Forecast Of Mine Water Inflow Based On MODFLOW

This paper uses the 6163 working face in the southern mining area of Qidong Coal Mine to carry out research,combined with the regional geological data,pumping test data,the division of aquifers and aquifers and the hydrogeological conditions and water-rich characteristics of the Sunan Mine.In the three situations of water filling,indirect water filling,and direct water filling,analytical and numerical methods are used to predict the water inflow from the coal face,The research results are as follows.(1)The large well method is used to predict mine water inflow;when Sihan is used as a direct water-filled water source for mining,the maximum,minimum and average permeability coefficients are calculated corresponding to the maximum,minimum and average water inflow;when the roof sandstone is used as direct water-filling The maximum,minimum and average water influx at the source.The hydrogeological analogy method is used to predict mine water inflow;when the water-conducting fissure zone is not affected by the four sides of the working face without water filling,the maximum water inflow is predicted to be 87 m3/h;when Sihan is used as an indirect water filling source,compare 7114 work The surface water inflow is 191 m3/h;the comparable water inflow from the 3221 working face is 264 m3/h;when Sihan is directly used as the water filling source,the compared water inflow is 1663 m3/h.(2)Through the establishment of numerical simulation of groundwater flow,the magnitude of water inflow from the working face is obtained.This paper divides the working face into 12 sections from the cut-off point.Each section shall be mined for one month,and the influence of time is not considered in each section.Discuss the water inflow under the three conditions respectively.In the water-conducting fissure zone,the Sihananmen and the Sihananmen are not filled with water;at this time,the water source is roof sandstone fissure water,and the maximum average water inflow of the block is 25.8 m3/h.In the water-conducting fissure zone,the Sihanan is not affected by the indirect water filling of the working face of the Sihanan;the average maximum water inflow of the working face block is more than 58.3 m3/h,indicating that the Sihanan as an indirect water filling source provides a better The large water volume makes the water volume of each block no long-term decay trend.In the water-conducting fissure zone,it affects the situation of Sihan and Sihan's working face directly filled with water;Sihan is directly filled with water,and the water inflow from the working face is very large,but the attenuation is weak.The water inflow from the mining face is above 1100 m3/h.Compared with the indirect water-filling layer of the four-bearing coal seam roof sandstone,the fourth-bearing water-bearing level has a significant decrease in the coal seam stop position.Figure 28 Table 20 References 78...