SU1444530A1 - Method of driving a mine working - Google Patents

Abstract

This invention relates to mine construction using artificial freezing. The purpose of the invention is to increase the safety of penetration by reducing the load on the lining. At a given section of the construction of a mine shaft, an even number of wells (C) 1 and 2 of the inner annular row, respectively, with odd numbers and even numbers to the depth of the first freezing stage h, is drilled. After that, remove the drilling tool. Every even with s

Description

(L

at

ate with

F1 / HL

C 2 along this row is deepened by the value of hj of the transition zone. The outer row of C 3 drill to the full depth H of the second stage. Equip C 1-3 respectively freezing columns (K) 4-6 to the full depth of drilled C 1-3. The coolant is supplied to K 4 and 5 from the brine network of the refrigeration station. An enclosed logging fence (LPO) 7 of the first freezing stage is formed. At the same time, in the transition zone, LB is formed of an open LPO 8, at the point of contact of the first and second stages of freezing around even C. With the protection of the LPO 7, the barrel is penetrated and the lining is installed while simultaneously supplying

one

This invention relates to mine construction using artificial freezing of rocks.

The aim of the invention is to reduce the loads on crepe.

Fig. 1 shows the phase of drilling the inner row of the first freezing stage and the outer row of wells of the second freezing stage, plan view; figure 2 is the same, the section aa in fig.1J on fig.Z - section bb in figure 2; 4 shows the phase of equipping wells with freezing columns, feeding into the internal row of coolants and forming the first-stage ice fence; on fig.Z - section bb In Fig "4; figure 6 - section GG in figure 4 | Fig. 7 shows the penetration of the trunk in the interval of the first stage, the installation of a support therein, the supply of coolant to the external row of columns and the formation of an ice-fence for the second stage of freezing; Fig, 8 is a section of DD in Fig.7; Fig.9 is a section of the EE of Fig.7.

The proposed method is carried out as follows.

On a given section of the construction of a mine shaft using known means of drilling an even number of wells 1 and 2 (Fig. 1) of the inner annular row, respectively, with odd numbers N, N ,, Ny ... and even numbers but a coolant in the outer row Kb, form a closed LPO of the second freezing stage. The height h is determined by the dependencies given in the description. Then the flow of brine in the transition zone is stopped, continuing the passive freezing of the first stage, the creation of second stage LPO and the further penetration and mounting of the trunk. The height of the transition zone is calculated by the so-called. 5 so that during the period of its penetration, and the mounting in the lower section on the height H - h, a closed ice-breed fence is also formed, which allows the stem to continue to penetrate to the full depth of N.. Silt .

measures N, N4, Ng ... to the depth of the first freezing stage h, then from each, for example, odd 1

(Fig.2) with numbers N, N.J, N5 -, .. extract the drilling tool, in each even 2 with corresponding numbers NI N4 NU.,. along this row (FIGS. 1, 2, 3) are deepened by the calculated depth

B transition zone. The outer row of wells 3 is drilled to the full depth H of the second stage (Fig. 2). Equip wells 1, 2, 3, respectively, freezing columns 4, 5, 6 (figure 4,

5) to the full depth of drilled

wells; columns 5, 6 are equipped with a device for zone freezing, connected to a refrigeration station (not shown). A coolant (an aqueous solution of calcium chloride) is fed into the wells of the inner row in columns 4 and 5 from the brine network of the refrigeration station. At the same time, a closed ice fence 7 (figs, 4 and 5) of the first stage of freezing and in the transition zone is formed

Jij, open ice fence 8, formed at the point of contact

the first and second stages of freezing around even wells. Under the protection of an enclosed ice-guard fence 7, the shaft 9 is mounted and the support 10 is installed (Fig. 7), while simultaneously supplying coolant

314445304

external row of columns 6, forming a lock-depth transition zone h

The frozen ice fence 11 of the second stage of freezing (Fig.7.8),

The height of the transition zone b „h, depends on

- h) 2

R

t

Ifcp-r

de P

HI

G.

R

C2

R

ci

the magnitude of the horizontal pressure at the depth of the upper part of the transition zone, Pa;

the long-term strength of frozen rocks at the depth of the upper part of the transitional radius of the circumference of the location of the freezing columns of the second freezing stage, m; 25 radius of penetration in the tunnel, m;

the radius of the circumference of the freezing columns of the first stage of freezing-30 frosting is deepened by

live, m;

(Ti is the limit of long-term strength of frozen rocks at the depth of the lower part of the transition zone. Pa ;. - average volume weight of rocks

transition zone - the lateral pressure coefficient of the thawed rock of the transition zone.

A closed ice-breeding constraint 11 (Fig. 7) is formed faster than in the lower zone 11, and at a height (H-h,). This allows accelerating the penetration of the shaft 9. The height of the transition zone hf is calculated so that during the period of penetration and fastening in the lower section at the height (H - h,), a closed ice-breed fence 11a is also formed (Fig.9), which allows lead the nonstop shaft 9 to a full depth N. In the transition zone b & a, an ice fence 11 is formed with an undulating form of the inner surface 12 (Fig. 8) having compliance in the tangential direction due to the zones of talc sections 13. After the formation of closed ice pens single fence on

depth of transition zone h

O

five

0 5

filing

the coolant in the inner row of columns is stopped by passively freezing the ice-guard fence 7 to a height h, further penetrating and fixing the trunk.

Claims (1)

Invention Formula The mining method of drilling, including the drilling of internal and external annular rows of wells, the extraction of drilling tools, equipping wells with freezing columns, supply of cooling brine and the creation of ice barriers by freezing the rocks of the upper stage, and the lower part - an external row of second-stage columns with the formation of a transition zone, the subsequent passive freezing, excavation of rocks, and the fixing of excavation, characterized in that pretensioners penetration by reducing the loads on the supports, every even row of the inner hole of the first stage of the transition zone, and the creation of a closed ice fence of the first stage is carried out with the simultaneous formation of open ice cylinder cylinders in the transition zone, then the outer row of columns closes the fence in the transition zone, after which the brine in the transition zone is stopped, continuing passive freezing the first stage and creating an ice stage of the second stage, and the height of the transition zone h is determined by . 50 Where pressure at the depth of the upper part of the transition zone, Pa; J ri - the limit of long-term strength of frozen rocks at the depth of the upper part of the transition zone. Pa; 51444530 - radius of the location of the freezing columns of the second stage of freezing, m; -radius of development in penetration, m; - radius of the location of the freezing columns of the first freezing stage - Q of living, m; r the long-term strength of frozen rocks at the depth of the lower part of the transition zone, Pa; - average volume weight of rocks of the transition zone, N / m; - lateral pressure coefficient of thawed rock of the transition zone. / I- / I FIG. 2 5 B 6 Aa in to 5. - Fig l