Author(s): Huang Guobing; Wang Caihuan
Linked Author(s):
Keywords: High arch dam; Cushion pool; Time average pressure; Pulsatingpressure; Stability of base slab; Depth of cushion; Energy dissipationeffect
Abstract: The energy dissipation effect of Cushion pool and the stress characteristics &stability of apron slab of high arch dam have been paid close attention in the field of engineering construction. According to the study results at home and abroad and the hydraulic model test data in Goupitan Project, This paper illustrates the energy dissipation mechanism and the yardstick for energy dissipation effect of cushion pool, analyses the stress and stability against floatation of base slab. The flow pattern of cushion pool is very complicated, which can be treated as the composite flow of submerged impact jet and jump flow qualitatively. The energy dissipation effect can be measured by the volume damping ratio impact pressure of slab, the hydraulic characteristics of pool tail and subsidiary dam crest, and the indices of downstream scour etc. The stress characteristics and distribution of base slab are the important basis of design and calculation for stability against floatation. It is necessary to point out that the effective water stop, pump & drainage and anchorage, and the rational slab size and thickness are the guarantee of slab stability.
Year: 2001