CN103233740A - Top-cutting roadway coal-pillar-free mining method of close-range thin coal seam - Google Patents
Top-cutting roadway coal-pillar-free mining method of close-range thin coal seam Download PDFInfo
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Abstract
The invention discloses a top-cutting roadway coal-pillar-free mining method of a close-range thin coal seam. The method comprises the following steps of: (1), excavating an upper crossheading roadway and a lower crossheading roadway; (2), mounting a grouting constant-resistance anchor rope and a grouting constant-resistance anchor rod without grouting at first, and a monomer hydraulic pillar, machining energy-accumulation presplitting top-cutting holes, and blasting to obtain presplitting cutting joints; (3), extracting an upper coal seam till unavailable; (4), allowing a mining field ejection plate to collapse along the shallow energy-accumulation presplitting cutting joints; (5), spraying a concrete spray layer to the rise side wall of the lower crossheading roadway, and grouting the grouting constant-resistance anchor rope and the grouting constant-resistance anchor rod; (6), extracting a lower coal seam till unavailable, and allowing the mining field ejection plate to collapse along the deep energy-accumulation presplitting cutting joints; (7), taking a roadway automatically formed at the original lower crossheading roadway as the upper crossheading roadway of a next mining surface; and (8), repeating steps (2) to (7). According to the method, by using the cutting joints formed by the energy-accumulation presplitting top-cutting holes for blasting the ejection plate, shallow breakage and deep breakage can be performed twice, and twice collapse of the mining field ejection plate is achieved.
Description
Technical field
The present invention relates to a kind of exploitation method of coal seam, especially with seam inclination between 0 °～10 °, seam mining thickness between 0.5m～1.3m, between adjacent two coal seams the distance relevant in seam mining method between 1.0m～5.0m and that be the closely girdle group coal wall under the tight roof condition.
Background technology
At present, have some closely girdles, its seam inclination is between 0 °～10 °, and seam mining thickness is between 0.5m～1.3m, and distance is between 1.0m～5.0m between adjacent two coal seams, and roof is tight roof.In order to improve fltting speed and High-efficient Production, to these closely girdle combine and adopt the promotion and application that obtain a greater number in China, and obtain good economic technology benefit.Because girdle normally occurs with coal seam group, and spacing is less between adjacent coal seam, mining influence is bigger mutually, therefore gob side entry will stand repeatedly the to dig up mine dynamic pressure effect of pressure when the back production of coal seam, therefore gob side entry destroys seriously, can't realize that the gob side entry when point blank multiple seam group exploits is safeguarded.At present the other lane mode of staying of building pack wall by laying bricks or stones in the lane of adopting can only realize the maintenance in tunnel when exploitation one deck coal seam, and distortion is bigger, can not realize the roadway maintenance when multiple seam is closely exploited, and particularly shares a tunnel during two-layer seam mining.Stay coal pillar mining and adopt and since repeatedly dynamic pressure influence disturbance, roadway maintenance is more difficult, in order to avoid the influence of back production dynamic pressure, coal column stays to be established size and just strengthens, and causes the wasting of resources, digging is than serious imbalance.Being that the lane is other builds pack wall by laying bricks or stones or stays coal column all fundamentally not realize release effect to top board, present method can not fine solution and is realized the closely no coal pillar mining under the tight roof condition of coal wall during the multiple seam exploitation of girdle, and reserved coal pillar can cause that coal and gas are outstanding, major disasters such as impulsion pressure, cause equipment damage and personnel's huge injures and deaths, potential safety hazard is huge.
The maintenance of gob side entry still can not realize not having the technical barrier of coal pillar mining when the present invention is directed to the exploitation of present girdle contiguous seams, has proposed new method.
