Method for predicting water inflow of underground coal mine inclined drainage drill hole

Abstract

The invention discloses a method for predicting the water inflow of an underground coal mine upward inclined drainage drill hole. The method comprises the following steps: 1, determining a mathematical model of movement of underground water of an aquifer towards the upward inclined drill hole; 2, determining the simulation range and simulation boundary processing of the numerical model; 3, constructing and discretizing a composite numerical model of the hydrophobic aquifer and the inclined borehole; 4, generalizing the hole wall of the inclined drill hole into a seepage overflow boundary, andperforming simulating based on a definition method of a definite solution condition based on a seepage overflow condition so as to be closer to a real seepage field; 5, inputting a hydrophobic aquiferinto the numerical model according to the field measured data; 6, carrying out real-time integration on the Darcy flow velocity of the hole wall of the drainage drill hole, and dynamically calculating the dynamic water inflow of the upward inclined drainage drill hole; therefore, on the basis of the unstable seepage motion model of the underground water, a finite element model method is adopted,dynamic numerical prediction is carried out on the coal mine upward inclined drainage drill hole water gushing process, and dynamic calculation of the coal mine underground upward inclined drainage drill hole water gushing amount is achieved.

Description

technical field [0001] The invention relates to the technical field of mine water prevention and protection of underground water resources, in particular to a method for predicting the water inflow of inclined drainage boreholes in coal mines. Background technique [0002] With the goal of safety before the coal mining face of the underground coal mine is mined, drain holes are constructed underground to the roof aquifer, and the groundwater in the (dry) aquifer is pre-drained to reduce the intensity of roof water inrush during the coal mining process, which is the roof water hazard. main means of governance. like Figure 1A and Figure 1B As shown, the underground drainage boreholes in coal mines generally go upward through the coal seam from the opening of the roadway and enter the roof aquifer (abbreviated as: upward-inclined drilling). Water inflow generally consists of the static storage Qs of the aquifer and the dynamic recharge Qd. With the prolongation of the drain...

AI Technical Summary

Problems solved by technology

Although the "Manual of the Chief Engineer of Coal Mine" gives an empirical formula for the water inflow of a single hole in the underground exploration and release of the old empty water body, the formula is derived based on the Bernoulli equation in fluid mechanics, assuming that the water level is constant and the orifice flow rate is Deduced under constant conditions, it is suitable for predicting the water inflow of drilling boreholes under the condition that the water filling water source is surface water and old empty water. The expected water inflow

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