Energy Dissipating Devices in Falling Rock Protection Barriers

Castanon-Jano, Laura; Blanco-Fernández, Elena; Castro‐Fresno, Daniel; Ballester-Muñoz, Francisco

doi:10.1007/s00603-016-1130-x

Cited by 41 publications

(28 citation statements)

References 27 publications

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“…The energy dissipating devices attached to steel ropes can consume 60-80% of total impact energy on the system [6,7]. The research [25] shows that no matter frictional, yielding and hybrid energy dissipating devices, the restoring force characteristics of them are similar, as shown in Figure 8b. The effect of energy dissipating device on the impact deformation of the system is directly related to the mechanical behavior of the connected rope.…”

Section: Deflection Of Energy Dissipating Devicementioning

confidence: 96%

A Simple Analytical Method for Evaluation of Flexible Rockfall Barrier Part 1: Working Mechanism and Analytical Solution

2018

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The flexible rockfall barrier system exhibits large deflection and complex contact behaviors such that sophisticated finite element method and full-scale test are widely used to design this kind of structures, which causes inconvenient for most engineers. In this paper, a simple analytical method is proposed for fast evaluation of the performance of the flexible rockfall barrier system on the basis of system deflection characteristics observed in the full-scale impact tests and, the component deflection characteristics from component tests such as the puncturing deflection of steel wire-ring net, elongation of energy dissipating device, sliding movement of supporting rope and rotation of support structure. The equation for prediction of large deflection of flexible rockfall barrier system was established. The overall deflection is contributed by its components and therefore the analytical solutions for calculation of component deflections were derived based on the space geometry analysis and verified by component tests. The analytical solution for steel wire-ring nets were validated by 17 puncturing tests and the maximum difference was less than 7.4%. Using the discrete ring net model, an explicit dynamic method was employed to simulate the nonlinear behaviors of flexible rockfall barriers with different design energies, i.e. 2000 kJ, 3500 kJ and 5000 kJ. The deflection of each component and the overall deflections from analytical solutions were compared with the numerical simulations with the maximum difference less than 7.9%. Thus, the proposed analysis solution for evaluation of large deflection of flexible rockfall barrier system is valid and ready for engineering design. A companion paper is presented in part two separately with full-scale test for further verification of the proposed method.

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Section: Deflection Of Energy Dissipating Devicementioning

confidence: 96%

A Simple Analytical Method for Evaluation of Flexible Rockfall Barrier Part 1: Working Mechanism and Analytical Solution

2018

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“…The interception structure is made by the principal net that has to bear the dynamic impact of the falling rock block through its plastic deformation and transferring the load to the foundations. A large variety of technologies for the principal net, posts, fixing, and connecting components can be found in practice, and different energy dissipating devices have been developed [105].…”

Section: Risk Management and Conservation Assessment Of Protection Dementioning

confidence: 99%

Evaluating Rockfall Risk: Some Critical Aspects

et al. 2020

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Rockfalls evolve rapidly and unpredictably in mountain environments and can cause considerable losses to human societies, structures, economical activities, and also natural and historical heritage. Rockfall risk analyses are complex and multi-scale processes involving several disciplines and techniques. This complexity is due to the main features of rockfall phenomena, which are extremely variable over space and time. Today, a considerable number of methods exists for protecting land, as well as assessing and managing the risk level. These methodologies are often very different from each other, depending on the data required, the purposes of the analysis, and the reference scale adopted, i.e., the analysis level of detail. Nevertheless, several questions still remain open with reference to each phase of the hazard and risk process. This paper is devoted to a general overview of existing risk estimation methodologies and a critical analysis of some open questions with the aim of highlighting possible further research topics. A typical risk assessment framework is exemplified by analyzing a real case study. Each step of the process is treated at both the detailed and the large scale in order to highlight the main characteristics of each level of detail.

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“…Díaz et al [4] investigated the energy-consuming characteristics of spring-type energy dissipator. Castanon-Jano et al [5] summarized the composition and energy dissipating principle of the different energy dissipators used in the rockfall interception system and evaluated the energy dissipating capacity. Muhunthan et al [6] researched the bolt forms of flexible rockfall protection barriers.…”

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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Energy Dissipating Devices in Falling Rock Protection Barriers

Cited by 41 publications

References 27 publications

A Simple Analytical Method for Evaluation of Flexible Rockfall Barrier Part 1: Working Mechanism and Analytical Solution

A Simple Analytical Method for Evaluation of Flexible Rockfall Barrier Part 1: Working Mechanism and Analytical Solution

Evaluating Rockfall Risk: Some Critical Aspects

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

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