| With the construction of water conservancy projects,many large reservoirs appear in the main stream of rivers.Secondary surge of landslide can travel a long distance and threaten the operation of the hub and the safety of downstream personnel and property,so it is necessary to study the landslide disaster of reservoir.In this paper,by means of model test and numerical calculation,the characteristics,propagation and dissipation law of surge caused by partial instability of deformed body on Guobu bank slope are studied,and the feasibility and economy of surge risk and corresponding reduction measures are analyzed.The main research contents and conclusions are as follows:(1)A large scale physical model is established to study the height and wave overcrossing risk of surge in the reservoir area,river channel and dam front area caused by different volume,different entry speed,different shape,whole or split way of slide block entering water.It is found that among many factors affecting the surge characteristics,the impact degree is different between the occurrence area and the dam front area,and the volume of the slide block,the water entry mode(integral/split),and the shape of the slide block have a relatively large impact on the surge height,the water entry Angle of the slide block,the water entry speed has a relatively small impact on the surge height in the dam front area.;(2)Most of the maximum wave height in the water area in front of the dam occurs at the shoulder of the dam body,and the most serious wave height is at the shoulder of the dam body on the right bank.Under dynamic conditions,surge waves splash on the dam surface in a large range and exceed the dam roof;Under the separate water entry condition and static condition,the splashing situation is weakened,the surge climbs seriously on the bank slope,and a large amount of water flows downstream over the top of the gate of the surface hole.The total water flow over the dam at the shoulder of the dam body accounts for about 5% of the total water flow over the dam,and about 95% of the water flow from the top of the gate to the downstream;(3)The flow-3D numerical model was established and its reliability was verified,and the influence of the sliding block entry Angle and the sliding block body shape on the surge characteristics was added.Based on the results of model test and numerical calculation,the empirical formula of wave height suitable for special position is summarized,and the characteristics of surge wave and its effect on dam body are analyzed.(4)With the aid of numerical simulation,the water surface anti-wave wall in the reservoir area,the deep-water anti-wave wall in the reservoir area,the grid plate in the water area in front of the dam,the wave-dissipating structure at the shoulder position of the dam,and the anti-wave wall at the top of the dam were analyzed,and then the model test focused on the effect of adjusting the anti-wave wall type of the dam roof to curb the waves,and the results showed that the heightened anti-wave wall can play a significant role in curbing the water flow and overturning the dam. |
