Abstract
Based on the coupled SPH-DEM-FEM numerical method, this paper analyzes the dynamic interaction of solid debris flow particle-liquid debris flow slurry-retaining dam in order to explore the dynamic response of retaining dam under the impact of the solid-liquid two-phase debris flow and delves into the process of the debris flow impact on the dam, the impact force of debris flow, and the elastic-plastic time-history characteristics of the dam under different slopes of trapezoidal grooves. The calculation results show that the coupled SPH-DEM-FEM method can vividly simulate the impact behavior of the solid-liquid two-phase debris flow on the dam, reproduce the impact, climbing, and siltation in the process of the debris flow impact; the dynamic time-history curve of the retaining dam is consistent with the law of the literature, and the result of the debris flow impact force obtained is close to that of the empirical formula. Moreover, this paper studies the impact force distribution of the debris flow impact process. The results have a certain reference value for the study of the dynamic response of the retaining dam under the impact of the solid-liquid two-phase debris flow and the engineering design of the debris flow-retaining dam.
Highlights
As a very common natural disaster in mountainous areas, debris flow is a special flood with a large number of solid particles and liquid slurry produced by the provenance body under the action of rainstorm and earthquake [1]
The dynamic coupling of solid debris flow particles and liquid phase debris flow slurry and retaining dam should be considered in the design of debris flow-retaining dam
Since the topographic conditions of the site are complex and this paper aims to analyze the dynamic response of the retaining dam, the numerical model is simplified as follows: The bottom and side of the debris flow gully are simplified to a plane, and the average specific drop of the debris flow gully is set to 30%; the debris flow is composed of solid particles and slurry and is given the initial velocity at the same time as the large rock to impact the retaining dam
Summary
As a very common natural disaster in mountainous areas, debris flow is a special flood with a large number of solid particles and liquid slurry produced by the provenance body under the action of rainstorm and earthquake [1]. Wang [15] et al used the SPH method to simulate the dynamic behavior of debris flow liquid, but did not carry out fluid-solid coupling analysis. Liu et al [17, 18] used the SPH-FEM method and DEMFEM method to analyze the dynamic behavior of debris flow and retaining dam and the coupling effect of debris flow and flexible retaining net It reflects the applicability and accuracy of the SPH-DEM-FEM coupling numerical method to simulate solid-liquid two-phase debris flowretaining dam coupling analysis. The numerical analysis method is used to study the dynamic response of the retaining dam under the impact of the solid-liquid two-phase debris flow, which provides theoretical and technical support for the design of the debris flow prevention and control system
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