Groundwater Dynamic Variation And Evaluation Of Drainage From Taiyuan Limestone Aquifer In Paner Coal Mine

The geological structure of Panxie mining area is very well developed,which not only plays an important role in controlling the occurrence and migration of groundwater,but also increases the risk of water inrush from limestone in group A coal mining floor.In addition to the difference of water content in limestone karst fissure aquifer at the bottom of the coal mining process in Group A,It is to ensure the safe mining of group A coal through the dynamic variation characteristics of limestone water flow field and the evaluation of its sparsity can be thoroughly analyzed,and the drainage scheme of limestone aquifer can be formulated scientifically.Taking Paner Coal Mine as an example,this paper analyzes the hydrogeological conditions,spatial and temporal variation of aquifer water level,water quality variation,water temperature gradient and water inrush change by systemically sorting out the relevant data of geological structure and hydrogeology in the study area.The water bearing layer of group C₃?limestone at the bottom of group A is numerically simulated and analyzed by using Visual MODFLOW software,and the drainage performance of limestone water from group A at the bottom of group A is evaluated in Dongyi mining area.The following results have been obtained:?1?In time:the mining degree has little influence on the Cenozoic aquifer and stable water level,but it has a great influence on the limestone aquifer,and the overall trend is decreasing.In space:limestone water flows from southeast to northwest,and an obvious drop funnel is formed in the central part.The range of water level variation is the same,and the change range of Ordovician limestone aquifer water level is smaller than that of Taiyuan limestone aquifer water level.?2?In the study area,K⁺+Na⁺and HCO₃^-,Cl^-are the main anions in the groundwater.The main types of hydrochemical type are HCO₃-Ca·K+Na type and Cl-K+Na type,among which SO₄·HCO₃·Cl-K+Na type and SO₄·Cl-K+Na type only also exist in limestone aquifer.The similarity about the formation of ion components in groundwater,and there is interoperability among the aquifers.?3?It is normal in the Cenozoic in Paner mine about the groundwater temperature.but it is quite different in coal sandstone water,the water temperature in some areas is higher,and it is close to the water temperature in limestone aquifer.?4?The initial change of mine water inrush was small,but the fluctuation was obvious,and the overall trend was increasing.?5?Combined with the above analysis and related data,numerical simulation analysis is carried out on the C₃?limestone aquifer of Group A coal floor.After identification and verification,the relevant hydrogeological parameters are obtained,and the dynamic change map of groundwater flow field of underground limestone is obtained,which is consistent with the change of actual water level,which provides a basis for studying the sparsity of Taiyuan limestone aquifer.?6?Taking Dongyi mining area as an example,this paper uses the theory of"water inrush coefficient"to calculate and analyze the limestone water of group A before and after drainage.The results show that the dredging effect is better,and the relevant prevention and control measures of limestone water are given.Figure[66]table[17]reference[68]...