| The problem of fluid-induced vibration caused by high spillage is always the focus of research in the field of high spillage and even in the field of high dam spillage safety.The previous research on the vibration caused by high dam spillage mainly focuses on the spillway buildings themselves,and there are few reports on the study on the vibration caused by the surrounding environment.However,in the process of transmission of high-dam flood-induced vibration to surrounding sites,the amplification of site conditions will have adverse effects on the structural safety of buildings and the physical and mental health of people.In recent years,the study on the ground vibration induced by high dam spillage has received some attention.The existing research results show that the opening way of spillway has a great influence on the site vibration,and the optimal dispatch from the source to reduce the excitation is an important measure to control the ground vibration induced by spillway.Therefore,based on the water elasticity model of eastern Germany,this paper designed a large number of tests under the conditions of surface discharge,middle outlet discharge and combined surface discharge,and mainly conducted the following research:(1)Based on the model test results,the vibration distribution rules of the ground and the slope under different flood discharge modes were studied,and the influence of flow rate,number of holes in the table and opening degree on the site vibration under different working conditions was analyzed.The results show that there is a certain regularity in the vibration distribution of the bedrock at the bottom of the reservoir and the slope at the bottom of the reservoir.In the case of combined flood discharge in the table,according to the different degrees of opening of the table hole,the vibration distribution presents two categories.One type is mainly affected by the location of the water tongue of the middle hole,and its vibration distribution is similar to that of the middle hole.The distribution of the vibration is similar to that of the discharge from the overburden.(2)Analyze the influence of flow rate,number of holes in the table and opening degree of holes on vibration of foundation and slope under different flood discharge modes.The results show that under various flood discharge modes,the vibration of foundation and slope is positively correlated with the flow rate on the whole,but the influence of the number of holes and the opening degree shows a complex correlation with the vibration of foundation and slope as the working condition changes.(3)All the conditions of opening way of quantitative representation and flow together as the BP neural network input layer neurons,all flow conditions of ground vibration prediction model is established,and the prediction results verified,and the results show that the model of foundation and slope of the vibration table hole spillway prediction error within the 0.1 gal,the working condition of the hole in the table and joint flood forecast error within 0.2 gal.The vibration prediction model was established separately for the combined flood discharge conditions in the table,and the prediction accuracy was improved,and the error between the predicted value and the measured value was within 0.1gal.(4)Compare the working conditions with similar flow rates at different flow levels,and comprehensively consider the vibration situation of the fou ndation and slope,propose three kinds of optimized flood discharge optimization schemes under different flow rates,namely,0~1500m3/s,1500mm3/s,and over14000 m m3/s,to provide reference for engineering practice. |
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