RU2580124C1 - Method of creating protective shield in roof of designed mine works (versions) - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: presented group of inventions relates to methods of making protective screen designed in roof of projected mine workings. Feature of first version of method consists in drilling of wells is performed from one of two or two existing adjoining screened zone of mine workings, perpendicular or parallel projection respectively parallel adjacent to each other working at, pitch t between parallel geometrical axes of wells. Method according to second version consists in fact that in middle part of screened zone auxiliary mine perpendicular to projection parallel adjacent to each other working at or in one of diagonal directions screened zone. Drilling of wells is performed from auxiliary mine working, keeping pitch t between parallel geometrical axes of wells. Size of pitch t is determined depending on outer diameter of tubes-anchor, coefficient of attenuation factor structural rock on scale of M. M. Protodyakonov, bending resistance moment of cross section of pipe-anchor, permissible voltage of tube material bending-anchor, volumetric weight of rock being flight cleaning mine working, as well as angle of intersection of projections on screening plane geometrical axes of wells and designed mining of mine workings.

EFFECT: technical result consists in creation of protective shield with high screening surface in loose ores, which provides technological possibility and cost-effectiveness of driving of excavations in form of mining tapes; each version of method involves drilling in rock mass, at least one previously developed mine working of parallel wells and placing in drilled wells pipes-anchors.

10 cl, 25 dwg

Description

The group of inventions relates to underground construction, and in particular to methods of creating a protective screen in the roof of the designed mine workings, mainly in the form of mining tapes in the development of loose ores.

Known methods for creating a protective screen during the excavation of mine workings. In particular, a known method of tunneling according to the patent of the Russian Federation for the invention (RU 2301339, E21D 9/04, 06/20/2007). It includes pushing the massif of soil with a hollow extended element using a jack installation, core sampling, pressing the soil with the subsequent hollow element, sampling the core from it and joining the hollow elements. Interconnected hollow elements are the walls of the mine and at the same time serve as a protective screen.

The disadvantage of this known method is the limited use of rock strength and cross-sectional size of the mine to be protected (it is applicable for small tunnels designed to lay cable in soft soils of embankments or under embankments), and therefore cannot be used to screen mine workings significant cross section.

A known method of creating a tube injection screen above the tunnels and a device for its implementation according to the German patent for the invention (DE 3639891, E21D 9/00, 06/01/1988). The known method includes drilling from the bottom of the tunnel already passed inclined diverging wells in the roof of the projected development (the future part of the tunnel) and pumping cement slurry. Moreover, drilling and injection is carried out in one stage (simultaneously) using a device in which the discharge pipe is made of a perforated protective (casing) with bottom-hole shoe. The holes in the pipe are made conical with the expansion outward and covered with conical plugs. A drill pipe with a chisel is placed inside the perforated pipe. The casing and drill pipes are drilled into the columns during the drilling process using appropriate threaded joints. After drilling is completed, the drill string is removed from the perforated casing, and the latter remains in the well as an anchor. Well drilling is carried out with flushing or purging. If necessary (the presence of cracks in the rock mass), cement slurry is fed into the borehole zone through the openings of the casing, ajar.

The disadvantage of this method is the inability to create a common protective screen in the roof of the group of designed treatment workings in the form of mining tapes for the extraction of loose ores.

There is also a method of creating a tunnel or passage under existing structures, for example under a network of railway tracks, according to the US patent for the invention (US 4009579, E21D 1/04, 03/01/1977). This well-known method adopted as a prototype ensures the safety of ground structures in the passage zone and the protection of the bottom-hole part of the tunnel undergoing. It includes the creation of a protective screen in the roof of the designed tunnel by drilling horizontal parallel adjacent to each other wells from one of two previously dug open mine workings, orienting the geometric axis of the wells parallel to the geometric axis of the designed tunnel. Drilling is carried out without washing the drill pipe string equipped with a chisel and auger under the protection of the casing string, which, after removing the drill pipe string from it, remains placed in the well and serves as anchor pipes with their subsequent reinforcement (filling with concrete around the axial inside the cable). Then pass the tunnel with the mount. Such a screen has increased strength, but at a high cost of construction work. It is not economically acceptable for shielding individual treatment workings and is not feasible for shielding their totality in the form of production tapes.

