Mine Inflow Research And Groundwater Chemistry Characteristics And Water Quality Analysis: A Case Study On Guqiao Coalmine

Coal mine water disaster is one of the major disasters in China’s coal mining,which restricts the sustainable development of the mine. However, the mine water hasdual natures, and we must pay attention to it as a valuable resource for people livingand production value. Therefore, after mastering mine hydrogeological conditions, theaccurate prediction of mine water inflow has become an important part of theprevention and control of mine water damage. Meanwhile, the effective evaluation ofmine water aquifer is the first part of mine drainage treatment resources and minegroundwater resource utilization.In this paper, we selected Guqiao coal mine as the study area. On the basis of thecollection, collation and analysis of the study area on the hydrogeological conditions,first of all, we used hydrogeological analogy method and gray model to fit and forecastthe mine inflow. We then performed routine chemical analysis of water separately foreach aquifer, and based on ArcGIS, SPSS and other tools we tried to dig waterchemical characteristics and changes in the law of the main aquifer in study area, andtheir internal relations. Finally, we used improved Nemerow methods and elementextension method which were based on Entropy method to determine the index weightto analysis and evaluate the quality of the main water supply aquifers and coalmeasures sandstone aquifer.The conclusions were drawn as following:(1) at present, the mine inflow ofGuqiao mine was stable and mainly production water, followed by the Permiancoal-bearing sandstone fissure water. Hydrogeological analogy method and grayGM(1,1) model can fit and predict water inflow well, and GM(1,1) model can bettermeet the small time scale and accuracy requirements.(2) In Guqiao coal mine, thewater-types of Cenozoic upper aquifer are HCO3-K+Na, HCO3·Cl-K+Na andHCO3-K+Na·Ca·Mg, the main water-types of Cenozoic central and bottom aquifers areCl-Na+K and SO4·Cl-K+Na of brackish; the main water-type of coal measuresaquifers is HCO3·Cl-K+Na.(3)The six ions and TDS indicators of the Cenozoic upperaquifer water are very low and K++Na+can be used as it’s characteristic ions. WhileThe cycling condition is good, and the overall movement of the aquifer is mainlyslowly horizontal from the northwest to the southeast. The coal measure aquifers arelow water-richness, poor water flow and high salinity. While Ca2+and Mg2+can be used as the characteristic ions. The coal measure aquifer water of the B11and C13seams,which are main mined, mainly exhibits the normal coal measure water characteristics.However, the contents of Ca2+and Mg2+of coal measure water of C13seam are higher.(4) The water quality of Cenozoic upper aquifer in Guqiao mine was relatively goodwith water mainly Ⅱ water which could meet basic life and production requirements.The overall water quality conditions of the lower aquifer and coal measures water wasworse and was mainly IV and V class-based water. We should do grading treatmentand discharge well when we did emissions and use on different purposes.