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Guangdong Yang,Gaohui Wang,Wenbo Lu,Peng Yan,Ming Chen,Xinxia Wu 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.8
The damage prediction of high dams under the attacks of earth-penetrating weapons has gained significant importance in recentyears. For this purpose, a SPH-Lagrangian-Eulerian coupled approach is proposed to describe the damage processes of concretegravity dams subjected to the combined action of the penetration and explosion. The SPH method is used to model the concretematerial with the large deformation near the penetration and explosion regions. The Lagrangian algorithm is adopted to simulate thehigh-velocity projectile and dam body with the small distortion. And the Eulerian algorithm is employed to describe the dynamicbehavior of the water and air media. The validity of the penetration model is calibrated against a previous penetration test. Meanwhile, the SPH-Lagrangian-Eulerian coupled method is verified by implementing an underwater explosion test in a concretecube. The computed distribution of cracking damage is consistent with the result of the experimental test, which validates the validityof the proposed SPH-Lagrangian-Eulerian coupling method. Subsequently, the penetration processes of a concrete gravity dam underthe high-velocity projectile are presented. After the rapid penetration, the explosives are detonated in the dam with the initialpenetration damage. The shock wave propagation characteristics in the dam and reservoir water are discussed. The failure processesand dynamic responses of the dam subjected to the combined action of the penetration and explosion are investigated. The influenceof the initial penetration damage and the reservoir water on the failure processes of the dam subjected to the internal blast loading is alsodiscussed. The results show that the penetration of the high-velocity projectile only causes a local damage to the concrete gravity dam. However, the combined effects of the penetration and explosion cause significantly more damage to the upper region of the dam.
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