RU1794997C - Method for draining open pits - Google Patents

Abstract

Usage: construction, work in flooded quarries. SUMMARY OF THE INVENTION: Drill upstream wells 6 from a mine 7 and downstream wells 3 on the ledges of quarries. Downstream wells 3 drilled with an excess below. The soles of each underlying ledge. In the quarry part 4 of the ledge, they are drilled to a depth of 25-30 m below the dynamic level of 2 groundwater. . The rock is crushed to form a drainage zone 5, which communicates with a rising well 6, which provides controlled groundwater discharge. Downstream wells 3 are hydraulically connected to each other and to the drainage zone 5. 1 sludge. ate

Description

FIELD OF THE INVENTION This invention relates to construction, and can be used when working in flooded quarries.

:; A known method of draining the slopes of soil structures, by. which is drained by forming channels and filling them with drainage material.

The disadvantage of this method is the complexity and lack of efficiency of drainage of open pits located in difficult hydrogeological conditions. The closest is a mine drainage method, which involves drilling uprising wells from a mine into solid aquifers, drilling downholes to form drainable zones by crushing the rock and bypassing the water.

The disadvantage of this method is the low efficiency, the inability to use it to drain the quarry.

The aim of the invention is to increase the drainage efficiency,

This goal is achieved by the fact that, in the drainage method, including the construction of rising wells from a mine, drilling downhill wells with the formation of drainage zones by crushing the rock and bypassing water, downhole wells are drilled in the under-quarry part of the ledge to a depth of 25-30 m below the dynamic level of the underground EOD, and the formed zone of crushing rocks is connected with the underground mining with the possibility of controlled drainage of underground waters, and downhole wells on the ledges of the quarries are drilled with an excess below each sole on the ledge and hydraulically

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They are connected to the crushing zone of the under-quarry part and to each other.

The drawing shows a section of a drained quarry.

The method is carried out as follows. :.

In the flooded section 1 of the ore block with an initial level of 2 groundwater, downstream 3 wells are drilled in a sub-quarry 4 part to a depth of 25-30 m below the dynamic level of 2 groundwater to create a rock crushing zone 5, which reduces water intake.

Drilling wells of 3 m depth in the lower part of the sub-quarry zone 4 and their subsequent blasting with the formation of a fractured zone allows creating a reservoir capacity that provides faster intake of water, does not interfere with production on the upper and lower ledges of the quarry, the height of which at the height of the ledge is 15 meters It will be 10-15 m, which is quite enough for the advanced intake of water from all horizons. Therefore, downhole drilling of less than 25 meters will not provide this capacity. Well depth of more than 30 meters is not advisable, because this will result in additional costs. :. ; :. ; ..; :: / ..-.,.

Wells 3 are charged with water-resistant explosives and create a crushing zone 5 of the rock by explosion. . - ..

The crushing zone 5 is connected by the uprising well 6 with the underground mining 7. The mouth of the uprising well 6 is equipped with the possibility of controlled water drainage. For this purpose, shutoff 8 and recording equipment 9 are installed at the wellhead b.

In the upper part, the rising well b is equipped with a filter 10, which is installed in the sub-quarry part; .

The downhole wells 11 on the ledges 12 are drilled with a margin of a equal to 2 ... 3 m below the sole 13 of each ledge and by loosening the rock are hydraulically connected to the crushing zone 5 and to each other.

In the presence of waterlogged areas, additional upstream trenches are arranged in the waterlogged areas. After the above operations, groundwater rushes to the lower part of the sub-quarry zone, and the groundwater level 14 decreases, forming a drained strip 15 close to the height of the ledge, which will allow mining of the quarry in the drained zone, as the groundwater level 4 is lowered to the mark sixteen.

Example p. To drain the prepared ore block, downhole blast holes were drilled on the ledges of the sides.

a quarry with a diameter of 250 mm and a depth of 16-18 m, and in the sub-quarry part to a depth of 25 m below the dynamic level of groundwater. : -: ...-. :. . ..:.;. : After installation in. charge wells

waterproof explosives exploded to crack and loosen the rock. Plots once; loose rock hydraulically interconnected, and in the absence of

in small areas of hydraulic communication, trenches were made with a cross section

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Block to be prepared for mining with an area of 50-60 m2, with a ledge height of 15 m

contained approximately 3,000 tons of ore. 10-12 blast holes were used to drill it. The cracks and pores formed during the explosion (up to 20%) created a container with a volume of about 150-180 m3 for water in the sub-quarry part. The useful capacity was 75-90 m, which ensured, approximately, the maintenance and regulated discharge of the dynamic water inflow 8.0 m3 / h, and taking into account atmospheric precipitation - up to 10.0 m3 / h.

All this ensured the maintenance of the drained zone on the ledges of the quarry and the lower part at a depth of 15-16 m.

The proposed method allows to ensure the efficiency of drainage pit with

the formation of the optimal depth of the drainage zone.

Formula A method of draining open pits, including drilling uprising wells from a mine and descending wells on the ledges of pits, crushing the rock with the formation of a drainage zone that communicates with the rising well, provides - draining regulated groundwater drainage, hydraulic connection of downhole wells with each other and with the drainage zone, characterized in that, in order to increase the drainage efficiency, - downstream wells on the mouth of the quarries are drilled with an excess below the bottom of each underlying his shoulder, and a shoulder portion podkarernoy their drilled to a depth of 25-30 m below the dynamic level of groundwater.