The objective of the group of inventions is to develop such a method of creating a protective screen in the roof of the designed mine workings, which would make it possible to obtain shielding of a zone covering at the same time a number of parallel adjacent treatment workings (mining tapes) to be mined for the extraction of loose (prone to dumping from the roof) ores, account of rock pressure and strength parameters of ores and pipe anchors.

To solve the problem with the specified technical result, a group of inventions from two variants of the method is proposed depending on the possibility of using the existing mines (the first option) or the need for auxiliary mining work (the second option).

Each version of the method of creating a protective screen in the roof of the designed mine workings includes drilling in the rock mass from at least one previously completed mining of parallel wells using drill pipes equipped with a rock cutting element under the protection of casing pipes and placing anchor pipes in the drilled wells.

A distinctive feature of the first variant of the method is that the wells are drilled from one of two or two existing mine workings adjacent to the shielded zone, perpendicular or parallel to the parallel designed adjacent mining workings, maintaining a step t between parallel geometric axes of the wells , the size of which is determined by the dependence obtained as a result of a generalization of the correlation of the influence of rock pressure on arch formation in the mining heel in a known manner by prof. M.M. Protodyakonova (Rock pressure and mine fastening, M.M. Protodyakonov, part 1, Moscow: Gosgortekhizdat, 1930, 128 pp.) And design formulas of structural mechanics and theory of material resistance (Resistance of materials, N.M. Belyaev , Moscow: Nauka, 1976, 608 p.).

t = d + 6 · (k · f · W · [σ]) ^1/2 · γ ₀ ^-1/2 · b ^-1 · sin α, m,

where d is the outer diameter of the tube-anchor, m;

k is the coefficient of structural attenuation of rocks (k = 0.1 ... 1.0);

f - rock strength coefficient on the MM scale Protodyakonova (f = 1 ... 20);

W is the moment of resistance to bending of the cross section of the pipe-anchor, m ³ ;

[σ] - permissible bending stress of the material of the pipe-anchor, MN / m ² ;

γ ₀ - volumetric weight of the rock, kN / m ³ ;

b - span of the designed mine treatment mine, m;

α is the angle of intersection of the projections on the screening plane of the geometric axes of the wells and the designed mine workings (0≤α <90 °).

A distinctive feature of the second variant of the method is that in the middle part of the shielded zone pass auxiliary mining working perpendicular to the parallel designed adjacent adjacent mine workings or in one of the diagonal directions of the shielded zone, wells are drilled from the auxiliary mining, maintaining a step t between parallel geometric axes of wells, the size of which is determined by the dependence

t = d + 6 · (k · f · W · [σ]) ^1/2 · γ ₀ ^-1/2 · b ^-1 · sin α, m,

where d is the outer diameter of the tube-anchor, m;

k is the coefficient of structural attenuation of rocks (k = 0.1 ... 1.0);

f - rock strength coefficient on the MM scale Protodyakonova (f = 1 ... 20);

W is the moment of resistance to bending of the cross section of the pipe-anchor, m ³ ;

[σ] - permissible bending stress of the material of the pipe-anchor, MN / m ² ;

γ ₀ - volumetric weight of the rock, kN / m ³ ;

b - span of the designed mine treatment mine, m;

α is the angle of intersection of the projections on the screening plane of the geometric axes of the wells and the designed mine workings (0≤α <90 °).

In order to be able to control the load-bearing capacity of the created protective shield in the proposed method, the pipe anchors are filled with a hardening compound, and casing pipes are used as pipe anchors or pipe anchors are inserted into the casing pipes and then casing pipes are removed from the well.

To improve the quality of the protective shield by improving the penetrating ability of the grouting slurry into the rock mass in the proposed method, drilling is carried out with washing under the influence of variable hydrodynamic pressure on the borehole zone of the washing liquid with the addition of surfactants using a hydraulic vibrator mounted on drill pipes near the rock cutting element, and perforated pipes are used as anchor pipes and grouting is carried out through perforated anchor pipes first solution into the near-well zone of the rock mass after extraction of casing from wells.

