SU905496A2 - Method of protecting development working - Google Patents

Description

(54) METHOD OF PROTECTION OF PREPARATORY WORKS

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The invention relates to the mining industry and can be used for the protection of development workings in underground mining of mineral deposits with the laying of the worked-out space on deep horizons in difficult geological and geological conditions.

According to the main author. St. No. 735804 is known a method according to which to create local unloading from rock pressure, lava is worked out, the roof is controlled by complete laying, and in the middle of the developed area of lava in the area of subsequent generation, a section of 25-30 m wide is not laid; moreover, production takes place after compaction of the collapsed rocks. The mechanism of protection of the secondary generation discharge zone is that the influence of the development of cleaning operations adjacent to the discharge lava affects only the external discharge zone. This influence does not extend to the inner zone, since the rocks over the unencumbered area collapse and form a zone separated from the rest of the stratum 1.

However, studies have shown that this situation is true only for depths not exceeding 1000-1100 m with host rocks of medium stability. At horizons over 1100 m, the effect of the development of refining operations begins to affect the internal discharge zone, worsening the state of the protected preparatory development. This is especially manifested in weak, unstable host rocks and their high water cut.

JQ The purpose of the invention is to increase production stability while increasing the depth of development.

The goal is achieved by the fact that a section of lava, not laid by a filling material, is worked out after subsidence

15 overlying strata in the main part of the lava, worked out with the complete laying of the goaf.

FIG. 1 shows a diagram of the formation of an internal local discharge zone; in FIG. 2 is a schematic view of the location of the sewage disposal facility in lava.

The method is carried out as follows.

First, two lavas 1 and 2 are worked out with a full laying of the worked-out space, with the rear sight 3 remaining between them, as a result of which two zones of complete displacements 4 and 5 are formed.

Then, after subsidence of the undermined stratum of overlying rocks, they work out the inter-arch pillar section 3 with the complete collapse of the roof. As a result, zones 4 and 5 are combined into a common external zone of complete displacement 6, and on the basis of the spent rear sight 3 an internal localized discharge zone 7 is formed.

Example. It is necessary to create an internal unloading zone to protect the capital bias of the collapsed and compacted rocks at a depth of 1200 m. The host rocks are unstable, the strata are intensively broken by geological disturbances and flooded.

The lengths of lavas 1, 2, worked out with a full bookmark, are chosen of large sizes, for example, 200 m each. The interlegal pillar 3 is left with a width of 30-80 m. The smaller its width, the more reliable is the localization of the inner zone from rock pressure.

A side walk 8–1 passes along the fall. The distance between walkers 1 and 2, 3 and 4 is 200 m, between walkers 2 and 3 is 60 m. Then, lavas 1 and 2 are worked out with a full laying of the worked out space. In this case, passes 1 and 4 can be redeemed. With a lag of these lavas 1 and 2 (after settling of the undermined strata in lavas 1 and 2), lava 12 is worked out with a complete collapse of the roof. Capital slope 13 passes with a departure from the clearing of the bottom 12 (at a distance corresponding to no less than two months of its movement) in order to wait for the process of formation of the zone of complete displacements. Taking into account the high rate of movement of the short lava 12, to simplify the ventilation scheme, this lava can be worked out after the lavas have been completely exhausted and 2.

The main protection mechanism of the developmental mine, protected in the secondary discharge zone, is that

due to the rupture in time of the processes of the formation of external 5, 4 and internal 7 unloading zones (complete displacement zones), at their boundary, bends of the layers prevent the subsidence of the earned stratum above

internal unloading area 7.

According to this method, the outer zones of complete displacement 5, 4 are first formed. After working up the rear sill 3, the newly worked up zone 7, going down, encounters increased resistance to its movement from the side of the previously settled array. After working out the rear sight 3, wedging forces are created at the boundaries of the outer 5, 4 and inner 7 zones due to the earlier settling of the strata over the laid developed space.

This method of guarding preparatory workings ensures their stability at depths of over 1,100 m with the development of sewage works under difficult mining and geological conditions due to the maximum possible localization of the internal discharge zone in which production is located, as well as by increasing the total size of the developed space, since it is formed after working out at least 3

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Claims (1)

Invention Formula The method of protection of preparatory workings on the bus. St. No. 735804, characterized in that, in order to increase the sustainability of production with increasing depth of development, the section of lava, not laid by the backfill material, is worked out after subsidence of the overgrown strata of overburden in the main part of the lava, worked out with the complete laying of the developed space. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 735804, cl. E 21 F 15/00, 1977. BUT V & f) VOObf OC . d / g LI W / eleven / P I PROTECT oogo, gg Sfeolg l I Y / yy