CS238348B1 - The method of drainage of the aquifer - Google Patents

Abstract

The method of draining an aquifer with an uneven filtration coefficient in the horizontal and vertical directions uses the principle of surface undercutting with the aim of creating secondary cracks in the overburden and in the layer of useful mineral, which change the unfavorable filtration coefficient. Through the secondary cracks, water flows down to the level of the bedrock interface, from where it is pumped out in a known manner by mining works. This allows for the safe extraction of the entire layer capacity with minimal losses, as well as those reserves that were previously left as insulating layers in permanently written-off reserves.

Description

The invention solves a method of dewatering an overburden with an uneven filtration coefficient in the vertical and horizontal directions.

The known methods of draining of overburden overburden utilize a system of hydrogeological drainage wells in advance of mining, which is not sufficiently effective and when extracting a mineral under such overburden, it is always necessary to leave coarse insulating layers of useful minerals to prevent the flow of widds and sedimentary rocks.

The above-mentioned drawbacks are remedied by the method according to the invention, which is characterized in that the thick flat-lined layer of useful mineral with an overburden is deliberately flat-flanked by a flank whose origin is guided at the bottom of the intact mineral-layer over its subsoil. The secondary overburden, as well as the residual layer of useful mineral forming temporary lining insulation, create secondary fissures, by which the water level from the overburden is reduced by gravity to the level of contact of the subsoil with the residual layer of the useful mineral.

The main advantages of the method of dewatering an overburden according to the invention are that it allows, at a low cost compared to the cost of a dense network of hydrogeological wells, more thoroughly to dewater the overburden, and consequently allows the entire mineral mineral layer to be recovered with minimal losses.

The attached drawing shows in section the formation of secondary cracks due to the surface felling of the face, which is led at the level of contact of the subsoil with the utility ηβrast óm.

By subjecting the coarse flat-laid intact mineral layer 1 to the surface, the aquifer overburden 2, and the residual layer% of the useful mineral, are damaged by the pressure of the overlying rocks. The resulting secondary fissures 6 gradually change the uneven filtration coefficient of the overburden in the horizontal and vertical directions, whereby the water from this above bed penetrates the secondary fissures 6 to the level of contact 8 of the subsoil 8 with the residual mineral bed layer 6. % of this level, the water is pumped off in a known manner through the mining works 6 situated in the residual layer 6 of the useful mineral, which are constructed for the purpose of preparation and mining by known theology.

The method of dewatering the overburden / in accordance with the invention can also be used in restoration mining in fields where in the past a utility comb has been mined, leaving several insulating layers, as permanently depreciated reserves considered unrecoverable.

Claims (1)

OBJECT OF THE INVENTION Method of dewatering an overburden with an uneven filtration coefficient in vertical and horizontal direction, characterized in that the coarse planar layer (1) of the utility mineral with an overburden (2) is intentionally flanged with a flange (3), which starts undamaged at the bottom of the mineral layer (1) after its subsoil (4), thereby decreasing the overburden (2) as well as the residual layer (5) of the utility mineral forming a temporary lining insulation. (3) secondary cracks (6) are formed, which reduce the water level (7) from the overburden (2) by gravity to the level of contact (8) with the residual layer (5) of the utility mineral »