Three-dimensional Geological Model And Forecasting Of Waterflow Of A Coal Mine In Shanxi

The water flow of the coal mine is an important factor which is a hidden danger for coal mine production and also one of the most common disasters during the coal mining. According to the survey, the proved coal mine reserves as high as509.22hundreds million tons will be threaten by the inrush during exploitation and this part of reserves accounts for27%of the total reserves. Therefore, the analysis of well geologic and hydrogeological conditions are very important and urgent for the forecasting accuracy of the water inrush of the coal mune.Based on the relevant geological and hydrogeological data, according to the characteristics of the stratum and structure, as well as generalizing the lithology of stratum in the study area, the geological model was established by utilizing the groundwater numerical simulation software-GMS. While the petrofabric of water-bearing stratum in the study area, the boundary conditions as well as the source and sink were generalized, through the analysis of the regional hydrogeological characteristics, the recharge, runoff and discharge conditions of groundwater in the study area, then the hydrogeological conceptual model of the study area was built, and based on which, the movement of groundwater in the study area was numerical simulated and the hydrogeological parameters was distinguished and proved combined with the groundwater system structure and movement characteristics.According to the verified numerical model, the water flow of exploitated area was calculated. The results showed that, the main source of water flow during the exploitation of No.11, No.13and No.15coal seam was the Carboniferous carbonate karst fissure water of Taiyuan formation, which had to be dewatered with a water quantity of130m3/h; during the No.15coal seam mining, the maximum water inrush coefficient of the coal seam floor was0.10MPa/m, which should be descended to the critical value0.06MPa/m by dewatering with a water quantity of240m3/h.In summary, the three-dimensional geological model and groundwater numerical model of a coal mine were established by using GMS in this paper, which reflected the situation and trend of stratum in the area clearly. By forecasting the water flow of mine downhole in the study area accurately, a reasonable reference for the mining construction was provided, which was significance to prevent the accidents, reduce the production cost as well as guarantee safe production.