The Prediction Of Water Yield Of Main Inclined Shaft In Dahaize Mine

Yuyang District is located in middle of Yulin city, the territory of which is vast, and it also has abundant resources of coal. As an important source of heat energy, coal plays a leading role in the energy structure of our country. However, accidents of coal have been a great hidden danger in the process of coal construction, especially the mine gushing water accident, which has seriously restricted the development of mineral resources and the relevant industries. Once the accidents happen, it can bring huge economic losses to coal mines, and even casualties.The prediction of water yield of shaft, as an important and complex work, refers to the water of flowing into the shaft per unit time in the process of shaft construction. According to the prediction, design and construction department can choose reasonable plan. Therefore, accurately predicting water yield of shaft is of great importance for reducing and avoiding mine accidents.In this paper, a few methods of prediction of water yield of shaft were studied. Through contrastive analysis, the numerical simulation was finally selected as the study method. Based on the geologic exploration report,regional coalfield geological exploration data, construction plan of main inclined shaft,hydrogeological conditions and weather data, the model range, initial conditions,boundary conditions and hydrogeological parameters were ensured, the theoretical foundation of which is groundwater dynamics, so as to set up the three-dimensional hydrogeological model. According to the construction progress, the boundary and parameters of main inclined shaft were properly set. Changes of water yield in construction process was simulated: in the total simulation period,the beginning water yield was 98.95m3/d, maximum water yield was 17509.01m3/d, final water yield was 6627.31m3/d; while the main inclined shaft cross cretaceous aquifer, the beginning water yield was 98.95m3/d, maximum water yield was 10525.0m3/d, final water yield was 9472.6m3/d; while the main inclined shaft cross jurassic aquifer above the 2# coal seam, the beginning water yield was 669.3m3/d, maximum water yield was 6661.6m3/d, final water yield was 6654.9m3/d; while the main inclined shaft cross the 2# coal seam, the beginning water yield was 115.37m3/d, final water yield was 43.91m3/d; while the main inclined shaft cross the 2# coal seam, the beginning water yield was 1298.6m3/d, maximum water yield was 1298.6m3/d, final water yield was 455.9m3/d. Moreover, with the development of construction progress, the falling range of groundwater level was bigger and bigger, besides the direction of main inclined shaft,cone of depression was also developed along with the two sides. Based on the change of groundwater seepage field, effect of groundwater environment was analyzed.