Research On Flow Characteristics Of Dam-break Mortar In Tailings Pond

With the acceleration of urbanization and industrialization,the problem of environmental pollution has become increasingly prominent,and the impact of a large number of engineering construction and resource development on the ecology needs to be resolved.The tailings pond is a man-made dangerous source of debris flow with high potential energy and high pollution.For many years,due to various natural and artificial factors,the tragic accident of the tailings pond dam has occurred,giving the downstream residents life and property safety belts.The huge threats are causing serious pollution to the surrounding environment.The pollution of the environment is irreversible.The damage caused by the dam break of the tailings pond is the most serious,the most widespread and the most costly accident in all mineral accidents.For such low-probability,high-hazard accidents,it is necessary to study the flow characteristics of the tailings reservoir dam slurry.Master the flow characteristics to minimize or avoid hazards.In this paper,based on Gambit software,a physical model is built and imported into the three-dimensional Fluent computational fluid software.Based on the NS equation,the standard k-? turbulence equation is a closed model.The mortar formed by tailings and water liquefaction conforms to the Bingham model in non-Newtonian fluids.The VOF model that can track the free surface in multiphase flow is used for simulation,and the calculation result data is analyzed and analyzed.The paper mainly carries out the following work:(1)Analyze the characteristics of China's tailings pond,and summarize the causes of tailings ponds and dam failures,indicating the necessity of studying tailings pond dam failure.(2)Analyze the applicability of each rheological equation for the mechanism of tailings reservoir dam failure,and summarize the empirical formulas related to dam breakout tailings mortar,and provide theoretical basis for numerical simulation.(3)Using the three-dimensional model of Fluent,combined with the engineering data of a tailings pond in Yunnan,establish a simplified model,carry out simulation calculation,and obtain data for analysis and processing.The submerged range,stacking thickness,venting volume,maximum flow rate and flow rate after dam failure are analyzed.The flow characteristics prove the feasibility and practicability of Fluent software to simulate tailings dam failure.(4)Establish different tailings parameters according to different tailings physical characteristics,analyze the submerged range,stacking thickness,discharge volume,maximum flow rate and flow rate under different parameters to determine the role of parameters in the process of tailings mortar evolution.It is concluded that the plastic viscosity is the amount of the controlled discharge volume,and the roughness is an important parameter for controlling the submerged range and controlling the impact force.