RU1802144C - Method for protection of working from local inrush of rocks - Google Patents

Description

The invention relates to a mining course and can be used in mining in strong1 monolithic rocks with interlayers (gaps) of weak, highly fractured rocks1, prone to peeling and dumping.

The purpose of the invention is to increase the safety of mining during the operation of mine workings in rocks containing local inclusions, prone to peeling and dumping.

Figure 1 shows a diagram for calculating the depth of a niche; figure 2 is a vertical cross section of a mine working up

niches and puffs; Fig. 3 is a vertical cross section through a mine after a niche is formed and puffs are installed.

The method is carried out as follows.

From the mined mine 1 at the intersection with the inclusion of weak fractured rocks, prone to peeling and dumping 2, a niche is designed. To this end, the height of the dihedral angle 3, equal to H 0.5XBXf, where B is the width of the excavation, m; f - coefficient tre00

about

N

no collapsed rock mass on the material of puffs.

The coefficient of friction of collapsed rock mass by the material of puffs is determined on the basis of an experiment performed by the method.

Having determined the height of the dihedral angle, the design contour (depth) of the niche is determined. For this, a distance equal to the maximum size of the inclusion separately is measured from the design contour of the dihedral angle and the walls of the mine. This parameter is based on the condition of free movement of dumps in the space between puffs and exposure of rocks. The dimensions of the inclusion units are determined based on geological surveying surveys.

The rock mass is drilled with bore holes, the blasting of which forms a niche 5 long along the inclusion strike. Metal arches 6 are mounted, puffs 7 are fastened, the planes of which form a dihedral angle with rib 8 along the working axis. From the lower edge of the puffs 9, forming a dihedral angle to the soil, the excavation is fenced with puffs with an unloading device in the form of ice 10, while the height of the unloading device should be not less than the width of the niche. As the rock 11 collapses, it is discharged through the discharge device 10.

. Example p (specific implementation). When driving a mine with a width of 3 m, the inclusion of weak fissured rocks, prone to peeling and dumping, was crossed. Experimentally, using the well-known technique, the coefficient of friction of rocks — no to material (steel – 3) —– puffs equal to 1..2, which corresponds to a friction angle of 50 °, the height of the dihedral angle H 0.5X3X1.2 1.8m.

Using the well-known methodology, it was found that the maximum size of the inclusion structural block is 0.5 m. Thus, the depth of the niche is 0.5 m. The arrangement of the dihedral angle along the working axis, the edge of which is 1.8 m from the working roof, is designed.

niche lines, indent 0.5 m from the walls of the mine and from the planes of the puffs. Drill holes to form a niche with a length equal to the length of the inclusion. Metal arches are mounted to which puffs are fastened in the form of a dihedral angle, the rib of which is located along the working axis. The production is protected from the niche by puffs. An unloading device is arranged at the bottom

in the form of ice. As the niche is filled with collapsed rocks, the latter is removed. The inventive method of fencing the mine from local outfalls prevents the trevation of mining personnel. At the same time, there is no need for expensive and material-intensive lining.

Claims (1)

The claims The method of fencing, excavation from local rock outfalls, including installing metal arches in the excavation, arching these arches and laying sheet puffs between the arches, characterized in that, in order to increase the safety of mining operations during the exploitation of mine workings in rocks containing local inclusions, prone to peeling and dumping, before installing arches along the contour of the mine, form a niche in which puffs are installed, the planes of which form a dihedral angle, the edge of which is located along the axis of the mine on distance from the roof equal to H 0.5 X B X f where f is the coefficient of friction of collapsed rock mass by the material of puffs; B is the width of the excavation, m, while the length of the niche along the strike of the excavation is equal to the length of the inclusion, and the depth is equal to the maximum size of the individual inclusion from the walls of the excavation and from the plane of the puffs, while the niche from the lower edge of the dihedral angle to the soil is protected and an unloading device is installed at its bottom. 4 (rig. 2.