Abstract
Explosives are considered an effective method of breaking an ice jam or clearing an ice barrier. As underwater explosions can have a severely destructive impact on ice sheets, investigating the damage mechanism and dynamic characteristics of the ice sheet is significant. This paper presents a study on the ice damage characteristics subjected to single and combination explosives utilizing the Arbitrary-Lagrangian-Eulerian (ALE) technique to solve the Fluid-Structure interaction (FSI) processes between the fluid and ice structures. The numerical model is validated by reference results and experimental data. The damage evolution and mechanism of the ice sheet are analysed. The different responses of the ice sheet subjected to underwater contact and underwater explosions are discussed. In addition, the critical explosion charge just sufficient to break the ice is investigated. Moreover, the ice damage characteristics from two explosives in combination are analysed. The results demonstrate that the damage to the ice sheet induced by the underwater explosion is significantly larger than an underwater contact explosion with an equal charge mass; The blast efficiency of the two combination explosives with a suitable spacing distance in the horizontal direction is higher than that of a single explosive with an equal charge mass. The analyses and results provide a reference for the ice-breaking engineering.
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