Analysis of Rainfall Infiltration Law in Unsaturated Soil Slope

Zhang, Guirong; Ya-jun, Qian; Zhang-chun, Wang; Zhao, Bo

doi:10.1155/2014/567250

Cited by 27 publications

(24 citation statements)

References 14 publications

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“…In their study the ratio of rainfall intensity to saturated water permeability is a fundamental property in the deformation response of unsaturated soils subjected to rainfall infiltration. The analysis results of Zhang et al (2014) also shows that rainfall intensity is one of most important factors affecting the rainfall infiltration for unsaturated slope. The effect of different rainfall intensity on the behavior of saturatedunsaturated seepage and stability behavior of different soil slopes TECHNICAL NOTE *Assistant Professor, Dept.…”

Section: Introductionmentioning

confidence: 83%

The effect of soil type on matric suction and stability of unsaturated slope under uniform rainfall

et al. 2015

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It is well understood that rainfall infiltration decreases the unsaturated shear strength of soil slope due to reduction in matric suction as the wetting front moves through it. However, how much the matric suction is reduced that may affect slope stability results is still unknown. The paper presents the numerical results of wetting front depth, matric suction and stability results in term of reliability index for a single rainfall intensity. The analyses are for five soils using the modified Mohr-Coulomb failure criterion in conjunction with a finite element saturated-unsaturated seepage model. The numerical results show that the matric suction results are differently affected for soils with rainfall infiltration. The change in reliability index result is insignificant as long the soil remains unsaturated as the wetting front moves. The reliability index results are however become noticeable if the infiltrated rainfall produces saturation and positive pore-water pressure. The difference in results may be attributed to the wetting front depth and its saturation that depends on saturated-unsaturated hydraulic conductivity and matric suction head.

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Section: Introductionmentioning

confidence: 83%

The effect of soil type on matric suction and stability of unsaturated slope under uniform rainfall

et al. 2015

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“…Infiltration and drainage are referred as the respective entry of water into soil and downward water movement below soil profile. Apart from the mode of water application these hydrological processes are dependent on the readiness of soil pores to absorb and conduct water from the surface to underlying drier profile layers (Hillel, ; Zhang et al ., ). However, there are several factors influencing soil infiltration and drainage and these could be broadly related to soil type, ground surface and rainstorm characteristics.…”

Section: Introductionmentioning

confidence: 97%

“…However, there are several factors influencing soil infiltration and drainage and these could be broadly related to soil type, ground surface and rainstorm characteristics. From the soil type the main factors are soil textural and structural pore size distribution (Leonard and Andrieux, ), soil depth (Ffolliott et al ., ), antecedent soil water content (Mayor et al ., ), and presence of impervious horizon(s) in the soil profile (Zhang et al ., ). Ground surface related factors are presence of crust (Bothma et al ., ; Zhao et al ., ), type and density of vegetal cover (Mayor et al ., ; Zhao et al ., ) and slope gradient (Zhang et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…From the soil type the main factors are soil textural and structural pore size distribution (Leonard and Andrieux, ), soil depth (Ffolliott et al ., ), antecedent soil water content (Mayor et al ., ), and presence of impervious horizon(s) in the soil profile (Zhang et al ., ). Ground surface related factors are presence of crust (Bothma et al ., ; Zhao et al ., ), type and density of vegetal cover (Mayor et al ., ; Zhao et al ., ) and slope gradient (Zhang et al ., ). Other ground factors include soil surface structure, organic carbon content, roughness, stoniness, and presence and distribution of cracks, bio‐channels and fissures (Mayor et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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Characterizing infiltration and internal drainage of South African dryland soils

Mavimbela

Rensburg

2016

Earth Surf Processes Landf

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Surface infiltration and internal drainage properties of five soil types from arid drylands of South Africa were studied under double ring infiltrometer, rainfall simulation plots (1 m2) and instantaneous drainage plots (9 m2). Changes in soil water content during 40 minute rainfall simulation for a rainstorm with average intensity of 1.61 mm min−1 and 30 day drainage period were measured at various depths by 1.5 m long capacitance soil water measuring (DFM) probe. Different (P < 0.05) mean surface steady infiltration rate ranged from 0.05 to 4.47 mm min−1 and had a negative power relationship (R2 = 0.65) with horizon clay plus fine silt content. Power regression (R2 ≥ 86%) described rainstorm infiltration and obtained steady rates within an average time of 15 minutes. Mean total infiltrated soil water content was lowest (P < 0.05) from surface horizons with either 47.7% clay plus fine silt content or bulk density of 1.91 g cm−3 and exchangeable sodium of not less than 44 mg kg−1. Surface horizons with lower surface bulk density and total sand fraction of more than 72% had infiltrated depth and mean total infiltrated soil water content up to 40 cm deeper and 0.55 mm mm−1 greater, respectively. Drainage rate at drained upper limit calculated from the Wilcox drainage model (R2 ≤ 0.97%) was 0.2 mm day−1 or less were from underlying horizons with either clay plus fine silt of 45% or soft calcium carbonate. Higher drainage rate with accumulative drainage amount greater than 60 mm were from soil profile horizons with clay plus fine silt content of less than 20% and above unity steady infiltration rates. Rainstorm infiltration and drainage rates was shown to depend on permeability and coarseness of the respective soil surface and subsurface horizons; a phenomenon critical for harnessing rain and flood water to recharge groundwater. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Consequently, shallow landslides may often occur within the vadose zone under unsaturated soil conditions [5][6][7]. The prediction of flow in transient conditions is important in engineering practice while considering the stability of unsaturated soil slopes [8][9][10][11][12] or poromechanical coupling influence for rainfall-induced shallow landslides in unsaturated soils [13,14].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Transient Flow in Unsaturated Geomaterials for Rainfall-Induced Landslides Using a Novel Spacetime Collocation Method

Liu

et al. 2018

Geofluids

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The modeling of transient flow in unsaturated soils for rainfall-induced landslides using a novel spacetime collocation method is presented. A numerical solution obtained in the spacetime coordinate system is approximated by superpositioning Trefftz basis functions satisfying the linearized Richards equation for collocation points on the spacetime domain boundary. The Gardner exponential model is adopted to derive the linearized Richards equation to describe the soil-water characteristic curve in unsaturated soils. To deal with the rainfall-induced landslides, the infinite slope stability analysis coupled with the proposed meshless method with the consideration of the fluctuation of time-dependent matric suction is developed. The proposed method is validated for several test problems. Application examples of transient modeling of flow for rainfall-induced landslides in homogenous unsaturated soils are also conducted. Numerical results demonstrate that the proposed method is highly accurate to deal with transient flow in unsaturated soils for rainfall-induced landslides. In addition, it is found that the numerical method using the Richards equation with the Gardner model may provide a promising solution for different soil textures.

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Analysis of Rainfall Infiltration Law in Unsaturated Soil Slope

Cited by 27 publications

References 14 publications

The effect of soil type on matric suction and stability of unsaturated slope under uniform rainfall

The effect of soil type on matric suction and stability of unsaturated slope under uniform rainfall

Characterizing infiltration and internal drainage of South African dryland soils

Modeling of Transient Flow in Unsaturated Geomaterials for Rainfall-Induced Landslides Using a Novel Spacetime Collocation Method

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