CN102337904A - Method for retaining gob-side tunnel - Google Patents

Method for retaining gob-side tunnel Download PDF

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Publication number
CN102337904A
CN102337904A CN2011102670502A CN201110267050A CN102337904A CN 102337904 A CN102337904 A CN 102337904A CN 2011102670502 A CN2011102670502 A CN 2011102670502A CN 201110267050 A CN201110267050 A CN 201110267050A CN 102337904 A CN102337904 A CN 102337904A
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China
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pier stud
gob
lane
tunnel
concrete
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CN2011102670502A
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Chinese (zh)
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CN102337904B (en
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贾民
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贾民
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Publication of CN102337904B publication Critical patent/CN102337904B/en

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Abstract

The invention discloses a method for retaining a gob-side tunnel, which overall arranges the retaining of the gob-side tunnel in a stope working face gateway tunneling period, and comprises the steps of: combining the stope working face gateway with the gob-side retained tunnel, namely the next section gateway, together to be served as one tunnel for tunneling; and constructing tunnel concrete pier columns between the stope working face gateway and the gob-side retained tunnel, wherein the tunnel concrete pier columns are served as support in the tunnel and also served as one part of the side support for the gob-side retained tunnel; namely comprising the steps of: widening the section of the tunnel by tunneling, reserving the tunnel section according to the shrinkage factor of the god-side retained tunnel suffering from two times of support pressure, and pouring the reinforcing steel bar concrete pier columns in middle of the transverse direction of the tunnel to match with a cable anchor for supporting. The tunnel concrete pier columns are arranged along the whole length of the tunnel at intervals, and used for dividing the tunnel into two parts. Insulating walls are constructed between two adjacent columns after the columns are constructed. When the stope is starting, the support is needed to be temporarily reinforced at two sides of the columns according to requirements along with the advancing of the stope working face. According to the method for retaining a gob-side tunnel, the retaining of the gob-side tunnel and the tunneling of the stope working face gateway are overall arranged, and the tunnel concrete pier column support is arranged; therefore, the side support intensity and support resistance of the retained tunnel are greatly enhanced, the influence of support pressure in two times of mining is effectively controlled. The method for retaining gob-side tunnel is particularly suitable for using in flexible mining faces of bottom plate and/or top plate.

Description

The method of gob side entry retaining
Technical field
The present invention relates to coal mine gob-side entry retaining technology, particularly a kind ofly be about to adopt the method that face crossheading and gob side entry retaining make overall arrangements and adopt the gob side entry retaining of concrete cast supporting at stope crossheading phase of boring.
Background technology
For the loss of coal pillar that reduces between transportation of coal mining section and track crossheading adopts no coal pillar mining, promptly keeping the coal crossheading along the goaf is that the service of next section stope is called gob side entry retaining, also claims multiplexing tunnel abroad.
China's " Gazette of Patent for Invention " discloses title: the invention application of " method of support along spatially keeping lane ", application number: 200710026096.9, publication number: CN 101117890A.Its objective is the supporting problem that solves gob side entry retaining; Its measure is to pass with work plane, and one side is installed filling mould pouring concrete in the goaf, constructs lane group obturation and forms the roadside support band.Existing problems are: pour concrete is constructed lane group obturation and is wanted form removal, no integral movable type filling mould; Pour concrete lane group obturation, goaf side does not have reinforcement temporary lining.
China discloses title " Gazette of Patent for Invention " on December 08th, 2010: the invention application of " gob-side entry retaining support method and notes lane sliding formwork thereof ", application number: 200710015658.X, publication No.: CN 101906979A.Its objective is provides a kind of filling mould that saves to install and remove operation, adopt dedicated integral to draw decant(-ation) lane sliding formwork; Pour into a mould the roadside packing wall, and add temporary lining in back production face support back, goaf one side.Shortcoming is: mutual interference is big mutually with the stope coal mining to pour into a mould the roadside packing wall at the back at stope.
The edge air gallery technology that in the past adopted, the supporting mentality of designing is unreasonable, mostly with staying the lane separate after tunnelling before the stope back production and the back production; Do not consider as a whole; Gob side entry retaining is not regarded as a system engineering, as before the tunnelling that needs are kept, when carrying out selection of roadway support form and supporting parameter design; Do not consider the needs of later stage edge air gallery technology in advance; Thereby cause prop intensity in the gob side entry retaining rear lane can not satisfy that supporting and roadside support do not match in the requirement, lane of twice mining influence, make and stay the lane effect not reach re-set target, even failure.
Summary of the invention
In order to overcome staying the separate requirement of not considering as a whole, can not satisfying twice mining influence in lane, stay the lane effect not reach the deficiency of expection after the crossheading driving of prior art before and the back production with the stope back production; The present invention provides a kind of gob-side entry retaining method; It is about to the crossheading of the face of adopting and the gob side entry retaining after the back production is done overall arrangement at stope crossheading phase of boring; The needs of later stage gob side entry retaining are just considered in advance in the driving beginning in tunnel to needs keep; Improve the intensity and the supporting resistance of gob side entry retaining roadside support body greatly, satisfy the requirement of twice mining influence; And avoid gob side entry retaining roadside support and stope operation mutual interference mutually.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of method of gob side entry retaining; Crossheading phase of boring at stope; Promptly gob side entry retaining is made overall arrangements: with the crossheading of stope and gob side entry retaining be the adjacent crossheading that next section is adopted face unite two into one, as a tunnelling; Construct " concrete pier stud in the lane " supporting between the two, it is not only as supporting in the crossheading lane but also as the part of gob side entry retaining roadside support body; That is: widen the digging laneway section, and reserve the drift section area according to the shrinkage factor that gob side entry retaining stands twice bearing pressure effect, the casting reinforced concrete pier stud in horizontal middle part i.e. " concrete pier stud in the lane " cooperates the anchor rete cord supporting in tunnel in the tunnel.To stopping adopting line along the alternate layout of digging laneway total length, digging laneway " is divided into two ": a side is that the crossheading opposite side is a gob side entry retaining to the concrete pier stud from the stope open-off cut in the lane.After the concrete pier stud is constructed in the lane, in the lane, construct between the concrete pier stud " divider wall ".The concrete pier stud is connected, constitutes jointly the roadside support body of gob side entry retaining in divider wall and the lane.
The invention has the beneficial effects as follows:
1. cancel section coal pillar, realize no coal pillar mining, improve the rate of extraction, make full use of coal resources.
