RU2568447C1 - Development of thick inflammable steeply inclined coal beds - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: claimed process comprises the division of the bed into on-dip plies and development of every ply with division into mining slabs. Every mining slab is confined over the bed width by interslab airtight bridges and the boundary of the on-dip bed plies division into plies into levels. Coal muck is delivered to coal shoot and, further, via bottom gate to the mine loading complex. At division of on-dip ply into levels interlevel coal pillars are left on-dip height of which H (m) is defined from the expression: H≥(2.1-3.5)M, where M is the mining height (m). Interlevel pillars are erected artificially at preparation of mining slabs for development.

EFFECT: higher safety of development.

2 cl, 2 dwg

Description

The claimed technical solution relates to mining, namely the development of powerful fire hazard steeply inclined coal seams.

A well-known layer system for the development of powerful coal seams (Fundamentals of mining / P.V. Egorov, E.A. Beaver, Yu.N. Kuznetsov, etc. - Moscow: Publishing house of Moscow State Mining University, 2000. - P. 257), including dividing the reservoir into inclined layers, working out the layers in a descending order. Development of the layers is carried out by pillar development systems with the movement of the working face along the dip of the formation with division into horizons. In the layers to prepare for the treatment dredging, the necessary workings are carried out, including coal-run furnaces for delivering the beaten-off coal, a recoil drift, which is part of the loading complex of the mine, is performed one on several layers.

The indicated technology is characterized by significant losses in the bowels of coal, high fire hazard and, as a consequence of this, low technical and economic indicators.

The closest in technical essence and the achieved result to the claimed method is a method for developing powerful steeply inclined coal fire hazardous seams with collapse of the roof (RF patent No. 2263213, IPC E21C 41/18, publ. 10/27/2005, bull. No. 30), according to which divide the layer into layers by dip, each layer is worked out divided by extraction blocks, while each extraction block is limited by the width of the formation with interblock airtight jumpers and by falling of the formation by the boundary of division of the layer into horizons, beaten coal is delivered to coal a blast furnace and then through a haulage drift to the loading complex of the mine.

The specified method is characterized by increased danger during the development of fire hazardous areas of the reservoirs. The presence of air flows between the exhausted space and the mine atmosphere in steeply inclined coal seams can lead to endogenous ignition of coal.

EFFECT: increased safety of mining powerful fire hazardous steeply inclined coal seams by reducing the likelihood of air penetration into the waste space of an overlying horizon.

The specified technical result is achieved by the fact that in the method for developing powerful fire hazardous steeply inclined coal seams, including dividing the formation into layers by dip, mining each layer by dividing into excavation blocks, each extraction block is limited by the width of the formation with interblock airtight jumpers and by the fall of the formation by the boundary dividing the layer into horizons, delivering the beaten-off coal to a coal-blast furnace and then through a haulage drift to the loading complex of the mine, according to the claimed technical solution when dividing the layer by dip into the horizons between the blocks, the horizontal horizons of coal are left, the height H (m) of which is determined by the dip from the expression:

H≥ (2.1 ÷ 3.5) M,

where M is the removed reservoir thickness (m).

The specified technical result is also achieved by the fact that the horizontal pillars are erected artificially when preparing the excavation blocks for mining.

The proposed method is illustrated by drawings, where in FIG. 1 shows a diagram along the strike line of the formation, in FIG. Figure 2 shows a fragment of a section of the formation across the strike (section AA).

When developing powerful fire-hazardous steeply inclined coal seams, the seam is divided into layers by dip, each layer is worked out by dividing into mining blocks 1, while each mining block is limited by the width of the seam with interblock airtight jumpers 2 and by falling of the seam by the boundary of dividing the layers into horizons, beaten coal is delivered to the coal removal furnace 3 and then through the recoil drift 4 to the loading complex of the mine. When dividing the layer by dip into the horizons between the blocks, the horizontal horizons of coal 5 are left, the height H (m) of which is determined by the dip from the expression:

H≥ (2.1 ÷ 3.5) M,

where M is the removed reservoir thickness (m).

Inter-horizontal pillars 5 in other cases are erected artificially in the preparation of excavation blocks for mining.

Disclosure of the proposed method for the development of powerful fire hazard steeply inclined coal seams.

In underground mining, coal seams with a thickness of more than 3.5 m and an incidence angle of 35 ° ... 55 ° are classified as powerful steeply inclined. At the same time, with increasing power and angle of incidence under the influence of temporarily held collapsed rocks and the roof, compressive and shear factors in the stressed state of the coal seam array decrease. In this case, the shear strength of coal as a rock is approximately 30% of the compressive strength. Therefore, for powerful fire-hazardous steeply inclined coal seams, it is necessary to leave such horizontal horizons of coal, the height of which along the dip of the reservoir ensures that the integrity of their cores, which provides impermeability to air flows between the worked out space and, under the influence of temporarily held collapsed rocks and the roof, is guaranteed mine atmosphere in the working area of the excavation site. Boundary coefficients of 2.1 and 3.5 are set taking into account the margin of safety and can be adjusted if the geological conditions of the formation occur, and higher values are accepted for formations with a large angle of incidence.

For example, when mining a coal seam with an average thickness of 10 m with an average angle of incidence of 37 °, we obtain the height of the horizontal horizon on the fall:

H≥2.1 · 10 = 21 m

rounding which we can take H = 25 m.

When mining a coal seam with an average thickness of 11 m with an average incidence angle of 42 °, using interpolation inside the claimed interval, we obtain the height of the horizontal horizon on the fall:

H≥2.6 · 11 = 28.6 m,

rounding which we can take H = 30 m.

When mining a coal seam with an average thickness of 5 m with an average incidence angle of 50 °, we obtain the height of the horizontal horizon on the fall:

H≥3.5 · 5 = 17.5 m,

rounding which we can take H = 20 m.

If there is a filling complex at the mine with a cast hardening tab, the coal pillars can be replaced artificially erected in the process of preparing the extraction unit for the treatment recess.

The technical result of the proposed method is provided by the influence of essential features:

1) due to the left when dividing the layer in the fall between the blocks of the horizontal horizontal pillars of coal, air impermeability is achieved in the working area of the excavated section of the coal seam, the probability of air penetration into the exhausted space of the overlying horizon is reduced, and therefore the safety of mining powerful fire-hazard steeply inclined coal seams is increased;

2) due to the assignment of a fall height for interhorizontal pillars, taking into account the physicomechanical and mining and technical characteristics of powerful steeply inclined coal seams, the range of values of which guarantees the integrity of the cores of the above pillars sufficient to temporarily retain collapsed rocks and the roof, which also reduces the probability of penetration air into the waste space of the overlying horizon and, therefore, also increases the safety of mining powerful fire hazard steeply inclined ial layers.

Claims (2)

1. A method for developing powerful fire-hazardous steeply inclined coal seams, including dividing the seam into layers by dip, mining each layer by dividing into seizure blocks, each seizure block being limited by seam width with interblock airtight jumpers and, by seam fall, the boundary of dividing the layer into horizons delivery of beaten coal to a coal-blast furnace and then through a haulage drift to the loading complex of the mine, characterized in that when dividing the layer by dip into the horizons between the blocks, an inter-horizon is left ont pillars of coal, the height of H (m) of which is determined by the drop from the expression:
H≥ (2.1 ÷ 3.5) M,
where M is the removed reservoir thickness (m). 2. The development method according to claim 1, characterized in that the horizontal pillars are erected artificially in the preparation of excavation blocks for mining.

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