To reduce the number of wells with a fixed size of the shield due to eliminating the concentrations of compressive stresses of the rock mass in the near-wellbore zone when drilling wells without washing, perforated pipes are used as anchor pipes, after which slotted unloading is performed in the casing in each well by cutting two parallel planes of screening of continuous slots with two rotary knives placed in longitudinal through windows of the head of the casing and displayed the knife rotation mechanism, which is installed instead of the rock cutting element of the drill pipes after removing them from the casing, and after cutting the cracks through the perforated pipe-anchors, grout cement is injected into the borehole zone of the rock mass.

The essence of the group of inventions is illustrated by drawings, where:

in FIG. 1 shows a method of creating a screen in the roof of the designed mine workings, a modification of the first option (the final screening stage when drilling was used from one of the two existing mine workings perpendicular to the designed mine workings), plan view of the screen;

in FIG. 2 the same - modification of the first option (the final stage of shielding, when drilling was used from two existing mine workings parallel to the designed mine workings), a plan view of the screen;

in FIG. 3 the same - modification of the second option (the final stage of screening, when drilling was used from the auxiliary mining worked out in the middle of the screened zone), the screen view in plan;

in FIG. 4 the same - section aa in FIG. 3;

in FIG. 5 the same - the layout of the pipe anchors of the protective screen in the roof of the designed mine workings;

in FIG. 6 the same - an intermediate stage of drilling a well with a string of drill augers (drilling without flushing), a vertical section;

in FIG. 7 the same - an intermediate stage of extracting drill pipe string with a bit from a drilled well, vertical section;

in FIG. 8 the same - an intermediate stage of introducing pipe-anchors into the casing string, vertical section;

in FIG. 9 the same - an intermediate stage of extraction of the casing string from the well, a vertical section;

in FIG. 10 the same - the intermediate stage of filling the pipe anchors with a hardening composition, a vertical section;

in FIG. 11 the same - an intermediate stage of drilling a well with flushing a drill string equipped with a hydraulic vibrator, a vertical section;

in FIG. 12 the same - an intermediate stage of extracting from the casing string of a drill string equipped with a vibrator, a vertical section;

in FIG. 13 the same - an intermediate stage of introducing perforated anchor pipes into the casing string;

in FIG. 14 the same is an intermediate stage of casing string extraction from a drilled well;

in FIG. 15 the same - an intermediate stage of injecting cement slurry into the borehole zone of the rock mass through perforated pipe-anchors;

in FIG. 16 the same - an intermediate stage of drilling a well without flushing with a casing string, the head of which is equipped with two rotary knives, a longitudinal section;

in FIG. 17 the same - an intermediate stage of extraction from the casing string of the drill string, longitudinal section;

in FIG. 18 the same - an intermediate stage of delivery to the bottom of the well with the help of a string of drill pipes of the mechanism for turning knives for cutting cracks, a section in the plane of the screen;

in FIG. 19 is the same - the stage of withdrawal from the longitudinal through holes of the knives for cutting slots (the head of the casing string with the knives turning mechanism located in it, general view with a partial longitudinal section);

in FIG. 20 the same - an intermediate stage of extraction equipped with a mechanism for turning the knives of the drill pipe string, a cut in the shielding plane;

in FIG. 21 the same - an intermediate stage of introducing perforated anchor pipes into the casing string, a section in the shielding plane;

in FIG. 22 the same - an intermediate stage of cutting cracks when removing the casing string with knives in the working position, a cut in the shielding plane;

in FIG. 23 the same - section bB in FIG. 22;

in FIG. 24 the same - the stage of injection of grouting mortar into the rock mass through perforated pipe-anchors, a section in the screening plane;

in FIG. 25 the same is the vertical cross section of the mine workings under the protective screen (intermediate stage of the development of treatment belts),

Where:

1 - a protective screen;

2 - the roof of the designed mine workings;

3 - mine treatment, for example in the form of parallel, adjacent to each other treatment belts;

4 - mountain range; 4a - ore trifle; 4b - near-well zone;

5 - wells; 5a - well conductor;

6, 7 - mine workings, from which wells perpendicular to mine workings 3 are drilled (option 1);

8, 9 - mine workings, from which wells are drilled parallel to mine workings 3 (option 1);

10 - contour of the shielded zone 11; longitudinal sections 10a, 10b and transverse sections 10b, 10g;

11 - shielded area;

12 - geometric axis of the wells 5;

13 - geometric axis of the designed mine workings 3;

