance to stripping.
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6

Larson-Robl, Kylie M. "PORE PRESSURE MEASUREMENT INSTRUMENTATION RESPONSE TO BLASTING". UKnowledge, 2016. http://uknowledge.uky.edu/mng_etds/30.

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Coal mine impoundment failures have been well documented to occur due to an increase in excess pore pressure from sustained monotonic loads. Very few failures have ever occurred from dynamic loading events, such as earthquakes, and research has been done regarding the stability of these impoundment structures under such natural seismic loading events. To date no failures or damage have been reported from dynamic loading events caused by near-by production blasting, however little research has been done considering these conditions. Taking into account that current environmental restrictions oblige to increase the capacity of coal impoundments, thus increasing the hazard of such structures, it is necessary to evaluate the effects of near-by blasting on the stability of the impoundment structures. To study the behavior of excess pore pressure under blasting conditions, scaled simulations of blasting events were set inside a controlled sand tank. Simulated blasts were duplicated in both saturated and unsaturated conditions. Explosive charges were detonated within the sand tank at various distances to simulate different scaled distances. Information was collected from geophones for dry and saturated scenarios and additionally from pressure sensors under saturated conditions to assess the behavior of the material under blasting conditions.
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7

O'Donnell, Christopher. "The effect of pore pressure on sediment transport". Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399157.

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Li, Kim Mui S. T. "Pore pressure in concrete : theory and triaxial tests". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233289.

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9

Bernabé, Yves. "Permeability and pore structure of rocks under pressure". Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/57818.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1986.
Microfiche copy available in Archives and Science
Includes bibliographies.
by Yves Bernabe.
Ph.D.
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10

Vestman, Marcus. "Modeling of pore pressure in a railway embankment". Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71373.

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LKAB and Trafikverket want to increase the maximum allowed axial load from 30 tons to 32,5 tons for the northern part of Malmbanan. There are ongoing investigations of the condition of the railway with the current axial load of 30 tons. The investigations do not include one of Trafikverket's concerns about the condition of the railway. That question is how the periodical load from trains affect the stability and maintenance cost of the railway embankment. The aim of this thesis is therefore to do a preliminary investigation of how the excess pore pressure is developed in the railway embankment during periodical loading and an attempt to model it the help of PLAXIS2D, a finite element software. PLAXIS2D has been used to model a simplified section of section km 1449+820 that is subjected by periodical loading with an axial load of 30 tons. There are 6 created models in the thesis where model 2-6 origin from model 1 but with some minor changes. The changes between the models are the train speed, groundwater level, width of the embankment and load. The periodical load applied in all models has been assumed to load the embankment with a periodical shape of a sinus curve. From the models, the distribution of the effective stress and excess pore pressure have been measured. The total displacement and the magnitude of excess pore pressure in different measuring points in the embankment have also been measured. These results have been used to analyze why there are certain points in the embankment which accumulate excess pore pressure. In the models, measuring points have also been created beneath the sleeper and in the embankment toe where total displacement and effective stress have been measured to relate and see if the response in stress and displacements are trustworthy. It was concluded that accumulation of excess pore pressure is relative high in the embankment toe due to the stress distribution and slope stability. The embankment is developing large shear stresses in the embankment toe to resist against slope failure. The excess pore pressure is recommended to be measured in the embankment toe, but it is also recommended to develop the model further since it does not consider any dynamics and neither soil stiffening or soil softening which limit the possibility to analyze liquefaction in detail.
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Libros sobre el tema "Pore Pressure"

1

Fay, Kurt F. von. Review of negative pore pressure: Its measurement, and testing of the CRL apparatus. Denver, Colo: Geotechnical Branch, Division of Research and Laboratory Services, Engineering and Research Center, 1985.

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Institution, British Standards. British standard method for measurement of the equivalent pore size of fabrics (bubble pressure test) ... . London: B.S.I., 1986.

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Holbrook, Philip W. Pore pressure through Earth's mechanical systems: The force balanced physics of the Earth's sedimentary crust. Houston, Tex: Force Balanced Publications, 2001.

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Dunn, J. R. Pore pressures in consolidating clay layers. Birmingham: University of Birmingham, 1994.

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University of Wyoming. Dept. of Civil and Architectural Engineering. Traffic signal pole research (damping). Laramie, WY: Dept. of Civil and Architectural Engineering, University of Wyoming, 2001.

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Grupos de pressão no Congresso Nacional: Como a sociedade pode defender licitamente seus direitos no poder legislativo. São Paulo, Brasil: Maltese, 1994.

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Op den Kamp, Claudy. The Greatest Films Never Seen. NL Amsterdam: Amsterdam University Press, 2018. http://dx.doi.org/10.5117/9789462981393.

