Working face water disaster prevention method for failure of coal mining aquiclude in loess gully region

Abstract

The invention discloses a working face water disaster prevention method for failure of a coal mining aquiclude in a loess gully region. The working face water disaster prevention method for the failure of the coal mining aquiclude in the loess gully region comprises the following steps that firstly, the confluence area F of a threatened gully of a coal face, the area A of the overlapped part of the threatened gully of the coal face and the coal face, the general rainfall intensity H1 in the rainy season in a coal mining area and the maximum rainfall intensity H2 in the rainy season in the coalmining area and related parameters of the threatened gully of the coal face are acquired; by analogy with working faces under similar conditions, the coal face is provided with water pumps; after thecoal face pushes through the threatened gully, an unstable slope produced by gully mining is reinforced, and produced ground fissures are filled with filling materials; a test of permeability of a filled region is carried out on the filled ground fissure region to obtain the permeability coefficient of the filled region; the normal and the maximum water inflow of the coal face in the rainy seasonis tested again; and the drainage capacity is improved, so that the coal face can complete safe mining in the rainy season. The working face water disaster prevention method for the failure of the coal mining aquiclude in the loess gully region has simplicity and easy implementation, more accurate flood prediction and higher safety.

Description

technical field [0001] The invention relates to the intersecting fields of mine hydrogeology, engineering geology and mining engineering, and in particular to a method for preventing and controlling water damage at a working face in which a water-resisting layer fails in coal mining in a loess gully area. Background technique [0002] A large number of coal resources in my country are buried in the loess area, and the loess area has a gully terrain. Atmospheric precipitation in the rainy season of the loess gully terrain is easy to gather to form gully torrents, and the resulting surface torrents pose a water hazard threat to the working face of coal seam mining. At present, in view of this type of water damage, on the one hand, the flood channel is repaired on the surface, and on the other hand, the amount of surface water pouring into the coal mining face needs to be predicted, and the drainage pump volume should be designed according to the predicted water amount, so as t...

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Problems solved by technology

[0004] 1) Although hydraulic engineering has corresponding theoretical prediction methods for channel floods, coal mining has a significant impact on multiple links such as channel flood confluence, flow generation, and influx into mine working faces, and there is a huge gap between the predicted results and the actual situation. Either cause idle pumps in the mine or cause mine water damage

[0005] 2) Mine hydrogeology has a variety of prediction methods for water inrush at the working face, including theory, experience and simulation methods, but there is a lack of prediction of surface floods under the loess gully terrain as the source of water influx into the working face, and the prediction results are also far from the actual huge

[0006] 3) All the methods for predicting the water inflow of coal mining face lack the engineering considerations of backfilling of ground fissures caused by coal mining and reinforcement of disturbed slopes, so there is a huge gap in prediction

[0007] 4) As an important parameter for predicting the influx of water in the coal mining face, the permeability coefficient of the soil layer after backfilling is generally determined by the laboratory test of the filling material, but the degree of backfilling of ground fissures and the stress state of backfilling cannot be ignored for this parameter. The impact of the lack of practical parameters obtained from field tests

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