2. dig a tunnel less, reduce coal-face time, alleviate the digging anxiety that continues.
3. concrete is poured into a mould roadside support body rigidity height, closely knit good, but both the lane was stayed in the roof supporting maintenance, can isolate the goaf again, and is favourable with the improvement ventilation to reducing spontaneous fire, helps Safety of Coal Mine Production.
4. the pumping cast reduces labour intensity, improves work efficiency; Simple to operate safe and reliable.
On above-mentioned gob side entry retaining of reservation and pumping concrete cast roadside support advantage basis, also have following advantage:
1. combine the gob side entry retaining after crossheading driving and the back production of adopting before the face back production and consider as a whole; Gob side entry retaining is regarded as a system engineering; The needs of later stage gob side entry retaining are considered in tunnel to needs keep in advance before driving, and through establishing this powerful supporting cooperation anchor rete cord supporting of concrete pier stud in the lane, supporting in the lane, gob side entry retaining roadside support intensity and supporting resistance are improved greatly; Control direct top absciss layer; Reduce to adopt for twice the influence of the bearing pressure superposition that causes, utilize than soft seat, the incompatible problem that overcomes that the supporting resistance that traditional roadside support exists is little, contractibility is little etc. with staying lane surrouding rock deformation or/and top board solves the contractibility problem.
2. adopt thin-walled steel cylinder concrete pier stud further to improve pier stud supporting intensity and supporting resistance, reduce shared drift section area.To solve deep soft rock and area of stress concentration supporting, the bump problem is significant.
3. advance with the face of adopting to add strong supporting temporarily, further reduce the influence of adopting the bearing pressure superposition that causes for twice, reduce the gob-side entry retaining support load and the contraction percentage of area.Employing has the self-advancing hydraulic support supporting of " anchor shaft anchor cable is dodged protection mechanism ", can prevent that Anchor cable-rod is damaged.
4. can avoid the concrete cast to stay lane roadside support body and the face stoping operation of adopting mutual interference mutually, improve work efficiency greatly.
Description of drawings
Fig. 1 be in the method lane of gob side entry retaining of the present invention the concrete pier stud at sketch map, the A-A profile of digging laneway.
Fig. 2 is concrete pier stud, the divider wall layout sketch map in digging laneway in the lane.
Fig. 3, the 4th, pier stud die assembly integral installation distribution structure sketch map.
Fig. 5, the 6th, the structural representation master of the clip of pier stud die assembly looks, vertical view.
Fig. 7, the 8th, the structural representation master of the upper end mould of steel cylinder mould looks, vertical view.
Fig. 9, the 10th, the structural representation master of upper end reinforcing cage looks, vertical view.
Figure 11, the 12nd, the structural representation master of lower end reinforcing cage looks, vertical view.
Figure 13, the 14th, the structural representation master of the lower end mould of steel cylinder mould looks, vertical view.
Figure 15 is the rack arrangement floor map that fully mechanized coal face begins to add after the back production strong supporting temporarily.
Among the figure: the 1-gob side entry retaining; Concrete pier stud in the 2-lane; The 3-haulage gate; The 4-anchor pole; The 5-anchor cable; The 6-divider wall; 7-upper end mould; 8-upper end reinforcing cage; 9-lower end mould; 10-lower end reinforcing cage; The 11-clip; Link under the 12-; The last link of 13-; The 14-grouting port; The 15-bolt; 16-upper end cylinder; The 17-centring ring; The 18-longitudinal reinforcement; The 19-steel ring; 20-reinforced bar jointing sleeve pipe; 21-lower end cylinder; The 22-peep hole; 23-stope rib; The 24-working surface hydraulic support; The 25-goaf; The Yi Ziliang that the 26-hysteresis adds strong supporting adds individual prop; 27-automatic moving type rail is along hydraulic support; 28-automatic moving type fortune is along hydraulic support; 29-adds a word beam individual prop of strong supporting in advance.The concrete pier stud is called for short pier stud in the lane; Stope is called for short the face of adopting; Digging laneway is called for short the pick lane; The gob side entry retaining abbreviation stays the lane; It is suitable that haulage gate is called for short fortune; It is suitable that the track crossheading is called for short rail.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
The country rock of gob side entry retaining experiences five stage: I digging stages altogether, II pick back stabilization sub stage, III stabilization sub stage, V mining influence stage for the second time behind mining influence stage, the IV mining influence for the first time.What wherein deflection was maximum is the III stage, and key area is again to adopt the face rear.This tunnel, place one side is a coal group, and opposite side is the inbreak spoil, and is similar with the section of stope across pitch.The III stage of gob side entry retaining, when old top come pressure strong, when sedimentation is violent, the ore deposit, tunnel is pressed and to be manifested strong, rock deformation is big.Except that old top strenuous exercise period, the surrouding rock stress of gob side entry retaining changes slowly.
Stay the lane to combine to consider as a whole, gob side entry retaining is regarded as a system engineering after the crossheading driving of the method for gob side entry retaining of the present invention before and the back production the stope back production.Crossheading phase of boring at stope promptly begins to take measures to prepare for gob side entry retaining.Usually, gob side entry retaining technology all is with the haulage gate of stope, is left gob side entry retaining, makes the track crossheading of next section stope.
The concrete practice of the method for gob side entry retaining of the present invention is; Haulage gate phase of boring at stope; Promptly gob side entry retaining is made overall arrangements: with the haulage gate of stope and gob side entry retaining be the track crossheading that next section is adopted face unite two into one, as a tunnelling, construct " concrete pier stud in the lane " supporting between the two; The concrete pier stud is not only as supporting in the haulage gate lane but also as the part of gob side entry retaining roadside support body in the lane.That is: widen the digging laneway section, and reserve the drift section area according to the shrinkage factor that gob side entry retaining stands twice bearing pressure effect, the casting reinforced concrete pier stud in horizontal middle part i.e. " concrete pier stud in the lane " cooperates the anchor rete cord supporting in tunnel in the tunnel.In the lane concrete pier stud from the stope open-off cut to stopping adopting line along digging laneway total length, alternate layout.After the concrete pier stud is constructed in the lane, in the lane, construct between the concrete pier stud " divider wall ".The concrete pier stud is connected in divider wall and the lane, constitutes the roadside support body of gob side entry retaining jointly.