14 - auxiliary development (option 2);

15 - drilling unit with 2 rotators 15a and 15b;

16 - drill pipe, 16a - drill string, 16b - drill auger;

17 - casing pipes, 17a - casing string, 17b - the head of the casing string;

18 - rock cutting element of the drill string 16A, for example a bit;

19 - casing shoe 17a, 19a - longitudinal groove of the shoe;

20 - pipe anchors interconnected by threaded connections (hollow),

20a - perforated pipe anchors;

21 - hardening composition for filling pipe anchors, 21a - cement slurry for injection into the borehole zone;

22 - hydraulic vibrator;

23 - flushing fluid with a surfactant;

24 - rotary knives, 24a - axis of rotation of the knives associated with the shoe 19 of the head part 17b of the casing 17a, 24b - the pre-working position of the knives (with the exit outward), 24c - rotary knives, tilted all the way to the working position;

25 - longitudinal through holes of the head part 17B of the casing string 17A;

26 - wire clips for securing rotary knives 24;

27 - the mechanism of rotation of the knives 24;

28, 29 - pairs of the rotation mechanism 27;

30 - hinge of the rotation mechanism 27;

31, 32 - short and long links of the rotation mechanism of the knives 27;

33 - hinge for connecting short links 31, 32 of the rotation mechanism 27;

34 - eye;

35 - a cylindrical head with a radial protrusion 35A (key);

36 - centering flange of the cylindrical head 35;

37 - eye;

38 - cylindrical tip;

39 - centering flange of the cylindrical tip 38;

40 - connecting part of the rotation mechanism under the coupling of the drill string 16a;

41 - jumper eyes 37;

42 - continuous slots in the mountain range 4;

43 - sand-cement mixture for laying treatment mine workings.

The method of creating a protective screen in the roof of the designed mine workings in accordance with the proposed group of inventions (options) is as follows.

Depending on the possibility of using the existing mine workings or the need for auxiliary mining workings, two variants of the proposed method have been developed.

The first option (Fig. 1 and 2) of the proposed method of creating a protective shield 1 in the roof 2 of the designed mine workings 3, for example, in the form of parallel adjacent adjacent mine workings (mining tapes) in the mountain massif 4, represented by loose (prone to dumping ) ore, includes drilling wells 5 parallel to each other from one of two existing mine workings 6, 7, perpendicular to the designed mine workings 3 (Fig. 1), or from two existing mine workings 8 and 9 (Fig. 2) parallel to the projected abatement mine workings 3. Mountain produce 6 (7), and 8 (9) parallel to the corresponding rectilinear portions of the shielded circuit 10 zones 11 - longitudinal 10a, 10b and 10c cross, 10g (relative to the workings 3). After shielding is completed, the created protective shield 1 coincides with the shielded zone 11. When drilling wells 5, in general, they ensure crossing (intersection of projections onto the shielding plane) of their geometric axes 12 and geometric axes 13 of the designed mine workings 3 at an angle α in the range determined by the inequality

In particular, in FIG. 1 α = 0 °, in FIG. 2α = 45 °.

Shielding plane, i.e. the plane containing the geometric axis 12 of the wells 5 is close to horizontal.

The second option (Fig. 3 and 4) of the proposed method for creating a protective screen 1 in the roof 2 of the designed mine workings 3 in the rock mass 4 includes drilling wells 5 parallel to each other only from auxiliary work 14 (Fig. 3). Excavation 14 takes place in advance in the middle of the shielded zone 11 perpendicular to the designed mine workings 3. The diagonal orientation of the auxiliary mine 14 is also possible: it takes place in one of the diagonal directions of the shielded zone 11 — p or q directions (Fig. 3). When drilling wells 5, their geometric axes 12 and geometric axes 13 of the designed mine workings 3 are crossed at an angle α = 0 ° (Fig. 3) or at an angle α ≠ 0 ° (with a diagonal orientation of the auxiliary mine 14).

