RU1809075C - Method for sinking of vertical shafts - Google Patents

Abstract

Usage: when driving vertical trunks. SUMMARY OF THE INVENTION: the method includes preliminary drilling of a well, an explosion cavity is formed in the lower part of the well, then the well is expanded to the design dimensions of the wellbore, and the rock from the expansion of the well under the influence of gravitational forces is placed in the formed cavity, and the depth of the well must exceed the depth of the well by h determined by the formula Iv DCTB QCKB Opole H -Kr, m, where h is the excess of the depth of the well compared to the wellbore, m; N - trunk depth, m; DCTB barrel diameter, m; - well diameter, m; Opole - the diameter of the cavity formed, m; Cr is the coefficient of loosening of the rock.

Description

The invention relates to the field of mine construction and can be used for sinking vertical shaft shafts in the construction of new mines.

The purpose of the invention is to reduce labor costs, expand the scope and the creation of environmentally friendly technology for tunneling in the conditions of mine-construction sites.

The goal is achieved in that in the known method of penetrating vertical shafts, including preliminary drilling of the well, it is further provided that the cavity is formed in the lower part of the well by blasting and compacting the rock, then expanding the well to the design dimensions of the well and placing the rock from expanding the well in the formed cavity.

Such a sequence of production processes can significantly reduce the complexity of work, expand the scope of the combined method of vertical sinking

trunks, create environmentally friendly technology for driving the trunk.

Example. When a vertical shaft is drilled with a diameter of 6 m and a depth of 600 m, the following procedure for performing production processes is provided. Installation of an RTB-2.08 reactive-turbine drilling installation with the help of which it is possible to drill a well with a diameter of 2.08 m and a depth of up to 1000 m.

Based on the equality of the volumes of the cylindrical cavity Vi, located in the lower part of the well, and the rock volume V2 from the expansion of the well to the design dimensions of the wellbore, taking into account the loosening coefficient Kr 1.5, we can write the equality Vi V2 or

00

o y o

Xi

ate

ABOUT

floor

 f

P

with & in

) N -Kr,

h

DCTB - dcKB Opole

 N -Kr, m

(1)

(2)

where is Dnon2. -diameter of the cavity formed,, m;

h - excess depth of the well over the depth of the barrel, m;

N - trunk depth, m;

DCTB - barrel diameter, m;

claim 2 - well diameter, m;

Cr is the coefficient of loosening of rocks.

Knowing the depth of the trunk being constructed is 600 m, its diameter is b m, accepted. The diameter of the cavity formed is 20 m, according to formula (2) we determine the height of the cavity, i.e. excess of well depth over depth

(62-22 UbO 1.5 202

72m

Thus, it was found that the total depth of well drilling should be 672 m.

The required amount of explosives for the formation of the cavity is determined by the basis of efficiency, commutative exposure and specific consumption of explosives. To accommodate blasted rock when expanding a borehole with a diameter of 2 m to a design pit size of 6 m in diameter and 600 m deep, a cavity of 22 thousand m3 is necessary, for the formation of which we use Utonn waterproof explosive - rock ammonite No. 1 pressed. Said charge in the form of a dispersed charge is made on the surface, attached to a metal cable of a lifting winch with the help of which it is lowered into the lower part of the well, i.e. up to a mark of 672 m. In this case, the length of the dispersed charge corresponds to an excess of the depth of the borehole above the depth of the bore and is in this case 11 m. In order to prevent breakdowns of pieces of wade, the borehole is filled with clay mud, which during the explosion, i.e. during the formation of a cavity, it serves as a clog. An explosion is made and a cavity is formed, the volume of which is equal to the volume of the liquid column by which the surface of the clay mud filling the well will decrease. In case volume

0

5

0

5

0

5

the cavity formed is less than the volume of the rock from the expansion of the well to the size of the bore, blasting to expand the cavity can be repeated. Next, we proceed to expand the well with a diameter of 2 and up to the design size of the wellbore - with a diameter of 6 m using the blasting method according to the existing methodology. As the wellbore deepens, the clay solution is pumped out of the borehole by an amount equal to the advance of the face per cycle, the rest of the clay mud filling the borehole and the formed cavity acts as a lining - it supports the walls of the well and cavities from rock outfalls.

A rod shutter is located at the top of the borehole to regulate the descent of the rock in the borehole and to ensure the safety of borers working in the bottom of the borehole. The remaining tunneling processes (fastening, reinforcing, etc.) are carried out in the usual manner. SUMMARY OF THE INVENTION A method for sinking vertical shafts, including pre-drilling a well and expanding it to a design size, characterized in that, in order to reduce labor costs, expand the scope and create an environmentally friendly technology, they form a cavity after drilling the well before expanding by explosion, and the rock from the expansion of the well under the action of gravitational forces is placed in the formed cavity, and the depth of the well must exceed the depth of the wellbore by an amount determined according to the formula

P

C & B

C & B

P2 U floor

N -Kr, m

where h is the excess depth of the well compared with the wellbore, m;

N - trunk depth, m;

Ostv2 - barrel diameter, m;

dcKB2 - well diameter;

Opole2 — diameter of the cavity formed, m;

Cr is the coefficient of loosening of rocks.