One. concrete pier stud and divider wall constructing in digging laneway in the lane:
Concrete pier stud and the deployment scenarios of divider wall in digging laneway in the lane of the method for Fig. 1, gob side entry retaining of the present invention shown in 2.The section of digging laneway shown in the figure is a right-angled trapezium; In the horizontal centre of digging laneway concrete pier stud 2 in the lane is set; From adopting the face open-off cut to stopping adopting between the line, and in the lane, construct divider wall 6 between the concrete pier stud 2, digging laneway " is divided into two " from horizontal centre along the alternate layout of digging laneway total length; The right side is the haulage gate 3 of stope, and the left side is that gob side entry retaining 1 is the track crossheading that next section is adopted face.Back has anchor pole 4, anchor cable 5, and anchor pole 4 has been helped in tunnel two.Anchor pole 4, anchor cable 5 constitute the supporting of anchor rete cord with anchor net, supporting steel band.Concrete pier stud 2 and divider wall 6 and the common supporting roof of anchor rete cord in the lane.The anchor pole 4 that double dotted line is represented among Fig. 1 is to be exclusively used in the anchor pole of hanging monorail crane.The divider wall 6 that double dotted line is represented among Fig. 2 is back benefit divider walls of once making pedestrian's vent passages; The sensing of section A-A is to point to from inside to outside from open-off cut.
The key issue of gob side entry retaining is to select effective roadside support material and supporting method.Under the pressure effect of huge ore deposit, the gob side entry retaining shrinkage factor is very big, and drift section is not reserved to shrink and is difficult to guarantee to adopt the face ordinary production.Reserve certain cross-sectional area during digging laneway, make need not keep in repair behind the compressive deformation of tunnel and just can continue to use.The target of gob side entry retaining is, after the effect distortion that stands twice bearing pressure, makes and stays the lane still can realize " disposable supporting ", promptly need not keep in repair at viability and continue to use, and guarantees to adopt the face ordinary production.
Since driving stope haulage gate be with gob side entry retaining be the track crossheading that next section is adopted face unite two into one, as a tunnelling; So the digging laneway section will be widened to and be approximately the haulage gate width and add the width that next section is adopted face track crossheading.When widening drift section, consider that gob side entry retaining stands the shrinkage factor of twice bearing pressure effect, reserve certain drift section area according to shrinkage factor.Consider that simultaneously when adopting the face transportation service, gob side entry retaining one side also can be utilized, for adopting the face service in haulage gate one side, so the drift section of haulage gate one side suitably reduces can be than independent driving haulage gate the time.Scope after drift section is widened: 5000mm~7000mm.Preferably select for use the development machine of wide section once to dig.
2. from adopting the face open-off cut when stopping adopting line and along the lane, arrange pier stud, whenever reserve two pier stud spaces as pedestrian, vent passages at a distance from 10~15m.Back production begins the back and advances divider wall polishing one by one in advance with the face of adopting.
3. the cross section of concrete pier stud 2 is selected circular in the lane.The cross-sectional diameter of concrete pier stud 2, center distance in the lane are that concrete strength calculates decision according to the suffered load of concrete pier stud, cement grade; Range of choice: cross-sectional diameter 500~800mm, center distance are at 1.5~5.0m, height 2.8 ± 0.3m.
The concrete pier stud is accomplished vertically to construct at entry in the lane, allowable variation angle ± 2 °, and during inclined shaft construction pier stud, pier stud will have 2~3 ° prop setting angle degree.
4. the concrete pier stud is the concrete pier stud of muscle in the thin steel cylinder outer wall belt in the lane, promptly outer wall be the steel cylinder mould steel cylinder, in establish the concrete pier stud that reinforcing cage is made the pier stud skeleton.
5. the job practices of concrete pier stud and divider wall in the lane:
1) sequence of construction of concrete pier stud and divider wall is in the lane: crossheading tunnel adopt the face open-off cut after, construct concrete pier stud the lane from open-off cut segmentation from inside to outside.About more than 30 pier studs of each construction, about 50m after finishing, use the suitable continuous pulling winch tractive of fortune to move equipment once, and order is carried out from inside to outside.After concrete pier stud pour concrete solidifies in the lane of a segmentation, construct the divider wall of this segmentation subsequently, construction hysteresis pier stud construction 2~5 piers of divider wall; After divider wall has been constructed, carry out the construction of concrete pier stud and divider wall in next segmentation lane.Reserve pedestrian, vent passages when constructing divider wall.
2) concrete pier stud construction method in the lane: at tunnel desired location mounting reinforcing steel bars cage, install pour concrete in pier stud mould, pumping concrete to the pier stud mould, construct concrete pier stud in the lane.Adopt the concentrated casting and constructing mode of getting the raw materials ready of concentrating.
3) pier stud mould: adopt binodal drawing and pulling type steel cylinder fixed mould, be called for short the steel cylinder mould.The steel cylinder mould is flush-mounted in the lower end mould by the upper end mould and constitutes.Upper and lower end mould outer wall is the thin-walled steel cylinder, becomes pier stud steel cylinder outer wall after the pier stud cast.Reinforcing bar is processed the upper and lower end reinforcing cage, and it is the pier stud skeleton that the two grafting one constitutes length-adjustable reinforcing cage, is placed in the pier stud mould.
Overall structure at Fig. 3, the die assembly of pier stud shown in 4.The pier stud die assembly mainly is made up of steel cylinder mould, reinforcing cage, clip 11.The steel cylinder mould is a binodal drawing and pulling type steel cylinder fixed mould, is made up of upper end mould 7, lower end mould 9.Reinforcing cage is formed by upper end reinforcing cage 8,10 connections of lower end reinforcing cage.Link 13 on having on upper end mould 7 outer walls.Following link 12 is arranged on lower end mould 8 outer walls.Be provided with the clip 11 that supplies fixing pneumatic vibrating head to use in steel cylinder mould barrel periphery.
Fig. 5,6 illustrates the structure of clip semicircle hoop.Bolt 15, nut that clip 11 is installed by two semicircle hoops and two ends fixing hole thereof are formed.A little arc-shaped bend is arranged in the middle of the semicircle hoop, supply to insert pneumatic vibrating head and use.
Fig. 7,8 illustrates the structure of steel cylinder mould upper end mould.Figure 13,14 illustrates the structure of steel cylinder mould lower end mould.Upper end mould 7 is made up of the centring ring 17 of upper end cylinder 16 and interior connection thereof.Lower end mould 9 is made up of the centring ring 17 of lower end cylinder 21 and interior connection thereof.
