Analytical Analysis of Rainfall Infiltration Mechanism in Unsaturated Soils

Zhan, Tony L. T.; Ng, Charles Wang Wai

doi:10.1061/(asce)1532-3641(2004)4:4(273)

Cited by 104 publications

(46 citation statements)

References 19 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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“…The storage term in unsaturated flow is dependent on the suction, and can be characterized by the SWCC [47]. Hydraulic properties are influenced by the uncertainty of a and n. This predictive method for unsaturated hydraulic conductivity was used in numerical software such as SEEP/W.…”

Section: Water Flow Through Unsaturated Soilmentioning

confidence: 99%

Uncertainty of the Soil–Water Characteristic Curve and Its Effects on Slope Seepage and Stability Analysis under Conditions of Rainfall Using the Markov Chain Monte Carlo Method

Liu

Luo

Huang

et al. 2017

Water

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Abstract:It is important to determine the soil-water characteristic curve (SWCC) for analyzing slope seepage and stability under the conditions of rainfall. However, SWCCs exhibit high uncertainty because of complex influencing factors, which has not been previously considered in slope seepage and stability analysis under conditions of rainfall. This study aimed to evaluate the uncertainty of the SWCC and its effects on the seepage and stability analysis of an unsaturated soil slope under conditions of rainfall. The SWCC model parameters were treated as random variables. An uncertainty evaluation of the parameters was conducted based on the Bayesian approach and the Markov chain Monte Carlo (MCMC) method. Observed data from granite residual soil were used to test the uncertainty of the SWCC. Then, different confidence intervals for the model parameters of the SWCC were constructed. The slope seepage and stability analysis under conditions of rainfall with the SWCC of different confidence intervals was investigated using finite element software (SEEP/W and SLOPE/W). The results demonstrated that SWCC uncertainty had significant effects on slope seepage and stability. In general, the larger the percentile value, the greater the reduction of negative pore-water pressure in the soil layer and the lower the safety factor of the slope. Uncertainties in the model parameters of the SWCC can lead to obvious errors in predicted pore-water pressure profiles and the estimated safety factor of the slope under conditions of rainfall.

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“…[6], [20], [33]. Nu merous researches have been done to study the extreme rainfall induced soil slope failures with several methods such as full scale experiment, field observation, and numerical method [9], [11], [22], [34], [36]. Finite element method (FEM ) or Fin ite difference method (FDM) is nu merical method that is widely applied for analysis of water or rain seepage through soil slope.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Extreme Rainfall-Induced Slope Failure Using a Rainfall Infiltration-Infinite Slope Analysis Model

Chaithong¹

2017

GEOMATE

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ABSTRACT:The aim o f this paper is to propose the method for analyzing the slope response to rainfall infiltrat ion during the extreme rainfall in a mountainous area by comb ining Green -A mpt infiltrat ion model and infinite slope analysis model. The Green-A mpt infiltrat ion model is used to calculate cumulat ive infiltrat ion into the soil slope. The infinite slope analysis model is chosen to represent the shallow soil slope failure and the simplified first order second moment (SFOSM) is used to calculate the probability of failure. The reliability of the proposed model is validated using three landslide h istory cases in southern Thailand. Considering the result of calcu lation, it was found that the proposed model can be used the estimating the soil slope failure occurrence time.

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Analytical Analysis of Rainfall Infiltration Mechanism in Unsaturated Soils

Cited by 104 publications

References 19 publications

One-dimensional experimental study of rainfall infiltration into unsaturated soil

One-dimensional experimental study of rainfall infiltration into unsaturated soil

Uncertainty of the Soil–Water Characteristic Curve and Its Effects on Slope Seepage and Stability Analysis under Conditions of Rainfall Using the Markov Chain Monte Carlo Method

Analysis of Extreme Rainfall-Induced Slope Failure Using a Rainfall Infiltration-Infinite Slope Analysis Model

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