Drilling wells 5 in both variants of the proposed method is carried out with a step t between their parallel geometric axes 12 (Fig. 5), the size of which is determined by the dependence

where d is the outer diameter of the pipe anchor, m;

k is the coefficient of structural attenuation of rocks (k = 0.1 ... 1.0);

f - rock strength coefficient on the MM scale Protodyakonova (f = 1 ... 20);

W is the moment of resistance to bending of the cross section of the pipe-anchor, m ³ ;

[σ] - permissible bending stress of the material of the pipe-anchor, MN / m ² ;

γ ₀ - volumetric weight of the rock, kN / m ³ ;

b - span of the designed mine treatment mine, m;

α is the angle of intersection of the projections on the screening plane of the geometric axes of the wells and the designed mine workings (0≤α <90 °).

For each variant of the proposed method for creating a protective shield 1, drilling techniques, including their modifications in terms of physicochemical effect on the rock mass 4, and in the type of drilling (without washing, with washing), by the type of anchor pipes (solid, perforated), by the presence reinforcing anchors (the introduction of hardening compounds and without them), to consolidate the borehole zone (injection of cement slurry or without it), are common. Therefore, a detailed consideration of the proposed method is sufficient to demonstrate the example of drilling a single well 5 (Fig. 6 ... 24).

The drilling of each well 5 in the rock mass 4 is carried out using a drilling unit 15 (Fig. 6), for example, a beam drilling rig ULB-130, as the most versatile drilling unit having two rotators 15a and 15b of drill pipes 16 and casing 17, respectively, and also means of their axial movement (not shown in the drawing). Drill pipes 16 are connected to the string 16a by locking joints with T-shaped leaf springs by axially moving and rotating them using the rotator 15a, and the casing 17 is connected to the string 17a by threaded connections using the rotator 15b. The drill string 16a is equipped with a rock cutting element 18 (for example, in the form of a chisel) and a screw 16b. The casing 17 a in the head is equipped with a shoe 19 having a longitudinal groove 19 a.

Drilling of wells 5 is carried out without washing or with washing.

Drilling wells 5 without flushing (Fig. 6) is carried out through the jig 5a by applying torques Μ ₁ and M ₂ , as well as axial forces F ₁ and F ₂ respectively to the drill and casing 16a and 17a, periodically increasing their lengths. In the process of drilling, the ore fines 4a, destroyed by the chisel 18 and shoe 19, are removed from the well 5 through the casing 17a by the screw 16b. When the design length of the well 5 is reached, drilling is stopped, the drill string 16a is removed from the casing 17a and the anchor pipes 20 connected to each other by threaded joints are inserted into the casing 17a (Fig. 8). Then, casing 17a is removed from the well 5 (FIG. 9). Thus, a protective shield 1 is obtained, where the rock mass 4 inside the shielded zone 11 is fixed with hollow pipes-anchors 20. Casing pipes 17 themselves (not shown) can be used as pipe-anchors.

If necessary, the bearing capacity of the protective screen 1 can be increased. Why fill the pipe anchors 20 with a hardening compound 21 (Fig. 10), for example concrete, by pumping with a concrete pump (not shown in the drawing) or casing 17, used as pipe anchors after removing drill pipes 16 from them (not shown in the drawing). Similarly, the remaining wells 5 are drilled in the shielded zone 11, and the anchor pipes 20 (filled with hardening compound 21) placed in them reinforce the rock mass 4 and serve as a protective shield 1 of the designed mine workings 3.

Possible modification of the proposed method when drilling wells 5 with flushing. In this case, the drill string 16a at the bit 18 is pre-equipped with a spool type hydraulic vibrator 22. Drilling of a well 5 is carried out (Fig. 11) with a rotating casing 17a and under the influence of a variable hydrostatic pressure (with a frequency of 10 ... 150 Hz) on the borehole zone 46 of the flushing fluid with the addition of a surfactant 23 using a hydraulic vibrator 22. Upon reaching the design length of the well 5 the drill string 16a with a hydraulic vibrator 22 is removed from the casing 17a (FIG. 12) and the perforated pipe-anchors 20a connected to each other by threaded connections are inserted into the casing 17a (FIG. 13). Then, the casing 17a is removed from the well 5 (Fig. 14), and after its extraction, the cement slurry 4a is injected into the borehole zone 4b of the rock mass 4 through perforated pipe-anchors 20a (Fig. 15).

