高坝大库上游库区爆破水力冲击危险性分析

Risk analysis for hydraulic blasting at upstream reservoir area of high dam

高坝大库上游库区内水下爆炸作用于混凝土高坝上游将产生强烈冲击波,同时将影响坝体的稳定甚至造成溃坝。本文利用极限平衡状态法,定量分析了在上游库区水下爆炸作用下坝体的受力情况,并结合重力坝实例估算出坝体抵抗破坏的极限承载力,进而利用微分法优化了坝前冲击波的受力计算方法。研究结果表明:本文提出的计算方法能够较真实地反映坝前爆炸作用于混凝土高坝的受力情况。

The underwater explosion action within the upstream reservoir area of high dam will produce strong shock waves on concrete dam and affect the stability of dam , even cause the break of dam.. Using limit equilibrium method, this paper quantitatively analyzed the force situation of dam under the action of underwater explosion force. A related gravity dam example was given to estimate the ultimate bearing ca- pacity of the dam to resist damage, and then the differential stress calculation method is used to optimize the calculation method of stress in front of the dam. The result showed hat the proposed method can roughly reflect the force of explosion witch accurately effect on concrete dam in the front of dam.