CN206205903U - A kind of base plate release ruggedized construction of control deep tunnel bottom distension - Google Patents

A kind of base plate release ruggedized construction of control deep tunnel bottom distension Download PDF

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Publication number
CN206205903U
CN206205903U CN201621212617.0U CN201621212617U CN206205903U CN 206205903 U CN206205903 U CN 206205903U CN 201621212617 U CN201621212617 U CN 201621212617U CN 206205903 U CN206205903 U CN 206205903U
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tunnel
pressure relief
rock
relief groove
anchor pole
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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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Abstract

A kind of base plate release ruggedized construction of control deep tunnel bottom distension, including twice pressure relief groove and the jetting cement for being injected in roadway surrounding rock surface, some anchor pole layers are provided with the coal seam in tunnel-surrounding deep, 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, the anchor tail end of anchor pole passes inwardly through jetting cement and is fixed with pallet with jetting cement press fit, and anchor pole is vertically arranged with the tangential direction of jetting cement;In sum, the utility model controls deep tunnel bottom distension and surrouding rock deformation problem using base plate destressing method, on the basis of current deep tunnel bolting and grouting support, by rationally determining shape, the size of pressure relief groove, and position, improvement base plate, two help and roof rock release effect, increased secondary interstice in country rock, improve wall rock grouting effect, deep tunnel bottom distension problem can be efficiently controlled, it is ensured that deep laneway surrounding rock it is steady in a long-term.

