Long-wall overlying strata settlement coordination water-preserving coal mining method

Abstract

The invention discloses a long-wall overlying strata settlement coordination water-preserving coal mining method. The method comprises the following steps: I, partitioning a mining area and a working face; II, determining a working face coal mining method as the long-wall overlying strata settlement coordination water-preserving coal mining method, namely propelling by length L to form a first strip, reserving a filling coal pillar being D1 in the width, propelling by length L at another place to form a second strip, and reserving a support coal pillar being D2 in the width, wherein an area between two adjacent support coal pillars is taken as a settlement coordination area; III, determining mining parameters of the long-wall overlying strata settlement coordination water-preserving coal mining method, namely 301, determining the length L' of the settlement coordination area, 302, determining a strip propelling length L, 303, determining the width D2 of each support coal pillar, and 304, determining the width D1 of the filling coal pillar; and IV, mining on the working face. The coal mining method is simple and convenient to implement. The coal recovery ratio is increased greatly, rich water resources in mining areas with water shortage are protected, ecological environments of the mining areas are prevented from being damaged, and thus the coal mining method is high in practicability.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a coal mining method for coordinated settlement and water conservation of longwall overlying rock. Background technique [0002] Yushenfu Coalfield is located in the border area of ​​the arid and semi-arid Mu Us Desert and the Loess Plateau, with poor water resources, barren land, sparse vegetation and fragile ecological environment. The environmental quality in the natural state shows a downward trend, and the large-scale development of the coal industry has accelerated this trend in this area. The phreatic water existing in the Salawusu Formation in the coalfield plays a key role in the local ecological environment, and because the coal seam is buried shallowly, the mining damage will immediately spread to the bedrock surface and the surface, thereby seriously destroying the phreatic water, resulting in a sharp drop in the water level. Plants withered, crops di...

AI Technical Summary

Problems solved by technology

The mine used the room-and-pillar mining method in the past. The mining technology of the room-and-pillar mining method is backward, frequent relocation, large coal pillars, waste of coal resources, and high economic benefits cannot be obtained.

Then it was changed to ordinary strip mining. Although the purpose of water conservation has been achieved, the recovery rate of coal has been limited, and the waste of resources is serious.

However, the continuous mining practice of the longwall working face in the nearby mining area has proved that the overlying rock damage will immediately spread to the bedrock surface and the surface, thereby seriously damaging the diving, leading to a sharp drop in water level and underground water gushing accidents, resulting in the deterioration of the ecological environment of the mining area and the threat of floods

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