RU1786264C - Method for mining mineral deposits - Google Patents

Abstract

FIELD OF THE INVENTION This invention relates to the development of mineral deposits with the laying of a mined-out space. The goal is to reduce the cost of mining and drilling and blasting. The ore deposit is mined by primary chambers with the formation of inter-chamber pillars, which are mined by secondary chambers. The resulting space is laid. Secondary chambers work out in two stages. First, by working off the chambers at a distance from each other exceeding the sizes of the compliance zones, the pillars are crushed by displacement of the roof rocks. The dimensions of the compliance zones are determined by the calculation formula. After laying the cameras of the first stage, crushed pillars are worked out by the cameras of the second stage. 3 ill.

Description

The invention relates to the mining industry and can be used in underground mining of mineral deposits with the laying of the developed space.

A known method of developing mineral deposits (see ed. St. No. 1244317, class E 21 C 41/16, 1985), where the ore deposit is mined by primary mining chambers with interchamber ore pillars left, laying the treatment voids of the first mining stage, and then - the extraction of ore deposits from technological inter-chamber pillars (Kravchenko VP and others. The use of hardening tabs in the development of ore deposits, M .: Nedra, 1974).

The disadvantage of this method is that when excavating ore deposits from technological pillars by secondary mining chambers before the start of treatment work

it is necessary to carry out a significant amount of mining preparatory work, which significantly affects the cost increase in the cost of extracted ore.

The purpose of the invention is to reduce the cost of mining and drilling and blasting during the development of technological pillars by secondary chambers.

The indicated goal is achieved by that. that the extraction of deposits from technological pillars is carried out in stages by series of secondary mining chambers, a series of periods of treatment and filling operations.

In this case, the area of compliance of the massif is established by the formula for shrinkage of the bookmark determined by field observations:

Au 0.5 I ufife

where Au - adjustable value of the compliance of the array, m;

VI

00

about

to about

4j

I- moving the side of the camera, m;

YaC 1 0h tensile strengths on uniaxial compression of ore and bookmarks, MPa;

K is the reserve coefficient of deposits in the worked pillars, determined from the expression:

„., With d

° (d-f s) (d + b) where a is the width of the cameras of the first stage, m;

b is the width of the notch of the rear sight, m;

c - rear sight width, m;

d is the length of the pillar, m

In the zone of compliance of the massif, the roof lowers smoothly, without violating integrity and stability, as the bottom faces of the chambers move at the first stage of excavation of deposits from pillars.

Smooth, without breaking the integrity, lowering the roof under the pressure of overlying rocks crushes the whole in the embedded mass, which drastically reduces the cost of drilling and blasting operations when mining the pillars with secondary chambers.

In this case, the distance between the secondary mining chambers along the front A should be no less than the estimated length of the ductility Au.

In FIG. 1 shows embedded primary chambers and technological pillars, parameters of chambers, notches and pillars, an opening chamber and secondary chambers of the first mining stage; in FIG. 2 - secondary chambers of the second stage of mining; in FIG. Figure 3 shows the mechanics of smooth, without violating the integrity and stability, lowering of the roof by the set value of shrinkage of the bookmark.

The method is carried out as follows. After laying the primary chambers 1 and technological pillars 2 (Fig. 1), an opening chamber is passed, a working 3, from which the deposit is developed from technological pillars 2 by secondary chambers 4 of the first stage. In this case, along the movement of faces 3 and 4 (Fig. 3) along technological pillars 2, the elastic stress is removed from the latter and the roof of the chambers is smoothly without violating integrity and stability, lowering the roof of the chambers by the set shrinkage of the bookmark Ј by the distance Ау, and under the pressure of the mountain causes crushing of the pillars, which ensures minimal costs for subsequent drilling and blasting operations.

After laying the secondary chambers 4 of the first stage (FIG. 2), the deposit is excavated by the secondary chambers 5 of the second stage from crushed pillars under a stable smoothly lowered roof,

In each case, the distance A between the secondary chambers along the excavation 3 should not be less than the calculated value of the compliance Au.

Using the proposed method for the development of mineral deposits will allow to reduce the cost of mining and drilling and blasting operations.

Claims (1)

SUMMARY OF THE INVENTION A method for developing mineral deposits, including carrying out preparatory and rutting workings, excavating ore with primary chambers, forming pillars worked out in the second place, laying the mined-out space of the primary chambers with hardening mixtures, forming malleability zones, working the pillars with secondary chambers, sealing the bookmark with displacement of rocks roofing by the amount of shrinkage of the filling array and laying the voids formed by the filling material, characterized in that, with In order to reduce the costs of mining and drilling and blasting operations, the secondary chambers are worked out in two stages, first the chambers are worked off at a distance from each other exceeding the size of the compliance zone, the pillars are crushed by displacement of the roof rocks, while the dimensions of the compliance zone are determined from the expression AU 0.5G-.K, Oz where t is the movement of the bottom of the cameras; 7C, Oz - tensile strengths for uniaxial compression of ore and bookmarks, MPa; K is the reserve coefficient of deposits in the worked pillars, and then, after laying the chambers of the first stage, crushed pillars are worked out by the cameras of the second stage. g- Gps  / TW   N. / /. .-. L -.--.: - /. / .-. L1 a Lj. HjD Z -.- v :;  / G .Q: O: -: S: SiSiHSiP  / TW /// / 7-U --- Sh-WS98il 4  + ..D + - -h h