An energy allocation based design approach for flexible rockfall protection barriers

Hu, Xu; Gentilini, Cristina; Yu, Zhixiang; X, Qi; Zhao, Shichun

doi:10.1016/j.engstruct.2018.07.018

Cited by 48 publications

(28 citation statements)

References 32 publications

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“…LS-DYNA commercial software was used to further study the impact-resilient characteristic of the buffer structure. For the numerical model of the main components, except for the spring rod, please refer to papers about flexible rockfall barrier by Zhao et al [33]; Xu et al [34]; Qi et al [35]; and Yu et al [23,36]. Furthermore, some important information about the model is detailed below.…”

Section: Numerical Modelmentioning

confidence: 99%

Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Zhao

Guo

et al. 2019

Shock and Vibration

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Rock sheds have been widely used to protect against rockfall. Traditionally, a cushion layer is placed on the top of a rock shed to reduce the impact force and dissipate energy. However, heavy cushion layers lead to high dead loads and increased construction costs. This paper discusses the concept of an impact-resilient flexible buffer structure. On the basis of that concept, it also proposes a buffer structure mainly composed of springs, ring nets, spring rods, and support ropes, which can be used to replace the traditional cushion layer on a shed for rockfall protection. Full-scale impact tests were conducted to study the impact-resilient characteristic of the structure combined with numerical simulation. The dynamic responses of the buffer structure, including force, deformation, and energy dissipation, were analysed in depth. Finally, parametric numerical simulations of 33 models were conducted; the spring stiffness of these models ranged from 300 kN/m to 1500 kN/m; the impact energy ranged from 100 kJ to 2000 kJ. Moreover, simple approaches for estimating the impact force and braking distance of the buffer structure were proposed and verified using measured data obtained from the impact test.

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Section: Numerical Modelmentioning

confidence: 99%

Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Zhao

Guo

et al. 2019

Shock and Vibration

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“…8c). Flexible barriers have become one of the most common measures, but their usage is limited by rockfall kinetic energy (< 8,000 kJ) and trajectory height (< 8 m) (Lambert and Bourrier, 2013;Crosta et al, 2015;Xu et al, 2018;Volkwein et al, 2019). 1 m during the impacts to road (Fig.…”

Section: Rockfall Countermeasure Design and Optimizationmentioning

confidence: 99%

Key issues in 3D rockfall modeling, natural hazard and risk assessment for rockfall protection in Hrensko (Czechia)

Kusák¹,

Valagussa²,

Frattini³

2019

Acta Geodynamica Et Geomaterialia

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The growing urban development in mountain areas together with climate change increased the need for rockfall research and modeling. Determining rockfall processes and related hazard is still a difficult task because of the complexity and intrinsic stochastic nature of the physics involved. In recent years, numerical simulations of rockfall trajectories became common procedure for evaluating rockfall hazard. Increasing of model accuracy leads to the need for more specific complex calibration, appropriate combination of rockfall modeling tools, as well as careful assessment of rockfall sources, block and slope characteristics. Rockfall modeling issues have been tested in local study areas in Hřensko (Czechia) through HY-STONE 3D software. The Hřensko area is characterised by sandstone landscape with rock plateaus, deep canyons with several levels of steep cliffs, which forms favourable conditions for rockfalls. Different modeling approaches, calibration problems, dependency of model results to parameters, and proposed appropriate countermeasures are discussed. The aim of this paper is to provide a knowledge base for researchers and practitioners involved in projects dealing with rockfall protection.

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“…Yu et al [12,13] proposed a simple analytical method for fast evaluation of the performance of the flexible rockfall barrier system and established the equation for prediction of large deformation of flexible rockfall barrier system. Xu et al [14] proposed an energy allocation based design approach for quickly determining the specification, size and amount of components of a flexible rockfall protection barrier structure, which based on a reliable numerical modelling validated by several experimental tests that include both component tests and full-scale impact tests.…”

Section: Figure 1 Composition Of a Flexible Rockfall Protection Barriermentioning

confidence: 99%

A New Numerical Modelling Approach for Flexible Rockfall Protection Barriers Based on Failure Modes

2018

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To study the mechanical behaviour of the flexible rockfall protection barriers under impact load, four full-scale impact tests involving protection capacities of 750 kJ and 2000 kJ were conducted, including two successful and two failed tests. The experimental results show that the system has three working stages. Among these three stages, the second and the third stages play significant roles in both absorbing the impact energy and ensuring the system performance reasonable. Based on the observed failure modes in the tests, the key factors leading to the breakdown of the system are investigated. A new numerical modelling approach is established, which is able not only to predict the capacity of the flexible protection barrier subjected to the rockfall impact but also to accurately simulate the main failure modes such as buckling of the steel post and breakage of the rope. The experimental results are employed to assess and verify the calculation model, and the numerical responses of the system are in good agreement with the test data. Furthermore, a flexible rockfall protection barrier with a capacity of 5000 kJ is designed by using the numerical procedure as an effective tool, shown by a full-scale impact test.

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An energy allocation based design approach for flexible rockfall protection barriers

Cited by 48 publications

References 32 publications

Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Key issues in 3D rockfall modeling, natural hazard and risk assessment for rockfall protection in Hrensko (Czechia)

A New Numerical Modelling Approach for Flexible Rockfall Protection Barriers Based on Failure Modes

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