SU1453022A1 - Method of driving mine working - Google Patents

Abstract

The invention relates to mining and can be used in the excavation of mines using plugging of rocks. The purpose of the image / retention is to increase the safety of tunneling in watered hard rocks and reduce the amount of cement work. The method includes drilling from incisional wells 1 of inclined wells 8 beyond the border 7 of the hazardous water breakthrough zone and axial well 13, then creating a protective screen 12 by means of double-blasting the rock mass behind the production loop 1 and pumping cement slurry into it. After that, the rocks are drained, drilling and blasting of bore holes within the contour of the production and shipment of the rock mass from the bottom. A protective screen 13 is created around a zone that is prone to breakthroughs by successive formation of a side screen around the longitudinal axis of the excavation, drainage of the rocks and formation of the end part of the screen 12. Camouflage blasting of the rock mass is produced from the bottom part of the cement wells. The rocks are drained through an axial plugging well 13. 10 Il. (O (l fkiS sd o :) o nd is5

Description

The invention relates to mining, and in particular to methods of excavation of mine workings using the plugging of rocks.

The aim of the invention is to improve the safety of tunneling works in watered solid rocks and to reduce the amount of cementing works by layer-by-layer separation of the strength and anti-filtration functions of the zone between the mine working contour and the outer boundary of the protective screen.

FIG. 1 depicts a dangerous zone in terms of water breakthroughs; in fig. 2 is a diagram of the drilling of cement wells; in fig. 3 is a diagram of formation of a zone of increased fracture; in fig. 4 is a diagram of the injection of cement slurry into the wells; in fig. 5 is a diagram of the drilling of an axial well and the drainage of rocks; FIG. 6 is a diagram of the formation of an area

(Fig. 4) on the inner border of zone 9 of increased fracturing.

Using the complex of cement equipment 11, the cement slurry is injected (5, the preferred ways of movement of the solution are indicated by arrows) to the zone 9 of increased fracturing.

After hardening of the cement slurry, a lateral impervious screen 12 (rock permeability zone) is formed (Fig. 5), located around the longitudinal axis of the excavation 1 and covering the hazardous zone of water breakthrough 6. Then, from the underground excavation 1, they start drilling axially there - each well 13 beyond the boundaries of 7 (Fig. 6). The mouth of the axial well 13 is equipped with locking equipment and the conductor is hydro-tested. Through the axial well 13 is produced

ten

increased fracturing in the face-part-20 drainage of rocks within zone 6. ty; in fig. 7 - injection scheme there-after the drainage of rocks form zone 9

mortar in the axial borehole; increased fracturing (Fig. 6) in the end part by camouflage blasting; FIG. 8 - formed protective screen; in fig. 9 - excavation of mine workings; in fig. 10 shows section A-A in FIG. 9.

The method is carried out as follows.

The excavation of mine workings 1 is stopped in reservoirs (poorly permeable or drained) rocks 2 (Fig. 1) at a distance equal to the size of the barrier pillar 3, rebuilt from the watering hard rocks 4. Along the route 5, which is planned for mining the mine workings, they build up dangerous water breakthroughs

neither the near-wellbore part of the axial well 13, 25 extending beyond the boundary 7. The zone 9 of the increased fracture is formed so that it adjoins the impervious screen 12.

In the axial well 13 (Fig. 7), the injection interval of the cement slurry 30 is separated by installing a tampon 10 at the intersection of the well 13 of the contour 7 of the danger zone 6. Using the complex of the cement equipment 11, the injection of the cement slurry is made (the preferred route of the solution is shown

zone 6 with boundary 7 at a distance of 35 arrows) to zone 9 of the elevated cracks — the soles a, the roof a, and zaborozha production (Fig. 2). The size of zone 6, which is dangerous for water breakthroughs, can be determined by the same dependencies as the width of barrier pillar 3, taking into account structural weakening of rocks.

From the bottom of the mine workings 1, a fan of inclined cement wells 8 (Fig. 2) is drilled beyond the border 7 of the zone 6, which is dangerous for water breakthroughs.

40

innovation.

After hardening of the cement slurry in the zone 9, the end part of the impervious protective screen 12 is formed (the zone with a weak permeability of rocks, Fig. 8). Due to the abutment of the end part of the anti-seepage screen to its lateral surface 6 closed around the breakthrough hazardous zone 6 water.

The mouth of the cement wells 8 oboru- provide isolation from groundwater - - mine workings, planned for penetration in the flooded solid rocks. Under the protection of the screen 12, the excavation of the excavation 1 (FIGS. 9 and 10) is completed by drilling and blasting the knobs within

blow shut-off equipment and conduct hydraulic testing of conductors.

