Hydropower Station Reservoir Area Landslide Surge Disaster Research

Swell with the emergence of the reservoir bank landslide is a kind of secondary disasters, high-speed water entry about the landslide caused a huge surge, surge wave spread to the other side of the form on the climbing a hill, up the downstream transmission wave and climbed up the bank slope formed along the climbing a hill, a serious threat to the reservoir water conservancy project, sailing boats and coastal residents of life and property security, is likely to cause greater disaster than the landslide itself. Swell is the key to the ability to predict surge height, analyze its propagation law, and then to evaluate surge harm to surrounding buildings. Various influence factors of reservoir bank landslide surge height is much and complicated, so far at home and abroad for the surge height calculation, dissemination rule analysis has certain research, most of the calculations are based on certain physical model, numerical model, greatly simplify the variables affecting surge, surge function is too idealistic, scope of application is narrow, selection of calculation parameters are mostly comes from experience. Through physical model experiment, therefore, analyzes the formation mechanism of surge, fitting for a particular channel characteristics of surge related function equations, the study of surge disaster forecasting has important significance. Thesis mainly gets following results:(1). The further study of the hydropower station reservoir deposit of Meilishi 4 # landslide.Meilishi 4 # landslide is located at the upstream hydropower station of 5000 m, distribution elevation 2620 m to 3060 m, relative height of 440 m, the reservoir in the future to 2267 m elevation, is a typical high landslide. Through the adit logging, drilling, logging, surface survey, numerical computation methods such as the stability of the landslide are analysed, the partition of the landslide deformation and destruction and puts forward the landslide instability mode and the corresponding degree of disasters.(2). To study the landslide surge three-dimensional physical model experiment device, experiment method.According to orthogonal experiment design method, developed to embrace the water slide body length, the water slide body width, into the water slide body thickness, slide body into the water velocity, landslides, into the maximum depth of the influence factor of landslide surge experiment scheme. Selection of LanCang river upstream hydropower station 5850 m length segments as the prototype, in comply with the geometric similar dynamic similar, movement similar, and conditions of the premise condition, 1:2000 scale river physical model is established, including large objects grating is studied velometer, polishing board(sliding surface) the experiment control system, with 180 g high-density printed piece of paper, metal shelves, high-speed industrial cameras of the experimental measurement system, carried out for the first largest wave height, wave propagation along the path height, height of surge sensitivity analysis of the experiment.(3). The maximum first wave height of the influencing factors on the sensitivity analysis.Through the sensitivity analysis of single factor experiment, it is concluded that the wave height affect the sensitivity of the factors as follows: the water velocity, the maximum depth of the entry point, into the water slide body thickness, into the water body width, into the water body length. Swell should consider these factors change in study and prediction for the first largest wave height.(4) surge height calculation formula of the hydropower station for LanCang river is proposed.Through orthogonal experiment, the physical model and adopting dimensional analysis and nonlinear regression analysis method for fitting out of the first largest wave height and water speed, the maximum depth of the entry point, into the water, into the water width of the sliding body thickness, the water length, libraries, the surface of the width of the six factors regression equation, spread along the first wave height, wave height and largest river water depth, the propagation distance along the three influencing factors of the regression equation.(5). The calculation method of landslide is introduced into the speed of water and swell calculation formula in common use.Introduces three methods for calculation of the landslide startup, 5 ways to slip into the water velocity calculated, 5 kinds of calculation method of landslide surge height biggest, and using the method of article based on the equation of motion of points for Meilishi 4 # landslide completely instability situation has carried on the detailed calculation, at the same time the state of discrete element software on numerical simulation for calculating landslide entry speed reference.