Experimental Study On Scour Damage Of Soil-like Bank Slope By Landslides Surge In Reservoir

The geological environment in the mountainous area of our country is complex,Rain Water continues continuously in the Meiyu season,and there are many potential landslides.The bank slope of the mountain reservoir is subjected to water level fluctuation,water immersion and wind and wave erosion all the year round,especially in overcast and rainy weather,earthquake and so on.The reservoir bank is extremely prone to landslides,forming landslide surges.The landslide is extremely disastrous.On the one hand,due to the narrow river course in the mountain area,the landslide is easy to block the river,making the water level of the river as a whole high,and even causing the river to cut off and affect navigation.On the other hand,due to the limitation of the opposite bank slope,the huge kinetic energy of the impact surge caused by the landslide is too late to dissipate,resulting in a great lateral velocity,which can not only overthrow or sink the ships in the water,causing casualties,but also cause damage to the docks,bank marks,renovation buildings and coastal infrastructure construction in the reservoir area when the surge reaches the opposite bank slope.it will impact and scour the bank slope and seriously affect the stability of the bank slope.It even poses a great threat to the lives and property of coastal residents.In this paper,taking the Wanzhou River section of the three Gorges Reservoir area as the research object,the physical model test is used to study the erosion damage of the soil-like bank slope caused by the landslide surge of the three Gorges Reservoir area,and the force of the bank slope and the erosion damage of the bank slope under the action of surge are analyzed.The main results are as follows:(1)A new method for measuring the surface wave pressure of the scoured bank slope is developed,which can measure the surface wave pressure of the bank slope corresponding to the erosion shape of the bank slope without destroying the erosion pattern of the bank slope.(2)Through the physical model test,the dynamic water wave pressure of bank slope under the action of landslide surge is studied,the distribution law of dynamic water wave pressure on bank slope is described,the influence of bank slope angle,landslide volume and wave height on wave pressure is analyzed,and the quantitative relationship among surge factors,bank slope slope and bank slope force is further established.(3)Through the physical model test,the erosion damage of bank slope under the action of landslide and surge is studied,the distribution pattern of erosion damage of bank slope is described,the influence of slope angle,particle size and landslide volume on scour range and scour depth is analyzed,and the quantitative relationship among surge factors,slope slope,particle size and scour depth is further established.