It is also possible to modify the proposed method when drilling wells without flushing using slotted discharge. In this case, the head part 17b of the casing string 17a is equipped with two rotary (in one diametrical plane) knives 24 with rotation axes 24a associated with the shoe 19. (Fig. 16). The rotary knives 24 are placed in the longitudinal through holes 25 of the casing head 17b and are fixed with wire clips 26 (Fig. 19). After reaching the well 5 of the design length, the drill string 16a (Fig. 17) is removed and instead of the bit 18, a turning mechanism 27 of the knives 24 is installed and inserted into the casing 17a (Fig. 18), having previously deployed it in a position that ensures actuation in the shielding plane.

The rotation mechanism 27 (Fig. 19) is two identical pairs 28 and 29 connected by means of hinges 30 of rectangular section of the links 31 and 32 - short and elongated, respectively. The short links 31 are connected by hinges 33 with the eyes 34 of the cylindrical head 35 having a centering collar 36 and the radial protrusion 35a (key) for engaging with the longitudinal groove 19a of the shoe 19. The long links 32 are connected by hinges 33 with the eyes 37 of a cylindrical tip 38 having a centering flange 39 and a connecting part 40 (under the sleeve of the drill string 16A). The eyelet 37 is provided with a jumper 41 to limit the inadvertent oncoming rotation of the long links 32. When the cylindrical head 35 of the rotation mechanism 27 of the shoe 19 is reached, the drill string 16a is stopped and the casing 17a is turned and fed to the mouth, the groove 19a of the shoe 19 is aligned with the protrusion 35a. Then the drill string 16a is fed towards the bottom, it stops, and the cylindrical tip 38 continues to move, while the pairs 28 and 29 of the links 31 and 32 in the area of the hinges 30 press the knives 24, entering the through holes 25 of the shoe 19 of the casing 17a, breaking wire retainer 26 and turning them to the pre-working position 24b (with access to the outside), for a stroke of size S (until the eye 37 stops against the eye 34).

Then, drill string 16a with a pivoting mechanism 27 is removed from the casing 17a (FIG. 20). Then, perforated pipe anchors 20a connected to each other are inserted into the casing 17a (FIG. 21). Removing the casing 17a from the well 5, carry out slotted unloading by cutting with knives 24 (overturned with the shoe 19 to the working position 24c in the resistance of the rock mass 4) two continuous slots 42 in the rock mass 4 (Fig. 22 and 23) in the screening plane, parallel to the geometrical axes 13 of the designed mine workings 3 and located in their roof 2. Upon reaching the rotary knives 24 of the jig 5a, their axes 24a (not shown) are destroyed (for a given shear force), which ensures free and extraction of the head portion 17b of the casing string 17a from the conductor 5a. After removing the casing 17a through the perforated pipe-anchors 20a using a grouting pump (not shown), the grouting solution 21a is injected into the continuous slots 42 in the rock mass 5 (Fig. 24). Closure of slit 42 in the slab continuous shield 1 is projected mining 3. ceteris paribus plugging (cementation) crosshole space fractured rock wells may increase step is not less than 2 times, since according to the relationship (2) the ratio (k _max / k _min ) ^1/2 = (1.0: 0.2) ^1/2 = 2.24.

Under the protection of the screen 1 (Fig. 25), for example, created during drilling of wells from auxiliary mine 14, ore is mined using parallel adjacent mine workings 3 (production belts), passing at the beginning of generation 3 of odd numbering (3 ₁ , 3 ₃ etc.), i.e. with the left of the pillars, and subsequent laying, for example, a sand-cement mixture 43 (or using slag binders and sand and gravel aggregates). Then tested generate even-numbered 3 (3 _2, 3 _4, etc.), i.e. previously left pillars. To ensure the completeness of the bookmark development 3 usually pass with an angle of inclination to the horizon of 3 °. Therefore, such a slope also has a screening plane.

Using the proposed group of inventions allows you to create a protective screen with a large shielding surface in loose ores, which provides technological feasibility and economic feasibility of sinking workings in the form of mining tapes.

