Influence of textural properties on the failure mode and process of landslide dams

Zhu, Xinghua; Peng, Jianbing; Liu, Bangxiao; Cheng, Jin; Guo, Junbo

doi:10.1016/j.enggeo.2020.105613

Cited by 40 publications

(23 citation statements)

References 32 publications

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“…The shaded region is the cumulative grain size distribution of 42 landslide dams in the Northern Apennines (Casagli et al, 2003) and the data points marked as crosses are data from the experimental tests of Yan and Cao, 2009;Cao et al, 2011;Xu et al, 2013;Shi et al, 2014;Yang et al, 2015;Zhou et al, 2015;Jiang et al, 2017;Jiang et al, 2018a;Jiang et al, 2018b;Xiong et al, 2018;Jiang and Wei, 2020;Zhu et al, 2020. The solid line represents the grain-size distribution of the modeled landslide dams.…”

Section: Figure 3 |mentioning

confidence: 99%

“…This is why predictions of outburst flood discharge in the downstream area by statistical analysis significantly deviate (at times in orders of hundreds) from measured data (Zhou M.J. et al, 2019). In order to supplement our knowledge on the mechanisms of landslide dam breaching and its outburst flooding, well-controlled experiments of landslide dam breaching are conducted to understand the effects of the dam geometry (e.g., Davies et al, 2007;Cao et al, 2011;Chen et al, 2012;Walder et al, 2015;Yang et al, 2015;Jiang and Wei, 2020;Zhu et al, 2020), soil material characteristics (e.g., Cao et al, 2011;Jiang et al, 2018b;Xiong et al, 2018;Zhu et al, 2020), initial moisture content (e.g., Chen S.C. et al, 2015; and river channel slopes (e.g., Zhu et al, 2020). Recently, external boundary effects such as seismic perturbations (e.g., Shi et al, 2014), surging (e.g., Peng et al, 2019) and cascading failures (e.g., Zhou et al, 2013;Shi et al, 2015;Zhou et al, 2015), etc.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Outburst Discharge of Landslide Dam Overtopping Failure

et al. 2021

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Research on the factors and mechanisms that influence outburst floods are essential for estimating outflow hydrographs and the resulting inundation. In this study, large flume tests are conducted to investigate the effects of the upstream inflow and the presence of loose erodible deposits on the breaching flow and the subsequent outburst floods. Experimental results reveal that hydrographs of the breaching flow and outburst flood can be divided into three stages where each stage is separated by inflection points and peak discharges. It is found that the larger the inflow discharge, the larger the peak discharge of the outburst flood and the shorter the time needed to reach the peak and inflection discharges of the outburst flood. The breaching flow decreases along the longitudinal direction at rates that increase with the inflow discharge. The ratio between the length of the upstream dam shoulder and the dam width is inversely related to the ratio of the outburst discharge to inflow discharge. We also show that the presence of loose deposits at the dam toe can amplify the peak discharge of outburst flood by increasing the solids content of the water flow.

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Section: Figure 3 |mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Outburst Discharge of Landslide Dam Overtopping Failure

et al. 2021

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“…In this research, the specific particle size of coarse and fine need to be distinguished. Hence, we take 1 mm as the critical value to distinguish coarse and fine particles [6,23]. By changing the clay particle content, we can explore its influence on the initiation of mine waste debris flows.…”

Section: The Characteristics Of the Mine Wastementioning

confidence: 99%

“…This increase in pore water pressure is commonly associated with the rise of the water table perched on the bedrock or on top of relatively impermeable soils [19][20][21]. In this case, landslide materials contain a fine fraction to retain water in the unsaturated zone and limit the saturated conductivity, which inhibits drainage from the source area [22,23]. Therefore, three basic requirements have to be fulfilled simultaneously for geotechnical debris flows to occur: the presence of steep slopes, the availability of unconsolidated material, and an unusually high supply of water [1,24].…”

Section: Introductionmentioning

confidence: 99%

A Qualitative Study of the Critical Conditions for the Initiation of Mine Waste Debris Flows

Cao

Zhu

Liu

et al. 2020

Water

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Mine waste debris flows are a type of man-made debris flow that commonly lead to major disasters. In this study, the Xiaotong Gully, which is located in the Xiaoqinling gold mining area in China and contains a typical mine waste debris flow gully, was selected as the study area. Since a debris flow can be classified as either a geotechnical debris flow or hydraulic debris flow based on its initiation mode, we conducted 46 experimental model tests to explore the initiation conditions of these two different types of debris flows. According to our tests, the initiation conditions of hydraulic debris flows were mainly affected by the flume gradient, the water content of the mine waste, the inflow discharge, the water supply modes, and the clay particle content. A larger flume gradient and higher mine waste water content were more conducive to initiating a hydraulic debris flow. However, the influence of the water supply mode on the initiation of a hydraulic debris flow was complex (influenced by factors such as water content of mine waste, runoff discharge rate and rainfall intensity). The critical runoff of a hydraulic debris flow, which starts with a parabolic relationship to the clay particle content of the mine waste, decreased with increasing clay particle content and then increased. There was a minimum critical runoff when the clay content of the mine waste was 30%. The initiation conditions of a geotechnical debris flow were mainly affected by the flume gradient, the water content, and the clay particle content. The critical gradient of a geotechnical debris flow decreased with increasing water content and had a parabolic relationship to the clay particle content. In tests 31–46 of this study, the second and third critical slopes both decreased and then increased with increasing clay particle content. These preliminary research results provide a scientific reference for subsequent research on the prevention and mitigation of mine waste debris flows.

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“…The difficulty, therefore, further increases in debris flows studies. Debris flows are common in the western mountainous areas of China and often cause great damage to people's life and property safety (Hu et al 2020;Zhu et al 2020). Monitoring and early warning technologies are gradually attracting the attention of hazard prevention and mitigation workers all over the world in the face of major geological hazards (Ouyang et al 2019;Yan et al 2019a, b).…”

Section: Introductionmentioning

confidence: 99%

A multiobjective evolutionary optimization method based critical rainfall thresholds for debris flows initiation

et al. 2020

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Influence of textural properties on the failure mode and process of landslide dams

Cited by 40 publications

References 32 publications

Experimental Investigation of the Outburst Discharge of Landslide Dam Overtopping Failure

Experimental Investigation of the Outburst Discharge of Landslide Dam Overtopping Failure

A Qualitative Study of the Critical Conditions for the Initiation of Mine Waste Debris Flows

A multiobjective evolutionary optimization method based critical rainfall thresholds for debris flows initiation

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