Consideration of maximum impact force design for a rock shed against dry granular flow

Liu, Chun; Yu, Zhixiang; Zhao, Shichun

doi:10.1080/19648189.2020.1779135

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…(2) where λ is the rigid barrier shape coefficient, which has a Fluid kinetic energy approach recommended value of 1.33, ρ is the flow density (kg/m 3 ), v (Liu et al 2020) is the impact velocity (m/s), θ is the incidence angle (°), and g is the gravity acceleration, 9.8 m/s 2 . Hydrodynamic approach recommended value of 2.5.…”

Section:   =mentioning

confidence: 99%

“…Impact tests have shown that the flow velocity, flow volume, and impact time can directly influence the maximum impact force (Jiang et al 2018). Liu et al (2020) investigated the interactions of the bulk volume, impact velocity and slope angle and obtained a formula for evaluating the maximum impact force. Ng et al (2021) proposed a new equation for optimizing the design impact load for debris flows.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of maximum impact force exerted by dry granular flows on a rigid barrier

Yuan,

Wen,

Pei

2023

Preprint

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Rigid barriers are protective structures widely used in mountainous regions to resist the destructive impacts of dry granular flows originating from shallow landslides or collapses. The determination of the maximum impact force exerted by dry granular flows is crucial in designing rigid barriers. In this study, we conducted laboratory tests in which we examined the weight and particle shape of dry granular flows, as well as the drop height, incident angle, and thickness of the rigid barrier, to investigate the impact force on the rigid barrier. The results indicated that the strongest impact was concentrated at the centre of the rigid barrier, particularly in the lower centre area of the barrier. A new approach is proposed to estimate the maximum impact force on rigid barriers exerted by dry granular flows. In addition, a new impact equation for calculating the maximum impact force that explicitly considers the effects of rigid barrier structural properties on the impact dynamics based on the modulus, Poisson's ratio, and thickness and the particle shape effects based on different shape coefficients is proposed. Based on this new approach, agreement between the prediction results and the observation results was obtained.

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Section:   =mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of maximum impact force exerted by dry granular flows on a rigid barrier

Yuan,

Wen,

Pei

2023

Preprint

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“…Compared to the impact of rolling and falling rocks, granular flows have more complex mechanical properties, and they can cause damage to shed tunnels even without reaching the ultimate bearing capacity. The dynamic effects of granular flow impact on shed tunnels and the cushioning effects of the cushion layer have been investigated through methods such as model experiments, numerical simulations, and theoretical analysis [26][27][28][29][30][31]. Indeed, although there have been significant advancements in research on the dynamic impact of granular flow, there are still many unresolved challenges regarding the underlying mechanical mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Granular Flow Impact on Shed Tunnels and the Buffering Effect of Cushion Layers

Wei,

Wang,

Dai

2024

Applied Sciences

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Granular flow is one of the most destructive geological hazards in mountainous areas, posing a severe threat to the economy and personnel safety in the region. Shed tunnels are widely used for the prevention and mitigation of granular flow hazards. Thus, comprehensively studying the impact mechanisms of granular flows on shed tunnels is significant for disaster prevention and mitigation. This study adopts a combined approach of a physical model experiment and Particle Flow Code (PFC) simulation to investigate the impact force of granular flow on shed tunnels and the buffering effect of cushion layers. The influences of slope angle, cushion layer thickness, and cushion layer particle size are discussed. It is revealed that as the slope angle increases, the velocity of the granular flow and the impact force on the shed rise significantly. When the slope angle increases from 40° to 60°, the peak velocity surges by 25%, while the impact force intensifies by 2–3 times. Moreover, increasing the thickness of the cushion layer can mitigate the interaction between the granular flow and the shed tunnel, thereby enhancing structural safety. With an increase in cushion layer thickness from 0 to 200 mm, the impact force is reduced by approximately 50%. Meanwhile, reducing the particle size of the cushion layer effectively decreases the impact force, resulting in less kinetic energy and providing a stronger cushioning effect.

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“…However, it is still difficult to quantitatively determine the effect of the block shape and impact angle on the dynamic response of RC sheds. Above all, the current research shows that the block shape and impact angle is significantly important (Chen et al 2015;Liu et al 2019Liu et al , 2020, and its complicated factors should be investigated more systematically based on a robust numerical model.…”

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confidence: 99%

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

2022

Self Cite

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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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Consideration of maximum impact force design for a rock shed against dry granular flow

Cited by 10 publications

References 21 publications

Experimental investigation of maximum impact force exerted by dry granular flows on a rigid barrier

Experimental investigation of maximum impact force exerted by dry granular flows on a rigid barrier

Granular Flow Impact on Shed Tunnels and the Buffering Effect of Cushion Layers

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

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