Relevant bibliographies by topics / Soil structure – Mathematical models

Academic literature on the topic 'Soil structure – Mathematical models'

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Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Soil structure – Mathematical models"

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He, Bin, and Jun Long Lu. "Stress Analysis of Underground Arch Structure." Advanced Materials Research 243-249 (May 2011): 938–41. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.938.

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To research the safety of an underground defense project and the impact to other buildings, applying basic mechanics principles, established two types of mathematical model for arch about the project, and analyzed stress in different directions of ground arch structure. The data shows that the results were very different in different mathematical models, and mathematical models should be considered as close to actual stress situation in structural analysis. In the structural analysis involved soil, spatial finite element model is more accurate and reasonable than truss finite element model.
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Mitra, Girija Bhushan. "Spiral Structure of 7 Å Halloysite: Mathematical Models." Clays and Clay Minerals 61, no. 6 (December 1, 2013): 499–507. http://dx.doi.org/10.1346/ccmn.2013.0610602.

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Belik, Aleksandra A., Anna A. Kokoreva, Andrei G. Bolotov, Aleksandr V. Dembovetskii, Victoria N. Kolupaeva, Dmitry V. Korost, and Alexei N. Khomyak. "Characterizing macropore structure of agrosoddy-podzolic soil using computed tomography." Open Agriculture 5, no. 1 (December 24, 2020): 888–97. http://dx.doi.org/10.1515/opag-2020-0080.

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AbstractThe agrosoddy-podzolic soil (Eutric Albic Glossic Retisol (Abruptic, Loamic, Aric, Cutanic)) is typical for Moscow Oblast and is used for agricultural purposes, resulting in use of various agrochemicals and pesticides. The presence of macropores and cracks in such soils leads to preferential water and substance transfer and nonequilibrium conditions. Therefore, it is important to study the numerical characteristics of the pore space of soils to adjust mathematical models of substance transfer. Undisturbed soil monoliths 10 cm in diameter taken from Ap (from 0 to 30 cm) and E, BE horizons (from 30 to 50 cm) were investigated under the field moisture conditions and after saturation using the tomographic core analyzer RKT-180 with the resolution of 200 μm/pixel. Using the X-ray computer tomography, it has been established that the plough layer of the agrosoddy-podzolic soil contains over 7% of macropores larger than 1 mm, while the subsurface layer has a porosity of about 3%. After saturation, some of the inter-aggregate pores overlap, which leads to a decrease in the total porosity to 4% in the upper and 2% in lower horizons, as well as increase in the average pore diameter. The number of macropores determined by tomographic analysis is one third higher than the values calculated using pedotransfer functions for this soil. The data obtained in this paper are recommended for use in national scenarios of migration of substances (pesticides, agrochemicals, salts) in soils.
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Belik, Aleksandra A., Anna A. Kokoreva, Andrei G. Bolotov, Aleksandr V. Dembovetskii, Victoria N. Kolupaeva, Dmitry V. Korost, and Alexei N. Khomyak. "Characterizing macropore structure of agrosoddy-podzolic soil using computed tomography." Open Agriculture 5, no. 1 (January 1, 2020): 888–97. http://dx.doi.org/10.1515/opag-2020-0080.

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Abstract The agrosoddy-podzolic soil (Eutric Albic Glossic Retisol (Abruptic, Loamic, Aric, Cutanic)) is typical for Moscow Oblast and is used for agricultural purposes, resulting in use of various agrochemicals and pesticides. The presence of macropores and cracks in such soils leads to preferential water and substance transfer and nonequilibrium conditions. Therefore, it is important to study the numerical characteristics of the pore space of soils to adjust mathematical models of substance transfer. Undisturbed soil monoliths 10 cm in diameter taken from Ap (from 0 to 30 cm) and E, BE horizons (from 30 to 50 cm) were investigated under the field moisture conditions and after saturation using the tomographic core analyzer RKT-180 with the resolution of 200 μm/pixel. Using the X-ray computer tomography, it has been established that the plough layer of the agrosoddy-podzolic soil contains over 7% of macropores larger than 1 mm, while the subsurface layer has a porosity of about 3%. After saturation, some of the inter-aggregate pores overlap, which leads to a decrease in the total porosity to 4% in the upper and 2% in lower horizons, as well as increase in the average pore diameter. The number of macropores determined by tomographic analysis is one third higher than the values calculated using pedotransfer functions for this soil. The data obtained in this paper are recommended for use in national scenarios of migration of substances (pesticides, agrochemicals, salts) in soils.
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Chandrasekhar, Parvathy, Janis Kreiselmeier, Andreas Schwen, Thomas Weninger, Stefan Julich, Karl-Heinz Feger, and Kai Schwärzel. "Why We Should Include Soil Structural Dynamics of Agricultural Soils in Hydrological Models." Water 10, no. 12 (December 15, 2018): 1862. http://dx.doi.org/10.3390/w10121862.

