Semenenko E. The development of scientific foundation of hydromechanization for quarry operation of gravel deposits

Subject of inquiry - processes of hydromechanization for quarry operation of gravel deposits, which are accompanied by displacement of granular materials in hydraulic way. The aim of the work is the development of scientific foundation of hydromechanization for quarry operation of gravel deposits by taking into account patterns of relationship for mechanical processes that take place during pulpation and hydrotransportation of polydisperse materials with particles of different density at the regimes with steady-state pulsations of pulp pressure and discharge for power-consuming and water demand minimization of hydromechanization technologies. The multimeter method that includes analysis and summarizing of well-known investigations results, numerical solution methods of nonlinear equations and mathematical simulation methods was used in the work. Bernoulli equation for slurry flow was used during elaboration of the procedure of calculation of hydraulic gradient and condition that confines turbulent tangential stresses on a pipeline surface was used when determining critical velocity. Solution of the system of equations for fluid unsteady flow in the pipeline taking into account changing of impeller pump adjectives under discharge oscillation was used during evaluation of variation intervals of running regime characteristics of hydrotransport plant. Theory of elasticity and membrane theory of thin shells as well as dependencies for calculation of speed of disturbance propagation in pipelines and for rise of pressure under hydraulic hammer were used during definition of mathematical model of radial oscillations of pipeline with ice inner ply and elaboration of the procedure of evaluation of pipeline strength. Determination of uplift ultimate height of particles was realized in terms of Chen equation with using of semiempirical turbulence theories. The method of calculation of hydraulic gradient and critical velocity during hydrotransportation of polydisperse placers and ores with particles of different density as well as estimation procedure of variation interval of these parameters at the regime with steady-state pulsations of pulp pressure and discharge are elaborated, the method of calculation of hydrotransport plants parameters and operating regimes when handling them by changing of rotation frequency of pump impeller as well as constraint onto parameters and operating regimes from the direction of the pumping unit and main pipeline are grounded. The model of water supply system of open pit hydrotransport complex and model of pulpation process when using hydraulic monitors for mountain mass washout are elaborated. In terms of elaborated models the methodical support of calculation of water supply system parameters and operating regimes of open pit hydrotransport complex is elaborated. The set of elaborated calculation procedures, which allow the significant rising of accuracy of calculation of parameters and operating regimes of pipeline systems for placers and ores hydrotransportation, was introduced into industry and also into scientific investigations and development effort practice.