SU1514935A1 - Method of mining ore deposits in rooms with stowing - Google Patents

Abstract

This invention relates to the underground mining of ore deposits. The goal is to reduce the clogging of ore with the material of the bookmark and improve the ore output as a result of a decrease in the area of contact of the ore with the backfill mass and increase the stability of exposures in the chambers by reducing the concentration of stresses in the roof of the chambers. The field is mined downwards in order. Pass t preparatory development. Ore mining at the horizons is carried out with chambers (K) with a vaulted roof and trenches in the bases of the bottoms, similar to the mirror image of the roof. Pillars are formed between K, with pillars on each overlying horizon being formed above K of the underlying horizon along the extension of their vertical axes. In adjacent horizons, K is shifted relative to each other along the strike and, after working, is laid with a hardening tab. The development of intercameral pillars is carried out after the excavation of reserves K of the lower horizon with collapse of the pillars and release of ore through these K, and as the K subterranean horizon is mined, they are cut between the chamber pillars of the overlying horizon from the ore massif at the intersection of the vertical walls of the upper K with their inclined walls trenches. The amount of displacement K of the lower horizon relative to K of the overlying horizon is determined by the calculation formula depending on the length and width K, the allowable area of vertical outcrops of pillars, the angle of repose of broken ore and the width of the drilling for the development of pillars. 3 il.

Description

The invention relates to the mining industry and can be used in the underground mining of mineral deposits by chambers with the laying of the worked out simple. hardening mixture.

The purpose of the invention is to reduce the clogging of ore by the material of laying and improvement: indicators of ore output as a result of a decrease in the area of contact of the ore with the backfill array and increasing the stability of outcrops

in chambers by reducing the concentration of stresses in the roof of the chambers.

Fig. 1 shows a mining section of an ore deposit, a vertical projection; figure 2 - the same, axonometric; on fig.Z - mutual placement of chambers with the described ellipses in the area of the ore deposit.

The method is carried out as follows.

To mine the ore deposit it is divided vertically into horizons 1. Preparatory workings are made. Development lead from the top to the bottom of the horizon. Within the upper horizon, chambers 2 are worked with a roof 3 of arched shape and trenches 4 in the bases of the bottoms, similar to mirror reflection of the roof 3. The distance between the axes of chambers 2 depends on the amount of displacement of chambers 5 of the underlying horizon relative to the horizon chambers. The offset value is determined from

b

0.5V (h-)

WITH-. 4-, tgod B) - (-)

+ C, m,

where B is the width of the chamber, m;

3. „- the maximum allowable is flat. at

Vertical Exposure

ore walls, m,;

L is the length of the chamber, m;

. - angle of repose of broken ore, hail;

C - the width of the drilling development for

working out the rear sight, m. The distance between the axes of the chambers 2 at the same time is assumed to be 2b. With this mutual arrangement of chambers 2 EZ, interchamber pillars 6 are formed between them within the limits of the working horizon, which exclude lateral contamination of the ore with filling material that fills the volume of previously used embedded chambers. Interchamber pillars 6 on the overlying horizon are formed above the chambers of the lower horizon along the extension of their vertical axes.

After processing the chambers 2 of the overlying horizon, filling them with a filling mixture and acquiring sufficient strength with this mixture, the chambers 5 of the underlying horizon are developed. Cameras 5 below go

0 5

0

five

0, -

.

0

The rizonta is formed similarly to the chambers 2 of the overlying horizon and is displaced along the strike relative to the overlying chambers 2 by the indicated calculated value. As chambers 5 are developed, interchamber pillars 6 of the overlying horizon are cut off from the ore massif at the level of conjugation of the planes formed by the vertical wall 7 of the overlying chamber 2 and the inclined wall 8 of its trench. At the same time, chamber 5, including its roof 9, acquires a form that is closest to the shape of the body of natural equilibrium with ore and pillars 6 in the parts of chambers 2 and 5 subjected to the greatest destructive loads from the action of rock pressure and blasting. increase the stability of these chambers and reduce clogging of the ore backfill material. After working the camera 5 of the lower horizon, the inter-chamber pillar b of the overlying horizon is worked out by collapsing its reserves into the underlying chamber 5 and releasing ore through this chamber. On subsequent horizons, the chambers and the pillars are worked out in the order described.

Claims (1)

Invention Formula A method of developing ore deposits with cameras with a tab, which includes carrying out preparatory workings, working out chambers with a vaulted roof and trenches in the bases of the bottoms similar to mirror reflection of the roof, forming inter-chamber targets. and their subsequent mining, the development of reserves in horizons in descending order and the displacement of the chambers of the underlying horizon along the strike relative to the chambers of the overlying horizon, characterized in that, in order to reduce the ore contamination by the material of the deposit and to improve the ore output indicators by reducing the contact area of the ore with a backfill array and increase in the stability of exposures in the chambers due to the concentration of stresses in the roof of the chambers, the displacement of the chambers of the underlying go, rizont relative to the chambers above ezhaschego horizon produced on value determined from the expression FIG. one fsh  -. . :: Have fig.Z