A coupled SPH-DEM-FEM model for fluid-particle-structure interaction and a case study of Wenjia gully debris flow impact estimation

This study aimed to quantitatively identify the influence of the block impact angle and block shape on the impact effect of reinforced concrete RC sheds. The smooth particle hydrodynamic (SPH) method and finite element method (FEM) were coupled and used to solve the simulation difficulty of large deformation of the sand buffer layer. The accuracy of the coupled model was verified by the full-scale test data. Finally, the impact forces and the dynamic responses of the RC shed were analysed, focusing on the effects of the block impact angle and shape. The numerical results show that the coupled SPH-FEM method is effective for simulating how block impacts the RC shed. The block impact angle and shape can signiﬁcantly influence the normal and tangential impact forces. The design of the RC shed based on the assumption of blocks as free-falling spherical projectiles can lead to inaccuracy in some impact scenarios.

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“…In this way, the domain variables can be introduced in a continuous form, as seen in Eq. (4) (Liu et al 2021):…”

Section: A Brief Description Of Sphmentioning

confidence: 99%

Dynamic response of reinforced concrete sheds against the impact of rock block with different shapes and angles

2022

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“…The steel column, main girder, secondary beam, and steel roof slab adopted shell elements with the complete integration of three/four nodes, and the mesh size is 0.05 m. The EPS and impactor adopted solid elements with the complete integration of six nodes, and the mesh sizes are 0.06 m and 0.04 m, respectively. Due to the direct impact of the impactor, the sand cushion will experience a large deformation, which can easily cause mesh distortion and lead to the instability of the calculation [20,27]. Therefore, SPH simulation is adopted for sand, and the spacing between the adjacent SPH particles is about 0.05 m. three/four nodes, and the mesh size is 0.05 m. The EPS and impactor adopted soli ments with the complete integration of six nodes, and the mesh sizes are 0.06 m an m, respectively.…”

Section: Numerical Model Descriptionmentioning

confidence: 99%

“…Therefore, SPH simulation is adopted for sand, and the spacing between the adjacent SPH particles is about 0.05 m. three/four nodes, and the mesh size is 0.05 m. The EPS and impactor adopted soli ments with the complete integration of six nodes, and the mesh sizes are 0.06 m an m, respectively. Due to the direct impact of the impactor, the sand cushion will expe a large deformation, which can easily cause mesh distortion and lead to the instabi the calculation [20,27]. Therefore, SPH simulation is adopted for sand, and the sp between the adjacent SPH particles is about 0.05 m.…”

Section: Numerical Model Descriptionmentioning

confidence: 99%

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Buffer Capacity of Steel Shed with Two Layer Absorbing System against the Impact of Rockfall Based on Coupled SPH-FEM Method

Liu¹,

Liu²

2022

Sustainability

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This study aimed to find the optimal thickness combination of the two-layered absorbing system combinated with an expanded polystyrene (EPS) cushion and a soil layer in a steel shed under dynamic loadings. The coupled Smooth Particle Hydrodynamic method (SPH) and Finite Element Method (FEM) were introduced to simulate the impact of the rockfall against the steel shed with a two-layer absorbing system. By comparing the numerical results with test data, the coupled numerical model was well validated. Through the verified numerical model, a series of numerical experiments were carried out to find the optimal combination for the two-layered absorbing system. The values of the EPS layer thickness as a percentage of the total thickness were set as 0% (P1), 20% (P2), 40% (P3), 60% (P4), 80% (P5), and 100% (P6). The results show that the coupled FEM–SPH method was an effective method to simulate rockfall impacting the steel rock shed; P4 (0.6 m thickness EPS cushion and 0.9 m thickness soil layer) was the most efficient combination, which can significantly reduce the structural displacement response by 43%. A two-layered absorbing system can effectively absorb about 90% of the total energy. The obtained results yield scientifically sound guidelines for further research on the design of steel sheds against rockfall.

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“…13d). It is generally accepted that the impact load of a debris flow is a comprehensive outcome from many characteristic parameters, including the debris flow density, velocity, impact contact area and approaching angle (Liu et al, 2021). It is assumed that the debris flow density is constant in the computational process of impact forces in the FLOW-3D model.…”

Section: Effect Of the Surrounding Buildings' Azimuthal Anglesmentioning

confidence: 99%

Sensitivity analysis of a built environment exposed to debris flow impacts with 3-D numerical simulations

Huang

Zhang²,

Xiang³

2022

Preprint

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Abstract. The characteristics of exposed built environments have a significant effect on debris flow impacts on buildings, but knowledge about their interactions is still limited. This paper presents a sensitivity analysis on the overall peak impact forces on a building resulting from the built environment parameters, including the orientation, opening scale of the target building, and azimuthal angle and distance of surrounding buildings. The impact forces were obtained using the FLOW-3D model, a computational fluid dynamics approach, verified through the physical modeling results. The results show that the surrounding buildings’ properties have significant roles in determining the peak impact forces. A shielding effect or canalization effect, which reduce or increase impact forces, respectively, can be produced by changing the azimuth angle. A deflection wall for building protection is recommended according to the shielding effect. A narrowed flow path, determined by both the azimuth angle and distance, has a significant effect on the variation in impact forces. In addition, it is concluded that a splitting wedge should be designed following a criterion of avoiding the highest flow velocity – the smallest approaching angle – appearing near the longest wall element. The protruding parts caused by changing the building’s orientation contribute to increasing impact loads within a shielding area. A limited opening effect is observed on the whole building if there is sufficient time for material intrusion. The insights gained contribute to a better understanding of building vulnerability indicators and local migration design against debris flow hazard.

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A coupled SPH-DEM-FEM model for fluid-particle-structure interaction and a case study of Wenjia gully debris flow impact estimation

Cited by 49 publications

References 37 publications

Dynamic response of reinforced concrete sheds against the impact of rock block with different shapes and angles

Dynamic response of reinforced concrete sheds against the impact of rock block with different shapes and angles

Buffer Capacity of Steel Shed with Two Layer Absorbing System against the Impact of Rockfall Based on Coupled SPH-FEM Method

Sensitivity analysis of a built environment exposed to debris flow impacts with 3-D numerical simulations

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