SU1278458A1 - Method of mining minerals in working steep seams in ascending strips - Google Patents

Abstract

The invention relates to the mining industry and improves development efficiency by eliminating the release of oversize. In the method of mining, when mining steep seams, strips for the uprising first carry out ventilation and transport njTpeKn (III). Between 111, boundary wells (C) 3 are conducted. Between C 3, decomposition of C 5 is carried out. Then FIO C 3 passes the coal saw rope and near the soil of the reservoir. the areas of least resistance, obtained in the process of drilling out the softer C, cut through the slit 6. In cases where it is impossible to disaggregate the reservoir at full capacity with POMOP1 of one row of C 3 and 5, additional C 9 is conducted. The smaller C is held in the bedding plane within each excavation strip between the boundary C. Conduction in one piece, their C is carried out with overlapping of the zones of extrusion of the latter. Mineral in the working face of the mine is destroyed in transport (useful pieces and stored in the developed space. A part of the mineral is shipped periodically. 3 Il. Yu 00 4 SP 00

Description

The invention relates to the mining industry and can be used in the development of minerals, mainly steep coal seams.

The purpose of the invention is to improve the development efficiency by eliminating the release of oversize.

Figure 1 presents the scheme of preparation and testing of a steep reservoir; 2 — a formation along strike in the presence of one row of wells; a section; on fig.Z - the same, in the presence of two rows of wells.

The method is carried out as follows.

When preparing a steep coal seam, a ventilation drift 1 is conducted at the upper border of the floor (subfloor), and a transport drift 1 at the elevated border level 2, flanking boreholes 3 are held near the soil of the reservoir, after which the work is carried out from MOHJ, HOCTH reservoir.

On the low-thickness formations in the mineral massif between the flank wells 3 of the withdrawn strip, the soil layer is softened and degassing, and also the clamping saws 4 and well 5, which are located at a distance from one another, are determined by the formula

1 d + 2 1,

where d is the diameter of the well, m;

l is the size of the zone of partial destruction of the mineral from conducting a well along the strike line of the formation, m.

Next, along the flank wells 3 and the clearing face, a rope is passed with a coal saw 4, which cuts a slot 6 in the soil of the reservoir, and the line of least resistance formed in the massif as a result of conducting auxiliary wells provides a constant location of the coal saw 4 in the soil of the reservoir and an increase in cutting speed. As the depleted massif of the mineral is mined in the mined space 7, the coal 8 that has been driven off without oversize is stored, which is partially released from the bottom as it is crushed. After a full hem of the excavation strip, the entire coal store is intensively exhausted, which makes it possible to eliminate the premature collapse of the roof rocks in the removable strip.

In cases where it is impossible to weaken the reservoir to its full capacity using one row of wells, except for wells 3 and 5 located near the reservoir soil with a capacity of more than 2 m, additional wells 9 are located, taking them into account with the overlap of zones of partial destruction. In this case, the total number of rows of wells according to the thickness of the reservoir is determined from the expression

d-i-b

s 0

five

50

0

where w - seam thickness, m;

d - borehole diameter, m;

in - the value of the zone - partial destruction of the mineral above the well at least to the reservoir, is equal to в -, and d is the radius of the bore holes, m; I — magnitude of the zone of partial destruction of the mineral from conducting a well along the LIN-1I strike of the formation, m; t is the weighted average fortress coefficient of the mineral.

After making all wells 3, 5 and 9 on the width of the excavation strip in the weakened array near the reservoir, slit 6 is cut along the line of least resistance. As they are cut, the weakened mineral array in the downhole 7 is destroyed into transportable pieces 8 and stored in the spent space while part of the mineral is periodically shipped. A decrease in the cutting surface resistance of a weakened array eliminates the case of clamps and gusts of the saw 4, and also contributes to an increase in the rate of cutting of the recess strip. After a full hemming of the strip, all of the mapped minerals are intensively released, which makes it possible to eliminate the premature collapse of the roof rocks in the removable strip.

The softening of the mineral array with the use of auxiliary wells 5 and 9 will allow extending the field of application of the method to layers with stronger minerals with medium-resistant roofs.

