Numerical and analytical investigation towards performance enhancement of a newly developed rockfall protective cable-net structure

Dhakal, Shanker; Bhandary, Netra Prakash; Yatabe, Ryuichi; Kinoshita, Naoki

doi:10.5194/nhess-12-1135-2012

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…Moreover, to prevent rocks falling from both ends of the shed, interception structures, such as fences [39], should also be installed at both ends of the structure. Otherwise, to protect the nearby buildings and facilities from the impact of falling rocks that are rebounded out by the buffer structure, passive rockfall barrier systems [21-23, 29, 30] or hybrid protection systems [40] can be installed to intercept the falling rock on the ground or guide them to a place where it is convenient for cleaning, achieving a comprehensive protection goal.…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…The simulation data were compared with the tensile strength tests carried out on the mesh, calibrating model parameters from a macro-perspective. A three-tier modeling of a rockfall protective mesh structure which improved the constitution of the attenuating system components and explored the improvement of the performance of the structure was proposed by Dhakal et al (2012). New algorithms based on Abaqus and general contact, a numerical approach for parameter, were proposed to model the mesh (Escallón and Wendeler 2013;Escallón et al 2014Escallón et al , 2015, which better described the complex physical processes and mechanical properties under the action of rockfall.…”

Section: Numerical Analysis Researchmentioning

confidence: 99%

A review of flexible protection in rockfall protection

Yang

Duan

et al. 2019

Nat Hazards

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Natural hazards, such as high winds, heavy rains and ice melting, can easily trigger the rockfall which usually leads to great personal injuries and property loss; therefore, the rockfall protection is of great significance and necessity. Among the types of protection, the flexible protection occupies a beneficial condition of application. This paper indicates the basics of flexible protection which includes its classification and advantages, subsequently, analyzing the mechanism of both active protection and passive protection, and then systematically summarizing the research accomplishments, and puts forward the research direction of the flexible protection, including: (1) apart from the traditional rigid protection, the flexible protection has a wide range of advantages, which makes the flexible protection a new and effective protective structure in the rockfall protection; (2) the current researches reveal that though the scholars have done a variety of achievements of flexible protection, there is still a lack of precise simulation of the whole model and local test of the component; (3) putting forward the prospective research direction minutely in both active protection and passive protection.

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“…In literature, in order to simplify the numerical analyses, the ring net was modeled with truss elements [20] or with shell elements [44,50]. However, the available numerical models fail in simulating the behavior of the rings at large deformation stage due to a lack of experimental validation.…”

Section: Modelling Of the Wire-ring Netmentioning

confidence: 99%

An energy allocation based design approach for flexible rockfall protection barriers

Gentilini

et al. 2018

Engineering Structures

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This paper proposes an effective design approach for quickly determining the specification, size and amount of components of a flexible rockfall protection barrier structure. The approach is based on a reliable numerical modelling validated by several experimental tests that include both component tests and full-scale impact tests. The interception structure made up of a steel wire-ring net is accurately investigated through a series of inplane and out-of-plane quasi-static tests carried out on net specimens, to define the ring constitutive model and failure criterion. The accuracy of the numerical strategy for an overall barrier structure with nominal energy level of 1500 kJ is validated by a full-scale in-situ test including service energy level (SEL) and maximum energy level (MEL) impacts, according to the European guidelines. From the numerical models, it is inferred that the total energy of the impact is simultaneously dissipated in different ways, where the internal energy of the structure plays a significant role. The distribution of the absorbed energy among the different barrier components is explored and defined by means of the developed finite element model. Besides, the design values of the internal force in the ropes are derived with an adequate safety margin. The proposed design procedure, applied to a barrier structure with nominal energy level of 3500 kJ, is assessed by a full-scale impact test, proving that the design approach is reliable and efficient.

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Numerical and analytical investigation towards performance enhancement of a newly developed rockfall protective cable-net structure

Cited by 11 publications

References 12 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

A review of flexible protection in rockfall protection

An energy allocation based design approach for flexible rockfall protection barriers

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