Strip type working face filling mining method

Abstract

The embodiment of the invention provides a broken-line-shaped ventilation strip type working face filling mining method which comprises the following steps that (1) a transportation crossheading, an air return crossheading and an open-off cut are excavated to form a working face to be mined and a U-shaped ventilation channel, the working face to be mined comprises N mining areas, and N is an integer larger than or equal to 2; 2) tunneling the first mining area according to a strip type coal mining method and forming a first unfilled strip, a first coal pillar, a second unfilled strip, a second coal pillar and a first communication channel; (3) the conveying gate road, the cut hole, one part of the air return gate road, the first unfilled strip, the first communication channel, the second unfilled strip and the other part of the air return gate road are sequentially connected so as to form a ventilation channel; and 4) repeating the step 2) to the step 3) to form a new ventilation channel.Therefore, the strip type working face filling mining method has the advantages of high safety, simple and convenient equipment and convenience in operation.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a strip-type working face filling and mining method with zigzag ventilation. Background technique [0002] The strip filling mining of the longwall working face can prevent surface subsidence and prevent the movement of rock formations caused by mining from damaging the protected objects such as water bodies and buildings on the surface. Ventilation passages in longwall working face strip filling mining play an important role in mining safety and reliability. [0003] In related technologies, the air ducts formed during the strip filling mining of the longwall working face mainly include strip parallel ventilation channels and closed strip ventilation channels. When the strip parallel ventilation method is used to mine the strip filling mining face, the unfilled strip will disperse the fresh air volume entering from the groove to each strip, so that the air volume in each st...

AI Technical Summary

Problems solved by technology

When the strip parallel ventilation method is used to mine the strip filling mining face, the unfilled strip will disperse the fresh air volume entering from the groove to each strip, so that the air volume in each strip is insufficient, and the air volume in the strip is insufficient. The scattered leftover coal is not completely oxidized, and the heat accumulates, which is easy to cause spontaneous combustion and pose a safety hazard

At the same time, the parallel ventilation of the unfilled strips has been penetrated, and the length of the ventilation routes is different, forming a relatively complex ventilation network. The air distribution volume of each strip needs to be strictly calculated, and the ventilation adjustment device is required to accurately control the air, which is difficult to adjust and difficult to adapt to the conditions. The dynamic change of the continuous formation and continuous filling of the belt

However, when the closed strip ventilation channel is used to mine the strip working face, the coal wall in the unfilled strip is exposed, and the gas gradually escapes into the air in the strip, resulting in gas accumulation or exceeding the limit.

When unsealing before filling, it is necessary to take special measures to exhaust the accumulated gas. The operation is difficult, the operation requirements are high, and there are potential safety hazards, which will affect the normal operation of the nearby mining filling system.

Images