多级孔板泄洪洞的结构动力可靠性研究

RESEARCH OF DYNAMIC RELIABILITY OF THE MULTI-ORIFICE ENERGY DISSIPATER WITHIN FLOOD DISCHARGE TUNNEL

以黄河小浪底工程中多级孔板泄洪洞为背景,运用随机振动理论,研究了多级孔板泄洪洞中水流脉动荷载对其孔板、衬砌及围岩的动力影响,并基于首次超越破坏机制,讨论了其结构的动力可靠性。

The multi-orifice energy dissipater within a flood discharge tunnel is a new type of energy dissipater of hydraulic flow. But much of it remains to be investigated. We take the XIAOLANGDI project on the Yellow River as an example. The multi-orifice plate dissipaters are proposed for its flood discharge tunnel. The theory of random vibration is applied to study the dynamic effects on the tunnel lining, its bedrock and the orifice plates by the fluctuating pressure within the flood discharge tunnel. Based on the theory of chance failure of first passage discussions were made about the dynamic reliability of the structure. It is found that for the project of XIAOLANGDI on the Yellow River this proposal of multi-orifice energy dissipaters within the flood discharge tunnel is preferable.