CN106401609A - Bottom plate pressure relief and reinforcement structure for controlling floor heave of deep roadway and construction method of bottom plate pressure relief and reinforcement structure - Google Patents

Bottom plate pressure relief and reinforcement structure for controlling floor heave of deep roadway and construction method of bottom plate pressure relief and reinforcement structure Download PDF

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Publication number
CN106401609A
CN106401609A CN201610990065.4A CN201610990065A CN106401609A CN 106401609 A CN106401609 A CN 106401609A CN 201610990065 A CN201610990065 A CN 201610990065A CN 106401609 A CN106401609 A CN 106401609A
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China
Prior art keywords
pressure relief
tunnel
relief groove
roadway
anchor pole
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CN201610990065.4A
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Chinese (zh)
Inventor
翟新献
翟俨伟
李明远
涂兴子
李如波
郭春生
黄广帅
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Henan University of Technology
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Henan University of Technology
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Priority to CN201610990065.4A priority Critical patent/CN106401609A/en
Publication of CN106401609A publication Critical patent/CN106401609A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E21D11/105Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • E21D20/021Grouting with inorganic components, e.g. cement
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0093Accessories

Abstract

The invention discloses a bottom plate pressure relief and reinforcement structure for controlling a floor heave of a deep roadway and a construction method of the bottom plate pressure relief and reinforcement structure. The construction method comprises the following steps: (1) excavation of a roadway and anchor mesh supporting: excavating the deep roadway, and performing the anchor mesh supporting on a surrounding rock after the surrounding rock is formed; and (2) digging of two pressure relief troughs: respectively digging a long-strip-type pressure relief trough in each of the left and right sides of a bottom plate of the roadway through an air pick along the axial direction of the roadway, wherein the cross section of each pressure relief trough is rectangular, and the pressure relief troughs take a boundary line of one side end as a symmetric line. In conclusion, a bottom plate pressure relief method is used for controlling the problems of the floor heave of the deep roadway and deformation of the surrounding rock; and on the basis of a deep roadway anchor and injection supporting technology at the present, the pressure relief effect on the surrounding rocks on the bottom plate, two ends and a top plate is improved by reasonably determining the shape, the size and the arrangement position of each pressure relief trough, the number of secondary interstices in the surrounding rocks is increased, the grouting effect on the surrounding rocks is enhanced, the problem of the floor heave of the deep roadway can be effectively controlled, and long-term stability of the surrounding rock of the deep roadway is guaranteed.

