Dynamic Response Analysis of Retaining Dam under the Impact of Solid-Liquid Two-Phase Debris Flow Based on the Coupled SPH-DEM-FEM Method

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.

Dynamic Response Study of Impulsive Force of Debris Flow Evaluation and Flexible Retaining Structure Based on SPH‐DEM‐FEM Coupling

“…is is because when the slope of the channel is sharp, the gravitational potential energy of debris flow is relatively large, and once the debris flow takes shape, the kinetic energy and impulsive force produced by debris flow will be far greater than when the slope is small. Li et al [32] explore the impulsive force and dynamic performance of rigid retaining structure impacted by debris flow by adopting the SPH-DEM-FEM method. By comparing impulsive force and dynamic performance of flexible retaining structure impacted by solid-liquid two-phase debris flow discussed in this paper, the dynamic performance and impact characteristics of flexible retaining structure and rigid retaining structure are quite different.…”

“…e rugged topography in the ditch is sharp, the gullies can be found anywhere, and the slope of the main ditch formation area is 19 °∼47 °, which belong to a vast debris flow ditch. e detailed geological information of Nanjiaogou can be found in [32].…”

“…e specific parameters of the geometric model are displayed in Table 1. e parameters such as debris flow channel and DEM particle density, elastic modulus, and Poisson's ratio are shown in the literature [32], and the specific mechanical parameters of the flexible retaining net and support cable are shown in the literature [24,28,29].…”

“…e results showed that the coupling numerical method could well reproduce the impact-climbing-silting process of debris flow and the impact issue of flexible retaining structure. Li et al [32] used the SPH-DEM method to study the dynamic performance and impact force of debris flow on a rigid retaining structure. Although the coupling numerical analysis method provides the basis and 2…”

Study on Dynamic Response of Blocking Structure and Debris Flow Impulsive Force considering Material Source Erosion

“…Lee and Jeong [11], Lee et al [21], Jeong and Lee [25], and Lee et al [26] adopted the coupled Euler-Lagrange (CEL) method to compare the test results with the debris flow disasters that have occurred, verifying the applicability of the coupled numerical analysis method. Li et al [27], Liu et al [28], and Liu et al [29], respectively, adopted the coupled numerical methods SPH-DEM, SPH-FEM, and DEM-FEM to investigate the dynamic response of the debris flow process model and the retaining structure. The above numerical simulation results provided the theoretical basis for considering the fluid-particle debris flow mixture of the process model.…”