11:15 〜 11:30
[HDS07-09] Dynamic Processes and Potential Mitigation Strategies of Rapid Dry Granular Geohazards: Insights from Gravity-Driven Chute Experiments
キーワード：Granular flows, Chute experiment, Dynamic process, Deposition characteristics, Mitigation strategy
Granular flow, a common geohazard in high-mountain regions, often results in significant economic losses and casualties due to its complex dynamic movement. To better understand its intricate behaviour and potential mitigation measures, particularly under high-speed conditions, a series of laboratory experiments were conducted. Various particle sizes and rigid obstacles were considered to examine the interactions between rapid granular flows and different mitigation structures.
In particular, rigid obstacles, such as arrays of baffles and rigid dams, are regarded as effective measures for managing rapid channelized granular flows. This study investigates the deposition process of six types of debris sands with varying particle sizes in a 4.28 m-long chute with adjustable incline angles. Structure from Motion (SfM) and other advanced image analysis techniques were employed to analyse the characteristics of the deposits, including their time histories. These methods allow for precise measurements of key depositional parameters, such as run-out distance, width, depth, and area, which are crucial for evaluating the effectiveness of the mitigation structures.
Experimental results indicate that particle size significantly influences the final deposition pattern, as it governs the rheological behaviour of the flow. The observations highlight distinct shape characteristics and unexpected behaviours in the time-history analysis. From a practical perspective, the findings suggest that the design of protective barriers requires a trade-off between the length, width, and depth of deposition, which must be tailored to the specific structure being protected.
In particular, rigid obstacles, such as arrays of baffles and rigid dams, are regarded as effective measures for managing rapid channelized granular flows. This study investigates the deposition process of six types of debris sands with varying particle sizes in a 4.28 m-long chute with adjustable incline angles. Structure from Motion (SfM) and other advanced image analysis techniques were employed to analyse the characteristics of the deposits, including their time histories. These methods allow for precise measurements of key depositional parameters, such as run-out distance, width, depth, and area, which are crucial for evaluating the effectiveness of the mitigation structures.
Experimental results indicate that particle size significantly influences the final deposition pattern, as it governs the rheological behaviour of the flow. The observations highlight distinct shape characteristics and unexpected behaviours in the time-history analysis. From a practical perspective, the findings suggest that the design of protective barriers requires a trade-off between the length, width, and depth of deposition, which must be tailored to the specific structure being protected.