Study On Calculation Method Of Bank Landslide Surge

Due to the increased scale of water conservancy projects in the reservoir area,activities such as reservoir construction and water storage will transform the geological environment and hydrological conditions in the reservoir area,and various forms of geological evolution will accelerate.There are often a lot of dangerous rocks on the reservoir bank.Once the dangerous rocks collapse into the water,it will cause swells and pose a great threat to the lives,buildings and waterways of the residents around the reservoir area.The problems related to the surge in the reservoir area have become the key research object of many scholars.At present,the domestic and foreign scholars’ theoretical research on the calculation method of swell surges in the reservoir bank is mainly aimed at landslide surges,and the empirical formula is obtained through the overall analysis of the sliding body into the water.The landslide surge of the reservoir bank is caused by the continuous influx of countless monolithic rock and sand mixtures.Therefore,the research on the surge of the monolithic rock collapse body can provide a theoretical basis for the study of the reservoir bank slope collapse and landslide surge.In this paper,based on the single dangerous rock,considering the shape and size of the dangerous rock,the water inlet speed,angle,and the direction of the speed during the water inlet process,the theoretical derivation method is used to study the law and influencing factors of the bank bank collapse and surge process It is of great significance for the prevention of surge disasters in the reservoir area and the construction of related prevention projects.In this paper,the theoretical derivation and numerical simulation are combined to study the height of the surge caused by the ideal dangerous rock ball entering the water with horizontal velocity.Through the study of the trajectory of the collapse of the dangerous rock,the rolling motion is taken as an example to analyze the movement characteristics of the dangerous rock before entering the water.In the theoretical derivation,through the previous research on the surge in the reservoir area,the characteristics of the single dangerous rock into the water surge were discussed,and the influence of the angle,velocity and volume of the dangerous rock collapse on the surge height was analyzed.Aiming at the ideal dangerous rock ball,the physical model of the influent surge wave of dangerous rock is established to study the difference of the influent surge height in all directions under the condition of horizontal velocity.The calculation method of the maximum surge height of the dangerous rock ball into the water in all directions is derived.In the numerical model,a three-dimensional numerical model based on the method of tracking the free surface is established.After determining the software parameter settings and the correctness of the selection method,the calculation results of the theoretical calculation method are verified and the final results are visualized.The research results are as follows:1.Sort out the current calculation method of surge and analyze the characteristics of dangerous rock surge through landslide surge.2.Combined with the landslide surge,the effects of the volume of dangerous rock,water inlet velocity and water inlet angle on the single wave surge of dangerous rock are analyzed,and this is used as the calculation parameter of the height of the surge wave under the condition of angle inflow of the single rock in the reservoir bank.3.Proposed two swell stages of reservoir bank collapse surge wave intrusion squeeze wave and drainage return wave,and theoretical derivation.4.Simulate the surge phenomenon of the physical model in this paper through FLOW-3D to verify the correctness of the calculation method.