Modelling the applied vertical stress and settlement relationship of shallow foundations in saturated and unsaturated sands

Oh, Won Taek; Vanapalli, Sai K.

doi:10.1139/t10-079

Cited by 84 publications

(38 citation statements)

References 33 publications

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“…Modeling studies results (e.g. [3]- [5]) are also consistent with these observations. This fact also indicates that the SVS behavior from PLT is influenced by plate (or footing) size since different sizes result in different sizes of stress bulbs and mean stresses in soils.…”

Section: Plate Load Testsupporting

confidence: 80%

“…In this case, the concept of 'average matric suction' [3], [35] can be used as a representative matric suction value to interpret mechanical properties of a soil at a certain matric suction distribution profile. The average matric suction, Ψ is defined as a matric suction corresponding to the centroid of the suction distribution diagram from 0 to 1.5B -2B depth.…”

Section: Average Matric Suction Valuementioning

confidence: 99%

“…4) on unsaturated sandy soils. The FEA was performed using elastic-perfectly plastic model [48] extending the approach proposed by Oh and Vanapalli [3]. The square footing was modeled as a circular footing with an equivalent area (i.e., 1.13m in diameter; axisymmetric problem).…”

Section: Variation Of Svs Behaviors With Respect To Matric Suctionmentioning

confidence: 99%

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Scale Effects of Plate Load Tests in Unsaturated Soils

Vanapalli¹

2013

geomate

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ABSTRACT:The applied stress versus surface settlement (SVS) behavior from in-situ plate load tests (PLTs) is valuable information that can be used for the reliable design of shallow foundations. In-situ PLTs are commonly conducted on the soils that are typically in a state of unsaturated condition. However, in most cases, the influence of matric suction is not taken into account while interpreting the SVS behavior of in-situ PLTs. In addition, the sizes of plates used for load tests are generally smaller in comparison to real sizes of footings used in practice. Hence, in-situ PLT results should be interpreted taking account of not only matric suction but also the scale effects. In the present study, discussions associated with the uncertainties in interpreting the SVS behavior of PLTs taking account of matric suction and scale effect are detailed and discussed.

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Section: Plate Load Testsupporting

confidence: 80%

Section: Average Matric Suction Valuementioning

confidence: 99%

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Scale Effects of Plate Load Tests in Unsaturated Soils

Vanapalli¹

2013

geomate

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“…Nevertheless, it can be pointed out that most studies have been neglecting the influence of matric suction, resulting in an overestimation of the settlement of shallow foundations. Despite a growing interest in the use of matric suction for assessing the settlement, very few studies have examined the transient process inducing additional settlement of shallow foundations [7][8][9], because of the uncertainties in boundary conditions and difficulties in determining the input parameters for constitutive equations.…”

Section: Introductionmentioning

confidence: 99%

Settlement Behavior of Shallow Foundations in Unsaturated Soils under Rainfall

2017

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Shallow foundations are often situated on unsaturated zones above the groundwater table. In this study, the influence of rainfall infiltration on the settlement behavior of shallow foundations was investigated using numerical analyses. The numerical solutions were compared with experimental data from in-situ load tests. The relative importance of rainfall intensities and groundwater table positions in inducing the additional settlement of shallow foundations was examined through a series of parametric studies. Two different groundwater table positions contributing to settlements and three assorted rainfall intensities were used in the numerical analyses. Typical soil properties of two main residual soils in Korea were incorporated into the numerical analyses. Special attention is given to the sequential analysis procedure comprised of a flow analysis and deformation analysis. Load-settlement relationships obtained from the numerical methodology in the present study were in good agreement with the field measurements. Results from the parametric studies showed that the rainfall intensity plays a significant role in the settlement behavior of shallow foundations in unsaturated soils. The changes in the settlement during rainfall were also affected by the groundwater table position near the ground surface due to changes in matric suction. In addition, higher bearing capacity in response to rainfall infiltration was observed in the soil with smaller permeability function as compared to larger permeability function.

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“…The interaction soil-footing is taken into account (Breysse et al, 2005) and the soil is considered as an elastic-perfectly plastic anisotropic material (Mabrouki et al, 2010;Loukidis & Salgado, 2011;Oh & Vanapalli, 2011), which implies a better approach to actual soil behaviour.…”

mentioning

confidence: 99%

A new equation to predict the footings settlement on sand based on the finite element method

Requena-Pérez

Ayuso

Jiménez

et al. 2012

Span. j. agric. res.

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In the design of shallow foundations normally used in rural buildings on sand, the settlement criterion is more critical than the bearing capacity of the soil. Likewise, it has also been found that widely used methods to estimate the footings settlement on sand, generates differences with the observed in full scale field tests. The aim of this study was to find a new equation based on finite element method (FEM) easy to apply to estimate the footings settlement on sand. This new equation considers the effect of the depth of the founding level, the footing breadth, the equivalent soil stiffness, the Poisson's ratio and the net increase in the effective stress on settlement values. To obtain this equation, a three-dimensional finite element model was generated and subsequently validated using actual footings settlement measured during field tests. The results of settlement predictions extracted from this method are slightly better than those obtained by other methods, but this equation has the advantage of being easier and faster to apply, which implies a savings in computation time.Additional key words: granular soils; rural buildings; shallow foundations; vertical displacement. ResumenNueva ecuación para estimar el asiento de zapatas sobre arenas basado en el método de elementos finitos En el diseño de las cimentaciones superficiales normalmente utilizadas en las construcciones rurales sobre arena, el criterio de asientos es más crítico que el de capacidad de carga del suelo. Igualmente se ha encontrado que los métodos más utilizados para estimar el asiento de zapatas sobre arenas generan diferencias con los observados en ensayos de campo a escala real. El objetivo de este estudio fue encontrar una nueva ecuación, basada en el método de elementos finitos (MEF) fácil de aplicar, para estimar el asiento de zapatas sobre arena. Esta nueva ecuación considera el efecto de la profundidad de cimentación, la anchura de la zapata, la rigidez equivalente del suelo, el coeficiente de Poisson y el incremento neto de la presión efectiva sobre los valores del asiento. Para obtener esta ecuación, se generó un modelo tridimensional de elementos finitos y se validó posteriormente utilizando los asientos reales de zapatas medidos durante ensayos de campo. Los resultados de las predicciones del asiento extraídos de esta formulación son ligeramente mejores que los obtenidos por otros métodos, pero esta formulación tiene la ventaja de ser más fácil y rápida de aplicar, lo que implica un ahorro en el tiempo de cálculo con el ordenador.Palabras clave adicionales: cimentaciones superficiales; construcciones rurales; desplazamientos verticales; suelos granulares. *Corresponding author: ir1ayuje@uco.es Received: 19-04-12. Accepted: 26-09-12.Abbreviations used: Nomenclature: ARE (average relative errors); B, D (footing breadth and depth of founding level); E f , E s (footing and soil stiffness at founding level); E sz , E sinc (soil stiffness at a certain depth and increase of this stiffness per unit of depth); FEM (Finite Element...

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Modelling the applied vertical stress and settlement relationship of shallow foundations in saturated and unsaturated sands

Cited by 84 publications

References 33 publications

Scale Effects of Plate Load Tests in Unsaturated Soils

Scale Effects of Plate Load Tests in Unsaturated Soils

Settlement Behavior of Shallow Foundations in Unsaturated Soils under Rainfall

A new equation to predict the footings settlement on sand based on the finite element method

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