Upper and lower end cylinder 16,21 is for being the thin-walled steel cylinder, with the cylinder of steel sheet weldering system.Centring ring 17 is a steel ring, is welded in cylinder inner wall through bar dowel radially, for using the reinforcing cage location that is placed in the steel cylinder mould.Lower end cylinder 21 is basic identical with upper end cylinder 16 structures, and only centring ring 17 few one decks are one deck.The external diameter of upper end cylinder 16 is slightly less than lower end cylinder 21, and its lower end is embedded in lower end cylinder 21 upper ends, and pull slides up and down.Upper and lower end cylinder 16,21 is the steel cylinder outer wall of pier stud in concrete pier stud cast back.Upper and lower link 13,12 is welded in respectively on the outer wall of upper and lower end cylinder 16,21.
Fig. 9,10 illustrates the structure of upper end reinforcing cage.Figure 11,12 illustrates the structure of lower end reinforcing cage.Upper end reinforcing cage 8, lower end reinforcing cage 10 constitute by the longitudinal reinforcement that is uniformly distributed with welding on steel ring 19 and the excircle thereof 18.It is reinforced bar jointing sleeve pipe 20 that the longitudinal reinforcement upper end of lower end reinforcing cage 10 is welded with steel pipe; Insert in the reinforced bar jointing sleeve pipe 20 of lower end reinforcing cage 10 the longitudinal reinforcement lower end of upper end reinforcing cage 8; Connect one, constitute the adjustable reinforcing cage of longitudinal length, after cast, become the pier stud skeleton.
Upper and lower link 13,12 is made up of the reinforced frame of reinforcing bar weldering by two longitudinally; And two reinforced frames of last link 13 are corresponding identical with the orientation of two reinforced frames on upper and lower end cylinder cross section of following link 12.Two pairs of reinforced frame positions of upper and lower link 13,12 are provided with two kinds: a kind of is reinforced frame deflection upper and lower end cylinder one side of upper and lower link; Two reinforced frames of each link are in radially angle<45 of present position, cylinder cross section °; The radial height of reinforced frame cooperates with angle radially, makes the plane and the upper and lower end cylinder outer round surface that are become between the outside, per two reinforced frame framves top tangent.The reinforced frame of this moment be fit to connect the gauze wire cloth usefulness of divider wall, and the gauze wire cloth and the pier stud outer round surface that are connected between two reinforced frames are tangent.Another kind is the forward and backward both sides that per two reinforced frames of upper and lower link are separately positioned on the upper and lower end cylinder, is symmetrically distributed; Connecting reinforcement was used when the reinforced frame of this moment was adapted at the pour concrete divider wall.Forward and backward both sides refer to the front and back of tunneling direction.One section 4 o'clock steel pipe of place's weldering suitable for reading of cylinder 16 barrels is made grouting port 14 in the upper end, on lower end cylinder 21 barrels, is provided with peep hole 22.
4) the concrete casting and constructing equipment of pier stud: form by concrete pump, mixer, last material conveyer and transfer pipeline four parts.Wherein former three and supporting electric fixtures all are arranged on the car of square position, move construction.Draw and move by being installed in the continuous pulling winch traction of staying the lane.Stay in the lane and lay a railway track, fortune is along interior installation conveyor.
The stowage unit concrete pump selects for use the HBMD-20/18-90S colliery to use concrete pump, and pipeline diameter is DN125mm, mixer: with above-mentioned colliery with the supporting mixer of concrete pump.Last material conveyer: select the 7.5kw electric drum to drive conveyer, bandwidth 600mm; Pneumatic vibrating head: the pneumatic immersion vibrator of ZNF50 type.
5) proportioning of mould material: the C40 concrete is used in the pier stud cast, and its volume proportion is: cement: sand: stone: water=1: 1.08: 2.41: 0.43.
6) the concrete construction sequence of concrete pier stud in the lane:
1. cleaning:, go out the real end, needling to tunnel of 100~200mm degree of depth clearly according to diameter at the bottom of the post in the position of confirming to construct pier stud; Floating cash on the while roof cleaning.
2. the pier stud mould is installed: with the reinforcing cage steel cylinder mould of packing into, place needling to the steel cylinder mould, the height of adjustment reinforcing cage and steel cylinder mould; Utilize the last link of upper end mould, be fixed to the top, tunnel to the upper end mould on the net, make the gap ≯ 100mm of upper end mould and top board, upper and lower side mould overlap joint section ≮ 200mm with seizing wire or iron wire.The grouting port of cast pipeline and pier stud mould is connected firmly.Install friction prop or individual prop temporarily and fix in that the pier stud mould is other, mould is impacted cause dislocation in case build concrete with seizing wire or iron wire.
3. concrete stirs: start mixer earlier, the back is opened and is gone up material conveyer, and Artificial Control adds water, is added to mixer to water, sand, stone and cement by proportioning and stirs.The concrete that stirs is sent into the concrete pump hopper, even continuous feeding.
4. concrete filling: the pumping filling adopts the colliery to use concrete pump.Open concrete pump and carry out the concrete filling, open simultaneously and be inserted in the pneumatic vibrating head between steel cylinder mould and the clip, make in the mould cast of concrete material evenly, to connect the top tight.Local tunnel superelevation protects to wrap up in connecing top, firm with autocratic clip card with waste tape.
5. cleaning equipment: a pier stud filling is accomplished, and in time uses clear water pipe blow-through and concrete pump.
6. the construction method of divider wall: be in the lane, to hang gauze wire cloth and asbestos shingle between the concrete pier stud, and the thick concrete of the 50~200mm that whitewashes forms divider wall, prevent working face extraction after old dead zone leak out.The outer wall both sides of upper and lower end mould are welded with to be specifically designed to and connect the upper and lower link that the fixing gauze wire cloth of divider wall is used.
1) upper and lower end mould outer wall both sides are welded with the upper and lower link of gauze wire cloth respectively, aim at the gauze wire cloth that connects fixing divider wall and design.During construction, the direction of adjustment upper and lower end mould makes upper and lower link aligned in position, and towards the suitable side of fortune.
2) divider wall tentatively is connected shaping with the rhombus net with asbestos shingle earlier.Gauze wire cloth adopts the rhombus net, utilizes pier stud to touch the upper and lower link of gauze wire cloth on the tool, and to base plate, the vertical earlier rhombus net of laying is laterally laid asbestos shingle again by back; The matsurface of asbestos shingle is towards staying lane one side, and the rhombus net is also closely connected in the matsurface side of asbestos shingle, and overlap joint is no less than 100mm between rhombus net and the asbestos shingle, and rhombus net 200mm at interval uses the networking iron wire to connect.Rhombus net, asbestos shingle are vertically hung along the tangent plane of a side along pier stud fortune and are unified into planar walls one.