The reduction of the cutting surface resistance, an increase in the speed of the hemming of the excavation strip and the elimination of blasting to crush oversize allows an increase in the distance between the support pillars 10.

When conducting directional wells 3 and 5 to the entire height of the floor, including in formations with varying angle of incidence, it is possible to avoid intermediate drifts.

Claims (1)

The invention relates to the mining industry and can be used in the development of minerals, mainly steep coal seams. The purpose of the invention is to increase the efficiency of development by eliminating the release of oversize. Figure 1 presents the scheme of preparation and testing of a steep reservoir; 2 — a formation along strike in the presence of one row of wells; a section; on fig.Z - the same, in the presence of two rows of wells. The method is carried out as follows. When preparing a steep coal seam, a ventilation drift 1 is conducted at the upper border of the floor (substage), and a transport 1 track 2 is held at the lower boundary of the reservoir 2. flanking wells 3 are conducted near the soil of the reservoir, after which work is carried out depending on MOHJ , HOCTH reservoir. On the low-thickness formations in the mineral massif between the flank wells 3 of the withdrawn strip from the soil of the reservoir, weakening and smoothing as well as clamping-preventing saws 4 and well 5 are located, at a distance from one another, determined by the formula 1 d + 2 1, where d is the diameter of the well, m; l is the size of the zone of partial destruction of the mineral from conducting a well along the strike line of the reservoir, m. Then, along the flank wells 3 and the downhole, a rope is passed with a coal saw 4 that slits 6 into the soil of the reservoir, with the least resistance line formed in the array as a result of conducting auxiliary wells, provides a constant location of the coal saw 4 on the soil of the formation and an increase in the cutting speed. As the hem of the decomposed massif of the mineral is mined in the mined-out space 7, the coal 8 that has been driven off without oversize is stored, which is partially released from the bottom as it breaks off. After a full hem of the excavation strip, the entire coal store is intensively exhausted, which makes it possible to eliminate the premature collapse of the roof rocks in the removable strip. In cases where it is impossible to weaken the reservoir to its full capacity using one row of wells, except for wells 3 and 5 located near the reservoir soil with a capacity of more than 2 m, additional wells 9 are located, taking them into account with the overlap of zones of partial destruction. In this case, the total number of rows of wells by reservoir thickness is determined from the expression where w is the reservoir thickness, m; d - borehole diameter, m; in - the value of the zone - partial destruction of the mineral above the well at least to the reservoir, is equal to в -, and d is the radius of the bore holes, m; I — magnitude of the zone of partial destruction of the mineral from conducting a well along the LIN-1I strike of the formation, m; t is the weighted average fortress coefficient of the mineral. After carrying out all wells 3, 5 and 9 in the softened massif near the reservoir, the slit 6 is cut through the line of least resistance to the width of the excavation strip. This part of the mineral is periodically shipped. A decrease in the cutting surface resistance of a weakened array eliminates the case of clamps and gusts of the saw 4, and also contributes to an increase in the rate of cutting of the recess strip. After a full hemming of the strip, all of the mapped minerals are intensively released, which makes it possible to eliminate the premature collapse of the roof rocks in the removable strip. The softening of the mineral array with the use of auxiliary wells 5 and 9 will allow extending the field of application of the method to layers with stronger minerals with medium-resistant roofs. Reducing the cutting surface resistance, increasing the speed of cutting of the excavation strip and eliminating blasting to crush non-dimensions allows increasing the distance between the support pillars 10. When conducting directional wells 3 and 5, the entire height of the floor, including in layers with varying angles falls, it is possible to avoid intermediate drifts. Formula of the invention A method of developing mineral resources during the development of steep seams by strips of uprising, including conducting floor drifts, boundary and softening an array of mineral wells, cutting a gap, storing minerals and releasing it, in order to increase the development efficiency due to eliminating the oversized release, the softening of the mineral fossil well massif is carried out in 1 LAYER of bedding within each excavation strip between the boundary wells Azhinami, moreover, the conduction of softening wells carried out with overlapping zones of weakening of the latter, and the slot hole 5533 The soil of the reservoir is planted along the plane of least resistance obtained during the drilling of softening wells. Fmg /