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Orphan works, or artworks for which no copyright holder is traceable, pose a growing problem for museums, archives, and other heritage institutions. As they come under more and more pressure to digitize and share their archives, they are often hampered by the uncertain rights status of items in their collections. The Greatest Films Never Seen: The Film Archive and the Copyright Smokescreen uses the prism of copyright to reconsider human agency and the politics of the archive, and asks what the practical implications are for educational institutions, the creative industries, and the general public.
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Coster, Maggy Lizaire-De. Analyse du discours de presse: Profil de deux hebdomadaires haïtiens des Etats-Unis, Haïti en marche et Haïti-observateur, et analyse de contenu de l'incendie de l'Eglise Saint Jean Bosco, base du père Jean-Bertrand Aristide. Port-au-Prince, Haïti: Editions Choucoune, 1996.

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Śląski ruch narodowy pod naciskiem polskiego i niemieckiego nacjonalizmu na tle politycznej historii Górnego Śląska w latach 1848-1947 =: Nacyjowy ruch Ślōnski pode presǒm polskigo a niymieckigo nacyjonalizmusa wedle geszichte polityki Wiyrchnego Ślōnska we rokach 1848-1947 = Silesian national movement under the pressure of Polish and German nationalism as seen against the background of political history of Upper Silesia 1848-1947. Zabrze: Narodowa Oficyna Śląska, 2006.

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1959-, Carter Cynthia, Branston Gill y Allan Stuart 1962-, eds. News, gender, and power. London: Routledge, 1998.

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Capítulos de libros sobre el tema "Pore Pressure"

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Hendry, Michael T. "Pore Pressure". En Selective Neck Dissection for Oral Cancer, 1. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-12127-7_226-1.

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Hendry, Michael T. "Pore Pressure". En Encyclopedia of Earth Sciences Series, 732. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_226.

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Reid, Mark E. "Pore-Water Pressure*". En Encyclopedia of Natural Hazards, 772–73. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-1-4020-4399-4_272.

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Nilsson, Lars-Olof. "Pore Water Pressure". En Methods of Measuring Moisture in Building Materials and Structures, 87–91. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74231-1_11.

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Gullco, Robert S. y Malcolm Anderson. "Pore pressure review". En Elements of Rock Physics and Their Application to Inversion and AVO Studies, 25–50. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003261773-4.

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Whittaker, Alun. "Pore Pressure Evaluation Techniques". En Theory and Evaluation of Formation Pressures, 73–135. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5355-0_4.

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Dasgupta, Troyee y Soumyajit Mukherjee. "Pore Pressure Determination Methods". En Sediment Compaction and Applications in Petroleum Geoscience, 19–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13442-6_3.

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Brace, W. F. "Pore Pressure in Geophysics". En Flow and Fracture of Rocks, 265–73. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm016p0265.

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Hantschel, Thomas y Armin I. Kauerauf. "Pore Pressure, Compaction and Tectonics". En Fundamentals of Basin and Petroleum Systems Modeling, 31–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-72318-9_2.

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Dasgupta, Troyee y Soumyajit Mukherjee. "Pore Pressure in Different Settings". En Sediment Compaction and Applications in Petroleum Geoscience, 91–99. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13442-6_7.

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Actas de conferencias sobre el tema "Pore Pressure"

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Jimenez, J. M., T. Harrold, P. Rouillé y G. Saceda. "Managed Pressure Drilling for Pore Pressure Detection, Two Case Studies". En Second EAGE Workshop on Pore Pressure Prediction. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201900507.

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Czerniak, M. "RhoVe Method Empirical Pore Pressure Transform". En First EAGE Workshop on Pore Pressure Prediction. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201700077.

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Al Salmi, H. "Pore-pressure Prediction Using Multiresolution Analysis". En Second EAGE Workshop on Pore Pressure Prediction. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201900502.

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Gorbunov, Y. "Pore Pressure Prediction in HPHT Wells". En Second EAGE Workshop on Pore Pressure Prediction. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201900514.

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Dvorkin, Jack y Ali Mese. "Rock Physics Of Pore Pressure". En 7th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.217.228.

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Sayers, Colin M. y Marta J. Woodward. "Enhanced Seismic Pore-Pressure Prediction". En Offshore Technology Conference. Offshore Technology Conference, 2001. http://dx.doi.org/10.4043/13044-ms.

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Mueller, Birgit, Johannes Altmann, A. Dorner, Tobias Müller y Mark Tingay. "Modelling Pore Pressure/Stress Coupling". En First Southern Hemisphere International Rock Mechanics Symposium. Australian Centre for Geomechanics, Perth, 2008. http://dx.doi.org/10.36487/acg_repo/808_107.

