Reseach On Height Of Water-conducting Fracture Zone And Predicting Mine Water Inflow In Northeast Binchang Mining Area

Accurate prediction of the Height of water-conducting fracture zone and mine water inflow is a difficult problem in the field of mine water prevention and control.In this paper,taking Wenjiapo and Hujiahe coal mines in the northeast of Binchang mining area as the study area,the developm,ent height of water-conducting fracture zone in No.4 coal seam mining is analyzed and the prediction method of mine water inflow is studied,which has import.ant practical application value for mine water prevention and control workOn the basis of fully collecting the geological data of the study area,the statistical analysis method is used to analyze the development characteristics,engineering geological characteristics and hydrogeological characteristics of the thick sandstone aquifer in the Luohe Formation of the study area.It is no longer divided into upper and lower sections,but is considered as a unified aquifer.By using the method of field observation and numerical simulation,it is c.oncluded that under the condition of 3.8m mining thickness in 4103 working face of Wenjiapo Coal Mine,the development height of water flowiing fracture zone is 180m the ratio of water flowing fracture zone to mining thickness is 47.7times,and the failure height of overlying bedrock is developed to the bottom of Luohe formation aquifer.When the thickness of 402113 working face in Hujiahe Coal Mine is 15m,the development high of water flowing fracture zone is 243m,and the fracture-mining ratio is 16.2 times.Due to the large mining thickness,the failure height of overlying rock has reached the middle of Luohe formation aquifer,Based on the Pearson correlation analysis of the measured data of the water diversion fracture zone in Binchang mining area,the correlation between the height of the water diversion fracture zone and the mining thickness and width of the working face is obtained,and the formula for calculating the crack-mining ratio under the conditions of different mining thickness and width of the working face in the study area is fitted.According to the development of highly conductive aquifers in the water flowing fracture zone in the area,using the principle of hydrogeology,the hydrogeological model in the study area is generalized into two parts:Yan'an formation and Zhiluo formation aquifer of "complete well" influent model,Yijun formation and Luohe formation sandstone super thick aquifer of "incomplete well" influent model,"large well method" and Darcy's law are selected to optimize the calculation method of water inflow.It is proved that the optimized calculation method of water inflow in this paper is closer to the measured value of water inflow than the conventional "large well method" and "simulation method",and the errors are 7.03%and 9.4%,respectively.The research results provide some reference for the prevention and control of water in the study area and mines with similar conditions.