Summary of the invention
At problems of the prior art, the purpose of this invention is to provide that a kind of gob side entry is stable, distortion is little, realize that no coal pillar mining and with low cost, safe closely girdle are cut and push up into the lane and do not have the coal pillar mining method.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of closely girdle is cut and is pushed up into the lane and do not have the coal pillar mining method, comprises the steps:
(1) the coal seam excavate two tunnels adopt as head face on gate road and following gate road, describedly go up gate road and following gate road two ends are interconnected by other two tunnels respectively;
(2) on the top board in described gate road down slip casting constant-resistance anchor cable is in place, but refuse slip casting, and in the following group side of described down gate road slip casting constant-resistance anchor pole is in place, but refuse slip casting, top board in the described down gate road one side of adopting face near described head is played the cumulative presplitting that the two-layer coal seam of a row shares and is cut apical pore then, and implement explosion formation presplitting joint-cutting, and adopt face one bogie side frame at close described head and establish the monomer liquid compression leg;
(3) back production is carried out in the coal seam, upper strata that described head is adopted face, until adopting sky;
(4) the stope top board collapses along superficial part cumulative presplitting joint-cutting;
(5) going up of described gate road down helped sidewall sprayed mortar spray-up, and described slip casting constant-resistance anchor cable and slip casting constant-resistance anchor pole are implemented slip casting;
(6) excavate new last crossheading, and back production is carried out in the lower floor coal seam that described head adopts face, until adopting sky, described lower floor seam roof collapses, and the described lower floor of described stope top board companion seam roof collapses along deep cumulative presplitting joint-cutting;
(7) with the last gate road of the automatic tunnel that forms, former gate road position down as next production face, and excavate the relatively upward following gate road of gate road, form new production face;
(8) repeating said steps (2)-(7) cut coal continuously, finish until this seam mining.
Further, in the described step (2), described cumulative presplitting is cut apical pore and is obliquely installed.
Further, the described concrete spray coating in the described step (5) is the thick C20 plain concrete of 50mm spray-up.
Further, in the described step (5), described slip casting constant-resistance anchor cable and slip casting constant-resistance anchor pole are implemented the two slurries slip castings of cement-sodium silicate.
Further, in the described step (7), also comprise and withdraw from described monomer liquid compression leg.
Beneficial effect of the present invention is, the present invention compared with prior art, cut the top board explosion joint-cutting that apical pore forms by cumulative presplitting among the present invention, can carry out the fracture in superficial part and deep at twice, collapse for twice that realizes the stope top board, in addition also by slip casting constant-resistance anchor pole, slip casting constant-resistance anchor cable and monomer liquid compression leg are reinforced with helping side down the lane inside ceiling panel in the following gate road, thereby avoided time crossheading top board to be destroyed, make former down gate road position automatic lane forming, be the last gate road continuation next round exploitation of next production face then with this tunnel, be continuous between per two production face, no coal column supports, and gob side entry is stable, be out of shape for a short time, can not cause that also coal and gas are outstanding, major disasters such as impulsion pressure, with low cost, safe.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described in further detail:
Fig. 1 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have production face structure schematic top plan view in the coal pillar mining method;
Fig. 2 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have that the production face master looks the sectional structure schematic diagram in the coal pillar mining method;
Fig. 3 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have in the coal pillar mining method structural representation after the coal seam back production of production face upper strata;
Fig. 4 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have in the coal pillar mining method production face stope top board along the superficial part cumulative presplitting joint-cutting backward structural representation that collapses;
Fig. 5 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have in the coal pillar mining method structural representation after the coal seam back production of production face lower floor;
Fig. 6 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have in the coal pillar mining method production face stope top board along the deep cumulative presplitting joint-cutting backward structural representation that collapses;
Fig. 7 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have slip casting constant-resistance anchor pole (rope) structural representation in the coal pillar mining method.
Fig. 8 cuts for a kind of closely girdle of the present invention and pushes up into the lane and do not have constant resistance and large deformation anchor rod structural representation in the coal pillar mining method.
The specific embodiment
The exemplary embodiments that embodies feature of the present invention and advantage will be described in detail in the following description.Be understood that the present invention can have various variations at different embodiment, its neither departing from the scope of the present invention, and explanation wherein and accompanying drawing be when the usefulness that explain in itself, but not in order to limit the present invention.
