SU898066A1 - Method of unattended mining of coal beds - Google Patents

Description

I

The invention relates to mining prokesshennost and is intended for deserted excavation of predominantly thin coal seams.

There is a method of excavation of coal seams without the constant presence of people in the bottomhole, including the drilling of wells or the penetration of chambers from the excavation drift, with or without leaving. abandonment of the interwell pillars 1J However, this method is not sufficiently effective due to the significant loss of coal.

There is a method of deserted excavation of coal seams, including drilling from the surface into the coal seam wells, feeding the working agent in the zone to be destroyed along the well, destruction of the coal and issuing it to the surface along the well 2.

However, this method is also characterized by insufficient efficiency.

2

The purpose of the invention is to increase the efficiency of deserted coal seams.

The goal is to achieve that, in the well site, two paired workings are carried out along the dip of the reservoir, the fractured zone is prepared with a split furnace, one of the wells is fed with a flow of compressed air and abrasive material into the fracture zone at an angle to its plane as a working agent. at a speed of 120-150 m / s, and the mineral is delivered to the surface through another well.

FIG. 1 shows a flow chart of the method; in fig. 2 - preparation scheme of the mine floor.

The method is carried out as follows.

Two formations 1 and 2 are made after the dip of the formation. Wells 3 and 4 are drilled from the surface to these outputs to feed and disperse the air mixture at a distance from each other equal to the length of the clearing face, and the clearing face 5 is cut. 2, the dotted line shows the sequence of changing the shape of the line of the clearing slab. Thus, the reservoir is processed on both sides of the preparatory works. At the time of the excavation process, the preparatory works are reliably sealed with compressed air jumpers 6 and 7 from the compressor station 8. pressure of 3-10 kgf / cm sinks into the loading device 9, which feeds the abrasive material into the well 3 and further into the pipeline. In the well and the pipeline, the abrasive material accelerates to a speed of 120150 m / s, a reserve of kinetic energy. This speed is taken on the basis of reliable transportation and a given flow energy. The exit from the pipeline, the flow of the air mixture affects the coal mass and destroys it. Repulsed coal along with the flow of the mixture moves along the line of the clearing slab and further along the mine workings 10 and well 4 into the separator 11.

As the coal mass collapses, the cross-section of the bottomhole space increases, while the flow rate in this area decreases and a part of the material coming from the surface falls out of the flow. The section is again narrowed to the size at which the flow rate ensures the transport of waste rock, after which the subsequent section of the coal massif is destroyed, filling the mined-out space with empty rock.

The proposed method allows to significantly increase the efficiency of deserted coal seams.

Claims (2)

1.Brinko N.K. .0 directions for the development of coal mining technology without the presence of people. - Coal, 1976, № 6, with .. H-15. 2. USSR author's certificate number 617598, cl. E 21 C, 1977