SU1566024A1 - Method of working series of thin coal strata and strata of middle capacity - Google Patents

Abstract

The invention relates to the coal industry and is intended for underground mining of coal seams. The goal is to increase the efficiency of working out the formations of steeply dipping seams by increasing the stability of field group drifts. Precinct drifts on the ventilation and haulage horizons, intermediate quarschlags at the boundaries of the excavation fields, and field group drifts. Extraction floor work out ahead of each other. At the same time, the field group drifts are trailing behind the cleaning works to one notch field. In the excavation field being worked out, auxiliary reservoir drifts are formed on the ventilation and outflow horizons by expanding the district drifts to the section of the group after the passage of the lava of the specified district drifts of the latter in the formation suite. The sectional drifts, after mining each excavation floor, are connected to auxiliary drifts, which are maintained within the limits of the prepared, practiced and developed excavation fields, and then are extinguished after the connection with the field group drifts. With insufficient stability of reservoir drifts, auxiliary drifts are formed by carrying out additional field workings. 1 hp f-ly, 5 ill.

Description

The invention relates to mining and can be used in the development of suites of contiguous thin and medium thickness coal seams.

The purpose of the invention is to increase the efficiency of mining of steeply dipping formations by increasing the stability of field group drifts.

FIG. 1 shows the layout of field group drifts in

zone repeatedly unloaded from rock pressure; Fig. 2 shows a section A-A in Fig. 1 (a scheme for preparing a ventilation horizon with reservoir auxiliary drifts); on fig.Z - section bb in figure 1 (the same, pumping horizon); in fig. 4 is a diagram of the preparation of the haul horizon with a field auxiliary drift; in fig. 5 - preparation scheme

The haul-off horizon with the division of the suite into groups and the redemption of auxiliary drifts of the advance group after connection with the auxiliary drift of the lagging group.

The method is carried out as follows.

The mine field, within which thin steep seams are worked, is opened by vertical trunks and storey logs.

Layers 1-3 (Figures 2–5) work in descending order, with the mine floor wing divided into excavation fields 4–6.

Layers 1-3 (Fig.2 and 3) work out simultaneously with the advancement of one cleaning floor to the other from the capital crosscut to the boundaries of the mine floor. On the haulage (Lig.Z) and vent (Fig.2) horizons, divisional drifts 7-9 and 10-12, intermediate quarters 13, 14 and 15, 16 are conducted on the border of each excavation floor 4 and 5 and group field drifts 17 and 18 In the section across the strike (Fig. 1, group field drifts 17 and 18 are located in a repeatedly unloaded zone formed after mining of the formations 1-3 layers. When working the excavation floor 5 in the retraction zone (Fig. 3 and ventilation) (Fig. 2) horizons group field drifts 17 and 18 are carried out within the excavation floor 4 with a lag along the strike tons of cleaning work on one excavation field,

An 8m excavation field 5 on the haulage (Fig. 3) and vent (Fig. 2) horizons auxiliary drifts 19 and 20 are constructed by expanding the sectional drifts to the section section after the passage of their own lava

9 and 12 of the latter being worked out in the formation 3 formation, the divisional drifts 7-9 and 10-12 of Fig. 3 and 2, after working out the excavation field 4, are connected by means of 13 and 15 with auxiliary drifts 19 and 20. The latter (Fig. 3 and 2) are supported during the preparation of the excavation floor 5 being prepared, within which they were built, and the previous excavation floor

floor 4 and then redeem after soy

Dineni with field group shtre- (kami 17 and 18.

After working the layers 1-3 within the excavation floor 5 (figure 2 and 3)

five

0 5 0

P

Q

five

five

and the transition of the cleaning works to the next excavation field, local drifts 7–9 and 1 O-12 at the haulage and ventilation horizons are connected with new intermediate cross-sections with auxiliary drifts 19 and 20 (not shown), field group drifts 17 and 18 are led to the level excavation field 5 and connected with auxiliary drifts 1 9 and 20, which are redeemed within excavation field 4. With such a pattern of holding and maintaining workings in time and space and such a lag between cleaning and preparatory developments along fins 1-3 work over the entire wing of the mine floor.

With insufficient stability of reservoir auxiliary drifts 19 and 20 (Fig. 3 and 2) that do not provide the necessary level of technological reliability of the network of mine workings, an auxiliary drift on the haul horizon (the ventilation horizon preparation scheme is similar and not shown) is constructed by carrying out additional field development 21. This variant of the haulage preparation scheme is applied when mining the seams according to the pillar system of development to the front quarters 13 and 14 (FIG. 4).

When working the excavation field 5, the haulage field group drift 17 is carried out within the excavation field 4 with a lagging along the strike from the cleaning works to one excavation field (Fig. 4).

On the hauling horizon, in the prepared excavation field 6 (Fig. 4), divisional drifts 7-9 are made and auxiliary drift 20 is constructed by carrying out additional field development 21. The divisional drifts 7-9 are connected with an industrial floor 4 (Fig.4). 13 with an auxiliary drift 20, which support the excavation 6 being prepared, the 5 and the previously spent 4 fields being worked out, and then extinguished after being connected to the field group drift 17.

With a significant number of contiguous layers in the suite, the mining of layers is carried out with division into groups 22 and 23 (figure 5). At the same time .6

7 8 920

1

Claims (3)

Claim 1. A method of developing a suite of thin and medium thickness coal seams, including the conduct of district drifts on the ventilation and discharge horizons, intermediate cross-bars at the boundaries of excavation fields and field group drifts, the connection of district drifts with a field group drift, the lag of preparatory work from the treatment drift is only 10 excavations field and mining of excavation fields ahead of each other, characterized in that, in order to improve the efficiency of mining suites of steeply falling seams 15 by increasing the stability the group drifts are lagging behind the sewage treatment operations, field group drifts pass in one of the excavation fields; auxiliary drift drifts are formed in the worked-out excavation field 20 on the ventilation and discharge horizons by expanding the district drifts to the section of the last drift drifts last 25 after passing the lava in the formation suite, while the local drifts after working out each excavation field are connected to auxiliary drifts, which are maintained within squeezed, worked out and worked out mining fields, and then extinguished after connecting with field group drifts. 2. ' Pop Method 1, characterized in that when the stability of the formation drifts is insufficient, auxiliary drifts form by 40 additional field workings. \ /// W * / 7 8 9 20 FIG. 1 4-4 (rotated) Phi. " J yy ___ a_