Study On Vibration Charateristics Of Slabs In The Inverted Arch Plunge Pool

Plunge cushion pool is an effective measurement to protect river bed from scouring by the action of flow discharge through jets from outlets in high arch dam. In order to disclose destroy mechanism of the slab, and apply plunge pool widely, it is necessary to research vibration characteristics of slab set in the inverted plunge pool in detail.By making theoretical analysis on vibration characteristics of a single slab and multi ones set in the inverted arch ring, four processes about stability failure, that is free vibration, locking, sleeking and distortion are proposed on the condition that water sealing was damaged and anchor-hold was out of action, a formula of the slab's maximum free displacement and dynamic equations in each process are obtained.A fine plunge pool model is found on the base of gravity similar rule, and the slab is made of synthetic rubber.Experimental research on the vibration of single slab and multi ones set in the arch ring is carried out in the first time. Slab vibration divisions along the water flow are proposed and their lists are determined. Laws of vibration distribution along water flow, across the arch ring, in time zone and frequency one are established. The most dangerous condition to slab's stability is obtained by comparing slab vibration in the different downstream depth.After making an integrated analysis of result, a chain reaction of invalidation of slab anchor-hold and the effect of increase in gap width are proposed, and stability failure mechanism of slabs is opened out.