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Surface soil structure is sensitive to natural and anthropogenic impacts that alter soil hydraulic properties (SHP). These alterations have distinct consequences on the water cycle. In this review, we summarized published findings on the quantitative effects of different agricultural management practices on SHP and the subsequent response of the water balance components. Generally, immediately after tillage, soils show a high abundance of large pores, which are temporally unstable and collapse due to environmental factors like rainfall. Nevertheless, most hydrological modeling studies consider SHP as temporally constant when predicting the flow of water and solutes in the atmosphere-plant-soil system. There have been some developments in mathematical approaches to capture the temporal dynamics of soil pore space. We applied one such pore evolution model to two datasets to evaluate its suitability to predict soil pore space dynamics after disturbance. Lack of knowledge on how dispersion of pore size distribution behaves after tillage may have led to over-estimation of some values predicted by the model. Nevertheless, we found that the model predicted the evolution of soil pore space reasonably well (r2 > 0.80 in most cases). The limiting factor to efficiently calibrate and apply such modeling tools is not in the theoretical part but rather the lack of adequate soil structural and hydrologic data.
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Yusupov, R. A., S. Axrolov, N. M. Mirzanova, and A. N. Nasiriddinov. "MATHEMATICAL MODELS OF GEOFILTRRATION AND GEOMIGRATION IN POROUS MEDIA WITH FRACTAL STRUCTURE." PHYSICAL AND MATHEMATICAL SCIENCES 4, no. 1 (April 30, 2020): 40–46. http://dx.doi.org/10.26739/2181-0656-2020-4-5.

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In this study 2-D linear models are coming from generalised, Boussinesq eqution describing geofiltration in soils with fractal structures are presented. In this study are presented too mathematical models geomigration of contaminations with groundwater in classical way and in soils with fractal structures
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Yusupov, R. A., Sh S. Axrolov, N. M. Mirzanova, and A. N. Nasiriddinov. "MATHEMATICAL MODELS OF GEOFILTRRATION AND GEOMIGRATION IN POROUS MEDIA WITH FRACTAL STRUCTURE." TECHNICAL SCIENCES 6, no. 3 (June 30, 2020): 21–27. http://dx.doi.org/10.26739/2181-9696-2020-6-4.

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In this study 2-D linear models are coming from generalised, Boussinesq eqution describing geofiltration in soils with fractal structures are presented. In this study are presented too mathematical models geomigration of contaminations with groundwater in classical way and in soils with fractal structures.
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Yusupov, R. A., Sh S. Axrolov, N. M. Mirzanova, and A. N. Nasiriddinov. "MATHEMATICAL MODELS OF GEOFILTRRATION AND GEOMIGRATION IN POROUS MEDIA WITH FRACTAL STRUCTURE." TECHNICAL SCIENCES 5, no. 3 (May 30, 2020): 39–45. http://dx.doi.org/10.26739/2181-9696-2020-5-6.

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In this study 2-D linear models are coming from generalised, Boussinesq eqution describing geofiltration in soils with fractal structures are presented. In this study are presented too mathematical models geomigration of contaminations with groundwater in classical way and in soils with fractal structures
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Ergina, E. I., R. V. Gorbunov, and E. F. Stashkina. "Maximum humus horizon thickness as a criterion for identifying the soil standards of the plain Сrimea." Rossiiskaia selskokhoziaistvennaia nauka, no. 4 (August 19, 2019): 39–42. http://dx.doi.org/10.31857/s2500-26272019439-42.