Description

A kind of base plate release ruggedized construction controlling deep tunnel bottom distension and its construction method
Technical field
The invention belongs to roadway support field is and in particular to a kind of base plate release ruggedized construction of control deep tunnel bottom distension And its construction method.
Background technology
Impact due to tunnelling or coal seam back production destroys initial rock stress field, causes roadway surrounding rock stress again to divide Cloth, when country rock concentrated stress exceedes Surrounding Rock Strength, there is plastic deformation in country rock, be mainly shown as that tunnel roof and floor and two is helped to enclose Rock moves to lane space, and wherein roadway floor country rock becomes bottom distension to the movement in tunnel.Generally at roadway floor In non-support or no closed state, roadway floor is low compared with the supporting intensity of roadway's sides and top board, occurs in that roadway deformation is broken Bad first from base plate distension i.e. bottom distension start, roadway's sides convergence, leads to roadway support complete failure, therefore deep mining lane afterwards Road(Chamber)Bottom distension problem always affects tunnel(Chamber)Adjoining rock stability, increases the principal element of roadway support difficulty, wherein Deep tunnel bottom distension amount accounts for tunnel roof to floor convergence more than 80%, and floor lift in gallery not only increases roof to floor convergence, reduces Drift section size, has influence on normal transport, ventilation and the pedestrian in tunnel.When bottom distension amount reaches 0.8 ~ more than 1m, tunnel needs Act as a planted agent maintenance, maintenance cost is high.For the chamber such as the head being provided with big scale fixed equipments or hoist house, if chamber is sent out The certain bottom distension of life, it will cause main equipment footing foundation to tilt, directly influence the normal operation of equipment, or even occur stopping The hidden danger that the situation of product maintenance is the normal pedestrian of coal mine roadway, transport safely, is that mine safety production brings serious threat. With the increase of coal mining depth, mine enters deep mining, and geological condition of coal mine deteriorates, the lane of shallow mining medium-hard rock Road country rock gradates as Deep Soft Rock.Roadway surrounding rock deformation amount particularly bottom distension amount significantly increases, and bottom distension problem is more prominent. A large amount of LIMIT OF GROUND BEHAVIOR IN COAL MINE pressure site observation result show, under conditions of mining depth 600 ~ 800m, the tunnel producing bottom distension accounts for 25% about;Under conditions of mining depth 900m, bottom distension tunnel accounts for 40%;When mining depth is more than 1000m, bottom distension tunnel exceedes 80%, and the increase with mining depth, bottom distension amount and its shared ratio in roof to floor convergence will be gradually increased.Bottom distension is tight The tunnel of weight causes the roadway's sides amount of shifting near to increase, and deformation of the surrounding rock in tunnel is in rheology, and country rock plays pendulum, ore deposit Well needs to expend substantial amounts of human and material resources and financial resources are repeatedly overhauled, or even causes scrapping completely of whole piece tunnel.Therefore, How to efficiently control deep tunnel bottom distension, keep the steady in a long-term of roadway floor country rock, for guarantee deep mining colliery lane The normal of road has important practical significance using with mine safety production.
Content of the invention
The present invention in order to solve weak point of the prior art, provides that a kind of structure is simple, easy construction, design are closed Manage, efficiently control the method controlling deep tunnel bottom distension of floor lift in gallery phenomenon.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that:A kind of base plate controlling deep tunnel bottom distension Release ruggedized construction, including being arranged in the twice pressure relief groove of roadway floor both sides and be injected in the jetting cement on roadway surrounding rock surface, The within the rock in tunnel-surrounding deep is provided with some anchor pole layers, and all of anchor pole layer is uniformly arranged side by side along the axial direction in tunnel, Often row's anchor pole layer includes some anchor poles being evenly arranged along tunnel-surrounding ring, and the anchor tail end of anchor pole is fixed with by nut With the pallet of jetting cement press fit, anchor pole is vertically arranged with jetting cement surface, passes through steel between the adjacent anchor tail end of anchor pole Cord connects;Twice pressure relief groove is symmetricly set on the left and right sides of roadway floor.
A kind of construction method of the base plate release ruggedized construction controlling deep tunnel bottom distension, comprises the following steps:
(1)Digging laneway simultaneously carries out bolting with wire mesh:Deep tunnel excavates, and after country rock molding, implements bolting with wire mesh to country rock;
(2)Dig out twice pressure relief groove:In the roadway floor left and right sides along the axis direction in tunnel, dig out one respectively using pneumatic pick The pressure relief groove of strip, the cross section of pressure relief groove is rectangle, pressure relief groove with the boundary line of tunnel one lateral wall as line of symmetry, release The depth of groove is 2000mm, and the depth of width 800mm, wherein pressure relief groove refers to the length along pressure relief groove short transverse, pressure relief groove Width refer to pressure relief groove length in left-right direction, the length of pressure relief groove is the length in tunnel;