Whenever reserve two pier stud spaces as pedestrian, vent passages at a distance from 10~15m.With the propelling of stope, one by one the pier stud spaces of reserving is filled with divider wall more later on.
3) the closely knit processing of body of wall: behind the divider wall preliminarily forming, utilize pulp shooting machine to the divider wall closely knit processing of whitewashing.Be to improve gunite effect, asbestos shingle should be with the back side in the face of the whitewashing direction, and the body of wall shotcrete thickness is 50~200mm, must be closely knit, quality is even, has good leakage-preventing performance.
4) gunnite method: adopt damp spice during artificial spice, cement, sand and aggregate chips be the end and turn three times it is mixed clearly.The air feed pressure of pulp shooting machine is at 0.4MPa during injection, and hydraulic pressure is answered the high 0.1MPa of specific wind pressure, and suitable water/binder ratio is 0.4~0.5.The drift angle that will guarantee to adopt empty group after the whitewashing blocks up tight preventing with the base angle spray and leaks out.
5) the whitewashing material of divider wall: use the C20 concrete, its proportioning (volume ratio): cement: sand: stone: water: accelerating admixture=1: 2: 2: 0.45: (0.03~0.05).325# portland cement, stone granularity 5~10mm.
7. anchor rete cord supporting: can support for gob side entry retaining provides powerful, the gob side entry retaining top board is kept perfectly, the compound action of anchor rete cord can make the top board of easy absciss layer form the stack beam and form an integral body; Make simultaneously and adopt sky side top board and more be prone to cut the top, greatly alleviate goaf top plate and be attached to roadside support and stay the pressure on the top board of lane.Fig. 1 stream line adopts Φ 20 * 6000mm, and an array pitch is 1300 * 2700mm; Roll bolt adopts Φ 22 * 2200mm resin anchor, and an array pitch is 800 * 900mm, and two help to adopt Φ 20 * 2200mm resin anchor, and an array pitch is 800 * 900mm.Anchor net: lay 1.2 * 7.0m individual layer longitude and latitude wire lath.Steel band: adopt trapezoidal steel band.
Two. what the face of adopting began after the back production in lane concrete pier stud both sides adds strong supporting temporarily:
As stated, the country rock of gob side entry retaining is at experience III in the stage, when old top come pressure strong, when sedimentation is violent, the ore deposit, tunnel is pressed and is manifested strong, rock deformation is big.So the III stage need add strong supporting, press big stope especially true for the ore deposit.If the pier stud supporting is enough strong, also can add strong supporting temporarily.
After the face back production of adopting begins, big stope is pressed in the ore deposit, the both sides of concrete pier stud can add strong supporting temporarily in the lane, and with the propelling follow-up supporting of adopting face.Crossheading one side of concrete pier stud in the lane, add strong supporting temporarily and also be adopt face direction of propulsion bearing pressure area of stress concentration add strong supporting in advance, scope is by adopting outlet beginning under the face.Gob side entry retaining one side of concrete pier stud in the lane adds strong supporting temporarily and also will lag behind and add strong supporting except adding strong supporting in advance, and it is identical with crossheading one side that it adds the strong supporting scope in advance; Its hysteresis adds the strong supporting scope and is extended to a segment distance thereafter by the correspondence position of adopting outlet under the face; This segment distance maintenance ≮ 60m promptly exceeds bearing pressure area of stress concentration scope, and with the propelling of adopting face; In time return to remove and move forward to lag behind and add the supporting of strong supporting rear end and observation roof pressure and mining influence; The length that when supporting can not meet the demands, will in time extending lags behind adds strong supporting is or/and density.
The support layout plan that after stope begins back production shown in Figure 15, temporarily adds strong supporting.The diagram stope is a fully mechanized coal face.Arrange the equipment of putting of combining between stope rib 18, the goaf 20: integrated caving hydraulic support 19, flitting, anterior drag conveyor, rear portion drag conveyor.
After the face back production of adopting began, the both sides of concrete pier stud will add strong supporting temporarily in the lane.Haulage gate 3 one sides that temporarily add strong supporting concrete pier stud 2 in the lane adopt mixes supporting, and promptly leading portion adopts a word beam to add individual prop 24 supportings, and back segment is promptly adopted suitable hydraulic support 23 supportings of exit employing automatic moving type fortune under the face; Gob side entry retaining 1 one sides of concrete pier stud 2 in the lane add strong supporting in advance and adopt the automatic moving type rail along hydraulic support 22 supportings; Hysteresis adds strong supporting and adopts a word beam to add individual prop 21 supportings; Add strong supporting segment limit ≮ 50m in advance; Automatic moving type fortune all should have " anchor shaft anchor cable is dodged protection mechanism " along hydraulic support 23, automatic moving type rail along hydraulic support 22, promptly has the movable panel of band groove and the top of passing movable panel to transfer jack on the back timber.
Automatic moving type fortune can adopt patented technology " fully mechanized working faces along conveying end head bracket " (company of Yanzhou Mining Group patent of invention, the patent No.: ZL 200610045258.9, publication number: CN 101096911A) along hydraulic support 23.Two one group of patterns before and after this support is made up of forward and backward support; Forward and backward support is left and right sides unsymmetric structure, promptly leans on work plane one side big for short base, single column, clearance space; Its back timber is provided with " anchor shaft anchor cable is dodged protection mechanism ".This support aims at fully mechanized coal face fortune and designs along end support.
The automatic moving type rail can adopt patented technology " fully mechanized caving face along-track end bracket " (patent of invention of company of Yanzhou Mining Group, the patent No.: ZL 200710015658.X) along hydraulic support 22.This support is made up of anchor support, advance timbering, face end support, machine tail end tail support.With it do concrete pier stud in the lane gob side entry retaining one side add strong supporting temporarily: add strong supporting in advance and hysteresis adds strong supporting,, but will increase " anchor shaft anchor cable is dodged protection mechanism " at back timber without its machine tail end tail support.When the face of adopting of next section began back production, gob side entry retaining promptly became the track crossheading that this section is adopted face, and make the track crossheading with it and add strong supporting temporarily in advance this moment, and then four parts of " fully mechanized caving face along-track end bracket " all will be used.But still need add " anchor shaft anchor cable is dodged protection mechanism " at back timber.This support aims at the fully mechanized caving face along-track end supporting and designs.Similarly support also has the patent " fully mechanized caving face along-track end bracket " (patent No.: ZL 200610070396.2) of company of Yanzhou Mining Group.