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When identifying the main categories of soil in the structure of the regional Red Book of soils, it is necessary to focus on typical soils formed taking into account the zonal soil-ecological conditions of the territory. The criterion for the extraction of soil standards can be the initial, pre-agrogenic thickness of the humus horizon, which fully realizes the soil-forming potential of natural factors of climax full-profile soils. But the search for such sites is associated with a number of methodological difficulties. A way out of this situation can be a mathematical modeling of the formation of the humus horizon of soils, which allows you to quantify the legitimacy of the allocation of soil standards in the structure of the Red Book of soils of the Crimea. The proposed method allows going to the cartographic models for determining the maximum thickness of the humus horizon. Analysis of the presented material allows asserting that in the majority of modern soils of agricultural lands of the Crimea, the profiles are destroyed by 30% compared with the calculated maximum thickness of the humus horizon, which takes into account the zonal soil formation processes. That predetermines the search for soil standards only in areas that did not function previously in agrogenic conditions, most often, these are protected areas that take into account the peculiarities of the zonal process of soil formation.
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Polyakov, Sergey, P. Enin, and A. Parfenov. "AUTOMATIC CONTROL STRUCTURE FOR FORESTRY MATERIALS." Actual directions of scientific researches of the XXI century: theory and practice 8, no. 1 (October 26, 2020): 223–27. http://dx.doi.org/10.34220/2308-8877-2020-8-1-223-227.

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The article discusses a method of extreme control of the driving effects of the microclimate, which consists in keeping the objective function at the point of extremum for the control system. To solve the problem of extreme management, it is necessary to introduce computerization of the control and development of forest planting material. This will allow you to collect statistical information for the entire time of observation of plant growth. The primary task here is the analysis of observations and the possibility of generating regulatory influences from the microprocessor control system of the microclimate of the greenhouse. From literature sources, the stages of development of forest seedlings are known, for which data on the natural growth of seedlings and seedlings based on processing of statistical material are obtained. To date, recent studies show that there are no necessary mathematical models, both in growth and in the development of planting material under changing conditions and the nature of growth, and in time periods. Thus, objects of sheltered soil can be attributed from the point of view of the object of control and regulation to systems with variable parameters. That is, they can be characterized as unknown mathematical models.
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Dissertations / Theses on the topic "Soil structure – Mathematical models"

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Romanel, Celso. "A global-local approach for dynamic soil-structure interaction analysis of deeply embedded structures in a layered medium." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184762.

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The most popular method for dynamic soil-structure interaction analysis is the finite element method. The versatility in problems involving different materials and complex geometries is its main advantage, yet the FEM can not simulate unbounded domains completely. Several schemes have been proposed to overcome this shortcoming, such as the use of either imperfect or perfect transmitting boundaries, infinite elements and hybrid techniques. However, most of them were derived on the assumption that the soil mass can be represented as a homogeneous material despite the fact that stratified soil deposits are a common occurrence in nature. A hybrid method is proposed in this research for soil-structure interaction analysis in the frequency domain involving a multilayered linear elastic half-space. The near field region (structure and a portion of soil surrounding it) is modeled by finite elements while the far field formulation is obtained through the classical wave propagation theory based on the assumption that the actual scattered wave fields can be represented by a set of line sources. Traction reciprocity between the two regions is satisfied exactly, while the displacement continuity across the common interface is enforced in a least-squares sense. The two-dimensional system is excited by harmonic body waves (P and SV) propagating with oblique incidence. The structure can be considered either on the surface or deeply embedded in the multilayered half-space. Analytic solutions for the far field domain is obtained through the combined response of four simple problems that take into account the overall effects of the incident, reflected and scattered wave fields. The delta matrix technique is employed in order to eliminate the loss of precision problem associated with the Thomson-Haskell matrix method in its original form. Special numerical schemes are used to transform the solution from the κ- into the ω-plane due to the presence of poles on the path of integration. The few numerical examples studied in this research validate the proposed hybrid technique, but the relatively high computational cost required for evaluation of the Green's functions is still a serious drawback. Some suggestions are made to minimize the problem as well as to extend this technique to cases involving material attenuation and forced vibrations.
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Romanel, Celso 1952. "DYNAMIC SOIL-STRUCTURE INTERACTION IN A LAYERED MEDIUM." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276511.

