Prediction Of Mine Water Inflow Under Different Mining Schemes For Multilayer Ore Bodies

At present,people’s research on water inflow mainly focuses on the prediction of the first level of water inflow.It will lead to great errors without consideration of the influence of mine drainage in the early stage.Accurately predicting the amount of mine water inflow at each mining level in the mining process is of great significance to the mine production.This paper does following research works in the background of Jiulianshan Iron Mine in Anhui Province.(1)By making full use of the existing exploration data,a three-dimensional geological entity model consistent with the actual stratigraphic information in the mining area is established.Through the display of geological model,the distribution characteristics of ore bodies are more clearly understood.Based on this,two different mining schemes for ore deposits have been set up.Scheme 1:Mining(2)orebody first,then(1)orebody;Scheme 2 order is contrary to Scheme 1;(2)The water inflow is predicted by analytical method and numerical method respectively.The analytical method only predicts the water inflow at the first level of each mining scheme for comparison;Under the influence of pre-mining drainage,the numerical method predicts the water inflow at each mining level.Prediction results show that The water inflow in the first and second stages is respectively 10944 m~3/d、20356m~3/d in the schemes 1;31125m~3/d、8606 m~3/d in the scheme 2.(3)This paper analyzes and compares scheme 1 and 2 from the aspects of water resources protection,the influence of mine water gushing,the design of mine water supply and drainage,economic technology and so on.Mining scheme 1 is more reasonable and can be used as a priority for production units.The paper combines the prediction of water inflow with the mining plan to predict the water yield of mine.Emphasis is laid on the influence of pre-mining drainage on the results.The results provides a reference for the design of mining plan,mining water-draw and utilization assessment,the design of water control measures and the prediction of water inflow of similar mine.