Impact of fluid turbulent shear stress on failure surface of reservoir bank landslide

Zhang, Xuan; Liang, Chen; Zhang, Faming; Lv, Chengteng; Zhou, Yi

doi:10.1007/s12517-018-4030-4

Cited by 5 publications

(8 citation statements)

References 47 publications

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“…where f r is rolling friction coefficient, which taken as 0.10 according to the gravel distribution characteristics exposed by the sliding surface, and N is the weight above the rolling surface (kN). So, the calculation formula of the stability coefficient of the limit equilibrium method can be expressed as formula (3).…”

Section: Improved Limit Equilibrium Methodmentioning

confidence: 99%

“…where α is the dip angle of the slide surface, w is the weight of the slice (kN), c is cohesion of the sliding surface (kPa), L is the length of the slice (m), P is the water pressure in relaxation crack (kN), τ r is the rolling friction force (kN), and τ u is the button shear stress (kN); the calculation method can refer to the literature [3]. u is the pore-water pressure coefficient, determined according to the rising degree of groundwater level.…”

Section: Improved Limit Equilibrium Methodmentioning

confidence: 99%

“…Landslides often happened in cold and arid relaxation rock slope area due to excavation or natural climate conditions, especially in the construction of water conservancy and hydropower projects. In the past, most scholars have been devoted to the study of relaxation rock engineering characteristics or relaxation mechanism [1][2][3][4], but detailed studies of relaxation rock mass slope failure mechanisms in cold and arid area are sparse, especially considering the hydrodynamic force. In the construction of water conservancy and hydropower station in Western China, the stability of relaxation rock slope was often encountered at dam foundation or bank slope of the reservoir area.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influences of Hydrodynamic Force on Deep Relaxation Rockslide in Cold and Arid Areas of Langjia Reservoir in China

Zhang

Zhu

et al. 2022

Lithosphere

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This research took the Langjia landslide in Qinghai Province of China as an example to explore the failure mechanism and mode of deep relaxation rockslide at cold and arid areas of the plateau under the influence of temperature difference, rainfall. Studies showed that deep relaxation tension cracks are the main precondition of the occurrence of the landslide, and the main triggering factor was the strong weathering and disintegration of argillaceous cemented conglomerate on sliding surface. Affected by rainfall, snow melting, and temperature, the water trapped in tensile cracks froze to ice in winter to accelerate the development of cracks and melt into water in spring and summer to accelerate the weathering process. The process led to forming a sliding surface of mud rock with gravel by weathering the argillaceous cemented conglomerate along the cracks, which was confirmed by field investigation after occurrence of the landslide. For this special failure type, calculation formula on considering rolling friction, sliding friction, and bottom shear stress was proposed, and the influence of shear stress on sliding surface on landslide stability under the seepage caused by rainfall and summer melt water when landslide occurred was discussed. The calculation results of three-dimensional numerical simulation and improved Sarma’s method on considering the hydrodynamic action on relaxation slope stability are consistent with the actual situation.

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Section: Improved Limit Equilibrium Methodmentioning

confidence: 99%

Section: Improved Limit Equilibrium Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influences of Hydrodynamic Force on Deep Relaxation Rockslide in Cold and Arid Areas of Langjia Reservoir in China

Zhang

Zhu

et al. 2022

Lithosphere

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“…The effect of waves on bank collapse is mainly reflected in the impact of periodic wave loads and erosion on the bank slope. Wave loading on the bank slope is related to the wave type, wave height, wave length, wave period, and bottom shear stress [17][18][19]. Although significant progress has been made on bank collapse in plain-type reservoirs, very few investigations have examined the mechanism of bank collapse in river-type reservoirs in mountainous areas.…”

Section: Introductionmentioning

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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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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“…The Three Gorges Reservoir area (TGRA) is significantly affected by catastrophic landslides, and the colluvial landslides often occur in this area due to reservoir water level changes [11]. Since June 2003 when the Three Gorges Pro-ject was completed, around 2619 landslides have failed due to the fluctuation of the reservoir water level, and 670 mountains are under unstable status [5][6][7][12][13][14][15][16][17][18][19][20]. Therefore, it is important to study the failure mechanism to provide guideline for the risk assessment of the landslides.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of Colluvial Landslide Influenced by the Water Level Change in the Three Gorges Reservoir Area

et al. 2021

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The stability of the reservoir bank landslide is affected by a variety of external factors, and the fluctuation of reservoir water level is one of the important influencing factors. The Erdaohe landslide is a typically colluvial landslide in the Three Gorges Reservoir area with periodic reservoir water level fluctuations. According to landslide displacement data, the displacement of the Erdaohe landslide exhibits the significantly stepwise feature. Its failure mechanism was analyzed using strength reduction method by the FLAC3D package in the case of reservoir water level changes. The results indicate that the hydrodynamic pressure has an important impact on the initialization of the landslide failure. When reservoir water level rises rapidly or maintains constant at the lower level, the landslide stability would be higher. When the reservoir water level decreases rapidly or maintains constant at the higher level, the landslide stability will be smaller. When the reservoir water level was in the lowest elevation, the factor of safety (FS) reached the minimum value of 1.11. Findings in this paper can provide guidelines for the risk assessment of colluvial landslides.

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Impact of fluid turbulent shear stress on failure surface of reservoir bank landslide

Cited by 5 publications

References 47 publications

Influences of Hydrodynamic Force on Deep Relaxation Rockslide in Cold and Arid Areas of Langjia Reservoir in China

Influences of Hydrodynamic Force on Deep Relaxation Rockslide in Cold and Arid Areas of Langjia Reservoir in China

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

Failure Mechanism of Colluvial Landslide Influenced by the Water Level Change in the Three Gorges Reservoir Area

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