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The most popular method in dynamic soil-structure interaction analysis is the finite element method. The versatility in problems involving different materials and complex geometries is its main advantage, yet FEM can not simulate unbounded domains completely. A hybrid method is proposed in this research, which models the near field (structure and surrounding soil) by finite elements and the far field by a continuum approach. The system is excited by monochromatic body waves (P and SV) propagating with oblique incidence and harmonic time dependence. The far field problem is solved using Thomson-Haskell formulation associated with the delta matrix technique. The soil profile does not contain any soft layer and the layers are assumed to be linearly elastic, isotropic, homogeneous and perfectly bonded at the interfaces. Two-dimensional (in-plane) formulation is considered and the analysis is performed on both k- and o-planes through time and spatial Fourier transforms of the field equations and boundary conditions. (Abstract shortened with permission of author.)
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Uchaipichat, Anuchit Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Experimental investigation and constitutive modelling of thermo-hydro-mechanical coupling in unsaturated soils." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/22068.

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A thermo-elastic-plastic model for unsaturated soils has been presented based on the effective stress principle considering the thermo-mechanical and suction coupling effects. The thermo-elastic-plastic constitutive equations for stress-strain relations of the solid skeleton and changes in fluid content and entropy for unsaturated soils have been established. A plasticity model is derived from energy considerations. The model derived covers both associative and non-associative flow behaviours and the modified Cam-Clay is considered as a special case. All model coefficients are identified in terms of measurable parameters. To verify the proposed model, an experimental program has been developed. A series of controlled laboratory tests were carried out on a compacted silt sample using a triaxial equipment modified for testing unsaturated soils at elevated temperatures. Imageprocessing technique was used for measuring the volume change of the samples subjected to mechanical, thermal and hydric loading. It is shown that the effective critical state parameters M, ???? and ???? are independent of temperature and matric suction. Nevertheless, the shape of loading collapse (LC) curve was affected by temperature and suction. Furthermore, the temperature change affected the soil water characteristic curve and an increase in temperature caused a decrease in the air entry suction. The simulations from the proposed model are compared with the experimental results. The model calibration was performed to extract the model parameters from the experimental results. Good agreement between the results predicted using the proposed model and the experimental results was obtained in all cases.
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Yamamoto, Nobutaka. "Numerical analysis of shallow circular foundations on sands." University of Western Australia. School of Civil and Resource Engineering, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0038.

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This thesis describes a numerical investigation of shallow circular foundations resting on various types of soil, mainly siliceous and calcareous sands. An elasto-plastic constitutive model, namely the MIT-S1 model (Pestana, 1994), which can predict the rate independent behaviour of different types of soils ranging through uncemented sands, silts and clays, is used to simulating the compression, drained triaxial shear and shallow circular foundation responses. It is found that this model provides a reasonable fit to measured behaviour, particularly for highly compressible calcareous sands, because of the superior modelling of the volumetric compression. The features of the MIT-S1 model have been used to investigate the effects of density, stress level (or foundation size), inherent anisotropy and material type on the response of shallow foundations. It was found that the MIT-S1 model is able to distinguish responses on dilatant siliceous and compressible calcareous sands by relatively minor adjustment of the model parameters. Kinematic mechanisms extracted from finite element calculations show different deformation patterns typical for these sands, with a bulb of compressed material and punching shear for calcareous sand, and a classical rupture failure pattern accompanied by surface heave for siliceous sand. Moreover, it was observed that the classical failure pattern transforms gradually to a punching shear failure pattern as the foundation size increases. From this evidence, a dimensional transition between these failure mechanisms can be defined, referred to as the critical size. The critical size is also the limiting foundation size to apply conventional bearing capacity analyses. Alternative approaches are needed, focusing mainly on the soil compressibility, for shallow foundations greater than the critical size. Two approaches, 1-D compression and bearing modulus analyses, have been proposed for those foundation conditions. From the validations, the former is applicable for extremely large foundations, very loose soil conditions and highly compressible calcareous materials, while the latter is suitable for moderate levels of compressibility or foundation size. It is suggested that appropriate assessment of compression features is of great importance for shallow foundation analysis on sand.
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Chin, Victor B. L. "The dynamic response of pile-soil interfaces during pile driving and dynamic testing events." Monash University, Dept. of Civil Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9421.

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Bienen, Britta. "Three-dimensional physical and numerical modelling of jack-up structures on sand." University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0208.