This method mainly utilizes cumulative presplit blasting to cut out a seam along the tunnel trend at the lane inside ceiling panel in the reservation large section roadway that two-layer coal seam shares, and this sewer has certain inclination angle and the degree of depth.Its inclination angle determines that through theoretical numerical computations and analog simulation experiment top board was cut top release effect requirement after the degree of depth must satisfy the back production of two-layer coal seam according to balkstone intensity, girdle mining height, and the degree of depth is also calculated through correlation analysis and determined.In the lane behind the joint-cutting, but namely the lane inside ceiling panel is implemented control devices such as the intensive hydraulic prop of the other enforcement shelves cash of the long anchor pole rope of slip casting constant-resistance and lane, the lane inside ceiling panel is supported, and along with the back production of first floor thin seam working surface, the stope top board is under the overburden pressure effect, collapse along the superficial part joint-cutting, adopt absolutely empty until filling, realize the support to overlying rock, realize stable, and then reduce the pressure of lane inside ceiling panel, safeguard stability of the roadway.After the first floor stoping low coal seam is intact, to tunnel processings of whitewashing, then the long anchor pole of slip casting constant-resistance is carried out slip casting, reinforce and recover to adopt for the first time the roadway surrounding rock that moves under using.Behind second layer stoping low coal seam, the stope top board collapses along deep joint-cutting generation secondary, and behind the stope roof caving, the extruding to roadway surrounding rock is pressed in the slow distortion that has reduced the later stage top board, realizes the stable of lane inside ceiling panel.The detailed process of method of the present invention is as follows:
(1) the closely girdle that adopts among the present invention is cut and is pushed up into the lane and do not have the coal pillar mining method, at first needs to form head and adopts face 1.As shown in Figure 1, the method that formation head adopts face 1 is identical with existing method, establish at the edge of seam mining and to exploit the position first, adopt S100A type comprehensive mechanized development machine to excavate two parallel tunnels 2 in this position, 3, two parallel tunnels 2,3 are communicated with by tunnel 4,5.Submarginal tunnel 2 is last gate road, is following gate road near the tunnel 3 of continuing production face 11.Each production face must form two tunnels, and last gate road 2 is the tunnels for transport of materials, and following gate road 3 is the tunnels for return air.
(2) as shown in Figure 2, the top board in following gate road 3 is installed slip casting constant-resistance anchor cable 61, and the degree of depth of constant-resistance anchor cable 61 is L, and only be in place slip casting constant-resistance anchor cable 61 this moment does not carry out slip casting.In addition, slip casting constant-resistance anchor pole 62 is installed at the place, non-coal seam of the following group side along the tunnel in 3 (near a side that continues production face 11), and only be in place slip casting constant-resistance anchor pole 62 this moment does not carry out slip casting.3 interior going up are helped side (side that close head adopts face 1) to play the shared cumulative presplitting in the two-layer coal seam of a row and are cut apical pore 7 along the tunnel then, and implement explosion formation presplitting joint-cutting, and this cumulative presplitting is cut apical pore 7 and had inclination alpha and degree of depth L '.Inclination alpha is according to stope balkstone intensity, girdle mining height and definite through theoretical numerical computations and analog simulation experiment, the stope top board was cut top release effect requirement after the degree of depth must satisfy the back production of two-layer coal seam, the degree of depth is also calculated through correlation analysis and is determined, can carry out superficial part fracture and deep fracture.
The concrete account form of inclination alpha is according to various internal friction angle of rock θ (table look-up and can get according to the rock composition), to obtain inclination alpha, α=π/4-θ; With this condition, can be convenient to realize the stope top board repeatedly collapse.
The degree of depth L ' that cuts apical pore 7 can calculate according to the degree of depth L of constant-resistance anchor cable 61, and the degree of depth L of constant-resistance anchor cable 61 will satisfy condition compared to the upwards anchoring section that the degree of depth L ' that cuts apical pore 7 will have more 1.5 meters at least:
L '=(L-1.5 rice)/cos θ
Each condition of difference substitution just can draw application data in the production.
Establish monomer liquid compression leg 8 at group's bogie side frame of adopting face 1 near head then, to support down the lane inside ceiling panel in the gate road 3.Monomer liquid compression leg 8 bottoms are fixedly installed on down on gate road 3 bottom surfaces, and top is supported by hydraulic coupling and leaned the lane inside ceiling panel.
In the multiple seam recovery process of girdle closely, since the stope top board collapse fall before, the outstanding dew of certain top board can appear, the outstanding Load Transfer of top board of revealing is in the tunnel, can increase the load of prop in the tunnel, general anchor cable is because extensible distortion is little, be difficult to adapt to the country rock large deformation that this pressure causes, very easily break, and because multiple seam exploitation, country rock is disturbance repeatedly, and after the primary excavation, primary excavation dynamic pressure meeting causes roadway surrounding rock the crack to occur, country rock intensity is reduced, need country rock is carried out grouting and reinforcing before second working, country rock intensity is recovered in the sealing crack, therefore adopt slip casting constant-resistance anchor cable 61 to reinforce among the present invention, the extendible advantage of large deformation high strength of performance slip casting constant-resistance anchor cable 61 can be carried out grouting and reinforcing to country rock by the grouting device on it again before the second working during primary excavation.
