Dam Safety Analysis Of Bulb Tubular Hydropower Station Based On Fluid-solid Coupling

The safety of hydropower dams is the focus of attention during the operation of hydropower stations.Especially in the flood season,the safety of hydropower dams is related to the safety of life and property of the downstream people.Although the hydropower station is relatively low in water head,it is close to the city.Once the dam breaks,it directly threatens the safety of the whole city.Therefore,the dam safety problem of the cross-flow hydropower station is attracting more and more scholars' attention.The deformation analysis of the dam involves many disciplines.The choice of analytical methods is directly related to the judgment and prediction of dam safety.The correct and appropriate analysis method can understand the safety status of the dam and predict the dam in the extreme.Reliability of buildings in flood conditions.In this paper,a typical tubular hydropower station in the mainstream of the Yellow River is selected as the research object.The numerical simulation method is used to analyze the deformation characteristics of the dam structure under different discharge conditions.First,based on the relevant design drawings and parameters of the research object,a threedimensional model of the main structure of the dam is established.By changing the opening of the gate and the opening and closing of the unit,the dam model for checking and designing the flood conditions is obtained.The numerical simulation of the calibration and design flood conditions is carried out to obtain the corresponding discharge flow state and flow rate,and the calculation results are The comparison of the hydraulic model test results verifies the correctness and reliability of the numerical calculation method and model.Secondly,by changing the opening of the gate and the opening and closing of the unit,the dam model of the five operating conditions discharge schemes with the reservoir water level of 1551 m determined by the hydraulic model test is obtained,and the numerical simulation of each discharge scheme is obtained.The deformation characteristics of the dam structure with different discharge schemes are analyzed by analyzing the deformation characteristics of the dams of the five discharge schemes,and the optimal discharge scheme considering only the influence of fluid-solid coupling on deformation is selected.Finally,the unit opening and closing situation in the optimal discharge scheme is changed,and the numerical simulation of the opening and closing conditions of different units is carried out,and the deformation characteristics of the dam in each unit's opening and closing scheme are obtained.The research results show that the main deformation of the dam occurs on the piers and gates of the flood discharge gates under the operating conditions of the reservoir water level of 1551 m.Among the five discharge schemes,the gates No 2 and No 4 open 8.2m in discharge scheme(3),the deformation of the pier and gate is the smallest.It is the optimal discharge scheme when considering only the influence of fluid-solid coupling on deformation.The different units' opening and closing mode has little effect on the deformation of the dam,and it is not the main influence of dam deformation.factor.