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Biteau, J. J., M. O. Spencer, B. Benazet y C. Longis. "Origin of Abnormal Pressures, Hydrodynamism and Pore Pressure Prediction". En 76th EAGE Conference and Exhibition - Workshops. Netherlands: EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20140597.

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Flemmings, P. "Keynote: Breaking New and Old Ground in Pore Pressure and Fracture Pressure Prediction". En Third EAGE Workshop on Pore Pressure Prediction. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202038017.

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Bartetzko, A., J. H. Figenschou, S. Schimschal, S. Wessling y T. Dahl. "Real-time Pore Pressure Modelling Workflow Automation". En First EAGE Workshop on Pore Pressure Prediction. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201700058.

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Informes sobre el tema "Pore Pressure"

1

Teufel, L. W. Influence of pore pressure and production-induced changes in pore pressure on in situ stress. Office of Scientific and Technical Information (OSTI), febrero de 1996. http://dx.doi.org/10.2172/208315.

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Bennett, Richard H. Hydrodynamic Stresses Driving Pore Pressure Changes in Sandy Coastal Sediments. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 1997. http://dx.doi.org/10.21236/ada629408.

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Christensen, Nikolas I. Laboratory Studies of Pore Pressure, Attenuation, Anisotropy and Inhomogeneities in the Oceanic Crust. Fort Belvoir, VA: Defense Technical Information Center, enero de 1997. http://dx.doi.org/10.21236/ada334836.

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Aston, T. R. C. Theoretical in situ strata reservoir and pore pressure calculations for material from no. 26 colliery, N.S. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/304786.

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SUETNOVA, Elena y Vladimir CHERNIAVSKY. DIFFERENCES OF VISCOSITY OF ACCUMULATED SEDIMENTARY LAYERS AS A REASON OF POROSITY AND PORE PRESSURE VARIATIONS IN BASIN FILL. Cogeo@oeaw-giscience, septiembre de 2011. http://dx.doi.org/10.5242/iamg.2011.0139.

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Mavko, G., T. Vanorio, S. Vialle y N. Saxena. Advanced Technologies for Monitoring CO2 Saturation and Pore Pressure in Geologic Formations: Linking the Chemical and Physical Effects to Elastic and Transport Properties. Office of Scientific and Technical Information (OSTI), marzo de 2014. http://dx.doi.org/10.2172/1148579.

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Kinikles, Dellena y John McCartney. Hyperbolic Hydro-mechanical Model for Seismic Compression Prediction of Unsaturated Soils in the Funicular Regime. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, diciembre de 2022. http://dx.doi.org/10.55461/yunw7668.

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A semi-empirical elasto-plastic constitutive model with a hyperbolic stress-strain curve was developed with the goal of predicting the seismic compression of unsaturated sands in the funicular regime of the soil-water retention curve (SWRC) during undrained cyclic shearing. Using a flow rule derived from energy considerations, the evolution in plastic volumetric strain (seismic compression) was predicted from the plastic shear strains of the hysteretic hyperbolic stress-strain curve. The plastic volumetric strains are used to predict the changes in degree of saturation from phase relationships and changes in pore air pressure from Boyle’s and Henry’s laws. The degree of saturation was used to estimate changes in matric suction from the transient scanning paths of the SWRC. Changes in small-strain shear modulus estimated from changes in mean effective stress computed from the constant total stress and changes in pore air pressure, degree of saturation and matric suction, in turn affect the hyperbolic stress-strain curve’s shape and the evolution in plastic volumetric strain. The model was calibrated using experimental shear stress-strain backbone curves from drained cyclic simple shear tests and transient SWRC scanning path measurements from undrained cyclic simple shear tests. Then the model predictions were validated using experimental data from undrained cyclic simple shear tests on unsaturated sand specimens with different initial degrees of saturation in the funicular regime. While the model captured the coupled evolution in hydro-mechanical variables (pore air pressure, pore water pressure, matric suction, degree of saturation, volumetric strain, effective stress, shear modulus) well over the first 15 cycles of shearing, the predictions were less accurate after continued cyclic shearing up to 200 cycles. After large numbers of cycles of undrained shearing, a linear decreasing trend between seismic compression and initial degree of saturation was predicted from the model while a nonlinear increasing-decreasing trend was observed in the cyclic simple shear experiments. This discrepancy may be due to not considering post shearing reconsolidation in the model, calibration of model parameters, or experimental issues including a drift in the position of the hysteretic shear-stress strain curve. Nonetheless, the trend from the model is consistent with predictions from previously- developed empirical models in the funicular regime of the SWRC. The developments of the new mechanistic model developed in this study will play a key role in the future development of a holistic model for predicting the seismic compression across all regimes of the SWRC.
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Lohne, Arild, Arne Stavland, Siv Marie Åsen, Olav Aursjø y Aksel Hiorth. Recommended polymer workflow: Interpretation and parameter identification. University of Stavanger, noviembre de 2021. http://dx.doi.org/10.31265/usps.202.

