RU2083827C1 - Method for development of mineral seam formations - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: method can be used in underground development of formations of adjacent seams of minerals at large depths. According to method, seams are divided into panels, main preparatory entries are cut through lower lying seam or in rock of its foot, panels are worked out in lower lying seam in descending, and panels in upper lying seam are worked out in rising. One of wings in panel of upper lying seam is worked out with advance. Main preparatory entries are finished, and left in worked-out area of above lying seam is pillar of mineral. Given in description are parameters of stoppages for above lying seam. EFFECT: high efficiency. 2 dwg

Description

 The invention relates to mining and can be used in the development of mineral strata, mainly coal, at great depths.

 Known methods for developing a suite of mineral strata, including dividing the mine field into horizons, dividing the horizons according to the dip and strike of the strata on the panel, conducting for each stratum within the panels the main preparatory workings (slopes, slope walkers) and working out the panels for the fall, starting from the top tiers [1] The disadvantages of these methods are large losses of minerals and significant costs for maintaining the main preparatory workings in the development of suites of closely connected seams on Olsha depths.

There is a method of developing a suite of mineral strata, including dividing the mine field into horizons, dividing the horizons by dip and strike on the panel, conducting group main preparatory workings along one of the strata and practicing panels by dip of the reservoir, starting from the upper tiers [2]
The disadvantages of the known methods are the significant costs of maintaining the main preparatory workings, large losses of minerals in the pillars left to protect the main preparatory workings, and the low efficiency of treatment in sections of the panels adjacent to the main preparatory workings in the development of suites of close seams at great depths.

 The aim of the proposed method is to eliminate these disadvantages in the development of suites of closely related layers at great depths.

 To achieve this goal, the main preparatory workings of the panels (slopes, slope walkers) pass only along the lower layer or in the soil rocks of the lower layer, the panel of the lower layer is worked out in a descending order, starting from the upper tiers. The panel of the upstream reservoir is worked out in an ascending order, starting from the lower tiers, after the completion of treatment work in the panel of the downstream reservoir.

When mining the upstream reservoir, one of the sides from the developed main preparatory workings leaves the whole mineral, the long side of which is oriented parallel to the axes of the main preparatory workings. To do this, the tiers in the panel of the upstream reservoir are mined ahead of the treatment work in one of the wings of the panel, while the main preparatory workings are developed. Mining production faces are stopped when they move away from the main preparatory workings by a distance exceeding 0.7 distances from the upstream formation to the main preparatory workings. Clearing faces in the wing of the panel, worked off with a lag, stop when they approach the nearest main preparatory workings at a distance, the value of which is determined from the expression
S≥Z _pr + 0,7h, (1)
where Z _{pr the} maximum width of the pillar, with a decrease in which there is an increase in the intensity of collapse of the roof rocks in the lavas of the wing of the panel, worked off with a lag;
h the distance from the upstream formation to the main preparatory workings.

The essence of the proposed method is illustrated by figures 1 and 2 of the schemes. In FIG. 1 and 2: m ₁ downstream formation; m ₂ - upstream layer; ABNM, EKLE panels located within the first horizon; ABNM panel upstream m ₂ ; EKLE panels on the lower layer m ₁ ; QAMP and TFEO panels of the second horizon, respectively, in the layers m ₁ and m ₂ ; 11,12,13 main preparatory workings (usually 11, 13 walkers, 12 panel bias); Z is the width of the pillar left when mining the upstream reservoir; a the distance between the stopping place of the working treatment faces (lava N 1) and the main preparatory workings S the distance between the stopping place of treatment work in the lavas of the wings of longlines worked off behind (lava N 2) and the nearest main preparatory mine 11; ABCD panel wing, worked off with a lag; 1 _n , 2 _n , 3 _n , 4 _n , 5 _n tiers of the panel of the underlying reservoir (the first is 1 _n , then 2 _n , etc.); 6 _in , 7 _in , 8 _in , 9 _in , 10 _{in the} tiers of the panel of the upstream reservoir (the first work out 6 _in , then 7 _in , etc.); H ₁ - size of the fall of the second horizon.

In FIG. 2 depicts the following mining situation. The treatment works on the downstream stratum m ₁ have been completed, mining of minerals by lava N 1 in the right wing of tier 9 _{in the} upstream stratum m ₂ is being carried out. Below tier 9 _, the formation of a mineral pillar of width Z is completed.

A cleaning recess in the left wing of the tier ₉ (Chapter N 2) are with a lag of sewage treatment works in the right wing of the tier _9. After the lava N 1 stops, the formation of the pillar is completed by the Lava N 2. Such an organization of work in combination with the ascending order of mining the panel of the upper layer and the fulfillment of condition (I) allows us to achieve the goal, i.e. reduce the loss of minerals in the pillars (by reducing their width), reduce the cost of maintaining the workings 11,12,13.

 Compliance with condition (I) allows you to get these effects without compromising the technical and economic indicators of treatment in the wing of the panel ABCD, worked off with a lag.

 Implementation at the time of completion of mining reserves of the first horizon of the scheme shown in Figure 1, allows you to unload for a long time the area of the array in which the main preparatory workings 11,12,13 are located, and therefore, reduce maintenance costs when using these workings for mining second horizon (QAMP and TFEO panels).

The maximum width of the pillar (Z _CR ), with a decrease in which there is an increase in the intensity of roof collapse in the lavas of the wing of the panel, worked off with a lag, can be determined for specific conditions by mine, laboratory or analytical studies.

 The area of use of the recommended method is mines developing suites of adjacent layers at depths of more than 500-600 m.

Claims (1)

A method of developing a suite of mineral strata, including dividing the mine field by the dip of the formation on the panel, conducting the main preparatory workings and sequential mining of the panels, characterized in that the main preparatory workings are carried out on the downstream formation or in the rocks of its soil, the panels of the downstream formation are worked out in a descending order after which they work out in an ascending order the panels of an upstream formation ahead of the treatment work in one of the panel wings and the overwork of the main preparatory workings, at the same time, they form the whole, stopping the working workouts when they move away from the main preparatory workings by a distance exceeding 0.7 of the distance from the upstream formation to the main preparatory workings, and the work faces in the wing of the panel, processed with a lag, when approaching them to the main preparatory workings at a distance determined from the ratio
S ≥ Z _{p p} + 0.7 • h,
where Z _{p p is the} maximum width of the pillar, with a decrease in which there is an increase in the intensity of caving of roof rocks in the lavas of the wing of the panel, worked off with a lag;
h the distance from the upstream formation to the main preparatory workings.

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