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Article: Effects of barrier deformability on load reduction and energy dissipation of granular flow impact
Title | Effects of barrier deformability on load reduction and energy dissipation of granular flow impact |
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Authors | |
Keywords | Granular flow Impact Deformable barrier Flexural rigidity Material point method |
Issue Date | 2020 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/compgeo |
Citation | Computers and Geotechnics, 2020, v. 121, p. article no. 103445 How to Cite? |
Abstract | Granular flows, such as debris flows, are commonly arrested by using deformable barriers, but their designs rely heavily on empiricism. The fundamental impact mechanisms between a granular flow and a deformable barrier have yet to be elucidated. Thus, estimating the impact load on deformable barriers remains a key scientific and engineering challenge. In this paper, the material point method (MPM), with the Drucker-Prager yield criterion associated with a linear elastic model is calibrated against physical model tests. The effects of barrier deformability on the impact force induced by a granular flow are examined. For simplicity, a vertical and deformable cantilever barrier with different flexural rigidity is simulated. The dissipation of energy of a frictional granular assembly subjected to shear is considered in the simulation. A threshold 3EI/H3norm = 6.3 × 10−5 (normalized by the stiffness of a typical 1-m thick reinforced concrete cantilever barrier) is identified in this study to demarcate between rigid and deformable barriers. A maximum deformation of only 3% of the total barrier height and corresponding reduced relative velocity are enough to attenuate the peak impact load by 40% compared to a rigid barrier. Around 85% of the dissipated energy occurs during the pile-up process, the interaction between the incoming flow and deposited material along the slip interface is effective in dissipating flow kinetic energy. |
Persistent Identifier | http://hdl.handle.net/10722/284028 |
ISSN | 2023 Impact Factor: 5.3 2023 SCImago Journal Rankings: 1.725 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Ng, CWW | - |
dc.contributor.author | Wang, C | - |
dc.contributor.author | Choi, CE | - |
dc.contributor.author | De Silva, WARK | - |
dc.contributor.author | Poudyal, S | - |
dc.date.accessioned | 2020-07-20T05:55:26Z | - |
dc.date.available | 2020-07-20T05:55:26Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Computers and Geotechnics, 2020, v. 121, p. article no. 103445 | - |
dc.identifier.issn | 0266-352X | - |
dc.identifier.uri | http://hdl.handle.net/10722/284028 | - |
dc.description.abstract | Granular flows, such as debris flows, are commonly arrested by using deformable barriers, but their designs rely heavily on empiricism. The fundamental impact mechanisms between a granular flow and a deformable barrier have yet to be elucidated. Thus, estimating the impact load on deformable barriers remains a key scientific and engineering challenge. In this paper, the material point method (MPM), with the Drucker-Prager yield criterion associated with a linear elastic model is calibrated against physical model tests. The effects of barrier deformability on the impact force induced by a granular flow are examined. For simplicity, a vertical and deformable cantilever barrier with different flexural rigidity is simulated. The dissipation of energy of a frictional granular assembly subjected to shear is considered in the simulation. A threshold 3EI/H3norm = 6.3 × 10−5 (normalized by the stiffness of a typical 1-m thick reinforced concrete cantilever barrier) is identified in this study to demarcate between rigid and deformable barriers. A maximum deformation of only 3% of the total barrier height and corresponding reduced relative velocity are enough to attenuate the peak impact load by 40% compared to a rigid barrier. Around 85% of the dissipated energy occurs during the pile-up process, the interaction between the incoming flow and deposited material along the slip interface is effective in dissipating flow kinetic energy. | - |
dc.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/compgeo | - |
dc.relation.ispartof | Computers and Geotechnics | - |
dc.subject | Granular flow | - |
dc.subject | Impact | - |
dc.subject | Deformable barrier | - |
dc.subject | Flexural rigidity | - |
dc.subject | Material point method | - |
dc.title | Effects of barrier deformability on load reduction and energy dissipation of granular flow impact | - |
dc.type | Article | - |
dc.identifier.email | Choi, CE: cechoi@hku.hk | - |
dc.identifier.authority | Choi, CE=rp02576 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.compgeo.2020.103445 | - |
dc.identifier.scopus | eid_2-s2.0-85078467806 | - |
dc.identifier.hkuros | 311033 | - |
dc.identifier.volume | 121 | - |
dc.identifier.spage | article no. 103445 | - |
dc.identifier.epage | article no. 103445 | - |
dc.identifier.isi | WOS:000531079300017 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0266-352X | - |