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Mobile offshore jack-up drilling rigs are not custom-designed for a particular location but rated for typical operating characteristics, like water depths. They may be deployed at a number of different sites during their design life. Under the current guidelines, the jack-up is required to be assessed for its suitability for each new proposed location, assuming environmental loading conditions due to wind, waves and current corresponding to a 50-year return period storm applicable to the site. Traditionally, these assessments have been performed in two dimensions, simplifying the jack-up to a plane frame and the loading conditions to be in-plane with the rig's 'axis of symmetry'. This thesis introduces a computer program, named SOS_3D, for the fluid-structure-soil interaction analysis of jack-up response in three dimensions. Extensive experimental series have been performed to provide evidence for the generalisation of the foundationsoil interaction model to general six degree-of-freedom loading conditions and its applicability to load paths and stress levels relevant to jack-up spudcans. These experiments included (1) 1g single footing tests, (2) centrifuge single footing tests and (3) centrifuge model jack-up tests. The latter tests highlighted differences in response and mode of failure depending on the loading direction of the jack-up and re-iterated the importance of three-dimensional modelling. The numerical program SOS_3D introduced early in this thesis was shown to represent a useful tool for the prediction of jack-up behaviour under general combined loading in three dimensions. It provided reasonably good, conservative predictions of the experimentally measured jack-up behaviour.
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Manivannan, Ganeshalingam Aerospace Civil &amp Mechanical Engineering Australian Defence Force Academy UNSW. "Viscoplastic modelling of embankments on soft soils." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2005. http://handle.unsw.edu.au/1959.4/38743.

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A major instrumented geosynthetic reinforced approach embankment was constructed to 5.5 m elevation above ground, with prefabricated vertical drains, over a soft compressible clay deposit at Leneghan, Newcastle, Australia in May 1995. The field monitoring of settlements for over six years shows that the embankment manifests significant creep. The instrumentation, field performance and the finite element analyses for predicting the long-term performance of this embankment are described in this thesis. The maximum settlement of 1.1 m was observed one year after the completion of construction. However, the embankment continued to settle at a rate of 0.4 mm/day for the next 5 years. The horizontal displacements of 0.09-0.14 m at various locations and the maximum reinforcement strains of 0.67% were recorded. A numerical model was developed to perform a fully coupled large deformation elasto-viscoplastic finite element analysis for this performance prediction based on creep model proposed by Kutter and Sathialingam (1992). The foundation soil was modelled with creep material behaviour using six noded linear strain triangular elements. A well-documented case history ??? Sackville embankment, New Brunswick, Canada was analysed using this model as a benchmark problem and the model was found to predict all the behaviour characteristics reasonably well. The results obtained from finite element analysis using this model are shown to be in reasonable agreement with the observed performance of Leneghans embankment in terms of settlements, horizontal displacements, excess pore pressures and geosynthetic strains. But, the prediction of settlements was less than satisfactory beyond April 1999. Finite element analyses were performed to study the sensitivity of this embankment behaviour on the variation of hydraulic conductivity values and geosynthetic reinforcement properties. This sensitivity study indicated that the kv variation, the kh/kv ratio and the nominal values of geosynthetic properties adopted in the benchmark analysis are reasonable enough for the long-term behaviour prediction.
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Abdelhedi, Anouar. "Modélisation de l'effet de groupe dans le clouage des pentes." Paris 6, 1986. http://www.theses.fr/1986PA066042.

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De récentes expérimentations réalisées sur des sites réels, ont permis de mettre en évidence la complexité du comportement de groupe de pieux dans une pente instable. On fait le point sur les méthodes existantes et on approfondit l'étude du mécanisme du comportement du sol au voisinage d'une rangée de pieux en se limitant au phénomène d'interaction sol-pieu. Apres étude bibliographique du phénomène donnant lieu à la programmation de deux des méthodes les plus significatives, on réalise deux approches en déformation: modélisation en continuum élastique permettant de prendre en compte une géométrie de maillage des pieux quelconques et d'appliquer au groupe une sollicitation en déplacement très générale, modélisation s'appuyant sur la méthode des éléments finis et sur un modèle bidimensionnel horizontal simulant l'écoulement du sol entre une rangée de pieux. Comparaison de diverses méthodes.
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Barrett, Gary Edward. "Infiltration in water repellent soil." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28618.

