Geomorphology and Sedimentology of the Nyixoi Chongco Rock Avalanche and Implications for Emplacement Mechanisms

Journal of Geophysical Research Earth Surface, Journal Year: 2025, Volume and Issue: 130(3)

Published: March 1, 2025

Abstract Large rock avalanches are ubiquitous surface hazards on Earth and characterized by long runout distances high velocities. These extreme mobility features regarded as the key causes of catastrophic damage. Commonly, these a complicated set geological settings behaviors. Although many hypotheses have been proposed to explain this phenomenon, comprehensive explanation its is lacking. To precisely identify mechanisms large avalanches, we examined data collected from deposit Nyixoi Chongco avalanche (NCRA) (Tibetan Plateau, China). Through combination preliminary observations analyses morphology sedimentology deposits, reconstructed kinematic process recognized that formation superficial structures related mass flow emplacement dynamics driven high‐speed debris impacting liquefiable substrate. One mechanism NCRA reduction in basal layer resistance owing contraction‐induced excess pore pressure. further validate quantify mechanism, numerical simulations were conducted using multiphase model determine how deformable granular mixtures led pressure underwent liquefaction when was emplaced, demonstrating dominated behavior avalanche. The present study provides an improved method understanding processes similar avalanches.

Language: Английский

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A two-phase coupled FEM-MPM framework for large deformation analysis of slopes considering multiple influencing factors

Engineering Analysis with Boundary Elements, Journal Year: 2025, Volume and Issue: 176, P. 106242 - 106242

Published: April 2, 2025

Language: Английский

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Experimental and MPM modelling of widened levee failure under the combined effect of heavy rainfall and high riverine water levels

Computers and Geotechnics, Journal Year: 2025, Volume and Issue: 184, P. 107259 - 107259

Published: April 11, 2025

Language: Английский

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Layered construction process with the material point method

Computers and Geotechnics, Journal Year: 2024, Volume and Issue: 171, P. 106401 - 106401

Published: May 12, 2024

This paper presents a novel procedure to simulate layered construction processes with the material point method (MPM), suitable for modelling large deformations. For first time, provides MPM capability of behaviour earth structures from their until eventual post-failure in an integrated manner without requiring, as currently done, use other numerical tools simulation. In addition, proposed methodology includes option simulating engineering practice compensating settlements that occurred during construction, match designed geometry. option, typically neglected alternative methods, is implemented by filling computational elements layers become empty adding new points. The process and its implementation into open-source code are described detail. validation carried out elastic oedometric column varying number comparing it analytical solutions finite element-based results. soil embankment dry, saturated, partially saturated conditions also simulated. It shows capture excess pore water pressures may develop.

Language: Английский

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Probabilistic Analysis of Post-Failure Behavior in Landslides and Kinetic Energy-Based Risk Assessment

Published: Jan. 1, 2024

Language: Английский

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