SU1252491A1 - Method of preventing water bursts from flooded workings when mining thick sloping coal seams - Google Patents

Description

one

The invention relates to the mining industry and is intended to prevent water breakthroughs from flooded openings when developing thick flat and inclined coal seams.

The purpose of the invention is to clean the coal in its entirety.

The drawing shows a schematic section across the strike

reservoir.

The method is as follows.

in a way.

Within the limits of the barrier pillar 2–3–4–5 d wide and built on the border of the flooded openings, adjacent to the border 6 of the pillar from the working openings 7, the pillar is excavated by layer-by-layer mining in the direction from the roof to the soil of the formation. During the processing of the first layer in section 8, the width of which, according to the ratio

(one)

L -5 (m-m,) - lO (n-l),

PI

where m - removable reservoir capacity, m;

m is the power of the first layer, m;

n is the serial number of the layer, counting from top to bottom,

equals

L - 5 (m-m,) - 10 (I-I) - 5 (,),

between the exhausted space of this layer 8 and the flooded workings 1 there remains an unworked area 9 wide

d-L, - 5m, -t- 0.05H 0.0021,

Editor A. Sabo

Compiled by V.Pushkarsky

Tehred M. Khodanich Proofreader L. Pilipenko

Order 4601/34 Circulation 470 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

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

524912

satisfying the requirement of the required width of the barrier pillar when developing the reservoir thickness t.

Thus, during the development of the first layer 8 in the area of the barrier pillar 2-3-4-5, water is prevented from penetrating from the flooded openings I into the developed space of this layer. According to relation (1), Perin is from 10 working areas in each of the underlying layers 10, Hume less than in the underlying layer, and the width of the unsplit area between the flooded 15 workings 1 and the worked out space of each layer, respectively, Hume more than in the upper layer. After working out all the layers between the developed output

20 space and submerged workings 1 remain coal pillar 1I step form, the width of which in the upper part satisfies the requirement of the required width of the barrier pillar in the development of the reservoir thickness m, and the width of each step is 10m. Special studies carried out at the All-Russian Scientific Research Institute of Technical Research have shown that in the development of thick seams with layer separation, coal pillars of this shape and size are stable both against fracture of overburden rocks and shear under pressure of water in submerged workings. It also follows from relation (I) that the loss of coal in the left coal pillar 1I will be the smaller, the smaller the power of the first layer and the smaller

the number of underlying layers.

Claims (1)

METHOD FOR PREVENTING WATER BREAKTHROUGH FROM FLOODED PRODUCTS DURING THE DEVELOPMENT OF POWERFUL CANOPIES AND TILTING COAL LAYERS, including leaving at the border of the flooded workings a barrier pillar of width d, determined from the relation d = 5ш + 0.05Н + 0.0021; where m is the removed capacity of the reservoir, m; H is the vertical distance from the earth's surface to the border of the flooded workings; f is the total length of the underground theodolite passages that determine the position of the boundaries of the flooded and existing workings, m, characterized in that, in order to reduce coal losses in the pillars, a part of the barrier pillar is excavated by layer-by-layer processing in the direction from the roof to the soil from the formation in the area, adjacent to its border from the side of existing workings, while the width of the worked out section L for each layer is determined from the ratio L = 5 (mm,) - 10 (η-1), where m _t is the thickness of the first layer, m; η is the serial number of the layer, counting from top to bottom. SU „„ 1252491