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Observations made at Goat Meadows - a small sub-alpine basin located near Pemberton, British Columbia -demonstrated that a layer which is either water repellent or has only a limited affinity for water is present at most vegetated sites. The layer is typically a few centimetres in thickness, and is usually located at or near the top of the profile: it was present only in the zone of accumulation of organic matter. The spatial distribution of the layer did not appear to be related to the distribution of any particular species of plant. Sampling of sub-alpine sites in the Cascade, Selkirk, and Purcell Mountains indicated that such layers are common in the alpine - sub-alpine ecotone of southern British Columbia. The relationship between ponding depth and infiltration rate was explored through experiments conducted on samples collected near Ash Lake, in Goat Meadows. These samples were chosen for analysis because the repellent layer was in excess of thirty centimetres thick at this site. Infiltration rates remained below 2x10⁻⁹ m/s for all samples, even given ponding depths of up to forty centimetres. Breakthrough of liquid water was not observed, even after one month, which implies that most of the infiltration occurred as vapour transfer. In order to observe the movement of liquid water through water repellent media, a plexiglas cell was constructed. A synthetic water repellent sand with uniform surface properties was used as the medium. It was found that up to some critical depth, there was no entry of water into the medium. As the ponding depth was increased in steps, the front would advance in steps: it remained stationary between these step-increases in ponding depth. As the front advanced, protuberances or "fingers" began to develop. At some critical ponding depth, a finger would grow without bound. These observations pose a challenge to existing models of infiltration, since it appears that heterogeneity at the scale of individual pores must be invoked to explain them, but it is usually assumed that the properties of a porous medium are continuous at this scale. The thermodynamics of filling and emptying of pores is considered with emphasis on the effects of pore shape and of variations in the physicochemical properties at the scale of the pore. This thermodynamic analysis provides the conceptual basis for development of a model of infiltration in which pore-scale heterogeneity is preserved. Although it was not developed as such, the model follows the approach of cellular automata, in which local relations between pores or "cells" govern the behaviour of the system. The model replicated the observations of infiltration into synthetic water repellent porous media well: both the halting advance of the front as the ponding depth was increased and the development of fingers were simulated. The fact that such complex behaviour was predicted using only a simple set of physically based rules confirms the power of the approach.
Arts, Faculty of
Geography, Department of
Graduate
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Sorooshian, Soroosh, and Vijai Kumar Gupta. "Improving the Reliability of Compartmental Models: Case of Conceptual Hydrologic Rainfall-Runoff Models." Department of Hydrology and Water Resources, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/614011.

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Books on the topic "Soil structure – Mathematical models"

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Kolář, Vladimír. Modelling of soil-structure interaction. Amsterdam: Elsevier, 1989.

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Kolář, Vladimír. Modelling of soil-structure interaction. Amsterdam: Elsevier, 1989.

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Dłużewski, Janusz Maciej. Numerical modelling of soil-structure interactions in consolidation problems. Warszawa: Wydawnictwa Politechniki Warszawskiej, 1993.

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Kolář, Vladimír. Studie nového modelu podloží staveb. Praha: Academia, nakl. Československé akademie věd, 1986.

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Gomez, Jesus E. Development of an improved numerical model for concrete-to-soil interfaces in soil-structure interaction analyses. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1999.

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Zheng, David Wei. Influence of soil food web structure on decomposition in terrestrial ecosystems: Theoretical investigations of donor-controlled linear decomposition systems. Uppsala: Institutionen för ekologi och miljövård, Sveriges lantbruksuniversitet, 1993.

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International Symposium on Modelling Soil-Water-Structure Interactions (1988 Delft, Netherlands). Modelling soil-water-structure interactions: SOWAS 88 : proceedings of the International Symposium on Modelling Soil-Water-Structure Interactions, Delft, August 29-September 2, 1988. Rotterdam: A.A. Balkema, 1988.

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Shen, Jie. Soil-machine interactions: A finite element perspective. New York: Marcel Dekker, 1998.

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Shen, Jie. Soil-machine interactions: A finite element perspective. New York: Marcel Dekker, 1998.

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Wolf, John P. Finite-element modelling of unbounded media. Chichester, England: Wiley, 1996.

