Hydrochemical characteristics and evolution laws of karst water in Buliangou mine field
Karst water damage is one of the major hidden hazards in the safety production of Jungar coalfield.Based on the analysis of hydrogeological conditions in the northeastern part of the Jungar coalfield,the hydrogeological geochemical and mathematical statistical methods were applied to identify the water chemistry characteristics and evolution laws in the study area and provide a scientific basis for mine water damage management.The results show thated:①The pH of karst groundwater in the study area was ranging from 7.5 to 8.35,which was weak alkaline to slightly alkaline.TDS was less than 1 000 mg/L,and the whole was fresh water.The karst water chem-ical types included HCO3-Na·Ca·Mg type water,HCO3·Cl-Na·Ca type water and Cl-Na typewater.The main anions and cations in karst water were Na+,Ca2+,HCO3-,Cl-and SO2-.②The water chemistry components of karst groundwater were mainly influenced by water rock interaction and cation exchange and adsorption.The main sources of Na+and Cl-could either be major from halite dissolu-tion or cation exchange.The main sources of Ca2+,Mg2+and HCO3 were mainly from the dissolution of calcite and dolomite.SO42-came mostly from gypsum dissolution and pyrite oxidation.③The inverse hydrogeochemical simulation showed that the main hydromete-or effects occurring along the direction of karst groundwater runoff include precipitation and dissolution of calcite and dolomite,dissolu-tion of gypsum,halite and CO2,and Na-Ca cation exchange.
万方数据
维普
