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Response characteristics of plunge pool slabs of Xiaxiluodu Hydropower deformation conditions

Earthquake Research Advances 2022年第4期2卷 28-38页

作者： Jie Yuan Qianwei Xi Xin Jia Yang Zhou Yu Hu National Institute of Natural Hazards Ministry of Emergency ManagementBeijing100085China State Key Laboratory of Hydroscience and Hydropower Engineering Tsinghua UniversityBeijing100084China Xiluodu Power Plant China Yangtze Power Co.Ltd.ZhaotongYunnan657300China

The key problem of the energy dissipation scheme of the arch dam body flood discharge and plunge pool below the dam is the stability problem of the plunge pool slab.As the protection structure of the underwater bed,the plunge pool slab bears the continuous impact of high-speed water flow.The hourly average dynamic water pressure on the slab is one of the main loads directly affecting the stability of the slab and is the main factor causing its erosion destruction.After the impoundment of the Xiluodu Hydropower Station,the measuring line of valley width in the plunge pool area has been continuously shrinking.By 2020,the cumulative shrinking value is about 80 mm.In light of the general background condition of valley shrinkage,daily inspection,annual detailed inspection,underwater inspection and drainage inspection of the plunge pool found that the plunge pool has experienced different degrees of damage,which greatly influences the long-term safety stability of the plunge pool.In this paper,the prototype observation data of flood discharge is used as the input load of pulsatingpressure,and the stress and displacement distribution of the plunge pool structure under the vibration load of flood discharge is analyzed under the condition that the stress and strain state of the plunge pool is changed under the influence of valley displacement.The results show that the stress,strain,and displacement distribution of the plunge pool are mainly caused by valley deformation,the vibration caused by flood discharge is little in influence,and the impact effect of deep hole flood discharge tongue on the plunge pool slab is weak.

关键词： Valley deformation Plunge pool flood discharge pulsating pressure Finite element

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