In order to protect the anchor pole or the anchor cable that stay the lane inside ceiling panel not to be damaged, to continue to use, in staying the lane, on the back timber of each hydraulic support " anchor shaft anchor cable is dodged protection mechanism " all should be set.This mechanism transfers jack to constitute by movable panel, two ends and back timber on the back timber end face of hydraulic support and the hinged top of movable panel.Movable panel is that the ribbon groove is arranged on the end face.See foregoing invention patent " fully mechanized working faces along conveying end head bracket " for details.
In order to overcome mining influence twice: the influence of ahead work face bearing pressure is big, the ore deposit pressure manifests acutely, the drift section shrinkage factor is big and be out of shape big problem; Advance the place ahead at stope, pier stud stays in the tunnel of lane one side with the suitable hydraulic support advance support of automatic moving type rail in the lane; Add the supporting resistance of forcing to stay in the lane; Reduce the pressure that pier stud bore in the lane, reduce the shrinkage factor and the distortion of drift section.
At stope is that big gun is adopted or during conventional face, adds strong supporting and hysteresis temporarily in advance and adds strong supporting and can all adopt a word beam to add the hydraulic prop supporting.
Three. next section stope begins the strong supporting that adds of gob side entry retaining after the back production:
After the face of adopting of next section began back production, gob side entry retaining promptly became the track crossheading that next section is adopted face, with the propelling of adopting face, add strong supporting in advance, and the supporting scope will exceed the bearing pressure area of stress concentration.
The mining influence stage second time: the influence of remaining bearing pressure that the upper curtate back production causes and the stack of this section ahead work face bearing pressure; Its surrouding rock deformation velocity ratio III stage; Promptly the mining influence stage is big for the first time; But promptly scrap after back production in the tunnel, need not safeguard the tunnel at the stope rear.
Through adding strong supporting in advance, the supporting resistance in the increase gob side entry retaining reduces the suffered load and the distortion of staying the lane country rock of concrete pier stud in the lane, is reduced in the influence that bearing pressure causes to concrete pier stud in the lane when adopting the face propelling, keeps staying the stability in lane.
The method of gob side entry retaining of the present invention is particularly suited for base plate or/and the softer coal-face of top board adopts.
Other work-around solution of the present invention:
1. the cross section of concrete pier stud also can be square, rectangle, ellipse, polygon etc. in the lane.For example: when concrete pier stud cross section is rectangle in the lane, the length of side: horizontal 600mm ± 100mm, vertical 800mm ± 200mm; The concrete pier stud is along channel spacing distance: center to center distance 3m~5m in the lane.But, be preferred with the circular cross section.
2. the pier stud mould adopts detachable steel cylinder filling mould.The concrete pier stud is the concrete pier stud of muscle in the normal tape of no steel sheet outer wall in the lane.Like this, pier stud need increase the supporting intensity that pier stud is improved in the cross section.
3. the concrete pier stud is followed the construction of driving, ecto-entad in the lane: digging laneway carries out the supporting of anchor rete cord earlier, then in the tunnel laterally in the middle of the mounting reinforcing steel bars cage, install the pier stud mould, with pour concrete in pumping concrete to the pier stud mould, construct concrete pier stud in the lane.All the other are identical with embodiment.
4. construct divider wall with casting: after the face of adopting begins back production; Propelling with stope; Adopt the face certain distance in advance; Pour concrete between the concrete pier stud in the lane is constructed " concrete divider wall " between the pier stud, and the concrete pier stud constitutes the roadside support body of prop in the lane that is gob side entry retaining jointly in concrete divider wall and the lane.Crossover distance will exceed the scope of adopting face direction of propulsion bearing pressure area of stress concentration.The diameter of concrete pier stud in the width≤lane of concrete divider wall.In the pour concrete divider wall, in the lane in the tunnel of the concrete pier stud left and right sides, between what cast pier stud, after the concrete divider wall pouring practice point, add strong supporting temporarily, and with the propelling of the pouring practice point supporting of following up.

Claims (10)

1. the method for a gob side entry retaining; Crossheading phase of boring at stope; Promptly gob side entry retaining is made overall arrangements: with the crossheading of stope and gob side entry retaining be the adjacent crossheading that next section is adopted face " unite two into one ", as a tunnelling; Construct " concrete pier stud in the lane " supporting between the two, not only as supporting in the crossheading lane but also as the part of gob side entry retaining roadside support body; That is: widen the digging laneway section, and reserve the drift section area according to the shrinkage factor that gob side entry retaining stands twice bearing pressure effect, the casting reinforced concrete pier stud in horizontal middle part i.e. " concrete pier stud in the lane " cooperates the anchor rete cord supporting in tunnel in the tunnel; To stopping adopting line along the alternate layout of digging laneway total length, digging laneway " is divided into two ": a side is a crossheading to the concrete pier stud from the stope open-off cut in the lane, and opposite side is a gob side entry retaining; After the concrete pier stud is constructed in the lane, in the lane, construct between the concrete pier stud " divider wall "; The concrete pier stud is connected the common roadside support body that constitutes gob side entry retaining in divider wall and the lane.
2. the method for gob side entry retaining according to claim 1 is characterized in that: in the said lane cross section of concrete pier stud be following shape one of them: circular, square, rectangle, ellipse, polygon.
3. the method for gob side entry retaining according to claim 2 is characterized in that: said cross section is concrete pier stud in the circular lane, is the concrete pier stud of muscle in the thin-walled steel cylinder band, promptly outer wall be the thin-walled steel cylinder, in establish the concrete pier stud of cage of reinforcement; Diameter 500~800mm, the center distance of bearing of trend: 1.5m~5m along the tunnel.
4. the method for gob side entry retaining according to claim 3; It is characterized in that: the construction method of the concrete pier stud of muscle is in the said thin-walled steel cylinder band: the pier stud mould is installed in the intermediate settings position in the tunnel; Reinforcing cage places the pier stud mould in advance; With pouring into a mould in pumping concrete to the pier stud mould, construct concrete pier stud in the lane; The pier stud mould adopts binodal drawing and pulling type steel cylinder fixed mould; This mould is that the upper and lower end mould of thin-walled steel cylinder is formed by outer wall, and the upper end mould is embedded in the mould of lower end up and down that pull slides, and is the steel cylinder outer wall of pier stud after the cast; The adjustable reinforcing cage of longitudinal length that is made up of upper and lower end reinforcing cage grafting one is the pier stud skeleton; The concrete casting equipment of concrete pier stud: concrete pump, mixer, last material conveyer and supporting electric fixtures, be installed on the car of square position, move construction; Draw by the continuous pulling winch traction that is installed in digging laneway gob side entry retaining side and to move.