Claims (10)

1. A method of creating a protective screen in the roof of the designed mine workings, including drilling in a rock mass from at least one previously completed mining of parallel wells using a drill pipe equipped with a rock cutting element under the protection of casing and placing anchor pipes in the drilled wells, characterized in that the drilling of wells is carried out from one of two or of two existing adjacent to the shielded zone of the mine workings, perpendicular or parallel, respectively projected parallel adjacent adjacent mine workings, maintaining a step t between parallel geometric axes of the wells, the size of which is determined by the dependence

,
where d is the outer diameter of the tube-anchor, m;
k is the coefficient of structural attenuation of rocks (k = 0.1 ... 1.0);
f - rock strength coefficient on the MM scale Protodyakonova (f = 1 ... 20);
W is the moment of resistance to bending of the cross section of the pipe-anchor, m ³ ;
[σ] - permissible bending stress of the material of the pipe-anchor, MN / m ² ;
γ ₀ - volumetric weight of the rock, kN / m ³ ;
b - span of the designed mine treatment mine, m;
α is the angle of intersection of the projections on the screening plane of the geometric axes of the wells and the designed mine workings (0≤α <90 °). 2. The method according to p. 1, characterized in that after removing the drill pipe from the well, casing pipes are inserted into the casing and then casing pipes are removed from the well or casing is used as anchor pipes. 3. The method according to PP. 1 and 2, characterized in that the pipe anchors are filled with a hardening composition. 4. The method according to p. 1, characterized in that when drilling wells with flushing and the effect of variable hydrodynamic pressure on the borehole zone of the flushing fluid with the addition of surfactants using a hydraulic vibrator mounted on drill pipes near the rock cutting element, perforated pipes are used as anchors pipes and through perforated pipe-anchors produce cement grouting in the borehole zone of the rock mass after removing casing from wells. 5. The method according to p. 1, characterized in that when drilling wells without flushing and using perforated pipes as anchors, after they are placed in casing pipes in each well, slotted unloading is performed by cutting two parallel slots of the screening of continuous slots with two rotary knives placed in the longitudinal through windows of the head of the casing and brought out by the mechanism of rotation of the knives, installed instead of the rock cutting element of the drill pipe after removing them from the casing, and after cutting the cracks through the perforated pipe-anchors, grouting mortar is injected into the borehole zone of the rock mass. 6. A method of creating a protective screen in the roof of the designed mine workings, including drilling in a rock mass from at least one previously completed mining of parallel wells using a drill pipe equipped with a rock cutting element under the protection of casing and placing anchor pipes in the drilled wells, characterized in that in the middle part of the shielded zone pass auxiliary mining working perpendicular to parallel designed adjacent adjacent mine workings or in one of the diagonal directions of the shielded zone, drilling of wells is carried out from auxiliary mining, maintaining a step t between parallel geometric axes of the wells, the size of which is determined by the dependence

where d is the outer diameter of the tube-anchor, m;
k is the coefficient of structural attenuation of rocks (k = 0.1 ... 1.0);
f - rock strength coefficient on the MM scale Protodyakonova (f = 1 ... 20);
W is the moment of resistance to bending of the cross section of the pipe-anchor, m ³ ;
[σ] - permissible bending stress of the material of the pipe-anchor, MN / m ² ;
γ ₀ - volumetric weight of the rock, kN / m ³ ;
b - span of the designed mine treatment mine, m;
α is the angle of intersection of the projections on the screening plane of the geometric axes of the wells and the designed mine workings (0≤α <90 °). 7. The method according to p. 6, characterized in that after removing the drill pipe from the well, casing pipes are inserted into the casing and then casing pipes are removed from the well or casing is used as anchor pipes. 8. The method according to PP. 6 and 7, characterized in that the pipe anchors are filled with a hardening composition. 9. The method according to p. 6, characterized in that when drilling wells with flushing and the effect of variable hydrodynamic pressure on the borehole zone of the flushing fluid with the addition of surfactants using a hydraulic vibrator mounted on drill pipes near the rock cutting element, perforated pipes are used as anchors pipes and through perforated pipe-anchors produce cement grouting in the borehole zone of the rock mass after removing casing from wells. 10. The method according to p. 6, characterized in that when drilling wells without flushing and using perforated pipes as anchor pipes, after they are placed in casing pipes, slotted unloading is performed in each well by cutting two parallel slit shielding planes with two rotary knives placed in the longitudinal through windows of the head of the casing and brought out by the mechanism of rotation of the knives, installed instead of the rock cutting element of the drill pipe after removing them from the casing and after cutting the cracks through the perforated pipe-anchors pump cement slurry into the borehole zone of the rock mass.

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