Numerical Analysis of Unsaturated Soil Slopes under Rainfall Infiltration Based on the Modified Glasgow Coupled Model

Cai, Guoqing; Li, Mengzi; Han, Bowen; Di, Kenan; Liu, Qianqian; Li, Jian

doi:10.1155/2020/8865179

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…ese years, more researchers devoted themselves to the field of slope stability and failure mechanism study under rainfall, involving modelling test [15][16][17][18][19][20], numerical simulation [21][22][23][24], and field monitoring [25][26][27]. As investigated, slope safety is mostly influenced by rainfall, causing the surface erosion to the slopes by runoff [28][29][30][31][32], weakening the slope soil strength while percolating into the slope body [33][34][35][36][37], and reducing the effective stress in the slope soil while saturating the slope body [38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessments of Treating Effect on Retaining Walls for Loess Slopes under Long‐Term Rainfall

Liu

Zhou

et al. 2021

Advances in Civil Engineering

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Failures of treated slope occurring in China are at a continually increasing rate, and the huge number of treated loess slopes is calling for a postevaluation; however, no mature technique is in place. Based on an actual loess slope in Shaanxi Province treated by retaining wall, indoor geotechnical and model tests were conducted, revealing the rainwater infiltration process and pressure variations behind the wall, and the processes were then adopted to perform the postevaluation of the treated slope. The results proposed that effectual measures hence needed to be taken so as to avert rainwater infiltrating along the wall face and back or flowing through the wall body, which can soften the soil of the slope bottom. Although the wet front was developed by the rainfall process, it cannot be used as the boundary between saturated and unsaturated areas. Despite the peculiarly large soil pressure upon the wall back at the top layer, the soil pressure increases to a large value and then decreases with the depth. The model test results and investigation results were used to conduct the postevaluation of the prototype slope, which formed a postevaluation frame relevant to other slope postevaluations.

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Section: Introductionmentioning

confidence: 99%

Experimental Assessments of Treating Effect on Retaining Walls for Loess Slopes under Long‐Term Rainfall

Liu

Zhou

et al. 2021

Advances in Civil Engineering

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“…Classical GA Infiltration Model. During continuous rainfall, the rainfall infiltration process of slopes is influenced by the slope water content and slope volume water [25] and the traditional GA model was initially used to analyze the saturated infiltration of slopes under rainfall conditions. e schematic diagram of GA infiltration model is shown in Figure 1, according to [26] with some modifications.…”

Section: Study Methodsmentioning

confidence: 99%

Analysis of Influencing Parameters of the Improved Model for Rainfall Infiltration in Unsaturated Tailings Soil

Yang

Hao

Cheng

et al. 2022

Advances in Civil Engineering

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The rainfall infiltration analysis method is an important method for slope stability forecast and prevention. Slope angle and unsaturated soil layers are not shown in the conventional Green-Ampt (GA) infiltration model. In this paper, based on the GA model of rainfall infiltration in tailings slopes, two aspects of slope angle and the proportion of the transition layer of the wet layer are modified. The rainfall infiltration test of unsaturated tailing soil was conducted using a self-developed large-size tailing slope model test device. The results of GA model, improved GA model, and Richards’ equation calculation model are compared. The results show that the difference between the three models is small in the free infiltration stage, but the infiltration rate is lower than that of the GA model. With the gradual increase of rainfall time into the ponding infiltration stage, the expansion depth and infiltration rate of the wetting front of the improved GA model and Richards’ equation are greater than those of the GA model. The difference between the GA model and the improved GA model and Richards’ equation for the extended depth of wetting front increases with the increase of rainfall duration, while the difference of infiltration rate changes in the opposite trend. The results of the improved GA model and Richards’ equation to calculate the expansion depth and infiltration rate of wetting fronts are consistent, and the difference basically tends to stabilize with the increase of rainfall ephemeris. The results of the improved GA model are closer to the measured data, which can provide a reference for analyzing the rainfall infiltration pattern of open pit tailing dams and slope stability research. On the basis of the improved GA model, the influence of slope angle, rain intensity, initial water content, and saturation infiltration coefficient on rainfall infiltration was analyzed, and the analysis of parameter sensitivity indexes showed that slope inclination and initial water content had a greater influence on the model.

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“…Morbidelli et al (2018) reviewed the research on infiltration models, such as models established by Green, Ampt, Horton, Philip, Brutsaert, Parlange, etc., and put forward that the natural spatial variability of soil hydraulic characteristics and that of rainfall make the estimate of infiltration has further challenges. Cai et al (2020) developed a coupled hydro mechanical model of unsaturated soil considering the effect of the microscopic pore structure, and analyzed the effects of rainfall intensity and rainfall duration on the pore pressure, fluid velocity, and displacement of the unsaturated soil slope. Some scholars adopt the saturatedunsaturated seepage theory to analyze the rainfall infiltration process of rock slope (Qin et al, 2003;Rong et al, 2005;Liu and Xu 2017;Pan et al, 2020;.…”

Section: Introductionmentioning

confidence: 99%

Rainfall Infiltration Process of a Rock Slope with Considering the Heterogeneity of Saturated Hydraulic Conductivity

2022

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In order to analyze the effects of rainfall events on the stability of an open-pit rock slope, with considering the spatial variability of saturated hydraulic conductivity, based on the unsaturated seepage theory and the random filed theory, modified functions of the unit saturation, the hydraulic conductivity (k), and the shear strength parameters are established for unsaturated slope, by using FISH and the non-intrusive stochastic method. A saturated-unsaturated seepage random field model is proposed. And then the impacts of the rainfall intensity, the rainfall duration, and the spatial variability of saturated hydraulic conductivity (ks) on the infiltration process and stability of the unsaturated rock slope are analyzed. The results show that the proposed model can estimate rainfall infiltration of rock slope accurately. Rainfall mainly affects the seepage field in the shallow layer of the slope, where a transient saturated zone can be formed. With the development of the rainfall duration, the weight of the rock mass increased, the matric suction reduced, the negative pore pressure, the degree of saturation, and the infiltration depth of the rock slope increased, and the water in the slope root connects with the initial water table gradually, the unsaturated zone shrinks, which causes the safety factor of the model decreases, but the trend of change slows down gradually. As the rainfall intensity strengthened, the infiltration depth increased and the safety factor of the slope reduced, while the changing rate increases first and then decreases. Increasing the correlation length of k can reduces the infiltration depth and safety factor of the slope. Increasing the variation coefficient of k will increase the infiltration depth, while the safety factor of the slope decreases. The infiltration depth and safety factor of the slope are most affected by rainfall duration, but its sensitivity to the variability coefficient of k will be strengthened when the rainfall intensity exceeds the infiltration capacity. This conclusion can provide reference significance for the risk estimation of slope geological hazards, which are induced by the rainfall infiltration.

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Numerical Analysis of Unsaturated Soil Slopes under Rainfall Infiltration Based on the Modified Glasgow Coupled Model

Cited by 12 publications

References 21 publications

Experimental Assessments of Treating Effect on Retaining Walls for Loess Slopes under Long‐Term Rainfall

Experimental Assessments of Treating Effect on Retaining Walls for Loess Slopes under Long‐Term Rainfall

Analysis of Influencing Parameters of the Improved Model for Rainfall Infiltration in Unsaturated Tailings Soil

Rainfall Infiltration Process of a Rock Slope with Considering the Heterogeneity of Saturated Hydraulic Conductivity

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