SU711290A1 - Method of working thick gently sloping coal beds - Google Patents

Description

one

The invention relates to the mining industry and can be used in the development of thick flat coal seams, mainly under protected objects.

There is a method of developing powerful flat coal seams under protected objects / including coal extraction with cameras, leaving supporting pillars 1.

However, this method is characterized by significant loss of coal.

There is also known a method of developing three sloping thick flat coal seams, including the carrying out of preparatory workings for each of the layers before the development of the latter and the excavation of layers 2 ./

The aim of the invention is to increase the efficiency and safety of development under the protection of objects when excavating layers with an unstable roof.

This is achieved by firstly excavating the upper layer at full capacity with laying the developed space with a hardening mixture, then working the lower layer with thin slits in the sequence from the soil of the reservoir to the top of the lower layer, then producing the middle layer with thin slits in the sequence from the top of the middle layer to its soil, and the middle layer workings are formed by combining the adjacent workings of the lower layer with the adjacent workings of the upper layer during excavation

0 coal pillars between them, and the layers, respectively, are worked out after the roof has been displaced before the cleaning face of each subsequent layer excavation.

five

FIG. 1 shows the scheme of mining the upper layer; in fig. 2 - the same, the bottom layer; in fig. 3 - the same, the middle layer.

The method is as follows.

0 Powerful flat coal seam with an unstable roof is worked out by three inclined layers with carrying out preparatory workings for each of the layers prior to the beginning of mining

5 last. The development of the lower layer can be carried out both along the seam and with the addition of soil rocks. The top layer development is conducted through the formation. First full

0 power removed the top

layer 1 with the supply of a hardening mixture to the developed space A part of the workings 2 is retained in the tab using backfill lining 3. After working out the upper layer after the roof rocks are displaced, they start to excavate the lower layer 4 with thin gaps 5 in sequence from the soil of the reservoir to the roof of the lower layer. After the displacement of the roof rocks is completed, the middle layer begins to be worked out by 6 thin gaps 7 in a sequence from the top layer of the middle layer to its soil. BupaeoTkH of the middle layer is formed by combining the adjacent workings 8 of the lower layer and the workings of the upper layer during the excavation of the pillars 9 between these workings.

Subsequently, when developing the subsequent extraction poles, the operations are repeated.

The proposed method will make it possible to effectively and safely work out powerful flat coal seams under protected objects.

Claims (2)

1. Gapanovich L.N. et al. Generalization of domestic and foreign experience in the development of flat and inclined seams, Moscow, Gosgortekhizdat, 1959, p. 69 2. Nikitin V.D. and etc. Development of flat and inclined seams. M ,, Nedra, 1976, p. 92-98 (prototype). J /: -W / ky / 4 / / P / tU- -CH g 4x -1 / V / - / X .. well .- "- -h- -LU.UU  . / , U2.f 5 U2.2 y./,/. 5