Numerical Modelling of a Low-Energy Rockfall Barrier: New Insight into the Bullet Effect

Mentani, Alessio; Giacomini, A.; Buzzi, Olivier; Govoni, Laura; Gottardi, Guido; Fityus, Stephen

doi:10.1007/s00603-015-0803-1

Cited by 38 publications

(27 citation statements)

References 24 publications

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“…In particular, certain impact locations have the potential to harm a barrier more than the tested standard load cases or even cause the failure of a barrier. Further, if small blocks with high impact velocities are expected, the mesh might suffer from puncturing loads, as studied by [24][25][26]. One would hope, therefore, that market competition not only favors the least expensive systems, but also helps resolve quality issues.…”

Section: Evaluation and Known Issuesmentioning

confidence: 99%

Review of Approval of Flexible Rockfall Protection Systems According to ETAG 027

et al. 2019

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In 2009, the European Guideline for Flexible Rockfall Protection Kits European Technical Approval Guideline 027 (ETAG 027) became valid. The aim of the guideline was to approve and certify steel barriers available on the market according to a common standard. In 2018, ETAG 027 was replaced by a so-called European Assessment Document (EAD). This contribution summarizes results and experiences that were obtained through the type testing, approval and assessment procedures of 66 protection systems evaluated between 2009 and 2018. Apart from the common main task of the barriers to stop falling blocks successfully, the different test conditions and constructions of barriers result in different performance characteristics. Some of these characteristics follow certain trends, whereas others show a wide range without any trend. In such a case, this contribution helps to classify a single system compared to the others.

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Section: Evaluation and Known Issuesmentioning

confidence: 99%

Review of Approval of Flexible Rockfall Protection Systems According to ETAG 027

et al. 2019

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“…The mechanical response of the barrier elements was described based on available results of laboratory tests in de Miranda et al (2015). Particular attention was devoted to model the behaviour of the wires within the hexagonal mesh, following data of experiments carried out on mesh portions (Mentani et al, 2015;Thoeni et al, 2013). A representative scheme of the stress-strain curve for each structural element is given in Fig.…”

Section: Fe Modelmentioning

confidence: 99%

“…This may be undertaken making use of suitable numerical tool, among the various ones that have been developed over the last 20 years, with increasing complexity with either finite or discrete element models (FEM or DEM resp.) (Nicot et al, 2001;Volkwein, A., 2005;Gottardi and Govoni, 2010;de Miranda et al, 2010;Bertrand et al, 2012;Gentilini et al, 2012Gentilini et al, , 2013Escallòn et al, 2014;de Miranda et al, 2015;Bourrier et al, 2015;Mentani et al, 2015; curate. Nevertheless, a relatively high computational cost limits their use in view of investigating the response of barriers varying many parameters, either concerning the structure or the impact conditions.…”

Section: Introductionmentioning

confidence: 99%

Introducing Meta-models for a More Efficient Hazard Mitigation Strategy with Rockfall Protection Barriers

et al. 2018

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The paper presents a new approach to assess the effecctiveness of rockfall protection barriers, accounting for the wide variety of impact conditions observed on natural sites. This approach makes use of meta-models, considering a widely used rockfall barrier type and was developed from on FE simulation results. Six input parameters relevant to the block impact conditions have been considered. Two meta-models were developed concerning the barrier capability either of stopping the block or in reducing its kinetic energy. The outcome of the parameters range on the meta-model accuracy have been also investigated. The results of the study reveal that the meta-models effective in reproducing with accuracy the response of the barrier to any impact conditions, providing a formidable tool to support the design of these structures. Furthermore, allowing to accomodate the effects of the impact conditions on the prediction of the block-barrier interaction, the approach can be successfully used in combination with rockfall trajectory simulation tools to improve rockfall quantitative hazard assessment and optimise rockfall mitigation strategies.

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“…In addition, the construction/reconstruction cost of concrete barrier is high [1]. For the rockfall fence, even though construction cost is comparatively low, the capability of protection is low and perforation of net may occur, the so-called bullet effect [2,3,4]. In this study, a simple and new method was introduced to mitigate the rockfall hazard using the so-called sand pool.…”

Section: Introductionmentioning

confidence: 99%

Mitigation Method of Rockfall Hazard on Rock Slope Using Large‐Scale Field Tests and Numerical Simulations

Yoon

Ban

Hwang

et al. 2020

Advances in Civil Engineering

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This paper presents the mitigation of rockfall hazard on the large-scale rock slope using the field tests with numerical simulation. To this end, field tests including the pendulum test and real rock falling tests were performed to investigate the rock movements such as rotation, repulsion, and speed. In the simulation, the validation of the developed model followed by calibration processes was made on the field tests. In this study, a simple and new method was proposed to mitigate the rockfall hazard using the so-called sand pool made by ditching and then filling sand where the rock should be stopped or arrested. The results showed that the sand pool method was very effective and economical.

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Numerical Modelling of a Low-Energy Rockfall Barrier: New Insight into the Bullet Effect

Cited by 38 publications

References 24 publications

Review of Approval of Flexible Rockfall Protection Systems According to ETAG 027

Review of Approval of Flexible Rockfall Protection Systems According to ETAG 027

Introducing Meta-models for a More Efficient Hazard Mitigation Strategy with Rockfall Protection Barriers

Mitigation Method of Rockfall Hazard on Rock Slope Using Large‐Scale Field Tests and Numerical Simulations

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