Experimental study of reservoir bank collapse in gravel soil under different slope gradients and water levels

Zhao, Jianjun; Hanyue, Zhang; Yang, Changxin; Lee, Min Lee; Zhao, Xu; Lai, Qiyi

doi:10.1007/s11069-020-03922-z

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…Some researchers have analysed the erosion effect of waves on bank slopes by considering the wavecurrent interactions, but few have studied the mechanism of bank collapse from the perspective of wave impact damage. Only a few experimental studies on cohesive lateral bank erosion [35,36] and mountainous river-type reservoirs have been reported in the literature [37,38]. This is not 10 Lithosphere quantitatively sufficient to fully understand the mechanism of bank collapse in areas.…”

Section: Discussionmentioning

confidence: 99%

“…In view of the coarse-grained soil bank slope being widely distributed in plain reservoirs, owing to the material and structural conditions of the bank slope, the time of bank collapse is short [45,46]. Some researchers divide bank collapse into three stages [36,38]. For river-type reservoirs, the softening of rock and soil and the wave impact makes the bank collapse take a longer time, and the bank collapse process can be described in six steps.…”

Section: Collapse Evolution In the Mountainousmentioning

confidence: 99%

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Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China

2022

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Slopes facing reservoir water often collapse, affecting reservoir capacity. It is important to understand the factors affecting such collapses and predict the locations of collapse after impoundment for practical purposes. However, the mechanism of bank collapse in mountainous areas after reservoir impoundment remains unclear. To address this issue, field geotechnical property surveys, laboratory tests, and numerical simulations were employed to evaluate bank collapse susceptibility. The results showed that (i) bank collapse mainly occurs in slopes with a small cohesion and internal friction angle of less than 30°; (ii) the main effects of wave action on bank collapse are scour, erosion, and cyclic impact on the bank slope: wave erosion occurs in the bank slope with a wave height of less than 1.0 m, cohesion of less than 90 kPa, and slope angle of less than 30°, and wave impaction mainly occurs at the area with a wave height of more than 2.0 m and a slope angle of more than 30°; (iii) for valley reservoirs, softening of water on the slope rock and soil mainly reduces cohesion, which commonly occurs within 30 days; the cyclic action of wave impact load mainly damages the structure and reduces the internal friction angle. The influence of waves on bank collapse is mainly related to the wave height and wave velocity. The antiwave impact broken energy of rock and soil is an important index to evaluate whether bank collapse occurs in the long term, which is related to the strength, structure, and impact resistance. The present research is helpful to better understand the mechanism and evolution process of reservoir bank collapse.

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Section: Discussionmentioning

confidence: 99%

Section: Collapse Evolution In the Mountainousmentioning

confidence: 99%

Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China

2022

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“…Some conditions along the river further accentuate the effect of Japanese knotweed on erosion. A riverbank invaded with knotweed and with a steep slope will be more eroded because steeper banks allow faster water flow than flatter banks (Krzeminska, Kerkhof, Skaalsveen, & Stolte, 2019; Laubel, Kronvang, Hald, & Jensen, 2003; Zhao et al, 2020). Islets in invaded rivers are particularly susceptible to erosion because they are completely submerged during flooding.…”

Section: Discussionmentioning

confidence: 99%

Japanese knotweed increases soil erosion on riverbanks

Matte

Boivin

Lavoie

2021

River Research & Apps

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For years, Japanese knotweed (Reynoutria japonica) has been suspected of accelerating riverbank erosion, despite a lack of convincing evidence. The stems of this invasive plant die back following the first autumn frosts, leaving the soil unprotected during winter and spring floods. In Québec (Canada), riverbank erosion may also be accentuated by ice during mechanical ice breakups. The objective of this study was to evaluate the influence of knotweed on riverbank erosion along a river invaded by the species, within a context of floods with ice. The elevation along 120 cross‐sectional riverbank profiles, occupied or not by knotweed, was measured before and after the spring flood of 2019. On average, riverbanks occupied by knotweed had nearly 3 cm more soil erosion than riverbanks without knotweed, a statistically significant difference. Stem density also influenced erosion: the higher the density, the greater the soil loss. Certain riverside conditions, such as the slope of the riverbank or being located on an islet, interacted with knotweed, further accentuating erosion. Soil losses measured between November 2018 and May–June 2019 were particularly pronounced, but the spring flood was also exceptional, with a recurrence interval close to 50 years. On the other hand, soil loss from rivers invaded by knotweed can be expected to increase over time, as this invasive species spreads rapidly in riparian habitats.

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“…Sudden deformation in granular material due to wetting is called collapse deformation. This usually occurs in recent soil deposits with a high void ratio 1 and reservoir banks after impoundment 2 . In addition, soils in the foundation of structures or in the body of embankments may experience high volumetric deformation if they are poorly compacted.…”

Section: Introductionmentioning

confidence: 99%

The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting

Mahinroosta

Oshtaghi

2021

Sci Rep

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This paper investigates the effect of particle shape on the stress reduction and collapse deformation of gravelly soil using a medium-scale direct shear test apparatus under different relative densities, normal stress, and shear stress levels. A new method based on the Micro-Deval test was introduced to produce sub-angular particles from angular particles. Therefore, two series of soil specimens were obtained with the same rock origin, particle size distribution, and relative density but different particle shapes. In addition to traditional direct shear tests on dry and wet specimens, a specific test procedure was applied to explore the stress reduction and collapse of soil specimens due to wetting. The results of the tests, including shear stress–shear displacement and vertical displacement-shear displacement, were compared. The results showed that the stress reduction and settlement due to wetting increased with vertical and shear stress levels in both types of particle shapes, with higher values in angular particle shapes. The particle breakage of the soil specimens was also studied quantitatively using the change in the particle size distribution before and after the test. It was shown that the wetting of the samples had more impact on the particle breakage in angular gravel than sub-angular gravel, which increased linearly with the normal stress.

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Experimental study of reservoir bank collapse in gravel soil under different slope gradients and water levels

Cited by 10 publications

References 12 publications

Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China

Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China

Japanese knotweed increases soil erosion on riverbanks

The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting

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