Effect of seepage on shallow landslides in consideration of changes in topography: Case study including an experimental sandy slope with artificial rainfall

Kim, Min Seok; Onda, Yuichi; Uchida, Tatsuo; Kim, Jin Kwan; Song, Young Suk

doi:10.1016/j.catena.2017.10.004

Cited by 64 publications

(21 citation statements)

References 45 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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“…During intensive heavy rainstorms, landslides in soils and weathered rock mostly occur on steep slopes, and are generally characterized by rapid motions and fluid-like flows. Investigations have shown that the risk of landslides on the island is low where slopes are gentle and high where they are steep [62][63][64]. Landslides are prone to occur in steep topography, which may lead to severe landslide damages [55,65].…”

Section: Relationship Between Topography and Landslidesmentioning

confidence: 99%

Assessment of Geohazards and Preventative Countermeasures Using AHP Incorporated with GIS in Lanzhou, China

2018

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This research investigates geohazards and preventative countermeasures for Lanzhou City, China. To investigate the factors related to the development of geohazards in Lanzhou, the regional geological conditions around Lanzhou were investigated. The geomorphology of the region is comprised of a loess landform underlying quaternary loess deposits. A large number of faults induced by strong neotectonic movements are present in the area. Therefore, earthquakes frequently occur around Lanzhou. Earthquakes cause numerous rock falls and landslides, with landslide masses found scattered on the upper middle level of the area's mountains. When intense rainfall occurs, a lot of loose deposits are brought together along steep gullies, forming debris flows; hence, a disaster chain of earthquake-landslide-debris flow is formed. To evaluate the georisks around Lanzhou, the Analytic Hierarchy Process (AHP) was employed to assess geohazards. The spatial distribution of the evaluated georisk levels was mapped using a Geographic Information System (GIS). Based on the assessed results, about 55% of the urban area and 44% of Gaolan County have high or very high-risk levels. The ratio of relatively high disaster risk levels is up to 31% of the total area. To mitigate these geohazards, both strategic decision making and technical countermeasures should be implemented.

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“…2) The CDH landslide: Seepage and deformation occurred in the CDH simultaneously under the influence of back-end confluence; their interaction (fluid-solid coupling) can be simulated using the finite-difference software (Kim et al 2018;Singh et al 2008;Zhou et al 2019). 3) Debris flow: Calculation of velocity and discharge of debris flow based on cross-section investigation; this method is widely used for preliminary evaluation of debris flow and engineering treatment (Chen et al 2015).…”

Section: Introductionmentioning

confidence: 99%

New insights into the delayed initiation of a debris flow in southwest China

Peng

Chen

Gui-sheng

et al. 2021

Preprint

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On 6 July 2020, 3 h 40 min after rainfall stopped, a delayed debris-flow disaster occurred due to colluvium deposits in a hollow region (CDH) in the Chenghuangmiao gully, Sichuan Province, China, which resulted in 4 deaths and 27 injuries. This study explores the initiation process of the delayed debris flow and the cause for the delay. Field investigations, catchment geometry interpretation, laboratory tests, theoretical calculations, and fluid-solid coupling numerical simulation were performed to obtain landslide parameters and understand the mechanisms of the event. Results show: (1) The event was a giant low-frequency viscous debris flow. (2) Its initiation was caused by the delayed landslide process under the influence of back-end confluence. (3) The debris-flow discharge in the main gully increased over 19.5 min. (4) The seepage process inside the CDH continued for 3 h 20 min after the rainfall stopped before its pore pressure and reduction in strength was sufficient to initiate the debris flow. This research provides new insights on delayed debris-flow disasters; it is a reference for improving disaster management systems, especially monitoring and early warning systems, thereby avoiding future casualties.

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Effect of seepage on shallow landslides in consideration of changes in topography: Case study including an experimental sandy slope with artificial rainfall

Cited by 64 publications

References 45 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

Assessment of Geohazards and Preventative Countermeasures Using AHP Incorporated with GIS in Lanzhou, China

New insights into the delayed initiation of a debris flow in southwest China

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