As shown in Figure 8, constant resistance and large deformation anchor rod is that the special a constant-resistance that can keep under the effect of buried heading immense pressure at buried heading design also keeps elongation and continuous anchor pole by mechanical carriage.Constant resistance and large deformation anchor rod comprises nut 601, ball pad 602, pallet 603, constant-resistance device 604, adapter sleeve 605 and the body of rod 606, constant-resistance device 604 is tubular structure, be set in the afterbody of the body of rod 606, pallet 603 and nut 601 are sleeved on the afterbody of constant-resistance device 604 successively, wherein the mid portion of pallet 603 is provided with a hole and passes for constant-resistance device 604, nut 601 is threadedly connected to constant-resistance device 604, the ball pad 602 of buffering is installed between nut 601 and the pallet 603, and adapter sleeve is installed in constant-resistance device 604 other ends.
When being applied to constant resistance and large deformation anchor rod in the heading, when the deformation energy of roadway surrounding rock exceeds the scope that anchor pole can bear, be provided with the constant-resistance device 604 of helicitic texture and anchor rod body 606 produces relative displacements by its bonding surface, also namely this anchor pole shows as the large deformation of radial drawing along with the country rock large deformation.After the country rock generation large deformation, its energy obtains discharging, and constant resistance and large deformation anchor rod still can keep constant working resistance after stretching, the deformation energy of country rock is less than the constant working resistance of constant resistance and large deformation anchor rod, constant-resistance device 604 restore to the original state and tightly be sleeved on the body of rod 606 time, the tunnel will be in stable state again, realize the stable of tunnel, eliminate potential safety hazards such as roof fall impact.Constant resistance and large deformation anchor rod bearing capacity 15～20KN, elongation all can reach 300～600mm, has bigger deformability to adapt to the large deformation ability of gob side entry.
When being applied to constant resistance and large deformation anchor rod in the heading, because constant resistance and large deformation anchor rod itself has very big extensibility, so can bear very big pretightning force, by the triaxiality loss that pretightning force compensation roadway excavation causes, realize that fast roadway surrounding rock is stable, and common bolt is because the anchor pole that can stretch when applying high pretightning force, consume the elongation of anchor pole, and itself elongation is very little, under the immense pressure effect of tunnel, will cause elongation not enough and disrumpent feelings.Constant resistance and large deformation anchor rod is owing to there is the elongation of 500mm, and the elongation abundance is not even under high pretightning force stretching and Tunnel Pressure double action, still can rupture the performance support action.
Slip casting constant-resistance anchor pole 62 is a kind of novel anchor rods that are different from slip casting constant-resistance anchor cable 61, slip casting constant-resistance anchor pole 62 is bar (rope) body 606 with 61 differences of slip casting constant-resistance anchor cable, structure as shown in Figure 7, the cable body of slip casting constant-resistance anchor cable 61 is the Mine anchorage cable steel strand of φ 15.24mm, and the body of rod 606 of slip casting constant-resistance anchor pole 62 is the vertical muscle threaded steel pipe of left-handed high-strength nothing.No longer introduce for the part identical with common constant resistance and large deformation anchor rod (rope), only to slip casting constant-resistance anchor pole (rope) 62(61) difference make an explanation: as shown in Figure 7, stop grouting plug 607 is used for preventing after slip casting is finished that the high-pressure slip-casting slurries run off, the expansile material of these stop grouting plug 607 usefulness is made, meet to expand behind the water and be full of grouting port, play only slurry effect; Rubber pad 608 is the compressible rubber pad that contains pore of an anti-extruding under the pallet 603, and main effect is to prevent that slurries from leaking along the slit between pallet 603 and the rock wall; Hole 609 is the boring of diameter 5mm, makes things convenient for injecting paste material to enter slip casting constant-resistance anchor pole (rope) 62(61 along hole 609) and jewel hole between hole, and under the effect of pressure, compress into the minute fissure of country rock, play the effect of reinforcing country rock.
Slip casting constant-resistance anchor pole (rope) 62(61) can be by the slip casting effect, reinforce the lane inside ceiling panel and help to collapse the loose spoil that falls on the gate road 3 down, by slurries with its gluing, form an integral body, like this under the slow crimp effect of later stage lane inside ceiling panel, can not crush and be scattering in the tunnel because of the pressure effect, play the effect of stablizing the tunnel.
