Design of flexible barriers against sizeable landslides in Hong Kong

Sze, Eric H. Y.; Koo, R.C.H.; Leung, Jojo M Y; Ho, Ken

doi:10.1080/1023697x.2018.1462107

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…1), and using the suggested dynamic pressure coefficient from this study. NIDA-MNN is a finite element design tool commonly used in Hong Kong for the structural design of flexible barriers (Sze et al, 2018). This is followed by a comparison between the numerical predictions, in terms of the cable loads and barrier deformation, and field measurements.…”

Section: Results Of α Valuesmentioning

confidence: 99%

Study of dynamic debris impact load on flexible debris-resisting barriers and the dynamic pressure coefficient

Lam¹,

Sze²,

Wong³

et al. 2022

Can. Geotech. J.

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The use of steel flexible barriers to mitigate landslide risk on natural hillsides is becoming common in the last decade in Hong Kong. The current design approach for this kind of barrier structure involves the adoption of the hydrodynamic load model to predict dynamic impact forces, followed by non-linear structural analyses of flexible barriers using numerical programs based on the pseudo-static method. From local guidelines, the dynamic pressure coefficient is taken as 2.0. This empirically considers the effect of impacts from boulders up to 2.0m in diameter. With a view to rationalising the design approach, a series of physical impact tests and numerical analyses was conducted to investigate the dynamic impact on flexible barriers and the resulting barrier response. The tests involved up to 9m³ of debris resisted by a 1.5m high steel barrier, conducted at the 28m long flume facility at the Kadoorie Centre, Hong Kong. Numerical modelling using computer programs LS-DYNA and NIDA-MNN was conducted to analyse the dynamic response. The study aims to evaluate the dynamic pressure coefficient and to verify the current design approach. Results indicate that a coefficient of 1.0 is in general appropriate for design purposes for debris comprising primarily water and fine-grained particles.

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Section: Results Of α Valuesmentioning

confidence: 99%

Study of dynamic debris impact load on flexible debris-resisting barriers and the dynamic pressure coefficient

Lam¹,

Sze²,

Wong³

et al. 2022

Can. Geotech. J.

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show abstract

“…This program was used by Kwan et al (2014) to back-analyse a case history of a shallow landslide impacting on a steel flexible barrier in Hong Kong. Sze et al (2018) also adopted this program for the design of flexible debris-resisting barriers in practice. A common feature of these computer programs is that the analysis is decoupled, meaning that the evaluation of the impact loading and the structural assessment are carried out separately.…”

Section: Review Of Current Design Practicementioning

confidence: 99%

Finite element analysis for rockfall and debris flow mitigation works

2019

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Landslide risks arising from boulder falls and debris flows are commonly mitigated using rigid and flexible barriers. Debris-barrier interaction is a complicated process so current design methods rely on the use of the pseudo-static force approach. In addition to physical testing, numerical simulations can be used to provide insight into the impact mechanism. This paper presents the applications of numerical models to simulate rigid and flexible barriers subjected to rockfall and debris flow impacts respectively. For rigid barriers, rock-filled gabions, recycled glass cullet, cellular glass aggregates and EVA foam were assessed for their performance as cushioning materials. From the results, empirical equations were established for predicting the boulder impact forces and penetration into the cushion layer. Amongst the materials considered in this study, rock-filled gabions appear to be the most promising for use in practice. For flexible barriers, finite-element models, calibrated using documented case histories, were developed to simulate the debris-barrier interaction. The models were used to investigate the barriers' behaviour under debris impacts from both force and energy perspectives. From the results, the hydrodynamic pressure coefficient was found to be lower than the current recommended value whilst only a small amount of debris energy was transferred to the barrier.

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Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact

Song

Choi

et al. 2019

Landslides

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Design of flexible barriers against sizeable landslides in Hong Kong

Cited by 8 publications

References 4 publications

Study of dynamic debris impact load on flexible debris-resisting barriers and the dynamic pressure coefficient

Study of dynamic debris impact load on flexible debris-resisting barriers and the dynamic pressure coefficient

Finite element analysis for rockfall and debris flow mitigation works

Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact

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