5. the method for gob side entry retaining according to claim 1 is characterized in that: concrete pier stud, divider wall in the said lane, the two construct sequential be in tunnelling behind open-off cut, construct concrete pier stud the lane from open-off cut segmentation from inside to outside; After concrete pier stud pour concrete solidifies in the lane of a segmentation, construct the divider wall of same segmentation; Partition wall construction hysteresis pier stud construction 2~5 piers; After the divider wall of last segmentation has been constructed, carry out constructing of next segmentation; Whenever be spaced a distance separated pedestrian, the vent passages done of slot milling between the concrete pier stud in the lane; Back production begins the propelling of back with stope, in advance spaces is filled divider wall one by one.
6. according to the method for claim 1 or 5 described gob side entry retainings; It is characterized in that: said divider wall, its construction method are in the lane, between the concrete pier stud, to utilize being exclusively used in of pier stud mould outer wall one side to connect the fixedly upper and lower link of gauze wire cloth; Hang gauze wire cloth and asbestos shingle; Gauze wire cloth, asbestos shingle are vertically hung along the tangent plane of a side along pier stud fortune and are unified into planar walls one, and in gob side entry retaining one side with the thick concrete of pulp shooting machine whitewashing 50~200mm, build up divider wall.
7. the method for gob side entry retaining according to claim 1 is characterized in that: said divider wall, construct " concrete divider wall " with casting; Construct sequential and be after this section is adopted face and begun back production, advance, in the lane, constructed between the concrete pier stud in leading 15~28 days " concrete divider wall " with stope; Construction method is in the lane, to connect filling mould between reinforcing bar, installation pier stud, filling mould between pumping concrete to pier stud, pour concrete divider wall between the concrete pier stud; Simultaneously, add strong supporting behind the what setting temporarily, and advance the follow-up supporting with setting.
8. the method for gob side entry retaining according to claim 1; It is characterized in that: said stope is that the stope big, that roadway deformation is big is pressed in the ore deposit; After adopting the face back production, concrete pier stud both sides add strong supporting temporarily and advance the follow-up supporting with the face of adopting in the lane; Concrete pier stud crossheading one side in the lane adds strong supporting temporarily and is and adds strong supporting in advance at the leading bearing pressure area of stress concentration of the face of adopting; Concrete pier stud gob side entry retaining one side in the lane; Add temporarily that strong supporting comprises in advance, lagging behind adds strong supporting; It is identical with crossheading one side to add the strong supporting scope in advance, and hysteresis adds the strong supporting scope, and the outlet correspondence position is extended to a segment distance thereafter under the face by adopting, and promptly adopts face rear support pressure stresses concentration zones; The face propelling is removed for timely time and the hysteresis that moves forward adds the supporting of strong supporting rear end with adopting, and observes roof pressure and mining influence; Lengthening hysteresis in time adds strong supporting length or/and density when supporting can not meet the demands; After next section is adopted face and is begun back production, in gob side entry retaining, be the track crossheading that next section is adopted face, advance with the face of adopting to add strong supporting in advance, the supporting scope is leading bearing pressure area of stress concentration.
9. the method for gob side entry retaining according to claim 8; It is characterized in that: saidly add strong supporting temporarily; Crossheading one side of concrete pier stud adopts and mixes supporting in the lane: leading portion adopts a word beam to add the individual prop supporting, and back segment is promptly adopted the suitable hydraulic support stand of exit employing automatic moving type fortune under the face; Gob side entry retaining one side of concrete pier stud in the lane, leading, hysteresis add strong supporting and all adopt the suitable hydraulic support of automatic moving type rail or/and a word beam adds the individual prop supporting; Automatic moving type fortune all has " anchor shaft anchor cable is dodged protection mechanism " along hydraulic support, automatic moving type rail along hydraulic support, promptly has the movable panel of band groove and the top of passing movable panel to transfer jack on the back timber.
10. the special-purpose pier stud die assembly of the method for gob side entry retaining according to claim 1 is characterized in that: comprise steel cylinder mould, reinforcing cage and clip; The steel cylinder mould is a binodal drawing and pulling type steel cylinder fixed mould, is made up of upper and lower end mould (7,9); Upper end mould (7) comprises upper end cylinder (16) and centring ring (17) thereof; Lower end mould (9) comprises lower end cylinder (21) and centring ring (17) thereof; Upper and lower end cylinder (16,21) is the thin-walled steel cylinder; Centring ring (17) is the steel ring for the reinforcing cage location; Cylinder (16) lower end, upper end is embedded in lower end cylinder (21) and can slides up and down; Upper and lower end cylinder (16,21) is a pier stud steel cylinder outer wall; Reinforcing cage is formed by upper and lower end reinforcing cage (8,10) connection, and the two (8,10) constitute by the longitudinal reinforcement (18) of steel ring (19) and excircle welding thereof; There is reinforced bar jointing sleeve pipe (20) lower end reinforcing cage (10) longitudinal reinforcement upper end, and insert in the reinforced bar jointing sleeve pipe (20) of lower end reinforcing cage (10) upper end reinforcing cage (8) longitudinal reinforcement lower end, and constituting the adjustable reinforcing cage of longitudinal length is the pier stud skeleton; On upper end cylinder (16) barrel, last link (13) is arranged, there is grouting port (14) at barrel place suitable for reading; On lower end cylinder (21) barrel, following link (12) is arranged; The upper and lower link (13,12) that couplet gauze wire cloth or reinforcing bar are used is formed by two longitudinal reinforcement framves; Correspondence is identical in the orientation in cylinder cross section for upper and lower two pairs of reinforced frames; The reinforced frame position has two kinds: a kind of is reinforced frame deflection upper and lower side cylinder one side; Per two reinforced frames are in radially angle<45 in cylinder cross section °; The reinforced frame radial height cooperates with angle radially, makes between per two reinforced frame outer surfaces formed plane and pier stud outer round surface tangent; Another kind is the both sides, front and back that upper and lower per two reinforced frames are separately positioned on the upper and lower side cylinder, is symmetrically distributed; The both sides, front and back refer to the front and back of tunneling direction.Outside the steel cylinder mould, be with the clip (11) of fixing pneumatic vibrating head.