(3)Base plate is carried out with slip casting and concrete filling is carried out to pressure relief groove;Pressure relief groove excavates, and roadway surrounding rock deforms, through 10- After country rock release in 15 days, grouting and reinforcing is carried out to roadway floor, afterwards twice pressure relief groove is carried out with jetting cement filling and enriches;
(4)Carry out grouting and reinforcing to inside roadway's sides and top board.
3rd, a kind of base plate release ruggedized construction controlling deep tunnel bottom distension according to claim 2 and its construction party Method it is characterised in that:Step(1)In to country rock implement bolting with wire mesh concretely comprise the following steps:
a)One layer of jetting cement is sprayed on the rough section in tunnel;
b)Then along tunnel ring construction first row anchor pole layer, and by pallet, the anchor tail end of anchor pole is arranged on jetting cement;
c)The axis direction that the construction of first row anchor pole layer finishes tailing edge tunnel is constructed second row anchor pole layer, the 3rd row's anchor pole successively The anchor tail end of all of for each row anchor pole is fixed on jetting cement while construction by layer ... by pallet;
Then pass through and axially with the steel wire rope of ring, the anchor tail end of all of anchor pole link together along tunnel, tunnel axially and The webbed wire rope net of steel wire rope shape of ring.
Using technique scheme, on the basis of current deep tunnel bolting and grouting support, come using base plate destressing method Control deep tunnel bottom distension, by the double square pressure relief groove in deep tunnel backplane rational position and reasonable size, pass through After the release of 10 ~ 15 day time, roadway surrounding rock deforms, and heavily stressed in roadway's sides and roof and floor turns to deep wall rock Move, tunnel superficial part surrouding rock stress reduces, and can be obviously improved roadway surrounding rock stress field;Be conducive to giving full play to holding of deep wall rock Loading capability, reduces the Support Resistance of superficial part confined pressure, thus reducing the supporting difficulty in tunnel.After surrouding rock deformation tends towards stability, To roadway floor, two help and roof rock carries out grouting and reinforcing, with ensure roadway floor, two help steady for a long time with roof rock Fixed.Deep tunnel tunnels, expose after country rock carries out bolting with wire mesh, and distance is met head on 5m, in roadway floor both sides, by pneumatic pick Hand excavation goes out two rectangle pressure relief grooves of width 800mm, depth 2000mm.Pressure relief groove is located at roadway's sides base plate and tunnel bottom The bottom of plate, with roadway's sides boundary line for pressure relief groove line of symmetry;After in pressure relief groove, fractured rock takes out, in roadway floor Form two " weak structure ", be that floor lift in gallery reserves certain deformation space;After release, tunnel superficial part base plate heavily stressed, To the transfer of deep rock stratum.It is compacted and densification when fractured rock in the pressure relief groove of tunnel base angle occurs, absorb floor rocks deformation Amount, illustrate " weak structure " to roadway floor, two help and the heavily stressed of top board has carried out effective release, improve roadway floor, two Side and the surrouding rock stress distribution situation of top board.After generally pressure relief groove excavates 10 ~ 15 days, tunnel superficial part roof and floor and two is helped to enclose Rock stress has carried out abundant release, is mainly shown as that country rock deforms movement.Base plate pressure relief groove forming process and pressing through unloading Cheng Zhong, back, two helps to open further, extend and extend with initial fissure in roof rock rock stratum, occurs new simultaneously Secondary interstice, causes cranny development in country rock, is conducive to the release of roadway's sides and roof strata, is conducive to the later stage to lane simultaneously Road base plate, two help and roof rock grouting and reinforcing.After base plate pressure relief groove release, first slip casting is carried out to roadway floor country rock Reinforce, afterwards Double-bottom-plate pressure relief groove is carried out with jetting cement filling and enriches, form two " strong structure " in roadway floor country rock.Tunnel " strong-weak-strong " supporting construction of base plate, can support and control the bottom distension in tunnel effectively.Finally, when roadway's sides deformation and Crush after velocity-stabilization, grouting and reinforcing is carried out to roadway's sides and top board, be conducive to after slip casting improving the strong of country rock Degree, increased the supporting performance of bolting with wire mesh simultaneously.The therefore present invention, from raising deep laneway surrounding rock supporting intensity and reduction lane Surrouding rock stress two aspects in road take measures it is ensured that deep laneway surrounding rock and bolt-grouting support system tend to balance, and reach deep lane Road country rock is chronically at stable purpose;
The release effect of roadway floor pressure relief groove, can reduce the scope in area and the big of stress value with base plate superficial part terrane stress Little, and the intensity of base plate superficial part rock stratum to be representing, the depth and width that the former includes pressure relief groove with pressure relief groove size are relevant, after Person is relevant with floor grouting reinforcing.Pneumatic pick is adopted to implement under the technical conditions of base plate release construction at present, the depth of pressure relief groove is straight Connect the complexity having influence on release construction and release effect.Have influence on release effect when pressure relief groove is shallower, then straight when deeper Connect the difficulty increasing construction.Release in recent years-strengthening groove has in Pingdingshan mining area table mountain Tian An coal industry share The horizontal great Xiang of the mines such as limit company one ore deposit, six ore deposits, eight ore deposits and ten ore deposits and on(Under)In the tunnel of mountain, carry out situ industrial examination Test, effect is significant.Therefore, the present invention, on the basis of the field test of Pingdingshan Coal Mine, in conjunction with numerical result, have studied bottom Plate release-strengthening groove controls deep tunnel bottom distension and its construction method it is determined that the position of deep tunnel base plate pressure relief groove, release Groove reasonable size, effectively improves deep laneway surrounding rock stress distribution, improves traditional Effect of Bolt-grouting Support, reduces The supporting of deep tunnel and maintenance cost are it is ensured that the normal production in the steady in a long-term and colliery of deep laneway surrounding rock.
