Analysis On The Rule Of The Mine Floor Disturbance Destruction And The Prediction Of The Damage Depth

Coal is the main resource of energy in China,and it provides the solid foundation ofthe energy for the economic development,but as mining goes deeper,the floor waterinvasion threat is more serious.The floor disturbance failure depth is the key parameterson the prediction of the water-irruption possibility,and it is the main control factor of theengineering and measures in the mine water prevention and cure.Therefore, it isnecessary to research the rule of the mine floor disturbance,especially in the mine whichis threated by the floor water damage.In this paper,we have collected and analysised the geological and hydrogeologicalinformation,and selected the right working face;we contrasted the previous monitoringmethods on the coal floor crack development,selecting the ultrasonic monitoring to do alarge number of field monitorings on the floor disturbance failure depth inChaochuan-21090working face,2Mine-23090working face,and applied the specialconstruction-detection lane to monitor the floor disturbance failure depth and theinfluence range which before the mining line in11Mine,and obtained the richdata.First,it was clear from the analysis of the monitoring data that the coal floordisturbance damage depth mainly concentrates in the30m range which below the coalseam floor,the biggest influenced range is nearly40m when the working face along tothe tunneling,and the closer the distance,the greater the damage depth.Second,it wasclear from the comparison of three mine floor disturbance damage depth that the mainfactors of the coal seam floor disturbance damage depth are mining methods,faceplagioclase,impermeable layer thickness,lithologic composition,the depth of the miningand so on.We also contacted the impermeable layer thickness and the damagedepth,using the formula of coefficient of water bursting and concluded that inChaochuan-21090the safety water pressure is2.34Mpa which the floor can bear;in11Mine-22080the safety water pressure is2.94Mpa;in2Mine-23090because thestructural effect is seriously and the cambrian limestone aquifer within the range of thedisturbance destruction,so the water inrush coefficient has no practicalmeaning.Finally,we applied the mathematical principle of multiple-linear regressionanalysis to numerical fitting of the factors about the coal floor disturbance depth,and established a prediction model of the coal floor disturbance depth in Pingdingshanwhere mining No.2₁coal and No.1₄coal coal seam.We contrasted the predictionmodel and monitoring data and proved that the prediction model is reliable andpractical.