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Articles by C. E. Choi
A Physical and Numerical Investigation of Flow–Barrier Interaction for the Design of a Multiple-Barrier System | Journal of Geotechnical and Geoenvironmental Engineering | Vol 149, No 1
Abstract Multiple barriers have become popular to mitigate debris flows worldwide. Existing guidelines only recommend the minimum spacing based on volume retention, and the influence of flow–barrier interaction is ignored. It is obvious that understanding the flow–barrier interaction for a multiple-barrier system is imperative for safer and more economical designs. In this study, a physical experiment of debris flow impacting a dual rigid barrier system conducted in a 28-m-long flume is presented.
Impact mechanisms of granular and viscous flows on rigid and flexible barriers
Structural countermeasures such as rigid and flexible barriers are commonly installed in mountainous regions to intercept mass-wasting processes. Without sufficient and reliable comparable physical data, the study of impact mechanisms remains difficult and not well understood. In this study, a newly developed flexible model barrier together with a rigid barrier are used to simulate either dry granular or viscous liquid impacts on these model barriers in a geotechnical centrifuge.
Flume investigation of the influence of rigid barrier deflector angle on dry granular overflow mechanisms
Mass-wasting processes are often intercepted using rigid barriers, which are sometimes equipped with deflectors to prevent overspilling. Despite the engineering value of deflectors, they are currently only installed using empirical and prescriptive approaches because flow interaction mechanisms are not well understood. A 5 m flume was used to study dry granular flow deposition and overflow processes with and without deflectors of varying angles.
Large-scale successive boulder impacts on a rigid barrier shielded by gabions
Debris flows occur in multiple surges. Boulders entrained within the flow have been reported to incapacitate structures within its flow path. Single-layer cushions, such as gabions, are often installed to shield debris-resisting barriers from boulder impact. However, most relevant works only focus on single impact and the performance of gabions subjected to successive loading is still not well understood.
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