(3) as shown in Figure 3, head is adopted the coal seam, upper strata of face 1 and carry out back production, until adopting sky, first outstanding revealing of top board of adopting face 1 of this moment.
(4) as shown in Figure 4, along with the coal seam back production is constantly pushed ahead, the outstanding top area of stope top board that head adopts on the face 1 strengthens, when pressure continues to be increased to certain value, namely collapse falls the stope top board along superficial part cumulative presplitting joint-cutting (i.e. the face that apical pore 7 forms than shallow portion is cut in row's cumulative presplitting), and be blocked in monomer liquid compression leg 8 outsides, finally be full of the goaf after, stop pressure and manifest.
(5) the group's sidewall of going up to following gate road 3 sprays the thick C20 plain concrete of 50mm spray-up, sealing country rock surface, and to the slip casting constant-resistance anchor cable 61 on the inside ceiling panel of lane and the two slurries slip castings of slip casting constant-resistance anchor pole 62 enforcement cement-sodium silicates of group's side down, country rock reinforced with intensity recover, after grouting pressure reaches 2MPa, stop slip casting.
(6) as shown in Figure 5, the head of gate road 2 inboards adopts and excavates a tunnel 21 in the face again on close former, as new last crossheading, and be communicated with tunnel 4,5, back production is carried out in the lower floor coal seam that head is adopted face 1 then, and until adopting sky, this moment, head adopted that face 1 lower floor's seam roof is outstanding to be revealed.After lower floor's coal seam back production finishes, it is unsettled that head adopts face 1 lower floor's seam roof, top pressure makes that adopting face 1 lower floor's seam roof collapses, and the stope top board is then adopted face 1 lower floor's seam roof in company with head and collapsed along deep cumulative presplitting joint-cutting (i.e. row's cumulative presplitting is cut apical pore 7 and divided the face that forms than the deep) generation secondary together.Be blocked in monomer liquid compression leg 8 outsides at the junk that collapses, and after finally being full of the goaf that head adopts face 1 lower floor coal seam, stopping pressure and manifest, as shown in Figure 6.
(7) when head adopt stope top board on the face 1 all collapse fall to finishing after, withdraw from monomer liquid compression leg 8.To descend crossheading 3 to remain by above effect, and as the last crossheading use of next work plane 11, and avoid reserved coal pillar and saved digging a tunnel again as the last crossheading of next work plane 11.Automatically the tunnel that forms with former down gate road 3 positions is as the last gate road of next production face 11 again, and excavates the relatively upward following gate road of gate road, forms new production face.
(8) repeat above-mentioned steps (2)-(7), cut coal continuously, finish until this seam mining.
After implementing this method, because top board has been carried out the explosion joint-cutting, therefore top board is in pre-fracture state, after the effect of stope roof pressure, top board just takes place to cut off along pre-faulted joint place and collapses, thereby the outstanding appearance of top board of having avoided the not pre-top board that ruptures to form is greatly long-pending, causes the big harm of prop active force in the tunnel.Because after pressure reduced, the stressed of prop reduced in the lane, rock is able to complete reservation in the lane, and it is good that the tunnel uses section to safeguard, has guaranteed the safety that the later stage uses.
Since implemented not stay the exploitation method of coal column, the other coal column that no longer is provided with in tunnel, and coal and the gas of therefore having avoided reserved coal pillar to bring are given prominence to harm, have improved the environmentAL safety of coal miner downhole operations greatly.Avoid the wasting of resources of staying coal column to bring simultaneously, saved resource, realized economic, safety, exploitation efficiently.
Further specify embodiments of the present invention with the example that is applied as at river mouth ore deposit 0245 work plane that reaches the bamboo affair subordinate of office below:
This work plane seam inclination 0～8 degree, long 164 meters of work plane tendency, move towards long 1050 meters, 600 meters of buried depths belong to Upper Triassic Xujiahe Formation coal, 0.6 meter of first floor coal mining height, second layer coal mining height 0.8m, work plane directly push up and are 1.2-2.0 rice medium hardness argillaceous sandstone, and directly pushing up top is that 5～7 meters thick sand shales are formed, adopt longwell retrusive fully-mechanized mining, top board adopts the caving method management.Wherein the machine lane is long 1050 meters, the special-shaped pre-big section of allowance, and the lane is high 2.5 meters, 4.4 meters of lanewidths.At duration of test, 1000 meters of twice back production of work plane, experience repeatedly the ore deposit press manifest after, be accumulated into 250 meters in lane, machine lane goaf side top board major part is cut the completion lane along CUMULATIVE BLASTING precracking with big block, lanewidth is all at 2.8 meters, and through field observation, lane group cuts spoil and is full of lane group and realizes connecing the top in adopting back 60 meters scopes, and tending towards stability gradually in the tunnel, occurs the wall caving of 20cm except group's side in 1000 meters tunnels that become the lane, top board and base plate convergent deformation average 32cm, in the lane and roadside support stressed evenly, constant-resistance anchor cable maximum weighted value 12.8t reaches the test objective of expection.