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Book chapters on the topic "Soil structure – Mathematical models"

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van den Driessche, P. "Spatial Structure: Patch Models." In Mathematical Epidemiology, 179–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78911-6_7.

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Frauenthal, James C. "Analysis of Age-Structure Models." In Mathematical Ecology, 117–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-69888-0_6.

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Wu, Jianhong. "Spatial Structure: Partial Differential Equations Models." In Mathematical Epidemiology, 191–203. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78911-6_8.

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Nisbet, R. M., and W. S. C. Gurney. "The Formulation of Age-Structure Models." In Mathematical Ecology, 95–115. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-69888-0_5.

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Etheridge, Alison. "Spatial Structure." In Some Mathematical Models from Population Genetics, 89–107. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16632-7_6.

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Levin, Simon A. "Population Models and Community Structure in Heterogeneous Environments." In Mathematical Ecology, 295–320. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-69888-0_12.

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Nisbet, R. M., W. S. C. Gurney, and J. A. J. Metz. "Stage Structure Models Applied in Evolutionary Ecology." In Applied Mathematical Ecology, 428–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-61317-3_18.

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Bodnár, Tomáš, Antonio Fasano, and Adélia Sequeira. "Mathematical Models for Blood Coagulation." In Fluid-Structure Interaction and Biomedical Applications, 483–569. Basel: Springer Basel, 2014. http://dx.doi.org/10.1007/978-3-0348-0822-4_7.

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Meek, Jethro W. "Simplified Soil Dynamics Using Cone Models." In Developments in Dynamic Soil-Structure Interaction, 285–306. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1755-5_12.

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Caudai, Claudia, Emanuele Salerno, Monica Zoppè, and Anna Tonazzini. "A Statistical Approach to Infer 3d Chromatin Structure." In Mathematical Models in Biology, 161–71. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23497-7_12.

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Conference papers on the topic "Soil structure – Mathematical models"

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Tsai, C. S., and H. C. Su. "Investigation of Soil-Structure Interaction and Higher-Mode Effects on Dynamic Response of Base-Isolated Structure Founded on Half Space." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97775.

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This paper attempts to investigate the effects of soil-structure interaction (SSI) and higher modes on the dynamic responses of base-isolated structures through closed-form solutions for a superstructure, seismic isolator, and soil system under various conditions, comprising the cases of rigid and half-space foundations. The proposed system considers continuum media for both the superstructure and soil foundation, which can take the effects of higher modes into account, along with a discontinuous layer with a governing equation that interprets the mechanical behavior of the base-isolation system. Then, the closed-form solutions in terms of well-known frequency and impedance ratios under various conditions of soil foundations were obtained through rigorous mathematical derivations and validations by collapsing the entire system to a single degree-of-freedom system in structural dynamics and well-known cases of wave propagation in elastic solids. The closed-form solutions derived in this study explicitly revealed the characteristics of the SSI and higher mode effects in influencing the seismic behavior of base-isolated structures. Furthermore, the SSI effects on the dynamic responses of the entire system were extensively evaluated. The conclusive results of this paper will be useful for understanding the SSI and higher mode effects on the dynamic responses of base-isolated structures.
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El-Drieny, S. A., I. A. Metwally, and M. M. El-Saadawi. "Influence of Driven Rods on Performance of Grounding Grids in Stratified Soils." In International Joint Power Generation Conference collocated with TurboExpo 2003. ASMEDC, 2003. http://dx.doi.org/10.1115/ijpgc2003-40115.

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The variation in soil structure has a great influence on the grounding grid performance. This influence can be measured in terms of ground resistance, touch and step potentials. This paper presents a comprehensive experimental study for the influence of adding driven rods on the performance of grounding grids. The study is applied on three constructed scale models. The models have been performed to simulate a single-, double- and triple-layer soils. A comparison between results obtained experimentally and that computed by mathematical equations is introduced.
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Tortoriello, Miguel A., Luis J. Lima, Ana C. Cobas, and Renso A. Cichero. "Timber bodies strength of materials: Fundamental principles, test specimens proposal." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.1112.

