Analytical solution to 1D coupled water infiltration and deformation in unsaturated soils

Wu, Lizhou; Zhang, Li Min

doi:10.1002/nag.742

Cited by 67 publications

(32 citation statements)

References 24 publications

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“…For instance, [6][7][8] used analytical solutions to study the effect of hydraulic parameters and rainfall conditions on the infiltration of unsaturated homogeneous and two-layered soils. These studies showed the influence of the hydrology and hydraulic parameters of the materials on changes on the pore water pressures and volumetric strains.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional experimental study of rainfall infiltration into unsaturated soil

Montoya-Domínguez

Aristizábal

Vega-Posada

2017

Rev. Fac. Ing. Univ. Antioquia

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This paper presents experimental results obtained from tests on unsaturated soil in one-dimensional columns simulating a rainfall infiltration process. Six columns composed of compacted Silty Sand were prepared to study the effects of the initial water content and rainfall intensity on the downward infiltration process. The advance of the water front was monitored using sensors to measure pore water pressure and volumetric water content installed at different locations along the height of the Silty Sand column. The test results show that the lag time, defined as the time difference from the beginning of the test to a sudden increase in the volumetric water content readings, was influenced by the soil initial water content and rainfall intensity; it is observed that the lag time is shorter at higher initial water contents and greater rainfall intensities. The results provide insights to understand the hydraulic behavior of unsaturated slopes and embankments exposed to rainfall infiltration. RESUMEN:En este artículo se presentan los resultados experimentales obtenidos a partir de ensayos en suelo parcialmente saturado en columnas unidimensionales, simulando un proceso de infiltración de lluvia. Se prepararon seis columnas de arena limosa compactada para estudiar los efectos del contenido inicial de agua y de la intensidad de la lluvia en el proceso de infiltración descendente. El avance del agua fue monitoreado usando sensores para medir la presión de poros y de contenido volumétrico de agua instalados a diferentes alturas de la columna de arena limosa. Los resultados de los ensayos muestran que el tiempo de retraso, definido como la diferencia de tiempo desde el inicio del ensayo hasta el aumento súbito en las lecturas del contenido volumétrico de agua, fue influenciado por el contenido inicial de agua en el suelo y la intensidad de la lluvia; se observa que el tiempo de retraso es más corto a mayores contenidos iniciales de agua y mayores intensidades de lluvia. Estos resultados proveen información para comprender el comportamiento hidráulico de taludes y terraplenes parcialmente saturados expuestos a la infiltración de lluvias.

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Section: Introductionmentioning

confidence: 99%

One-dimensional experimental study of rainfall infiltration into unsaturated soil

Montoya-Domínguez

Aristizábal

Vega-Posada

2017

Rev. Fac. Ing. Univ. Antioquia

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“…Based on Darcy's Law and conservation of the 1D fluid mass, combined with the stress-strain relationship applicable to normal strains proposed by Fredlund and Rahardjo [24], the 1D governing equation for partially saturated infiltration coupled with deformation in a semi-infinite domain, where the water compressibility is neglected, can be given as [11,14] …”

Section: Analytical Solution To the Coupled Infiltration In A Semi-inmentioning

confidence: 99%

“…Srivastava and Yeh [5] derived an analytical approach to describe one-dimensional rainfall infiltration towards the water table. In recent years, analytical solutions to the one-dimensional problem incorporating rainfall-induced hydromechanical coupling in unsaturated porous media have been developed [11,14,15].…”

Section: Introductionmentioning

confidence: 99%

The Role of Surface Infiltration in Hydromechanical Coupling Effects in an Unsaturated Porous Medium of Semi-Infinite Extent

Selvadurai

Yang

2017

Geofluids

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Rainfall infiltration into an unsaturated region of the earth's surface is a pervasive natural phenomenon. During the rainfall-induced seepage process, the soil skeleton can deform and the permeability can change with the water content in the unsaturated porous medium. A coupled water infiltration and deformation formulation is used to examine a problem related to the mechanics of a two-dimensional region of semi-infinite extent. The van Genuchten model is used to represent the soil-water characteristic curve. The model, incorporating coupled infiltration and deformation, was developed to resolve the coupled problem in a semi-infinite domain based on numerical methods. The numerical solution is verified by the analytical solution when the coupled effects in an unsaturated medium of semi-infinite extent are considered. The computational results show that a numerical procedure can be employed to examine the semi-infinite unsaturated seepage incorporating coupled water infiltration and deformation. The analysis indicates that the coupling effect is significantly influenced by the boundary conditions of the problem and varies with the duration of water infiltration.

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“…Wu and Zhang (2009) presented an analytical solution to one-dimensional coupled water infiltration and deformation, which is derived by adopting the exponential functional forms for soil-water characteristic curve and permeability function.…”

Section: Coupled Hydro-mechanical Analysismentioning

confidence: 99%

Stability analysis of rainfall-induced slope failure: a review

Zhang

et al. 2011

Proceedings of the Institution of Civil Engineers - Geotechnica

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240

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Rainfall is one of the most significant triggering factors for slope failures in many regions around the world.Numerous research studies have been conducted to investigate infiltration of rainwater into a slope, and the effect of water infiltration on slope stability. In this paper, a review of existing research on infiltration analysis and slope stability analysis under rainfall infiltration is presented. Studies on infiltration analysis with conceptual models, analytical analysis and numerical modelling are first reviewed. The typical pore water pressure profiles in the slope are then discussed. Subsequently, recent developments in analyses of slope instabilities under rainfall conditions using the limit equilibrium method and coupled hydro-mechanical modelling are summarised, and major findings on critical hydrological factors related to rainfall-induced landslides are summarised and discussed. Finally, several research topics are suggested for further study.

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Analytical solution to 1D coupled water infiltration and deformation in unsaturated soils

Cited by 67 publications

References 24 publications

One-dimensional experimental study of rainfall infiltration into unsaturated soil

One-dimensional experimental study of rainfall infiltration into unsaturated soil

The Role of Surface Infiltration in Hydromechanical Coupling Effects in an Unsaturated Porous Medium of Semi-Infinite Extent

Stability analysis of rainfall-induced slope failure: a review

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