Effect of structural setting of source volume on rock avalanche mobility and deposit morphology

Duan, Zhao; Wu, Yan-Bin; Zhang, Qing; Li, Zhenyan; Ye, Lin; Wang, Kai; Liu, Yang

doi:10.5194/se-13-1631-2022

Cited by 6 publications

(2 citation statements)

References 69 publications

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“…There is no side constrains to the boundary conditions of this study. At 60°, the sliding mass can perform more discernable kinematic parameters from our previous studies (Duan et al, 2021;Duan et al, 2022a;Duan et al, 2022b;Li et al, 2021a), which is the reason for the choice of such a slope angle. In our preexperiments, the erodible layer can not be penetrated completely at 24mm thickness, and the deposit boundary is clearer at 3.6×10 − 3 m 3 .…”

Section: Limitations Of Laboratory Testingmentioning

confidence: 90%

Deposit morphology and structure under interactions of sliding mass and erodible layers: experimental insights

Yao,

Zhang,

Duan

et al. 2023

Environ Earth Sci

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Landslides are a kind of highly concerned geological disasters that occurring with complex motion processes and mechanisms. They often signi cantly affect the human life and properties located in their pathway. In some circumstances, the geological phenomena and structural features generated by the interactions between landslides and their substrates are still unclear, which makes it di cult to be forecasted and mitigated on its effects. In this study, a sandbox experiment was conducted to study the velocity and displacement of the sliding mass, the geometry of the deposit, and the internal and external structural characteristics of the deposit under the interactions between the sliding mass and erodible layer by varying the depth of the erodible layer. Results show that the motion process of sliding mass consists of three stages: falling, shovel push-extrusion, and push-nappe accumulation. In the rst stage, the velocity of the sliding mass increases sharply to a peak velocity before colliding with the erodible layer. In the latter two stages, the mobility of landslide is greatly limited by the erodible layers at the foot of the inclined plate, and the secondary acceleration of the sliding mass is observed. The deposits were divided into three zones (I a , I b , and II), in terms of the morphological and structural characteristics of their positions. The action forms were mainly pushing and covering in the zone II and I respectively. There were phenomena such as strata inversion, pushover, and entrainment that occurred in the deposits; the folds, ridges, and bulge that occurred on the surface of deposits. These structural characteristics re ect the stress states of laboratory landslides in motion from compressing to shearing. The results of this research will provide a valuable theoretical reference for the calculation of the disaster range when erodible layers exist in landslides' motion paths.

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Section: Limitations Of Laboratory Testingmentioning

confidence: 90%

Deposit morphology and structure under interactions of sliding mass and erodible layers: experimental insights

Yao,

Zhang,

Duan

et al. 2023

Environ Earth Sci

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“…The received NIR data are transformed into 3D cloud data of the surface morphology. The 3D data are produced according to the principles of stereoscopic parallax and active triangular ranging 13 , 14 , 36 . Two high-speed cameras (60 frames/s, 0.4-megapixel resolution) are used to collect images at the end of each experiment.…”

Section: Methodsmentioning

confidence: 99%

Influence of slope angle on deposit morphology and propagation of laboratory landslides

Duan

Peng

et al. 2023

Sci Rep

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Landslide deposits often exhibit surface features, such as transverse ridges and X-shaped conjugate troughs, whose physical formation origins are not well understood. To study the deposit morphology, laboratory studies typically focus on the simplest landslide geometry: an inclined plane accelerating the sliding mass immediately followed by its deceleration on a horizontal plane. However, existing experiments have been conducted only for a limited range of the slope angle θ. Here, we study the effect of θ on the kinematics and deposit morphology of laboratory landslides along a low-friction base, measured using an advanced 3D scanner. At low θ (30°–35°), we find transverse ridges formed by overthrusting on the landslide deposits. At moderate θ (40°–55°), conjugate troughs form. A Mohr–Coulomb failure model predicts the angle enclosed by the X-shaped troughs as 90° − φ, with φ the internal friction angle, in agreement with our experiments and a natural landslide. This supports the speculation that conjugate troughs form due to failure associated with a triaxial shear stress. At high θ (60°–85°), a double-upheaval morphology forms because the rear of the sliding mass impacts the front during the transition from the slope to the horizontal plane. The overall surface area of the landslides increases during their downslope motion and then decreases during their runout.

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Implications of sand grains’ mobility and inundating area to landslides at different slope angles

Wu,

Duan,

Peng

et al. 2024

Granular Matter

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Effect of structural setting of source volume on rock avalanche mobility and deposit morphology

Cited by 6 publications

References 69 publications

Deposit morphology and structure under interactions of sliding mass and erodible layers: experimental insights

Deposit morphology and structure under interactions of sliding mass and erodible layers: experimental insights

Influence of slope angle on deposit morphology and propagation of laboratory landslides

Implications of sand grains’ mobility and inundating area to landslides at different slope angles

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