SU969897A1 - Method of working thick horizontal and gently sloping deposits - Google Patents

Description

After removal of the pillars, the pillars in the developed space are left in the form of a truncated pyramid, directed by a large base towards the roof of the MeiMJ,. then, as the camera is laid, on contact with the entire formation, a new generation and compensation cavity is formed, and in the lower base of the rear sight, a cutting development, with

In this case, the lower part of the pillars is initially beaten onto the compensation cavity by wells drilled from the undercut development, and the remaining upper part is drilled out of the rising outflow by horizontal fans of boreholes and repulsed onto the previously broken and mazaginirovanny ore of the lower part.

The layer of backfill array on the contact with the whole and the compensation cavity is strengthened,

The upper part of the pillars is beaten with layers from the bottom up in a short time.

Figure 1 presents the working panel, the plan; FIG. 2 is the same, section A-A in FIG. 1; FIG. 3 is the same, section BB in FIG. 1; FIG. 4 is the same, section B-B of FIG. 1, on - section G-H of FIG. 4,

The drawing denotes haulage roadways 1, panel roadways 2, ventilation airways 3, panel cushes 4, column-shaped support pillars 5, delivery and transport roadways b, Orth 7, walkways 8, compensation cavity 9, backfill array 10, races 11, rising workings 12, hook-up bb1 processing 13, hardened backfill array (layer) 14,

Testing is carried out as follows.

The excavation site of the mine polch is prepared by haulage 1, panel 2f ventilation 3 and rifled drifts limited within the panel pillars 4, then mining of the excavation panels with the full thickness of the reservoir or with a leading upper undercut and subsequent stripping of the ledge with the step-by-step slab is made from the rifled drift self-propelled equipment. The roof of the cleansing space is supported with 5 pillars, left in the form of truncated pyramids, the larger base of which is directed towards the roof of the chamber, and allowing to reduce the span between the pillars, thereby significantly reducing the collapse of the ceiling of the clearing chamber, as well. also increase the stability of the lower layer of ceilings.

After the chamber stocks have been worked out, the developed space is over (They are placed with a hardening mixture in the usual order, by gradual laying through wells or using throwing machines, and delivery-transport bridges b are formed in the filling mass 10 (for two adjacent rows of pillars one bore) which are branched orthi 7, sheds 8 and the compensation cavity (space) 9, while seams 11 are sewn up (isolate),

Simultaneously with the above-mentioned workings, as layer-by-layer filling of the cleared space of the K Д Dmer treatment plant, near each pillar for the overhead monorail driving shelf, rebel 12 are arranged, in the filling array l6.

Upon reaching the upper level in the upper part of the housing array 10, walk groups 8 are connected to ventilation openings 3, which also serve to drain water from the bottom and form a group of panels. Then, after the hardening of the blocking massif is hardened and the necessary strength is established, the cutting of the excavation 13 is carried out directly in the leg of each rear sight 5.

Further, such labor-intensive processes as drilling and charging, are carried out from these pit-mines 13 and rebels 12,

Support pillars 5 with reduced stability, due to fracturing and weakly resistant lamination, are strengthened by laying around them a layer of hardened bookmark 14 (metal armonoplasty concrete or thickened pulp with the addition of cement), which eliminates ore mixing and bookmarks when breaking down the pillars and improves the quality of the mineral.

The hardened layer 14 is a metal reinforcement bearing metal rods (ropes) with a diameter of 10–20 mm and a metal mesh with 50–200 mm holes and a bar (wire) diameter of 3–8 mm. At the same time, the strength of such a bookmark for compression is 13-16 MPa and allows significant exposures of the backfill array (to a height of 15-30 m), which make it possible to increase the completeness of the excavation of the pillars and also to withstand dynamic loads during their breaking.

The stability of the rear sight 5 is provided by the compressive load and the force of adhesion to the reinforced stowing mass 14, depending on the angle of inclination and the areas of the contacting side inclined surfaces of the rear sight 5.

The width of the large side of the upper base of the truncated pyramid of the rear sight is determined from the expression:

B a + 2b; B h ctg.

where a is the pillar width at the base,. accepted by project-calculation, m;

L - additionally increasing the width of the large side of the rear pillar at the roof, m; h - ore extraction power

body, m;

d- is the angle of inclination of the side surface tse; 1ika to its vertical axis, depending on the extraction power of the ore body (° C 70-80 °).

In order to create horizontal workings in the filling array, before erection of the bookmark, pneumatic or hydraulic cylinder roof supports are provided, equipped with tensioning devices and rigid frames made in the form of the transverse perimeter of a given cavity, or mobile formwork with its subsequent extraction.

After the complete laying of the cleaning chambers and the formation of preparatory workings in the backfill array 10, after the latter has hardened, the pillars are blasted with 6-hole and borehole charges. At the same time, the lower part of the pillars 5 is coiled and blasted with a set of ascending deep wells from the undercut production 13, located directly in the leg of the pillar of the compensation cavity 9, created in the filling array near the rear pillar 5.

A set of wells is taken in a short-delayed manner at one time with a delay, starting from the extreme adjacent to the compensation cavity.

In the case of hole blasting of the upper part, the equipment of intercameral targets 5 is produced from the bottom upwards from the rising 12. with a notch on. 0.3-0.7 m to the border. Understand z.kladki.

Explosive spools, horizontally or with a slight bias, are placed over the entire cross section of the power supply system in a staggered order at a distance of 1.0–1.5 of one row from the other. The beaten off ore is stored inside the hardened bookmark l4, and as the pitch progresses upward, a partial release of ore is produced.

For loading and transporting the broken ore, loading delivery machines or means of vibration and other equipment are used.

The proposed method will make it possible to reduce the loss of ore due to the complete development of supporting pillars, to improve the quality of the extracted ore and to create a safe working environment.

Claims (3)

1. Method-development of powerful horizontal and gently dipping deposits, including the removal of ore by chambers, leaving column-shaped pillars, laying the worked-out space, the formation of drilling delivery and ventilation workings and the subsequent extraction of the pillars by drilling them and breaking down wells with fans, leaving voids in the backfill array after excavation pillars, different the fact that, with the aim of increasing the efficiency of development by reducing losses and diluting ore by laying and increasing the safety of work, pillars in the developed space left in the form of a truncated pyramid, directed by a large base towards the roof of the chamber, then, as the chamber is inserted, on the contact with the whole form the rising production and the compensation cavity, and in the lower base of the rear sight, the sweeping production, initially on the compensation cavity the lower part of the pillars are beaten off by wells drilled from the undercut excavation, and the remaining upper part is drilled out of the rising development by horizontal fans of boreholes and repulsed on the previously repulsed and mained ore of the lower part. 2. Method POP1, characterized in that the layer of the backfill array on the contact with the whole and the compensation cavity is strengthened. 3. Method according to Claim 1, about aphids and with the fact that the upper part of the pillars are beaten with layers from the bottom upwards in a short run. Sources of information accepted. Attention in the examination 1о Karazhanov DD and others. Issues of re-development of the Dzhezkazgan field. Technologists of the development of solid minerals. Issue 4, Alma-Ata, 1977, p. 10-13, fig. 1-3. 2. USSR author's certificate in application number 2926877, cl. E 21 C 41/06, 21.65.80 (prototype).