Evolution of the Transient Saturated Zone and Stability Analysis of Slopes under Rainfall Conditions

Qiu, Xiang; Li, Jinhong; Jiang, Huangbin; Ou, Jinping; Ma, Jing

doi:10.1007/s12205-022-0733-x

Cited by 14 publications

(4 citation statements)

References 32 publications

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“…Wang et al (2019) developed the analytical solution of the factor of safety (FoS) to accommodate the effects of groundwater on the stability of the dump slope and suggested that the reduction of FoS vs. groundwater level could be described by an inverse function. For a single rainfall event, previous studies have explored the mechanism of rainfall infiltration into unsaturated soils, which is usually described by Darcy's law as formulated in Richard's equation (Van Gaalen et al, 2013;Qiu et al, 2022). Moreover, the hydraulic properties of the soil in the unsaturated layer are usually described by the van Genuchten equation (Tian et al, 2019;.…”

Section: Fig1 High Dump Slope Of Open Pit Mine Influnced By Rainfall ...mentioning

confidence: 99%

Combined influence of rainfall and groundwater on the stability of an inner dump slope

2023

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Landslides are a commonly encountered natural disaster throughout the worldwide. Among the various contributing factors, water is one of the major factors to induce slope instability. This work investigates the landslide problem induced by the combined action of rainfall infiltration and groundwater. To explore the correlation characteristics between the stress and stability of the dump slope under the coupling action of groundwater and rainfall, a mechanical model of the dump slope under the coupling action of groundwater and rainfall was established and a theoretical solution of FoS was developed to accommodate the effects of the seepage action of water and the strength reduction of soil in the process of water migration. It was determined that the primary factor inducing slope instability can change with groundwater and rainfall conditions. There exists a critical wetting front and critical groundwater depth where the dominant factor affecting slope safety changes, and a method for calculating the critical depth for slope instability is proposed. As groundwater depth increases, the critical wetting front depth increases; correspondingly, the critical FoS decreases. As the depth of the wetting front extends, the critical groundwater depth rises and FoS decreases. Meanwhile, the theoretical solutions are validated in a case study for the Shengli #1 open-pit mine. The results of the study may provide directional guidance for the stability analysis of similar slopes.

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Section: Fig1 High Dump Slope Of Open Pit Mine Influnced By Rainfall ...mentioning

confidence: 99%

Combined influence of rainfall and groundwater on the stability of an inner dump slope

2023

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“…At present, there are many achievements in slope seepage and stability analysis under rainfall. Relevant literature shows that different rainfall patterns [18,22], amounts of rainfall [23], rainfall periods [20], prophase rainfall [24], soil materials [25,26], and different slopes [27] have a greater impact on the slope seepage field under rainfall.…”

Section: Introductionmentioning

confidence: 99%

“…Although the research method of dry-stack tailings ponds under rainfall is the same as that of general slopes, the emphasis of the two studies is obviously different. Comparatively, because general slopes always have smaller volumes, and their seepage fields are easily affected by short-term rainfall [17,18,22], researchers pay more attention to the response of the transient seepage field of the slope under short-term rainfall [25][26][27][28], whereas a dry-stack tailings pond always has a high dam slope and large volume, and, in addition, has a considerable storage capacity for the rainwater. Moreover, under multi-year periodic rainfall, the water content of tailings in the dry-stack tailings ponds will continue to rise, and the saturation line of its internal seepage field will also increase year by year [13].…”

Section: Introductionmentioning

confidence: 99%

The Relatively Stable Seepage Field: A New Concept to Determine Seepage Field in the Design of a Dry-Stack Tailings Pond

et al. 2022

Applied Sciences

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The determination of seepage field is the basis to design seepage drainage facilities and dam slopes in tailings pond. However, in the design of a dry-stack tailings pond with a long service life, previous research has been mostly limited to the influence of short-term rainfall, and a proper concept has not been formed to guide the calculation of the seepage field in the design of a dry-stack tailings pond under the cumulative effect of long-term periodic rainfall. The objective of this study is to propose a new concept to concisely determine the seepage field for the design of a dry-stack tailings pond under multi-year periodic rainfall. To this end, the calculation model of the seepage field of a dry-stack tailings pond under multiyear rainfall was established. The evolution process of the seepage field was studied by numerical simulation based on the calculation model and the final form of the seepage field evolution of a dry-stack tailings pond was found. Accordingly, a new concept, the relatively stable seepage field (RSSF) which can be used as the basis for seepage drainage facilities and the dam slope design of a dry-stack tailings pond, was proposed and named. Furthermore, the influencing factors of a relatively stable seepage field were studied by numerical simulation. The results show that: (1) the cumulative infiltration of long-term periodic rainfall is the main reason for the formation of the RSSF, and (2) under the condition of constant annual rainfall, the distribution of the RSSF has little to do with the selection of rainfall mode. Therefore, a new understanding has been formed from this article whereby the RSSF is an essential basis to be considered in the design of the dam slope and drainage system of a dry-stack tailings pond.

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“…Recently, an increasing number of scholars have made efforts in the field of slope stability evaluation when the slope is under rainfall and the associated failure mechanism, including modeling tests [8][9][10][11], numerical simulations [12,13] and field monitoring [14,15]. Raj and Sengupta [16] studied the railway embankment slope failure in Malda, India, during rainfall and found that the rainfall intensity and duration were the two critical factors influencing soil slope safety.…”

Section: Introductionmentioning

confidence: 99%

Post Evaluation of Slope Cutting on Loess Slopes under Long-Term Rainfall Based on a Model Test

Liu

Zhou

et al. 2022

Sustainability

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The failure of treated slopes around the world, especially in China, is occurring at a noteworthy rate, resulting in an urgent requirement for post evaluation of the treated slopes; however, there is no mature technique established for post evaluation. By using a real loess slope treated by slope cutting in Shaanxi Province as the prototype, indoor geotechnical tests and model tests were performed to reveal the rainwater infiltration characteristics and pressure-varying characteristics inside the slope, the results of which were used to conduct a post evaluation of the slope in situ. The results mainly showed that the effect of rainwater scouring on the slope surface weakened gradually into a steady state at the end of the first year. The rainwater upon the slope surface preferentially infiltrated the platforms with gradually reducing rates; however, the observed wetting front cannot be regarded as the border between the unsaturated and saturated loesses. The soil pressures inside the slope did not increase, but decreased during the early period of rainfall. The displacements of key points mainly occurred during the first two years and then steady periods were entered. The above results were utilized to conduct a post evaluation of the slope prototype, by which a post evaluation framework was constructed.

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Evolution of the Transient Saturated Zone and Stability Analysis of Slopes under Rainfall Conditions

Cited by 14 publications

References 32 publications

Combined influence of rainfall and groundwater on the stability of an inner dump slope

Combined influence of rainfall and groundwater on the stability of an inner dump slope

The Relatively Stable Seepage Field: A New Concept to Determine Seepage Field in the Design of a Dry-Stack Tailings Pond

Post Evaluation of Slope Cutting on Loess Slopes under Long-Term Rainfall Based on a Model Test

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