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Injecting a polymer solution into a porous medium significantly increases the modeling complexity, compared to model a polymer bulk solution. Even if the polymer solution is injected at a constant rate into the porous medium, the polymers experience different flow regimes in each pore and pore throat. The main challenge is to assign a macroscopic porous media “viscosity” to the fluid which can be used in Darcy law to get the correct relationship between the injection rate and pressure drop. One can achieve this by simply tabulating experimental results (e.g., injection rate vs pressure drop). The challenge with the tabulated approach is that it requires a huge experimental database to tabulate all kind of possible situations that might occur in a reservoir (e.g., changing temperature, salinity, flooding history, permeability, porosity, wettability etc.). The approach presented in this report is to model the mechanisms and describe them in terms of mathematical models. The mathematical model contains a limited number of parameters that needs to be determined experimentally. Once these parameters are determined, there is in principle no need to perform additional experiments.
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Miyamoto, Seiichi y Rami Keren. Improving Efficiency of Reclamation of Sodium-Affected Soils. United States Department of Agriculture, diciembre de 2000. http://dx.doi.org/10.32747/2000.7570569.bard.

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Sodium affected soils, along with salt-affected soils, are distributed widely in irrigated areas of the arid and semi-arid region of the world. Some of these soils can and must be reclaimed to meet the increasing demand for food, and existing irrigated lands must be managed to reduce salinization and alkalization associated with deteriorating irrigation water quality. This project was conducted for examining ways to reduce the use of chemical amendments and large quantities of leaching water for reclaiming sodic soils or for preventing soil sodification, We hypothesized that sodicity of calcareous soils irrigated with moderately sodic irrigation water can be controlled by maximizing dissolution of soil CaCO3. The work performed in Israel has shown that dissolution of CaCO3 can be enhanced by elevating the CO2 partial pressure in soils, and by increasing pore water velocity. The concentration of Ca in pore water was at an order of 1.5 mmolc L-1 at a CO2 partial pressure of 5 kPa, which is sufficient to maintain SAR below 4 at salinity of irrigation water of 0.5 dS m-1 or less. Incorporation of crop residue at a flesh weight of 100 Mg ha-1 reduced the exchangeable Na percentage from 19 to 5%, while it remained 14% without crop residue application These findings indicate a possibility of preventing soil sodification with appropriate crop rotation and residue management without chemical amendments, provided that soils remain permeable. In the case of highly sodic soils, dissolution of CaCO3 alone is usually insufficient to maintain soil permeability during initial leaching. We examined the effect of salinity and sodicity on water infiltration, then developed a way to estimate the amendments required on the basis of water infiltration and drainage characteristics, rather than the traditional idea of reducing the exchangeable Na percentage to a pre-fixed value. Initial indications from soil column and lysimeter study are that the proposed method provides realistic estimates of amendment requirements. We further hypothesized that cultivation of salt-tolerant plants with water of elevated salinity can enhance reclamation of severely Na-affected soils primarily through improved water infiltration and increased dissolution of CaCO3 through respiration. An outdoor lysimeter experiment using two saline sodic Entisols sodded with saltgrass for two seasons did not necessarily support this hypothesis. While there was an evidence of increased removal of the exchangeable Na originally present in the soils, the final salinity and sodicity measured were lowest without sod, and highest when sodded. High transpiration rates, coupled with low permeability and/or inadequate leaching seemed to have offset the potential benefits of increased CaCO3 dissolution and subsequent removal of exchangeable Na. Although vegetative means of reclaiming sodic soils had been reported to be effective in sandy soils with sufficient permeability, additional study is needed for its use in saline sodic soils under the high evaporative demand. The use of cool season grass after initial salt leaching with CaCl2 should be explored. Results obtained from this project have several potential applications, which include the use of crop residues for maintaining sodium balance, the use of CaCl2 for initial leaching of poorly permeable clayey sodic soils, and appraisal of sodicity effects, and appropriate rates and types of amendments required for reclamation
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R. H. Nilson y S. K. Griffiths. Condensation pressures in small pores: An analytical model based on density functional theory. Office of Scientific and Technical Information (OSTI), febrero de 1999. http://dx.doi.org/10.2172/751009.

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