Dynamic behavior of a concrete dam impacted by debris flows with rock

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 161-168.

LIU Chun1,YU Zhixiang1,2,LUO Liru1,GU Song3,ZHAO Shichun1,2

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Abstract

Aiming at the dynamic problem of a concrete dam impacted by debris flows with rock, based on the existing coupled SPH-FEM method, considering the coupled dynamic behaviors between rock-slurry-dam, a three-dimensional coupled numerical model was established.The dynamic behaviors of debris flows with rock including the impact process, impact force time-history, key point displacement time-history and dam damage were analyzed respectively.According to the damage mechanism of the dam and the engineering practice, three optimized anti-collision countermeasures, i.e., reducing the slope ratio, adding anti-collision piers and adding the buffer layer were analyzed.The results show that the coupled SPH-FEM method can reproduce the impact, climb and back-silting phenomena; the concentrated load of rock can easily cause the local damage of the dam;based on the comprehensive analysis of the decrease extent of impact force and the damage condition of the dam, the anti-collision ability of the dam with the buffer layer is optimal.The results obtained from the study are useful for the facilitating design of dam against debris flows with rock.

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coupled SPH-FEM method / debris flows with rock / dynamic behavior / numerical simulation / concrete dam

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LIU Chun1,YU Zhixiang1,2,LUO Liru1,GU Song3,ZHAO Shichun1,2. Dynamic behavior of a concrete dam impacted by debris flows with rock[J]. Journal of Vibration and Shock, 2019, 38(14): 161-168

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