Study On Forecasting Method And Application Of Water Inflow In Inclined Shaft

For the production and construction of coal mine,prediction of shaft water inflow is of vital importance.The prediction method of water inrush wells are many,but for the inclined shaft water inflow calculation,a complete theoretical system is formed,generally used in the existing shaft or drift formula to predict.For the same inclined shaft,two different numerical values of water inflow are obtained by using these two formulas.How to select these two values reasonably is the difficult point in engineering design.The main contents and conclusions of this thesis are as follows:(1)based on the theoretical calculation of shaft and drift existing on the critical angle for inclined previously proposed concept,according to the water level distribution equation and precipitation funnel curve formation conditions,establish the function relation between the critical angle with other parameters,and analyze the main influencing parameters.(2)when the inclined shaft tilt angle is greater than the critical angle,the formation of precipitation funnel curve and the shaft is close,can be based on the theory analysis well method.Based on the analysis of the cross section of the dewatering funnel formed by the inclined shaft and the vertical shaft,a formula for calculating the slope angle of the deviated well is derived.When the tilt angle is 90 degrees,the formula for calculating formula for reduction shaft section of semicircle arch shaped water;when the tilt angle is 0 degrees,inclined shaft cross-sectional area tends to infinity,the theory cannot be accurately calculated.(3)when the inclined shaft angle less than the critical angle,the inclined shaft about two parts can not form the same precipitation funnel curve,theory calculation in law is not applicable to water poured well in the process of.This can be seen as the flat inclined shaft "shaft",different in the calculation method and before the inclined shaft as water resisting floor for gently inclined drift,were analyzed with horizontal corridor formula.When the tiltangle is 0 degrees,to restore the original level corridor formula;when the tilt angle is 90 degrees,the catchment corridor length in theory be infinitesimal,cannot be accurately calculated.(4)hydrogeological data of auxiliary slope of Xue miaotan coal collecting and processing,the tilt angle is less than the actual value according to the critical angle in the calculated values,selection of inclined shaft angle is less than critical angle improved horizontal corridor calculation.The calculated values of the water inflow in the shaft are obtained.The numerical simulation software GMS is used to obtain the simulated values of the water inflow in the inclined shaft,and the results are compared with the actual values obtained from the flow field of the dewatering well.The pan kiln coal mine actual engineering as example analysis,yield improved numerical method of shaft angle greater than the critical angle of large calculation.The research for the inclined shaft at various tilt angles,provides the corresponding theoretical prediction of water inflow,provide a basis for the prevention and treatment of water in the study area,and provide some reference for further study of inclined shaft water inflow forecast problem.