SU1680990A1 - Method for working very thin gently sloping coal seams - Google Patents

Abstract

The invention relates to mining and is intended for underground coal mining. The goal is to increase productivity and reduce the energy consumption of coal extraction by creating an extraction zone for the marginal part of the formation. Breaking the coal in the lava lead excavation mechanism. The cleaning space is supported by a lengthy shell. In the soil of the reservoir in front of the clearing flank and parallel to it from the drifts of the borehole (C). They are charged with a non-explosive expanding substance (NRB). Charging is carried out at a time when the distance in the plane of the reservoir between C and the clearing of the slab is S Uz (ta + tH), where Uz is the average speed of the advancement of the clearing slab, Uz 5: (А + 3) V / b; A is the width of the clearing face; Y is the rate of elevation of soil rocks in the lava above С when the NRB swells; b - the maximum allowable amount of soil swelling within the clearing area; 3 - the width of the spin zone, 3 (I - h2); I is the line of least resistance of this NTR in bottom rocks; h is the depth C of the soil below the soil level; t3 is the charging time of C; tH is the duration of pressure buildup in C to the value at which the line of least resistance 1 slug is determined for a given NTR. yo

Description

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The invention relates to underground coal mining and can be used in the excavation of very thin flat coal seams.

The purpose of the invention is to improve the coal blasting capacity by reducing the energy intensity of its destruction by creating an extrusion of the marginal zone of the formation.

The drawing shows a design development flowchart.

The method is carried out as follows.

Collecting coal in lava is carried out to the full thickness of the reservoir by means of a notch (for example, a coal saw). The cleaning space is fenced off from the developed and supported by a long inflatable casing.

Transportation of coal is carried out by pumping water under pressure between the roof, the soil, the bottom and lengthy shell

Into the soil of the seam, ahead of the clearing flank, of the drifts, passed with the lower or two-sided undercutting, are drilled along the entire length of the lava parallel to the line

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bottom surface and the soil surface of the well and charge them with a non-explosive expansion agent (NRB) at a time when the distance in the plane of the reservoir between the well and the refining line will be in position 1

S V3 (t3 + xn), where Tz is the time of well loading;

Hn is the duration of the increase in pressure in the well to the value at which the line of least resistance (L N) is determined for a given DFB in these rocks;

/ 3 average speed

plowing;

A - the width of the clearing face from the bottom of the chest to the rear lin lining;

V is the rate of elevation of soil rocks in the lava above the well when the NRB swells in the well;

0 - the maximum allowable amount of swelling (lift) of the soil within the clearing face

3 (I2 - 1m2) - the width of the spinning zone (the position of the bottom);

1- the line of least resistance (LNS) of the given NRB in these rocks;

h is the depth of the well below the level of the soil surface.

At the same time, as the NRB is activated in the well, the pressure from the soil rocks on the coal in the bottomhole increases.

In order that the soil of the reservoir slowly swelling with the action of the URB does not interfere with the normal operation of the mechanisms and the support in the lava, it is necessary to completely move the lava through section 2 above the well until the lifting of the soil exceeds the maximum allowable. Obviously, the largest amount of elevation of the soil within the lava is when the rear part of the lining or rear part of the mechanism passes over the well, depending on the specific technology of excavation in the lava. Position 3 of the bottom and point C correspond to the position of the back line of the lining (mechanisms); b - maximum permissible maximum value of soil lifting in lava.

The swelling of soil in lava begins when it enters the bottom line at point a, and ends when the lava passes the back

line point C, i.e. the lava travels the distance A + 3.

Thus, to ensure the extraction of coal in zone 3 and at the same time

normal operation of the mechanisms of lava and lining, it is necessary to begin the drilling of the well or the activation of the NRB in the well, when the distance in the formation plane between the bottom line and the well is S.

Claims (1)

Invention Formula The method of development of very thin flat coal seams, including the conduct of reservoir drifts, the formation of a clearing slab, excavation coal excavation the mechanism in the lava, drilling into the soil of the reservoir of a small diameter borehole from the reservoir drifts ahead of the clearing hole parallel to it and the soil surface, well bore, displacement and separation of the soil rocks a reservoir, characterized in that, in order to increase productivity and reduce the energy intensity of coal mining by creating a spin zone of the edge of the reservoir, the well is charged non-explosively destructive substance before approaching it S V3 (ta + tH), where V3 is the average speed of the sweep (A + 3) v. , And - the width of the clearing flank; V is the rate of raising in the lava above the well of soil rocks when the non-explosive destructive substance in the well swells: b is the maximum allowable amount of swelling (lifting) of the soil within the clearing area; 3 - spinning zone width, 0 3 (I2 h2) 0 5; I is the line of least resistance of a given non-explosive destructive substance in these rocks; h is the depth of the well below 5 soil level; X3 — well charging time; xn is the duration of pressure buildup in the borehole to the value at which the line of least resistance is determined for a given non-explosive destructive substance in these rocks.