SU1617145A1 - Method of reducing water inflow into mine workings - Google Patents

Abstract

The invention relates to the development of coal seams under watered sediments. The goal is to increase the safety of mining operations by ensuring acceptable water inflows and eliminating water breakthroughs from watered rocks into mine workings during the development of coal seams. The watered rocks are drained by mining the reservoir at a distance from them less than the height of the zone of water-conducting cracks, but more than half of this height. At the same time, reservoir mining starts from the boundary of the flooded area at a distance in the plan determined by the calculation formula depending on the primary landing step of the main roof, the vertical distance from the reservoir to the watered rocks, the bedding angle and the angle of sediment rupture. Lead the formation of the fall. Moreover, after the primary landing of the main roof, the reservoir mining is carried out at a rate determined depending on the allowable water influx into the mining output, the thickness of the flooded bed, their water content and the length of the flooded bed along the strike. 2 Il.

Description

The invention relates to the mining industry and is intended to reduce the flow of water into the mine workings. when developing coal seams.

The purpose of the invention is to increase the safety of mining operations by ensuring permissible water inflows and eliminating water breakthroughs from watered rocks into mine workings during the development of coal seams.

FIG. 1 and 2 show vertical sections across the strike of the formation.

The method is carried out as follows.

If there are heavily flooded rocks or flooded excavation 1, a seam 2 is removed that is remote from

flooded production 1 to the distance L, which is in the range of 0.5-0.8 Nt where Nt is the height of the zone of water conducting cracks formed above the developed space of formation 2,

The coal seam 2 begins to work in the direction of the fall from a point remote from the boundary of the flooding 3 in terms of the distance determined from the ratio

;;; iT + Acos a,

tg "+ tg /

AT

ON

cl

where a is the bedding angle:

 - the angle of rupture, which determines the position of the boundary of the zone of water conducting cracks from the side of the fall;

And - a step of primary landing of the main roof;

After the primary landing of the main roof, the speed of the clearing dredging of layer 2 is set to / (it’s not more than

where Qg is the allowable water inflow into the sewage treatment of formation 2;

K - coefficient of flooding of water production or the coefficient of water content of flooded rocks;

 m removed power (height) of the flooded excavation or thickness of the layer of flooded rocks;

C - the length of the excavation or layer of flooded rocks in the direction of the strike

seams.

Removal of the start of 4 refining workings

5 at the specified distance excludes the supply of water during the landing of the main roof.

Then, as the uphole 6 of the clearing excavation 5 moves in the direction of the fall under the submerged excavation 1, a uniform inflow of water is established along the extreme cracks 7 on the side of the reservoir formation, whose position is characterized by the angle of fracture UZ. Clearing Speed

6, at the same time, it is selected from the above condition, the observance of which ensures the inflow of water to the treatment output, not exceeding the permissible value.

So, during the time T of undershoot with speed V, face 6 passes the distance S VT. At the same time, the level of flooding production 1 from position 8 decreases to position 9, and water from the flooded production 1 enters the treatment plant 5 in volume

G KmCS.

The flow of water does not exceed the permissible water inflow Ctg provided

oh - 4

-

or

Qq K-mCVT

T

Where is the speed of advancement of the clearing slab, i.e. permissible water inflow

Thus, mining the reservoir 2 at the indicated rate ensures consistent drainage of the submerged production 1 in the direction of the reservoir fall at 10 permissible water inflow into the treatment output 5.

F o rm u l a i 3 b ate n a Method of reducing the inflow of water to the mine workings, including the drainage of aerated rocks by mining the reservoir at a distance from them, determined from the ratio of O.BT. where Нт is the height of the zone of water-conducting cracks above the developed space of the reservoir being worked out, which differs from that. that, in order to increase the safety of mining operations, by ensuring permissible water inflows and eliminating water breakthroughs from the watering rocks into the mining 25, during the development of coal seams located within the boundaries of the flooded areas, the formation of the reservoir starts from the boundary of the flooded area

In L + ACOS a,

thirty

35

40

tga + tg / 3 where L is the vertical distance from the reservoir under development to watered rocks;

And - a step of primary landing of the main roof;

a is the bedding angle;

H - the angle of rupture from the side of the fall. and carry it out by the dip of the formation at the rate of mining after the primary landing of the main roof

-Kj

where Qg is the permissible water inflow into the mine workings;

m is the thickness of the layer of flooded rocks; e

K is the water content factor of the water-rich rocks;

C - the length of the layer of water-cut rocks

strike.

AcOSoi

Phi2,1

8--85M

FIG. 2

Claims (1)

Claim A method of reducing the influx of water into mine workings, including drainage of flooded rocks by working out the formation at a distance from them, determined from the ratio of 0.5 Nt ^ L <Nt, where Nt is the height of the zone of water-supply cracks above the worked out space of the mined formation, characterized in that, for the purpose of increasing the safety of mining operations by ensuring acceptable water inflows and eliminating water breakthroughs from flooded rocks into mine workings when developing coal seams lying within the boundaries of flood zones, I begin to develop the seam from the border of the flooded area at a distance in terms of B> ---------- gg + Acos a, tga + tg / T where L is the vertical distance from the developed formation to waterlogged rocks: A - step of the primary landing of the main roof; a - bed angle; ββ is the angle of the gap from the side of the fall, and it is carried out according to the dip of the formation with a mining speed after the primary landing of the main roof where Qg is the allowable water inflow into the mining 'output: m is the thickness of the layer of waterlogged rocks: K is the coefficient of water availability of watered rocks: C is the length of the layer of flooded rocks along strike.