Way to save the earth's surface in underground development of coal

 

(57) Abstract:

The invention relates to the mining industry. The essence of the invention lies in the fact that wells from the surface of the earth drill at an angle equal to the angle of displacement of the rocks, and at length 10-20 m, having them in a checkerboard pattern at a distance from each other corresponding to the size of the zone of active displacement of the surface of the earth, followed by the binding species by feeding the solution into the resulting hole. The result is reduced lowering the earth's surface, is maintained her ground and surface structures. 2 Il.

The invention relates to the mining industry, namely to underground coal mining and the environment at the same time.

There is a method of preserving the earth's surface through abandoned mining the pillars of coal (1). The disadvantages of the method are the crushing of pillars under the action of rock pressure that does not reduce the lowering of the surface; and the pillars cause large losses of coal.

The closest technical solution is to reduce the lowering of the earth's surface using full or partial laying-out space, perceiving the subsidence of the overlying strata (2). How arcsine her sinking is not accepted.

The essence of the invention lies in the fact that wells from the surface of the earth drill at an angle equal to the angle of displacement of the rocks, and at length 10 - 20 m, having them in a checkerboard pattern at a distance from each other corresponding to the size of the zone of active displacement of the surface of the earth, followed by the binding species by feeding the solution into the resulting hole.

The location of wells at an angle of displacement of rocks contributes to the suspension of the process of formation of mould on the surface of the earth.

The size of the zone of active displacement of the earth's surface as the result of coal extraction allows you to make the right choice of the distance between wells in order to considerably reduce the lowering of the earth's surface. So by increasing the speed of podvigina lava and, consequently, the reduction of the zone of active displacement of the surface of the earth the distance between the wells should be reduced. When the speed reduction podvigina lava and the increase in the active zone of displacement of the earth's surface, the distance between the wells can be increased. This is confirmed by the calculation given in the description of the invention.

If the length of the wells, less than 10 - 20 m, deteriorating the fixing surface of the earth because of the lack of the ski disadvantageous.

In the fastening surface of the earth with consideration of the zone of active displacement of rocks and laying-out space decreases significantly lowering the surface of the earth is soil and surface structures.

The proposal is illustrated by the following drawings: Fig. 1 shows the surface of the earth above the clearing face; Fig. 2 is a cross section of the site, And-A.

The method is as follows.

On the surface of the earth drill over a goaf of longwall 1 well 2 in a checkerboard pattern with the distance between the wells, depending on the size of the zone 3 active displacement of the surface, installed on curve 4 - changing the value of lowering the surface depending on the distance to the stope. The angle of wells equal to the angle of displacement of rocks 5 extending from the reservoir 6 and laid out space 7. The implementation of the method is illustrated by example to determine the maximum speed podvigina lava by the formula

< / BR>
where

l is the length of the active zone of surface displacements;

h - the maximum value of lowering the surface within the zone;

t - time stratification of rocks from the formation to the surface;

m - power is = 3 m; t = 2,5 days. ; = 30o. Then Vmlax= 4.5 m/day., when lowering the surface will not be more than 20 cm and will tend to decrease.

Sources of information:

1. Technology of underground mining of mineral deposits. Textbook for high schools /Under the General Editorship. A. C. Burdakova. - M., Nedra, 1983, S. 313.

2. Mashkovtsev I. L. the Technology of underground coal mining. The tutorial. - M., Izd-vo UDN, 1983, S. 29.

Way to save the earth's surface in underground development of coal, including full or partial mined-out space in the separation of coal in the lava, characterized in that the surface of the earth drill the hole at an angle equal to the angle of displacement of the rocks, and at a depth of 10 - 20 m, having them in a checkerboard pattern at a distance from each other corresponding to the size of the zone of active displacement of the surface of the earth, followed by the binding species by feeding the solution into the resulting hole.

 

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