Study On Separation Pillar Setting In Closed Mine And Production Mine

With the excessive consumption of coal resources,many coal mines have entered the period of resource depletion.When a coal mine is closed due to resource depletion,poor economic returns,and government planning needs,special attention should be paid to the safe work of surrounding mines after coal mine closure..For the problem of water inrush caused by the closure of coal mines,two measures of“blocking”and“cutting”are often used.If it is judged that the adjacent mines are shut down and the drainage is stopped after the inspection,the amount of water inflow at the production mine level will be significantly increased.The drainage facilities at the level may be added or the drainage capacity of the main drainage system may be increased to increase the underground water inflow.To eliminate threats.When the significance of adding a drainage system is small,more consideration should be given to measures to block the closure,and the closure of the mine water will be closed to eliminate hidden dangers.Based on the considerations of original rock stress,geological structure,groundwater and mining effects,this paper analyzes the stability of the pillars from the theoretical,calculation,indoor and other aspects of the water in the old empty area after the coal mine is closed.Through the comprehensive research methods such as theoretical analysis of pillar stability and calculation and analysis of pillar stability,the reasonable waterproof width of the pillars in the study area is calculated,and specific waterproof measures are formulated.The main conclusions are as follows:1.Based on the investigation and analysis of Fushan Mining Co.,Ltd.and Huaning Mining Group Co.,Ltd.Baoan coal mine related data.the extent of the impact of mine mining on water damage was analyzed,and the old coal mine goaf area of the Baoan coal mine and the current Baoan coal mine were further investigated.3111 The spatial relationship of the relevant roadway at the working face2.Adopting the relevant fomula of " Coal Mine Water Control Rucles”and the theory of surrounding rock failure plasticity of the roadway,the rock currently retained in the old coal mine goaf area of the Baoan coal mine and the 3111 working face of the current Baoan coal mine after the closure of Fushan Mining Co.,Ltd.The stability of the column was analyzed,and the minimum waterproof rock(coal)column width of the 3111 working face in the old coal mine goaf area of the Baoan coal mine and the current Baoan coal mine was calculated after the closure of the Fushan coal mine.3.It is feasible to carry out full-section filling and grouting scheme for some roadways of the 3111 entering the communication lane of the current Baoan mine.After the Fushan Coal Mine closes and withdraws to stop the drainage,the rock column here can meet the requirements of safe and waterproof isolation rock pillars.