Then, the zone 9 of increased fracturing (Fig. 3) is formed by camouflage directional blasting of the bottomhole hole.

parts of the cement wells 8, leaving the contour of the development route 50 and beyond the boundaries of the border 7. The tamping wells 8 are positioned so that, after the explosion, the zone 9 of increased fracturing is continuous and closed along the lateral surface around the zone of the breakthrough water 6.

In the cement wells 8, the interval-injection of cement slurry is separated by installing tampons 10

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shipping shipment of slaughtered rock mass. The excavation of the mine workout 1 is stopped at a distance az from the end portion of the impervious screen 12.

If it is necessary to further excavate the mine, 1 cycle of work is repeated, using an artificially created barrier pillar, instead of a barrier target.

(Fig. 4) on the inner border of zone 9 of increased fracturing.

Using the cement equipment complex 11, cement slurry is injected (the preferred route of movement of the solution is indicated by arrows) to the zone 9 of increased fracturing.

After hardening of the cement slurry, a lateral impervious screen 12 (rock permeability zone) is formed (Fig. 5), located around the longitudinal axis of the excavation 1 and covering the hazardous zone of water breakthrough 6. Then, from the underground excavation 1, they start drilling axially there - each well 13 beyond the boundaries of 7 (Fig. 6). The mouth of the axial well 13 is equipped with locking equipment and the conductor is hydro-tested. Through the axial well 13 is produced

the drainage of rocks within zone 6. After the drainage of rocks form zone 9

of the bottom part by camouflage blasting of the near-bottom part of the axial well 13 extending beyond the border 7. The zone 9 of the increased fracturing is formed so that it adjoins the impervious screen 12.

In the axial borehole 13 (Fig. 7), the interval of injection of the cement slurry is separated by installing the tampon 10 at the intersection of the well 13 of the contour 7 of the danger zone 6. Using the complex of the cementing equipment 11, the injection of the cement slurry is performed (the preferred route of the solution is shown

arrows) to zone 9 of the increased cracks

arrows) to zone 9 of the increased cracks

innovation.

After hardening of the cement slurry in the zone 9, the end part of the impervious protective screen 12 is formed (the zone with a weak permeability of rocks, Fig. 8). Due to the abutment of the end part of the anti-seepage screen to its lateral surface 6 closed around the breakthrough hazardous zone 6 water.

provide isolation from the groundwater of the mine working scheduled for the production path and the subsequent

shipping shipment of slaughtered rock mass. The excavation of the mine workout 1 is stopped at a distance az from the end portion of the impervious screen 12.

If necessary, further excavation of mine workings 1 cycle of work is repeated, using artificially created barrier pillars instead of barrier pillars 3 in impermeable (low-permeable or dried) rocks 2 (Fig. 1).

The area between the contour of the excavation planned for the excavation and the outer boundary of the anti-seepage screen 12 is divided into two layers both by material composition and formation method, and by function. The first layer is represented by the actual filtration screen 12 formed by the formation in hard rocks of the zone 9 of increased fracture and the subsequent injection of cement slurry into it. The role of the anti-seepage screen 12 is to prevent the filtration of groundwater into the mine workings during its penetration. The impervious screen 12 transmits the hydrostatic pressure to the next layer. The second layer is represented by hard rocks between the mine workings and the inner boundary of the impervious screen 12. Its purpose is to accept the hydrostatic pressure and eliminate the destruction of the rocks under its action. Therefore, the parameters of the layer (ai, a2 and az) are calculated for strength.

Claims (1)

Invention Formula The method of excavation, including the drilling of advanced axial and inclined cement wells, creating a protective shield by camouflage blasting of the rock mass behind the production and injection circuit of the cement slurry, rock drainage, drilling and blasting holes within the contour development and shipment of broken rock mass from the bottom generation, characterized in that, in order to increase the safety of tunnel works in watered rocks and reduce the volume of cement works d by layer-by-layer separation of the strength and anti-filtration functions of the zone between the mine excavation contour and the outer boundary of the protective screen, the latter is created around the hazardous zone of water breakthroughs by successive formation of a side screen around the longitudinal axis of the excavation, drainage of the rocks and formation of the end part of the screen, while camouflage blasting the rock mass is produced from the bottom of the cement wells, and the rocks are drained five through the axial plugging hole. .one 8 8 7 a    BUT   F ".g Phie. J Yu Ф14г.