An Empirical Power Density‐Based Friction Law and Its Implications for Coherent Landslide Mobility

Deng, Yu; Yan, Shuaixing; Scaringi, Gianvito; Liu, Wei; He, Siming

doi:10.1029/2020gl087581

Cited by 25 publications

(12 citation statements)

References 62 publications

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“…In Figure 4, in the initial frictional weakening stage, a decrease in friction coefficient occurred, from a peak value of 0.69 consistent with Byerlee's range 0.6-0.85) to a steady-state coefficient of 0.17 (Byerlee, 1968;Deng et al, 2020). This frictional weakening behavior has been observed in various rocks and gouges, and it mainly depends on the normal stress and slip velocity (Chen et al, 2017;Del Gaudio et al, 2009;Hirose & Shimamoto, 2005;Hu, Yin, et al, 2018;Mizoguchi et al, 2007;Tsutsumi & Shimamoto, 1997) or on the power density, that is, the product of normal stress and velocity (Deng et al, 2020;Di Toro et al, 2011).…”

Section: Initial Weakening Stagesupporting

confidence: 56%

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Mineralogical Analysis of Selective Melting in Partially Coherent Rockslides: Bridging Solid and Molten Friction

Deng

Scaringi

et al. 2020

JGR Solid Earth

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Frictional shearing along the basal slip surface is the main energy dissipation mechanism in coherent landslides, which undergo little internal deformation during runout. Most landslide bodies, however, deform and break down more or less extensively; thus, only a portion of their potential energy is dissipated through basal shearing. The mineral components of rocks and soils have individual melting temperatures. Therefore, as temperature increases, selective melting will occur in a defined sequence. The product of such melting is termed frictionite. Here, we exploited a sliding block model to investigate the role of selective melting in the evolution of the frictional resistance (and hence mobility) of partially coherent landslides. We recognized three frictional stages, characterized by weakening, strengthening, and melt lubrication. As melting proceeds, a gradual transition from solid friction to viscous flow occurs, which can be modeled in terms of the molten mineral fraction. The chemical composition also evolves and so does its viscosity. Rocks with different mineral proportions (e.g., mafic vs. felsic rocks) will exhibit different frictional evolutions. Our model results are consistent with the recognized role of landslide thickness in defining its mobility. Moreover, the frictional strengthening stage is shown to become irrelevant under high confinement, thereby facilitating higher mobility, or sometimes shifting slip surface if weak layer exists. We also discussed the relevance of some strengthening‐upon‐melting behavior observed at the experimental scale, pointing out the role of the energy conversion coefficient, which is a proxy for landslide coherence.

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Section: Initial Weakening Stagesupporting

confidence: 56%

“…The energy conversion coefficient e will be discussed in section 3.4. Although there is a scaling law between high rotary experimental data and natural landslides (Deng et al, 2020), it may have little effect on the whole scope of the simulation in the light of the preliminary nature of the model.…”

Section: Initial Weakening Stagementioning

confidence: 99%

Mineralogical Analysis of Selective Melting in Partially Coherent Rockslides: Bridging Solid and Molten Friction

Deng

Scaringi

et al. 2020

JGR Solid Earth

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“…In all lines, the landslide type that is formed is a translational type caused by water entering the lower layer so that landslides occur. Incoherent landslides, the shape, and structure of the soil are unstable or the rock mass remains intact during the landslide [10] . Overall, landslides in the Gombel Hill area can be found at a depth of 5 m -6 m and are found at the contact between the clay and clay rock layers [11] .…”

Section: Resultsmentioning

confidence: 99%

Landslide Zone Investigation by Determining Cracks and Cracks Compressive Strength Test in Waru District, Pamekasan Regency

Ariyanto

Joni

2021

Indonesian J Appl Phys

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Landslide zone investigation has been conducted using geoelectricity to determine the number of cracks and using a compressive strength test to determine compressive strength cracks. The result of this research is that the rock layers of Waru District consist of soil layers resulting from the weathering of quartz rock into quartz sandstone. This quartz sandstone lies on top of a more solid rock layer. The type of landslide that is formed in the Waru sub-district is translational. This type of landslide is caused by water entering the lower layer, causing landslides and the number of cracks that trigger landslides. The results of the low compressive strength test resulted in landslides. This result was due to a decrease in the number of pores filled with water and an increase in the pores that were not filled with water. This occurs due to the presence of water in the cracks, the number of cracks cavities, and the density of the cracks which results in reduced adhesion between the cracks holding layers.

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“…e friction heat change has a certain positive correlation with the velocity of elements in the scraping area. Related references show that the high temperature generated by frictional heat will weaken the friction effect and cause the elements' velocity to increase rapidly [52][53][54][55].…”

Section: Discussionmentioning

confidence: 99%

Dynamic Analysis of the High‐Speed and Long‐Runout Landslide Movement Process Based on the Discrete Element Method: A Case Study of the Shuicheng Landslide in Guizhou, China

Xia

Liu

et al. 2021

Advances in Civil Engineering

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On July 23, 2019, a high-speed and long-runout landslide occurred in Jichang Town, Shuicheng County, Guizhou Province, China, causing 42 deaths and 9 missing. This paper used the discrete element software MatDEM to construct a three-dimensional discrete element model based on digital elevation data and then simulated and analyzed the movement and accumulation process of the landslide. The maximum average velocity of the source area elements reached 14 m/s when passed through the scraping area; meanwhile, the velocity of the scraping area elements increased rapidly. At 90 s, the maximum displacement of the source area elements reached 1358.5 m. The heat generated during the movement of the landslide was mainly the frictional heat, and the frictional heat increased sharply when the source area elements passed through the scraping area. The change of frictional heat has a certain positive correlation with the velocity of the scraping area elements. Finally, the volume of the scraping area elements was 2.4 times greater than the source area elements in the deposits. The scraping effect increases the volume of the sliding body and expands the impact area of the landslide disaster. Additionally, by setting different compressive and tensile strengths as well as internal friction coefficients to analyze the influences of their value changes on the landslide movement process, the results show that the smaller the strengths and internal friction coefficient of the model, the greater the depth and area of the scraping area, which will result in a thicker accumulation; meanwhile, the average displacement, average velocity, and heat will also increase.

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An Empirical Power Density‐Based Friction Law and Its Implications for Coherent Landslide Mobility

Cited by 25 publications

References 62 publications

Mineralogical Analysis of Selective Melting in Partially Coherent Rockslides: Bridging Solid and Molten Friction

Mineralogical Analysis of Selective Melting in Partially Coherent Rockslides: Bridging Solid and Molten Friction

Landslide Zone Investigation by Determining Cracks and Cracks Compressive Strength Test in Waru District, Pamekasan Regency

Dynamic Analysis of the High‐Speed and Long‐Runout Landslide Movement Process Based on the Discrete Element Method: A Case Study of the Shuicheng Landslide in Guizhou, China

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