Beneficial effect of the present invention is, the present invention compared with prior art, cut the top board explosion joint-cutting that apical pore 7 forms by cumulative presplitting among the present invention, can carry out the fracture in superficial part and deep at twice, collapse for twice that realizes the stope top board, in addition also by slip casting constant-resistance anchor pole 62, lane inside ceiling panel in 8 pairs of following gate roads 3 of slip casting constant-resistance anchor cable 61 and monomer liquid compression leg is reinforced with helping side down, thereby avoided time crossheading 3 top boards to be destroyed, make former down gate road position automatic lane forming, be the last gate road continuation next round exploitation of next production face then with this tunnel, be continuous between per two production face, no coal column supports, and gob side entry is stable, be out of shape for a short time, can not cause that also coal and gas are outstanding, major disasters such as impulsion pressure, with low cost, safe.
Technical scheme of the present invention is disclosed as above by preferred embodiment.Those skilled in the art should recognize change and the retouching of doing under the situation that does not break away from the scope and spirit of the present invention that the appended claim of the present invention discloses, all belong within the protection domain of claim of the present invention.
Claims (5)
- One kind closely girdle cut and push up into the lane and do not have the coal pillar mining method, it is characterized in that, comprise the steps:(1) the coal seam excavate two tunnels adopt as head face on gate road and following gate road, describedly go up gate road and following gate road two ends are interconnected by other two tunnels respectively;(2) on the top board in described gate road down slip casting constant-resistance anchor cable is in place, but refuse slip casting, and in the following group side of described down gate road slip casting constant-resistance anchor pole is in place, but refuse slip casting, top board in the described down gate road one side of adopting face near described head is played the cumulative presplitting that the two-layer coal seam of a row shares and is cut apical pore then, and implement explosion formation presplitting joint-cutting, and adopt face one bogie side frame at close described head and establish the monomer liquid compression leg;(3) back production is carried out in the coal seam, upper strata that described head is adopted face, until adopting sky;(4) the stope top board collapses along superficial part cumulative presplitting joint-cutting;(5) going up of described gate road down helped sidewall sprayed mortar spray-up, and described slip casting constant-resistance anchor cable and slip casting constant-resistance anchor pole are implemented slip casting;(6) excavate new last crossheading, and back production is carried out in the lower floor coal seam that described head adopts face, until adopting sky, described lower floor seam roof collapses, and the described lower floor of described stope top board companion seam roof collapses along deep cumulative presplitting joint-cutting;(7) with the last gate road of the automatic tunnel that forms, former gate road position down as next production face, and excavate the relatively upward following gate road of gate road, form new production face;(8) repeating said steps (2)-(7) cut coal continuously, finish until this seam mining.
- 2. closely girdle as claimed in claim 1 is cut and is pushed up into the lane and do not have the coal pillar mining method, it is characterized in that in the described step (2), described cumulative presplitting is cut apical pore and is obliquely installed.
- 3. closely girdle as claimed in claim 1 is cut and is pushed up into the lane and do not have the coal pillar mining method, it is characterized in that the described concrete spray coating in the described step (5) is the thick C20 plain concrete of 50mm spray-up.
- 4. closely girdle as claimed in claim 1 is cut and is pushed up into the lane and do not have the coal pillar mining method, it is characterized in that, in the described step (5), described slip casting constant-resistance anchor cable and slip casting constant-resistance anchor pole is implemented the two slurries slip castings of cement-sodium silicate.
- 5. closely girdle as claimed in claim 1 is cut and is pushed up into the lane and do not have the coal pillar mining method, it is characterized in that, in the described step (7), also comprises and withdraws from described monomer liquid compression leg.
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