CN 201110267050 2011-09-09 2011-09-09 Method for retaining gob-side tunnel CN102337904B (en)

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CN102733832A (en) * 2012-07-05 2012-10-17 大同煤矿集团有限责任公司 Support method for extra-thick broken coal seam employing nest anchored ropes
CN102926768A (en) * 2012-11-15 2013-02-13 华北科技学院 Roadway support truss and mounting method thereof
CN103061771A (en) * 2012-12-20 2013-04-24 大同煤矿集团有限责任公司 Remining mine fully-mechanized coal mining face open-off cut tunneling process and supporting method
CN103334778A (en) * 2012-12-21 2013-10-02 中交一公局第三工程有限公司 Construction technology of step temporary support and partial double side walls
CN103603681A (en) * 2013-11-06 2014-02-26 神华集团有限责任公司 Support separation wall and construction method thereof
CN104405404A (en) * 2014-11-14 2015-03-11 山东科技大学 Mine gas tail roadway reservation method
CN105715297A (en) * 2016-01-26 2016-06-29 山东科技大学 Method for treating heavy inclined seam gob-side entry retaining gangue
WO2016206617A1 (en) * 2015-06-24 2016-12-29 何满潮 Anti-collapse structure beside roadway based on 110 construction method for breaking roof
CN106677804A (en) * 2017-02-23 2017-05-17 山东建筑大学 Gob-side entry retaining roadside support system and construction method thereof
CN106988782A (en) * 2017-05-23 2017-07-28 中国神华能源股份有限公司 Underground coal mine fire seal construction method
CN107083959A (en) * 2017-06-02 2017-08-22 天地科技股份有限公司 A kind of gob-side entry retaining method
CN107701212A (en) * 2017-12-01 2018-02-16 河南理工大学 A kind of surrounding rock of actual mining roadway subregion anchoring and strength control topmast maintaining method
CN108071405A (en) * 2017-09-12 2018-05-25 中国矿业大学(北京) A kind of brutal method for protecting support such as colliery rectangular shaped roadways top plate
CN108222934A (en) * 2015-06-24 2018-06-29 北京中矿创新联盟能源环境科学研究院 Reserve the change system of lane exploitation engineering method for one's own use without coal column in no tunnel
CN108487920A (en) * 2018-03-19 2018-09-04 山东里能鲁西矿业有限公司 A kind of gob side entry retaining pier stud concrete grouting current divider
CN110118085A (en) * 2019-04-18 2019-08-13 中国矿业大学 A kind of compound advanced secondary tunneling method in two lane of top working face of large mining depth high working face
US10494924B2 (en) 2015-06-24 2019-12-03 Manchao He Longwall mine construction method N00
CN111236968A (en) * 2020-03-27 2020-06-05 天地科技股份有限公司 Rock burst roadway advanced support anti-impact method

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CN102733832A (en) * 2012-07-05 2012-10-17 大同煤矿集团有限责任公司 Support method for extra-thick broken coal seam employing nest anchored ropes
CN102926768A (en) * 2012-11-15 2013-02-13 华北科技学院 Roadway support truss and mounting method thereof
CN103061771B (en) * 2012-12-20 2015-10-21 大同煤矿集团有限责任公司 Second mining mine fully mechanized coal face cuts eye driving and supporting method thereof
CN103061771A (en) * 2012-12-20 2013-04-24 大同煤矿集团有限责任公司 Remining mine fully-mechanized coal mining face open-off cut tunneling process and supporting method
CN103334778A (en) * 2012-12-21 2013-10-02 中交一公局第三工程有限公司 Construction technology of step temporary support and partial double side walls
CN103603681A (en) * 2013-11-06 2014-02-26 神华集团有限责任公司 Support separation wall and construction method thereof
CN103603681B (en) * 2013-11-06 2016-08-17 神华集团有限责任公司 A kind of support divider wall and construction method thereof
CN104405404A (en) * 2014-11-14 2015-03-11 山东科技大学 Mine gas tail roadway reservation method
CN108222934A (en) * 2015-06-24 2018-06-29 北京中矿创新联盟能源环境科学研究院 Reserve the change system of lane exploitation engineering method for one's own use without coal column in no tunnel
US10677055B2 (en) 2015-06-24 2020-06-09 Manchao He Fractured roof 110 mining method entry-side anti-collapsed structure
WO2016206617A1 (en) * 2015-06-24 2016-12-29 何满潮 Anti-collapse structure beside roadway based on 110 construction method for breaking roof
US10494924B2 (en) 2015-06-24 2019-12-03 Manchao He Longwall mine construction method N00
US11008860B2 (en) 2015-06-24 2021-05-18 Manchao He Equipment system for no-roadway no-coal-pillar retained roadway mining method
CN105715297B (en) * 2016-01-26 2018-01-30 山东科技大学 Half-edge coal seam gob side entry retaining spoil administering method
CN105715297A (en) * 2016-01-26 2016-06-29 山东科技大学 Method for treating heavy inclined seam gob-side entry retaining gangue
CN106677804A (en) * 2017-02-23 2017-05-17 山东建筑大学 Gob-side entry retaining roadside support system and construction method thereof
CN106988782A (en) * 2017-05-23 2017-07-28 中国神华能源股份有限公司 Underground coal mine fire seal construction method
CN107083959A (en) * 2017-06-02 2017-08-22 天地科技股份有限公司 A kind of gob-side entry retaining method
CN108071405A (en) * 2017-09-12 2018-05-25 中国矿业大学(北京) A kind of brutal method for protecting support such as colliery rectangular shaped roadways top plate
CN107701212A (en) * 2017-12-01 2018-02-16 河南理工大学 A kind of surrounding rock of actual mining roadway subregion anchoring and strength control topmast maintaining method
CN108487920A (en) * 2018-03-19 2018-09-04 山东里能鲁西矿业有限公司 A kind of gob side entry retaining pier stud concrete grouting current divider
CN110118085A (en) * 2019-04-18 2019-08-13 中国矿业大学 A kind of compound advanced secondary tunneling method in two lane of top working face of large mining depth high working face
CN111236968A (en) * 2020-03-27 2020-06-05 天地科技股份有限公司 Rock burst roadway advanced support anti-impact method

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