Physical Model Test And Numerical Model Test Of Progressive Dam Break Of Tailings Pond

Tailings pond is one of the three control projects in the mine.Its stability is related to the economic benefit of mining enterprises and the safety of life and property of surrounding residents.In recent years,China's tailings pond dam break caused a major accident,which caused great damage to the people around the tailings pond.In China,most tailings ponds are constructed by upstream damming method.With the development of economy,most tailings ponds have large residential areas in the downstream.Taking jiangxi province as an example,among the 62 "overhead reservoirs",51 are located at the mouth of a valley,and the downstream of the tailings dam is an open area with residential areas and large crops.If the dam breaks,it will definitely threaten the lives of the local people and bring huge economic losses.Therefore,it is necessary to simulate dam break of tailings pond with open downstream area in the study of disaster prevention of tailings pond.Tailings in China's present situation,this article is based on YanCang yongping copper mine tailings project,by using the physical model test of the scale of tailings dam,and using numerical model test,the synchronous simulation research work,in order to study the tailings in extreme weather conditions,floods overflow dam failure process,and the process of the evolution of water sand flow after dam and analyze the influence degree of the sand flow to downstream regions open.According to the degree of disaster downstream,the appropriate engineering measures should be selected to protect the downstream residential and planting areas.The research contents of this paper mainly include:(1)through data collection and data analysis,the tailings pond is classified according to the downstream topographical and geomorphic conditions,which can be roughly divided into two categories:deep valley geomorphology and open plain geomorphology.(2)the site construction process of physical test is introduced,which mainly includes the data analysis of the prototype tailings pond,the measurement of the physical parameters of the tailings sand,the making of physical test model,the collection and collection of measurement data,and the working condition design of physical model test and numerical model test.(3)the influence of water and sand flow on the downstream of tailings pond after dam break is systematically analyzed,and the influence of the evolution process of water and sand flow on the downstream of tailings pond after the implementation of engineering measures.The similarity scale used in the physical model test is studied.Analysis of the process line of water level,submerged range,siltation range and regional velocity of dam break.According to the disasters in the experiment,the engineering protection measures are put forward,and the physical model test of tailings pond dam break with engineering protection measures is carried out,and the influence of engineering measures on the evolution of water and sand flow in the open area downstream is analyzed.(4)the flow 3d software was used to conduct 1:1 modeling of yancangwei mine reservoir,to conduct fixed-point observation of the downstream residential area,and set up different monitoring sections to monitor the flow rate and its changes in different areas.On this basis,the overtopping dam break experiment is carried out under the same flood conditions as the physical model experiment.Through the extraction and arrangement of the calculated results,the full-field velocity cloud map of dam break,submerged depth cloud map,influence range of water and sand,water depth and tailing sediment thickness at sensitive points in residential areas,and the change of flow at monitoring section are obtained.Then,in order to reduce the impact of dam break water and sand flow on the downstream region,the impact of engineering protection measures on the downstream region was studied,and compared with the unset protection test group.The following conclusions can be drawn by using two different research methods to study the yancang tailings pond and comparing the test results:Without engineering protection measures,when the building foundation surface of the downstream residential area is lower than 83.78m,it will be affected by the water and sand flow.The lower the terrain,the more serious the impact will be.After the flood recedes,a large amount of tailings will be deposited in the low-lying areas.After protective measures are taken,water flow will affect residential buildings with a foundation surface lower than 83.38m.In addition,the time for the residential area to be affected by the current was delayed by 10 minutes,and the time for the flood peak to reach the residential area was delayed by 30 minutes.