SU1229342A1 - Method of excavating rock from safety pillars under water objects - Google Patents

Description

The invention relates to the mining industry and can be used in the development of coal seams within safety pillars under water bodies.

The aim of the invention is to increase the efficiency of coal extraction by reducing the loss of coal in safety pillars.

The method is carried out as follows.

When developing coal seams under water bodies in the developed space, they leave-resistant tape pillars at a distance from one another, while preventing the spread of water-carrying cracks formed by the developed space to the water body, and is determined at H 200 m from the ratio

2293422

and when H 200 W of the ratio

Dgn

e.

.T.

where is H

1t.

N „

to

15

20

P

1- (1.

1On

Ng {1-0,02x / N /

N. - depth of development ,, m

- removable power of the plate, m;

—distance from the reservoir to the water body, m;

the height of the zone of water-conducting cracks above the working space at the time of mining of the layer to a depth of 200 uts, without laziness of the pillars in the excavated space, m; the angle of complete displacement of the strike of the reservoir, gr is the minimum value to the subsident of the subsidence at which the earth’s surface settles down.

(one

f

t

,

Editor G. Volkov Order 2428/28

Compiled by V.Pushkarsky Tehred NoBonkalo

Corrector L

Circulation 470 Subscription

VNIIPI USSR State Committee

for inventions and discoveries P3035, Moscow, Z-ZZ, Razpska nab., d.4 / 5

Production and printing company, Uzhgorod, Projecto st., 4

gn

e.

.T.

1- (1.

1On

Ng {1-0,02x / N / -200

where is H

1t.

N „

five

0

P

N. — depth of development ,, m;

- removable reservoir capacity, m;

- distance from the reservoir under development to a water body, m;

the height of the zone of water-conducting cracks above the developed space with the full development of the reservoir at a depth of 200 uts, without leaving the pillars in the developed space, m; the angle of complete displacement along the strike of the reservoir, hail; the minimum value of the underworking ratio at which the subsidence of the earth's surface takes place.

Proof LoPatai

Claims (1)

METHOD FOR COAL EXTRACTION FROM SAFETY POSITIONS UNDER WATER OBJECTS, in which stable tape pillars are left in the worked out space during development of the formation at a distance from one another, while the propagation of water-borne cracks forming above the worked-out space to a water body, which is different that, in order to increase the efficiency of coal extraction by reducing coal losses in the safety pillars, the tape pillars are left at a distance D-one from the other, determined at H * 200 W from the ratio a for H> 200 TP - from the ratio D 2L &. [1 - (1 - nJ / 1 —— ·.-Ί, · M _t (1-0,02 / n / g> -200 where N is the depth of development, m; m is the removed capacity of the reservoir, m; H ₀ - the distance from the developed layer to the water body, m; N _t is the height of the zone of water-supply cracks above the worked-out space when the reservoir is fully developed at a depth of up to 200vn without leaving pillars in the worked-out space, m; - angle of complete displacements along the strike of the formation, degrees; h ₀ - the minimum value of the coefficient of underworking, at which there is a subsidence of the earth's surface. ''