Quantitative back analysis of in situ tests on guiding flexible barriers for rockfall protection based on 4D energy dissipation

Luo, Liru; Yu, Zhixiang; Jin, Yuntao; Zhang, Lijun; Guo, Liping; X, Qi; Zhao, Shichun

doi:10.1007/s10346-022-01845-3

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…The top cables were broken, and the flexible mesh fails under the impulse impact load, as shown in Fig 27(B) . Comparing the time interval curves of the cables, as shown in Fig 24 , the design of the flexible barrier impacted by the dilute flow needs to adopt the design method of the flexible barrier impacted by a rockfall [ 29 ].…”

Section: Influences Of the Dilute Flow Regime On The Interaction Betw...mentioning

confidence: 99%

Effects of flow regimes on the interaction between granular flow and flexible barrier

Xiao,

Xu,

Wang

et al. 2023

PLoS ONE

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Flexible barriers are widely used to mitigate granular flows. In practice, flow regimes may keep changing along a flow path after the initiation of granular flows. The effects of flow regimes should be considered in the design of flexible barriers to intercept granular flow. In this study, flow regimes are divided into three types: dilute flow; dense flow; and quasistatic flow. The impact mechanisms of dense granular flows and dilute granular flows against flexible barriers are investigated using flume tests and the discrete element method. Influences of the ratio of the average particle size to the mesh size of a flexible barrier and particle segregation on the interaction between the flexible barrier and the granular flow are revealed. Differences of the impact mechanisms between rockfall and granular flow are compared. Results show that the impact force of dense granular flow against a flexible barrier will not increase linearly with the average particle size. The tensile force of the bottom cable is usually the maximum tensile force among all cables of the flexible barrier. Particle segregation will lead to increase in impact force of dense flows and tensile force of the upper cables. Impact force of the dilute granular flow increases with the average particle size. Different from the failure of a flexible barrier under the impact of the dense flow, the middle and upper cables are easier to break. Based on these findings, a useful reference for the future design of flexible barriers was proposed.

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Section: Influences Of the Dilute Flow Regime On The Interaction Betw...mentioning

confidence: 99%

Effects of flow regimes on the interaction between granular flow and flexible barrier

Xiao,

Xu,

Wang

et al. 2023

PLoS ONE

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show abstract

“…Flexible protection systems have been widely employed in transportation, land, mineral, and energy sectors, among others, to prevent and control geological disasters on slopes. The flexible barrier, one of the structural variations of the flexible protection system (Volkwein et al, 2011;Gentilini et al, 2012;Shi et al, 2013;Luo et al, 2022), is particularly well known for its effectiveness as a defence against highenergy impact hazards such as rockfalls, debris flows, mudslides, and avalanches (Peila and Ronco, 2009;Rorem et al, 2013;Kwan et al, 2014). The flexible barrier is a structural system made up of the supporting part, the intercepting part, the connecting part, the energy dissipation part, and the anchoring part.…”

Section: Introductionmentioning

confidence: 99%

Optimization strategy for flexible barrier structures: investigation and back analysis of a rockfall disaster case in southwestern China

Luo,

Yu,

Zhang

et al. 2024

Nat. Hazards Earth Syst. Sci.

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Abstract. Field investigations and back analyses were conducted on a rockfall hazard. The flexible barrier protection system constructed along the roadside was damaged by the rockfall impact and lost its mitigation ability. Vital physical characteristics such as rockfall trajectory and kinetic energy were presumed based on the data from the aerial survey and the slope digital model. A numerical model, including slope, rockfalls, and flexible barrier, was created and thus the impacting process was reproduced. It demonstrates that the impact kinetic energy of the rockfall is only around 40 % of its design protection energy. The improper connections of members are the leading causes of damage, which prevent the flexible barrier from producing significant deformation and reduce its capacity to absorb impact force. The damage can be avoided by changing the connections of the members to improve the ability of the nets and ropes to slide and deform. The calculation results indicate that the impact resistance of the optimized model is 3 times better than the actual project. The findings can be used as a guide when designing a flexible protection system that performs better.

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New energy criterion for rock slope excavation-induced failure based on catastrophe theory: methodology and applications

Zhou,

Chen

2024

Bull Eng Geol Environ

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Quantitative back analysis of in situ tests on guiding flexible barriers for rockfall protection based on 4D energy dissipation

Cited by 5 publications

References 25 publications

Effects of flow regimes on the interaction between granular flow and flexible barrier

Effects of flow regimes on the interaction between granular flow and flexible barrier

Optimization strategy for flexible barrier structures: investigation and back analysis of a rockfall disaster case in southwestern China

New energy criterion for rock slope excavation-induced failure based on catastrophe theory: methodology and applications

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