Parallel digging, mining and filling operation coal mining method for controlling overlaying strata fracture and surface subsidence

Abstract

Disclosed is a parallel digging, mining and filling operation coal mining method, in which a stope haulage roadway, stope branch roadways, and two-winged adits are arranged in a stope. The stope haulage roadway and the stope branch roadways serve as haulage passages, and coal mining work is carried out in the two-winged adits. All two-winged adits are mined sequentially and filled timely, and coal mass that has not been mined or two-winged adits that have been filled always exist at the two sides of the two-winged adit that are being mined, to support and control the roof. The two-winged adits can be mined without support or with less supports by controlling the length of the two-winged adits and the number of two-winged adits filled in one time, whereupon pillar-free mining can be realized.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a coal mining method, belongs to the field of coal mining technology, and particularly relates to a parallel digging, mining arid filling operation coal mining method for controlling overlaying strata fracture and surface subsidence.BACKGROUND OF THE INVENTION[0002]Water-preserved mining refers to mining by a reasonable coal mining method and process, so as to ensure the mining disturbance will not cause damage to the water-bearing structure in the water bearing strata; or ensure the water level in the water bearing strata can recover within a certain time period though the water-bearing structure is damaged to some degree and some water loss occurs; or ensure the normal water supply will not be affected and at least the water supply can meet the demand of the ground ecosystem for water resource even though the underground water level can't recover to the original level.[0003]Existing water-preserved mining techniques have...

AI Technical Summary

Benefits of technology

The present invention is a coal mining method that provides benefits such as high recovery ratio, efficient surface subsidence control, and safe and efficient water-preserved coal mining. The method uses stope branch roadways and two-winged adits, which are filled uniformly to minimize sealing walls. The two-winged adits are utilized as roof supports, and the length of the two-winged adits is controlled to eliminate the requirement for supporting. The method also allows for synchronous and coordinated coal mining and filling, attains a high recovery ratio, and achieves a good surface subsidence control effect. Additionally, the method has wide practicability and can realize a high coal recovery ratio and a good surface subsidence control effect.

Problems solved by technology

Existing water-preserved mining techniques have a poor mining ratio, or can't attain a good water preservation effect, or don't have high recovery efficiency owing to the filling method.

Coordinated mining utilizes the counter balancing among surface deformations resulted from simultaneous mining at multiple working faces to attain the purpose of reducing surface deformation, but it involves simultaneous mining at multiple working faces and is constrained by the layout of protected objects on the ground surface; therefore, it has severe impacts on the exploitation design and has limited applicability.

Though these methods can control surface subsidence to some degree, their mining ratios are not high, usually about 50%.

The problems existing in these methods mainly include: difficulties in coordination between coal mining and filling, complex filling system, large filling space, and long filling time, etc.

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