Influence of two-layer flooding orifices on seismic performance of high arch dams
For super high arch dams with a height of over 200m in the strong earthquake zone at home,multi-lay-er flooding orifices are usually arranged in the middle and upper dam body with significant dynamic response.It is necessary to study the influence of orifices and pier structures on the seismic performance of arch dams.Taking the Xulong super high arch dam on the upper reaches of the Jinsha River as an example and considering the dynamic damage effects of the concrete,the dam's overall stress and deformation,the damage of dam body,ultimate aseismic bearing capacity and other aspects are compared and analyzed for the dam with or without flooding orifices.The results show that,the flooding orifices have little effect on the overall rigidity and strength of the dam,and the reasonable arrangement of the flooding orifice has a limited impact on the aseismic safety of the arch dam;due to the overhang pier and its section changes and the weakening effect,the junctions between the root of the pier and dam body,the connection of the upstream pier beam are more likely to be damaged during the strong earthquakes,so aseismic design is required.As far as the arch dam with the crest and middle flooding orifice is concerned,the part between the two layers of orifices is also a weak link in seismic safety,and targeted aseismic measures need to be taken to enhance the ability to resist earthquake damage.
high arch damseismic safety performanceconcrete damageflooding orificeXulong
万方数据
维普
