Centrifuge modeling of railway embankments in terms of high moisture content of soil

Vinogradov, V. V.; Zaitsev, Y.K. Frolovsky A.A.

doi:10.1201/b10554-207

Cited by 5 publications

(4 citation statements)

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“…In recent years, the researches on study of buffering performance of flexible rockfall barrier system mainly adopted full-scale impact tests and numerical simulations [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Peila D et al [5] conducted the full-scale impact tests of the flexible rockfall barrier system with various energy levels.…”

Section: Stageⅱmentioning

confidence: 99%

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: Stageⅱmentioning

confidence: 99%

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

2018

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“…Over a decade or so, numerical modelling has also proved its importance either to aid or replace the full-scale tests, which normally incurs a large budget and mechanically less detailed and, therefore, sometimes limited to fully disclose the behaviour of the structure. The concept, approach and application of simple, analytical modelling are rare, except for a few recent contributions such as Schellenberg (2007), Cantarelli et al (2008) and Miranda et al (2010). As the first attempt, in the present work, the authors have preferred to propose the simplest possible analytical model that may equivalently simulate the global response, primarily the displacement response.…”

Section: Numerical Analysismentioning

confidence: 99%

Experimental, numerical and analytical modelling of a newly developed rockfall protective cable-net structure

Dhakal

Bhandary

Yatabe

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. An innovative configuration of pocket-type rockfall protective cable-net structure, known as Long-span Pocket-type Rock-net (LPR), has been developed in Japan. The global performance of the proposed system was initially checked by the experimental (full-scale) modelling. Given the various limitations of the physical experiments, particularly for the parametric study to have a detailed understanding of the newly developed system, a reliable and simplified method of numerical modelling is felt necessary. Again, given the sophistication involved with the method of numerical simulation, a yet simplified modelling approach may prove more effective. On top of this background, this paper presents a three-tier modelling of a design of LPR. After physical modelling, which has revealed that the displacement response may be taken more vital for LPR performance, Finite Element based numerical modelling is presented. The programme LS-DYNA is used and the models are calibrated and verified with the element-and structure-level experiments. Finally, a simple analytical modelling consisting of the equivalently linear and elastic, lumped-mass, singledegree-of-freedom system, capable of predicting the global displacement response, is proposed based on the basic principles of conservation of linear momentum and energy. The model is back-calculated and modified from the analyses of the verified numerical model.

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“…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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Centrifuge modeling of railway embankments in terms of high moisture content of soil

Cited by 5 publications

References 0 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

Experimental, numerical and analytical modelling of a newly developed rockfall protective cable-net structure

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

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