Karst Hydrogeological Characteristics And Drainage Evaluation In Gubei Coal Mine

Mine karst water damage is a prominent disaster problem encountered in the deep mining of North China coalfield in eastern China.Huainan coalfield is an important part of the North China coalfield,the deep Group A coal seam also encountered this problem,which seriously restricts the development and utilization of deep coal resources and threatens the safe mining,exploring the law of the occurrence of deep karst water and evaluating its degree of drainage are the key to solve this problem.Paper is based on the Carboniferous karst water in the lower part of the coal seam of Group A in Gubei Coal Mine and the Ordovician and Cambrian karst water in the deep“high water pressure and rich water”.On the basis of systematically collating hydrogeological exploration data,the results of underground water releasing test are used to analyze the hydrogeological conditions of the mine and south I mining area from the characteristics of karst aqueous medium,groundwater formation conditions and groundwater dynamic characteristics.Focus on the water-rich and permeability characteristics of the karst aquifer from the outcrop area to the deep Taiyuan Formation.A hydrogeological conceptual model and mathematical model of the C₃I limestone karst aquifer in NO.1 coal seam floor were established,and the water releasing test data was used to identify and verify them.Finally,taking the first mining working face of the south I mining area as the research object,taking the safety water inrush coefficient as the constraint,using the identified model,comparing the three different drainage water schemes for the evaluation of the drainage.Therefore,it provides a scientific basis for determining the drainage scheme for the prevention and control of water in the safe mining of Group A coal in the first mining face.Figure[67]table[4]reference[84]...