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

Song, Dongri; Choi, Clarence Edward; Ng, Charles Wang Wai; Zhou, Gordon G. D.; Kwan, J.S.H.; Sze, H. Y.; Zheng, Yu

doi:10.1007/s10346-019-01243-2

Cited by 41 publications

(13 citation statements)

References 28 publications

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“…The force fluctuations of F b are induced by F s − b since F f − b is very smooth. Similar phenomena have been recorded in centrifuge tests with both rigid and flexible barriers (Song, Choi, Zhou, et al., 2018; Song et al., 2019).…”

Section: Resultssupporting

confidence: 79%

“…The peak load reduction ratios for both flexible and slit barriers are calculated by

{\xi }_{\mathrm{F}\mathrm{B}\,}=\left({F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}\,}-{F}_{b,\mathrm{F}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}\right)/{F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}

and

{\xi }_{\mathrm{S}\mathrm{D}}=\left({F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}-{F}_{b,\mathrm{S}\mathrm{D}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}\right)/{F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}

, respectively. In addition, ξ FB obtained from 14 centrifuge tests with bouldery and the boulder‐debris mixture flows (Song, Choi, Zhou, et al., 2018; Song et al., 2019) and ξ SD measured from dry granular flow against open‐type dams (Choi et al., 2020) have been plotted for comparison in Figure 7. We can see that ξ FB extracted from the numerical results in this study ranges from 0.63 to 0.89, which is overall consistent with the estimation of ξ FB ranging from 0.54 to 0.96 obtained from centrifuge tests by Song et al.…”

Section: Resultsmentioning

confidence: 99%

“…The color of half‐solid diamonds represent the normalized boulder diameter δ / h 0 of impinging flows performed by Song et al. (2019).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, ξ FB obtained from 14 centrifuge tests with bouldery and the boulder-debris mixture flows Song et al, 2019) and ξ SD measured from dry granular flow against open-type dams (Choi et al, 2020) have been plotted for comparison in Figure 7. We can see that ξ FB extracted from the numerical results in this study ranges from 0.63 to 0.89, which is overall consistent with the estimation of ξ FB ranging from 0.54 to 0.96 obtained from centrifuge tests by Song et al (2019). Note that dry boulder-debris mixture flows with varying δ/h 0 (0.07∼1) against an impermeable flexible barrier made by membrane are performed by Song et al (2019).…”

Section: 𝑏𝑏mentioning

confidence: 99%

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How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

Kong

Guan

et al. 2022

JGR Earth Surface

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The ever-growing climate change, extreme weather events, and continuous expansion of human populations into mountainous regions have contributed to the increase in the frequency, intensity, and duration of catastrophic geophysical mass flows (Fowler et al., 2021;Guerreiro et al., 2018;Hirschberg et al., 2021), such as debris flows, lahars and avalanches. In practical combats of these flows, flexible, slit, and rigid barriers (see Figure S1 in Supporting Information S1) are designed to reduce their peak discharge, flow velocity, erosion, and run-out distance (Gong et al., 2021;Iverson et al., 2016;Marchi et al., 2019). Nonetheless, current practice on the selection of barrier types and associated design has been largely empirical, since there is no unified analytical tool available for systematic analysis and comparison of their performance in arresting impinging flows of variable nature. This is due to the difficulties posed by the modeling of multi-body and multi-phase interactions. For

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Section: Resultssupporting

confidence: 79%

“…The peak load reduction ratios for both flexible and slit barriers are calculated by

{\xi }_{\mathrm{F}\mathrm{B}\,}=\left({F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}\,}-{F}_{b,\mathrm{F}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}\right)/{F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}

and

{\xi }_{\mathrm{S}\mathrm{D}}=\left({F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}-{F}_{b,\mathrm{S}\mathrm{D}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}\right)/{F}_{b,\mathrm{R}\mathrm{B}}^{\mathrm{P}\mathrm{e}\mathrm{a}\mathrm{k}}

Section: Resultsmentioning

confidence: 99%

“…The color of half‐solid diamonds represent the normalized boulder diameter δ / h 0 of impinging flows performed by Song et al. (2019).…”

Section: Resultsmentioning

confidence: 99%

Section: 𝑏𝑏mentioning

confidence: 99%

See 2 more Smart Citations

How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

Kong

Guan

et al. 2022

JGR Earth Surface

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show abstract

“…Predominant impulse loads can be induced by bouldery debris flows, in which large boulders or rock fragments are involved in the flow mass. Although the α or m value in the adopted model implicitly covers some of the impact loads by large boulders or rock fragments (Song et al 2019), the sharp impulse loads cannot be well described. Such loads can cause severe D r a f t damage to structures and the failure mode of buildings may change, e.g., from globe pushover failure to progressive failure of local columns.…”

Section: Debris-flow Impact Load and Associated Uncertaintiesmentioning

confidence: 99%

Reliability-based formulation of building vulnerability to debris flow impacts

Luo

Zhang

et al. 2022

Can. Geotech. J.

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Physical building vulnerability to debris flows is defined as the potential damage degree of buildings for a given debris-flow intensity. In this paper, the physical characteristics on both debris flow intensity and building response are considered. Uncertainties in building capacity and debris flow intensity are explicitly quantified to evaluate the damage probability of a typical reinforced concrete building subject to debris flow impact. Four damage states with clear failure mechanisms are defined using multi-source information from field observations, numerical simulation and expert experience. Two series of fragility models have been proposed based on practical debris-flow impact pressure models. Several debris flow intensity measures are investigated. A better indication can be provided using the intensity measure that represents specific failure mechanism, for example, impact force (hv2) for force-dominated failures or overturning moment (h2v2) for moment dominated failures, where h and v are debris flow depth and velocity, respectively. The corresponding fragility surfaces best express the potential building damage. The intensity thresholds in the proposed fragility curves are consistent with those in empirical vulnerability curves. The methodology presented in this paper promotes the vulnerability assessment using physics based modeling, leading to a more reliable evaluation of building damage caused by debris flows.

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Towards an Optimization of Foundation Anchors of Landslide-Resisting Flexible Barriers: Dynamic Pullout Resistance of Anchors

Choi,

Zhang,

Xiong

2024

Progress in Landslide Research and Technology

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Existing research on the design of flexible barriers to arrest the landslide mass mainly focuses on the optimization of the superstructure. Little attention has been given to the optimization of the foundation anchors used to transmit dynamic impact loading from the landslides to the ground. In fact, existing design guidelines for foundation anchors of landslide-resisting flexible barriers are based on quasi-static pullout theories even though field evidence suggests that the dynamic response of an anchor is fundamentally different. In this study, a new analytical model is proposed to predict the peak pullout resistance for anchors subjected to dynamic loading in saturated sand. A novel experimental apparatus was developed to evaluate the proposed analytical model. Dynamic effects are profound in saturated sand and less so in dry sand. Rate strengthening at the soil-anchor interface is governed by pore pressure change from dilation and soil damping. The proposed model is shown to give close predictions of the measured peak dynamic pullout resistance, which is up to three times those under quasi-static conditions. Findings imply that rate strengthening changes the critical failure mechanism of a foundation anchor from the soil-anchor interface for quasi-static loading to the potential rupturing of the steel tendon for dynamic loading. This study highlights the need for the dynamic analysis of foundation anchors of landslide-resisting flexible barriers.

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

Cited by 41 publications

References 28 publications

How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

Reliability-based formulation of building vulnerability to debris flow impacts

Towards an Optimization of Foundation Anchors of Landslide-Resisting Flexible Barriers: Dynamic Pullout Resistance of Anchors

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