Optimization Research On Discharge And Energy Dissipation Arrangement Of High Arch Dam Body

With the acceleration of the construction speed of high dams in China,its energy dissipation and anti-shock problem is one of the important technical problems of such projects.However,there are few studies on the lateral comparison of the effects of deep hole air collision energy dissipation and non-collision elimination in the same project.It is rare to analyze the influence of the opening and closing energy gate opening changes.Therefore,the horizontal comparison study of different flood discharge arrangements,as well as the impact of gate opening changes on energy dissipation effects,has practical significance and engineering application value.Based on the model of Dongzhuang Water Conservancy Project,this paper compares the energy dissipation effect of deep collision air energy and non-collision energy dissipation in the deep hole,and changes the gate opening degree and the pulsating pressure of the water cushion pond floor in the incomplete collision type.Quantitative analysis of the relationship between the main research contents are as follows:（1）The model experiment is used to compare the non-collision energy dissipation,air collision energy dissipation and air incomplete collision energy dissipation modes in the deep hole air.The three types of layout are measured.The average pressure and fluctuating pressure of the water cushion pond floor under different working conditions are measured.At design water level,the time-average impact pressure of the incompletely colliding energy-dissipating plunge pool floor is 10.23m,which is 9.46m and 4.30m lower than the air collision energy dissipation and non-collision energy dissipation respectively;the fluctuation pressure mean square the peak value of the root is 7.50m,which is 8.55m and 5.57m lower than the air collision energy dissipation and collision-free energy dissipation.The results show that the energy dissipation effect of incomplete collision in the air is the best.（2）The gate opening degree adjustment experiments are carried out for the incomplete collision in the air,and the influence of the change of the gate opening on the root-mean square distribution of the fluctuating pressure of the plunge pool bottom is analyzed.With the increase of Q_m/Q_sat the same flow rate,when the up outlets are flooded separately,the peak value of the root-mean square of the fluctuating pressure is transferred from the central axis to the right bottom;when the deep hole is discharged separately,the peak value of the root-mean square of the fluctuating pressure moves upstream,from sides toward the central axis of plunge pool bottom.When the deep outlets combined with flood discharge,with the increase of the Q_Um/Q_Us,the distribution of the pulsating pressure along the plunge pool bottom decreases;with the increase of the Q_Dm/Q_Ds,the peak position of the fluctuating pressure appears.The trend of downstream movement.When Q_m/Q_s are the same,the value of the root-mean square of fluctuating pressure increases with the increase of flow rate.（3）The peak distribution law of the root-mean square of the fluctuating pressure of the measured plunge pool in different operating conditions was analyzed,and the optimal gate opening scheme of the deep outlets with different flow rates was established.The study shows that when the up outlets are flooded alone,the peak value of the plunge pool bottom fluctuating pressure is the smallest when Q_m/Q_s=0.7;when the deep outlets are alone,the peak value of the plunge pool bottom fluctuating pressure is the smallest when Q_m/Q_s=1.0.When combined flood discharge,Q_Um/Q_Us=0.7,Q_Dm/Q_Ds=1.25,Q_U/Q_D=0.5 when the plunge pool bottom fluctuating pressure root-mean square peak is the smallest.