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<p>To reduce the economic cost of a Timber Structure, the first condition is to have a “rational” Structural Code, that is, a Code supported by research and a specific theory. To establish a rational Structural Timber Code, a specific theoretical support is needed. The objective of this paper is to cooperate in the construction of this theoretical support. To design timber structures, it is necessary to have mathematical models able to reproduce the resistance of timber bodies under different solicitations. In this paper, a “road map” to arrive to a specific Strength of Materials of Timber Bodies is proposed. This theory will be the tool needed to develop the mathematical models whose quantification will be obtained by testing “basic test specimens” obtained from timber of any particular timber building (like in concrete or soil mechanics). Finally, a “basic test specimen” for practical application of the theory is proposed. In this case, the experimental support is referred to “willow” wood.</p>
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Chen, Wei, and Wei Liu. "Numerical and Experimental Analysis of Convection Heat Transfer in a Lean-To Type Greenhouse." In ASME 2004 International Solar Energy Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/isec2004-65009.

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In this paper, heat transfer and flow in a lean-to passive solar greenhouse has been studied. A mathematical model based on energy equilibrium and a one-dimensional mathematical model for the unsaturated porous medium have been founded and developed to predict the temperature and moisture content in soil and the enclosed air temperature in the greenhouse. On the condition that plant and massive wall is neglected, the air is mainly heated by the soil surface in the greenhouse, which absorbs the incident solar radiation. With increase in depth, the variation of the temperature and moisture content in soil decreases on account of ambient, and the appearance of the peak temperature in soil postpones. Solar irradiation absorber, heat storage and insulation are the main effects of the north massive wall on greenhouse, which is influenced by the structure and the material. The specific heat capacity and thermal conductivity of wall material have a remarkable effect on the north wall temperature. The build-up north wall with thermal insulation material may be chosen for greenhouse. The temperature distribution and gas flow in greenhouse is influenced by the cover material of the inside surface of the north wall. All results should be taken into account for a better design and run of a greenhouse.
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Zhang, Huayong, and Liming Dai. "Surface Runoff and Its Erosion Energy in a Partially Continuous System: An Ecological Hydraulic Model." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10607.

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Plant community and ground surface form a partially continuous ecosystem in conveying surface runoff and its erosion energy. It is one of the mechanisms for maintaining the stable development of a partially continuous ecosystem that the plant community and ground surface dissipate the erosion energy produced by surface runoff so as to control the soil erosion process of the ecosystem. Based on the energy fundamentals of hydraulics and by idealizing the structure of plant community, we obtain an ecological hydraulic model in this paper through a series of mathematical deductions, which includes three equations: (1) the equation on approaching energy balance of surface runoff moving across plant community and ground surface; (2) the equation on the process of dissipating energy of surface runoff by plant community and ground surface in an ecosystem; (3) the equation on the relationship among the pattern of plant community, ground surface and energy dissipation of surface runoff. Theoretically, the ecological hydraulic model can be used to calculate the dynamical process of energy dissipation of surface runoff by plant community and ground surface in a partially continuous ecosystem and to discuss the optimization of plant community pattern in a given section of the ecosystem.
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Malhotra, Sanjeev. "Seismic Soil-Pile-Structure Interaction: Analytical Models." In GeoFlorida 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41095(365)310.

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Etheridge, Alison M. "Drift, draft and structure: some mathematical models of evolution." In Stochastic Models in Biological Sciences. Warsaw: Institute of Mathematics Polish Academy of Sciences, 2008. http://dx.doi.org/10.4064/bc80-0-7.

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Chiarella, Carl, Sara Pasquali, and Wolfgang J. Runggaldier. "On Filtering in Markovian Term Structure Models." In Proceedings of the International Conference on Mathematical Finance. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812799579_0012.

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COLIZZA, V., F. GARGIULO, J. J. RAMASCO, A. BARRAT, and A. VESPIGNANI. "NETWORK STRUCTURE AND EPIDEMIC WAVES IN METAPOPULATION MODELS." In International Symposium on Mathematical and Computational Biology. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814271820_0005.

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Sengar, Kaushal Pratap, and Kandasamy Chandrasekaran. "A Mathematical Modelling of Grounding System Buried in Multilayer Soil Structure." In 2020 IEEE First International Conference on Smart Technologies for Power, Energy and Control (STPEC). IEEE, 2020. http://dx.doi.org/10.1109/stpec49749.2020.9297689.

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