In sum, the present invention to control deep tunnel bottom distension and surrouding rock deformation problem using base plate destressing method, current On the basis of deep tunnel bolting and grouting support, by the reasonable shape determining pressure relief groove, size, and position, improve Base plate, two help and roof rock release effect, increased secondary interstice in country rock, improve wall rock grouting effect, can be effective Ground control deep tunnel bottom distension problem it is ensured that deep laneway surrounding rock steady in a long-term.
Brief description
Fig. 1 is bolt-spary supports tunnel of the present invention profile;
Fig. 2 is tunnel of the present invention horizontal layout schematic diagram;
Fig. 3 is tunnel of the present invention axial section.
Specific embodiment
As Figure 1-3, the base plate release ruggedized construction of a kind of control deep tunnel bottom distension of the present invention, including being arranged in The twice pressure relief groove 3 of roadway floor 2 both sides and the jetting cement 4 being injected in roadway surrounding rock surface, the within the rock in tunnel-surrounding deep It is provided with some anchor pole layers, all of anchor pole layer is uniformly arranged side by side along the axial direction in tunnel, often row's anchor pole layer includes some The anchor pole 1 being evenly arranged along tunnel-surrounding ring, the anchor tail end of anchor pole 1 is bolted and is provided with and jetting cement 4 press fit Pallet 5, anchor pole 1 is vertically arranged with jetting cement 4 surface, is connected by steel wire rope between the adjacent anchor tail end of anchor pole 1;Twice Pressure relief groove 3 is symmetricly set on the left and right sides of roadway floor 2.
A kind of construction method of the base plate release ruggedized construction controlling deep tunnel bottom distension, comprises the following steps:
(1)Digging laneway simultaneously carries out bolting with wire mesh:Deep tunnel excavates, and after country rock molding, implements bolting with wire mesh to country rock;
(2)Dig out twice pressure relief groove;After bolting with wire mesh becomes lane, for controlling roadway floor 2 that bottom distension occurs, in 2 liang of roadway floor Side digs out the pressure relief groove 3 of a strip respectively along the length direction in tunnel using pneumatic pick, and the cross section of pressure relief groove 3 is rectangular Shape, with the boundary line of tunnel one lateral wall as line of symmetry, the depth of pressure relief groove 3 is 2000mm, width 800mm to pressure relief groove 3, wherein unloads The depth of indent 3 refers to the length along pressure relief groove 3 short transverse, and the width of pressure relief groove 3 refers to the lateral length of pressure relief groove 3, unloads The length of indent 3 is the length in tunnel.
(3)Carry out concrete filling to base plate 2 slip casting with to pressure relief groove 3;Through the release of 10-15 days time, when tunnel bottom occurs In plate 2 pressure relief groove 3, fractured rock, by compression compact, absorbs base plate 2 rock deformation, and " weak structure " that pressure relief groove 3 is formed is described Effective release is carried out to heavily stressed in roadway floor 2, has improved roadway surrounding rock stress distribution, now need to roadway floor 2 carry out grouting and reinforcing, afterwards base plate 2 pressure relief groove 3 is carried out with concrete filling and enriches, and make roadway floor 2 country rock form two " strong knots Structure "." strong-weak-strong " supporting construction of roadway floor 2, effectively tunnel control floor lift in gallery.
(4)Grouting and reinforcing is carried out to roadway's sides and top board;After roadway's sides deformation and the velocity-stabilization that crushes, In time to roadway's sides with top board carries out grouting and reinforcing it is ensured that roadway surrounding rock is chronically at steady statue.
Step(1)In to country rock implement bolting with wire mesh concretely comprise the following steps:
a)One layer of jetting cement 4 is sprayed on the rough section in tunnel;
b)Then along tunnel ring construction first row anchor pole layer, and the anchor tail end of anchor pole 1 is arranged on by jetting cement 4 by pallet 5 On;
c)The axis direction that the construction of first row anchor pole layer finishes tailing edge tunnel is constructed second row anchor pole layer, the 3rd row's anchor pole successively The anchor tail end of all of anchor pole 1 is arranged on jetting cement 4 while construction by layer ... by pallet 5;
d)Then pass through and axially with the steel wire rope of ring, the anchor tail end of all of anchor pole 1 links together along tunnel, tunnel axle To the webbed wire rope net of steel wire rope shape with ring.
The present embodiment not makees any pro forma restriction to the shape of the present invention, material, structure etc., every according to this Any simple modification, equivalent variations and modification that bright technical spirit is made to above example, belong to the technology of the present invention side The protection domain of case.

