Abstract
Abstract The erosion of debris flows on the material source will affect the movement and impact of the debris flow. This paper adopted the coupled SPH-DEM-FEM to establish a complex dynamic model of the particle-fluid-erosion-structure of the debris flow and to assess the impact of erosion and sedimentation and analyse the dynamic response of the retaining structure of the debris flow. The strain-softening model was adopted to simulate the transformation of the debris flow body from the solid state to the transition state and finally into the liquid state. The coupled numerical analysis completely reproduces the debris flow erosion test, fitting the debris flow shape and thickness profile well. The impact process of the debris flow, the impact height behind the retaining dam, the deposition thickness, and the debris flow dynamic response significantly influence both with and without considering the effects of erosion. The results of this study are similar to existing literature and data, with the numerical analysis being consistent with the physical simulation tests in the existing literature, verifying the applicability of the SPH-DEM-FEM coupling analysis for assessing the debris flow impact retaining structures of erosion and sedimentation. The study also found that the dynamic response considering the debris flow impact and the retaining structures of erosion and sedimentation is more pronounced than when not considering erosion and sedimentation. Coupled numerical analysis can assess the potential effect of erosion and sedimentation, making a significant contribution to the assessment of the impact of debris flow and the design of retaining structures.
Highlights
Debris flows contain heavy sediment fluid and solid particles and are one of the most destructive and unpredictable geological disasters, threatening people’s lives and property [1]
This paper studied the influence of erosion on solid-liquid debris flow mixture impacts and the impact of the debris flow and the dynamic response of the retaining structure using the coupled SPH-DEM-FEM method, combined with the strain softening model
The numerical simulation results are consistent with the results and laws of the existing literature and provide a new method for the calculation of the impact of the debris flow erosion model under the complex interaction of the particle-fluid-erosion-structure and can be used to guide the design of the retaining structure
Summary
Debris flows contain heavy sediment fluid and solid particles and are one of the most destructive and unpredictable geological disasters, threatening people’s lives and property [1]. High-speed moving solid-liquid debris flow mixtures with a large mass cause significant erosion and sedimentation on its flow path. This can significantly influence the kinetic energy and impact of the debris flow, impacting the structures on its flow path [2]. Erosion and deposition of the debris flow mixture composed of particles and fluids will produce great kinetic energy that will impact the flow path. Erosion, which is produced by fluidization, is one of the factors that can influence debris flows
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