Reform Of Coal Seam Floor And Evaluation Of Grouting Effect

Coal,as the main energy source of China’s production and industrial development,is an important energy support for the rapid development of China’s society.Therefore,coal mining is very important,but with the continuous consumption of coal resources,shallow coal mines can no longer meet the needs of high-speed social development,and people need to dig deeper coal mines.Deep coal mines are more affected by geological conditions.During mining,gas explosions,roadway water inrush,formation collapse and other geological disasters are often encountered.Therefore,it is particularly important to study and solve the geological disasters encountered in these mining.This thesis mainly studies the second largest geological hazard mine flooding problem in coal mining.This thesis takes the working face of the lower part of Kowloon Mine as the research object.Through the analysis of the geological and hydrogeological conditions of the mine,the geological situation of the mine is judged and summarized,and then based on the regional treatment technology of the water inrush coefficient method,the grouting method is used to strengthen and transform the bottom plate of the coal seam,thus reducing the water-richness of the coal seam and forming a relative Waterproof layer to meet the safe mining of coal.In the study of regional control,before mining,the strata were detected and analyzed by using the integrated geophysical method and other detection methods,and the water inrush volume was predicted by using the analogy method,due to the influence of DF15-1 fault and the joint action of ground pressure and water pressure,the primary floor crack expands,and the water in the high confined ordovician Limestone Aquifer passes through the thin limestone aquifer under the lateral recharge working face,which causes the water out of the working face floor crack.Therefore,the data analysis predicted that the ordovician limestone aquifer in the mining process of the maximum vertical water inflow is 3.5 m/min.The data show that the ordovician limestone aquifer is rich in water,and the ordovician Limestone Aquifer t = 0.064MPA/M conforms to the regional regulation standard,but it has great influence on actual mining and needs to be reinforced by floor grouting.According to the mining practice of similar mines nearby,water inrush accidents have occurred,so there is water inrush hazard during actual mining,and it is necessary to carry out floor grouting reinforcement treatment and transformation.Secondly,take this research working face as an example to carry on the region management transformation,the management stratum Austria ash top surface below 19 m ～ 40 m,altogether 15361.65 m(the horizontal section),the grouting quantity 15019 t,through the horizontal drilling exploration has discovered the obvious leakage spot 14.Finally,the grouting effect is evaluated by using fuzzy mathematics and analytic hierarchy process(AHP),and several independent evaluation sub-factors are selected from two main control factors and each main control factor,the evaluation grade of grouting reinforcement effect is excellent,the grouting reinforcement effect is remarkable,and the grouting effect has reached the expected goal.