Claims (3)

1. a kind of base plate release ruggedized construction controlling deep tunnel bottom distension it is characterised in that:Including being arranged in roadway floor two The twice pressure relief groove of side and the jetting cement being injected in roadway surrounding rock surface, the within the rock in tunnel-surrounding deep is provided with some anchor poles Layer, all of anchor pole layer is uniformly arranged side by side along the axial direction in tunnel, and often row's anchor pole layer includes some along tunnel-surrounding ring To the anchor pole being evenly arranged, the anchor tail end of anchor pole is fixed with pallet, anchor pole and spray with jetting cement press fit by nut Penetrate concrete surface to be vertically arranged, connected by steel wire rope between the adjacent anchor tail end of anchor pole;Twice pressure relief groove is symmetricly set on lane The left and right sides of road base plate.
2. the construction method of a kind of base plate release ruggedized construction controlling deep tunnel bottom distension according to claim 1, its It is characterised by:Comprise the following steps:
(1)Digging laneway simultaneously carries out bolting with wire mesh:Deep tunnel excavates, and after country rock molding, implements bolting with wire mesh to country rock;
(2)Dig out twice pressure relief groove:In the roadway floor left and right sides along the axis direction in tunnel, dig out one respectively using pneumatic pick The pressure relief groove of strip, the cross section of pressure relief groove is rectangle, pressure relief groove with the boundary line of tunnel one lateral wall as line of symmetry, release The depth of groove is 2000mm, and the depth of width 800mm, wherein pressure relief groove refers to the length along pressure relief groove short transverse, pressure relief groove Width refer to pressure relief groove length in left-right direction, the length of pressure relief groove is the length in tunnel;
(3)Base plate is carried out with slip casting and concrete filling is carried out to pressure relief groove;Pressure relief groove excavates, and roadway surrounding rock deforms, through 10- After country rock release in 15 days, grouting and reinforcing is carried out to roadway floor, afterwards twice pressure relief groove is carried out with jetting cement filling and enriches;
(4)Carry out grouting and reinforcing to inside roadway's sides and top board.
3. a kind of base plate release ruggedized construction controlling deep tunnel bottom distension according to claim 2 and its construction method, It is characterized in that:Step(1)In to country rock implement bolting with wire mesh concretely comprise the following steps:
One layer of jetting cement is sprayed on the rough section in tunnel;
Then along tunnel ring construction first row anchor pole layer, and by pallet, the anchor tail end of anchor pole is arranged on jetting cement;
The axis direction that the construction of first row anchor pole layer finishes tailing edge tunnel is constructed second row anchor pole layer, the 3rd row's anchor pole successively The anchor tail end of all of for each row anchor pole is fixed on jetting cement while construction by layer ... by pallet;
Then pass through and axially with the steel wire rope of ring, the anchor tail end of all of anchor pole link together along tunnel, tunnel axially and The webbed wire rope net of steel wire rope shape of ring.
CN201610990065.4A 2016-11-10 2016-11-10 Bottom plate pressure relief and reinforcement structure for controlling floor heave of deep roadway and construction method of bottom plate pressure relief and reinforcement structure Pending CN106401609A (en)

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Cited By (4)

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CN108595807A (en) * 2018-04-15 2018-09-28 西安科技大学 A kind of computational methods of roadway floor release well width
WO2018205492A1 (en) * 2017-05-10 2018-11-15 中国矿业大学 High ground pressure laneway stress transfer method based on fracturing ring
CN109139057A (en) * 2018-10-29 2019-01-04 六盘水师范学院 A kind of coal cutting roadway bottom plate water suction pucking administering method
CN110725708A (en) * 2019-10-10 2020-01-24 三峡大学 Structure and method for reinforcing integrity and stability of tunnel surrounding rock by using cable

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018205492A1 (en) * 2017-05-10 2018-11-15 中国矿业大学 High ground pressure laneway stress transfer method based on fracturing ring
AU2017413518B2 (en) * 2017-05-10 2020-07-16 China University Of Mining And Technology Stress-transfer method in tunnel with high ground pressure based on fracturing ring
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CN108595807A (en) * 2018-04-15 2018-09-28 西安科技大学 A kind of computational methods of roadway floor release well width
CN108595807B (en) * 2018-04-15 2019-04-05 西安科技大学 A kind of calculation method of roadway floor release groove width
CN109139057A (en) * 2018-10-29 2019-01-04 六盘水师范学院 A kind of coal cutting roadway bottom plate water suction pucking administering method
CN110725708A (en) * 2019-10-10 2020-01-24 三峡大学 Structure and method for reinforcing integrity and stability of tunnel surrounding rock by using cable
CN110725708B (en) * 2019-10-10 2020-10-30 三峡大学 Structure and method for reinforcing integrity and stability of tunnel surrounding rock by using cable

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