Description

A kind of base plate release ruggedized construction of control deep tunnel bottom distension
Technical field
The utility model belongs to roadway support field, and in particular to a kind of base plate release of control deep tunnel bottom distension is reinforced Structure.
Background technology
Because the influence of tunnelling or coal seam back production destroys initial rock stress field, roadway surrounding rock stress is caused to divide again Cloth, when country rock concentrated stress exceedes Surrounding Rock Strength, country rock is plastically deformed, and is mainly shown as that tunnel roof and floor and two is helped to enclose Rock is moved to lane space, and wherein roadway floor country rock turns into bottom distension to the movement in tunnel.Generally at roadway floor In non-support or without 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 It is bad first since base plate distension i.e. the distension of bottom, roadway's sides convergence, causes roadway support entirely ineffective afterwards, therefore deep mining lane Road(Chamber)Bottom distension problem is always influence 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 being provided with the chambers such as the head of big scale fixed equipments or hoist house, if chamber is sent out The certain bottom distension of life, it will cause large scale equipment footing foundation to incline, directly influence the normal operation of equipment, or even occur stopping The situation of maintenance is produced, the hidden danger for be the normal pedestrian of coal mine roadway, transporting 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 It is Deep Soft Rock that road country rock is gradated.Roadway surrounding rock deformation amount particularly bottom distension amount is significantly increased, and bottom distension problem is more protruded. A large amount of LIMIT OF GROUND BEHAVIOR IN COAL MINE pressure site observation results show, under conditions of 600 ~ 800m of mining depth, produce the tunnel of bottom distension to account for 25% or so;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 with the increase of mining depth, bottom distension amount and its shared ratio in roof to floor convergence will gradually increase.Bottom distension is tight The tunnel of weight causes the increase of the roadway's sides amount of shifting near, 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 for whole piece tunnel.Therefore, Deep tunnel bottom distension how is efficiently controlled, the steady in a long-term of roadway floor country rock is kept, for ensureing deep mining colliery lane The normal of road has important practical significance using with mine safety production.
Utility model content
The utility model is in order to solve weak point of the prior art, there is provided a kind of simple structure, easy construction, design Rationally, the reinforced roadway device for preventing base plate bottom distension of floor lift in gallery phenomenon is efficiently controlled.
In order to solve the above technical problems, the utility model is adopted the following technical scheme that:A kind of control deep tunnel bottom distension Base plate release ruggedized construction, including be arranged in the twice pressure relief groove of roadway floor both sides and be injected in the injection on roadway surrounding rock surface Concrete, is provided with some anchor pole layers in the rock stratum in tunnel-surrounding deep, all of anchor pole layer uniformly sets side by side along the axial direction in tunnel Put, often arranging anchor pole layer includes some anchor poles being evenly arranged along tunnel-surrounding ring, and the anchor tail end of anchor pole passes inwardly through injection Concrete is simultaneously fixed with pallet with jetting cement press fit, and anchor pole is vertically arranged with the surface of jetting cement, the anchor of adjacent anchor pole Connected by steel wire rope between tail end;Twice pressure relief groove is separately positioned on the left and right sides of roadway floor.
The depth of pressure relief groove is 2000mm, and the depth of width 800mm, wherein pressure relief groove refers to along pressure relief groove short transverse Length, the width of pressure relief groove refers to the lateral length of pressure relief groove, and the length of pressure relief groove is the length in tunnel.
Using above-mentioned technical proposal, on the basis of current deep tunnel bolting and grouting support, using base plate destressing method come Control deep tunnel bottom distension, by the double square pressure relief groove in deep tunnel backplane rational position and reasonable size, passes through After the release of time in 10 ~ 15 day, roadway surrounding rock deforms, and high stress turns to deep wall rock in roadway's sides and roof and floor Move, tunnel superficial part surrouding rock stress reduction can be obviously improved roadway surrounding rock stress field;Be conducive to giving full play to holding for deep wall rock Loading capability, reduces the Support Resistance of superficial part confined pressure, so as to reduce the supporting difficulty in tunnel.After surrouding rock deformation tends towards stability, Roadway floor, two are helped and roof rock carries out grouting and reinforcing, to ensure that roadway floor, two help long-term steady with roof rock It is fixed.Deep tunnel is tunneled, and after exposure country rock carries out bolting with wire mesh, distance is met head on 5m or so, 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, is pressure relief groove line of symmetry with roadway's sides boundary line;After fractured rock takes out in pressure relief groove, in roadway floor Two " weak structure " is formed, is that floor lift in gallery reserves certain deformation space;After release, the high stress of tunnel superficial part base plate, Shifted to deep rock stratum.It is compacted and densification when there is fractured rock in the pressure relief groove of tunnel base angle, absorbs floor rocks deformation Amount, illustrates that " weak structure " is helped to roadway floor, two and the high stress of top board has carried out effective release, improves roadway floor, two The surrouding rock stress distribution situation of side and top board.After usual pressure relief groove is excavated 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 pressed through unloading Cheng Zhong, back, two help further to open, extend and extend with initial fissure in roof rock rock stratum, while occurring new Secondary interstice, causes cranny development in country rock, is conducive to the release of roadway's sides and roof strata, while being conducive to the later stage to lane Road base plate, two help and roof rock grouting and reinforcing.After base plate pressure relief groove release, slip casting is carried out to roadway floor country rock first Reinforce, carry out jetting cement filling to Double-bottom-plate pressure relief groove afterwards and enrich, two " strong structure " is formed in roadway floor country rock.Tunnel " strong-weak-strong " supporting construction of base plate, can effectively support and control the bottom distension in tunnel.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 improving the strong of country rock after slip casting Degree, while increased the supporting performance of bolting with wire mesh.Therefore the utility model, from raising deep laneway surrounding rock supporting intensity and drop Two aspects of low roadway surrounding rock stress take measures, it is ensured that deep laneway surrounding rock and bolt-grouting support system tend to balance, and reach depth Portion's roadway surrounding rock is chronically at the purpose of stabilization;
The release effect of roadway floor pressure relief groove, can use the scope in base plate superficial part terrane stress reduction area and stress value Size, and the intensity of base plate superficial part rock stratum represents that the former includes that the depth and width of pressure relief groove are relevant with pressure relief groove size, The latter is relevant with floor grouting reinforcing.Implemented using pneumatic pick at present under the technical conditions of base plate release construction, the depth of pressure relief groove Directly influence the complexity and release effect of release construction.Release effect is had influence on when pressure relief groove is shallower, when deeper then Directly increase the difficulty of construction.Release in recent years-reinforcing groove is in Pingdingshan mining area table mountain Tian An coal industry share The horizontal great Xiang of the mines such as the ore deposit of Co., Ltd one, six ore deposits, eight ore deposits and ten ore deposits and on(Under)In the tunnel of mountain, situ industrial has been carried out Experiment, effect is significant.Therefore, the utility model, with reference to numerical result, grinds on the basis of the field test of Pingdingshan Coal Mine Base plate release-reinforcing groove control deep tunnel bottom distension and its construction method is studied carefully, it is determined that the position of deep tunnel base plate pressure relief groove Put, pressure relief groove reasonable size, effectively improve deep laneway surrounding rock stress distribution, improve traditional bolt-grouting support effect Really, supporting and the maintenance cost of deep tunnel are reduced, it is ensured that the steady in a long-term and colliery of deep laneway surrounding rock it is normal Production.
In sum, the utility model controls deep tunnel bottom distension and surrouding rock deformation problem using base plate destressing method, On the basis of current deep tunnel bolting and grouting support, by rationally determining shape, the size of pressure relief groove, and position, Improve base plate, two help with roof rock release effect, increased secondary interstice in country rock, improve wall rock grouting effect, can be with Efficiently control deep tunnel bottom distension problem, it is ensured that deep laneway surrounding rock it is steady in a long-term.
Brief description of the drawings
Fig. 1 is the utility model bolt-spary supports tunnel profile;
Fig. 2 is the utility model tunnel horizontal layout schematic diagram;
Fig. 3 is the utility model tunnel axial section.
Specific embodiment
As Figure 1-3, the device of the base plate release ruggedized construction of a kind of control deep tunnel bottom distension of the present utility model, Including being arranged in the twice pressure relief groove 3 of roadway floor both sides and being injected in the jetting cement 4 on roadway surrounding rock surface, tunnel-surrounding deep Coal seam in be provided with some anchor poles layer, all of anchor pole layer is uniformly arranged side by side along the axial direction in tunnel, often arranges anchor pole layer bag The some anchor poles 1 being evenly arranged along tunnel-surrounding ring are included, the anchor tail end of anchor pole 1 passes inwardly through jetting cement 4 and is fixed with With the pallet 5 of the press fit of jetting cement 4, anchor pole 1 is vertically arranged with the surface of jetting cement 4, between the anchor tail end of adjacent anchor pole 1 Connected by steel wire rope;Twice pressure relief groove 3 is separately positioned on the left and right sides of roadway floor 2.
A kind of construction method of the base plate release ruggedized construction of control deep tunnel bottom distension, comprises the following steps:
(1)Digging laneway simultaneously carries out bolting with wire mesh:Deep tunnel is excavated, and after country rock shaping, anchor net branch is implemented to country rock Shield;
(2)Dig out twice pressure relief groove;Bolting with wire mesh into after lane, being that control roadway floor 2 occurs bottom distension, in roadway floor 2 both sides dig out a pressure relief groove for strip 3 using pneumatic pick respectively along the length direction in tunnel, and the cross section of pressure relief groove 3 is length Square, with the boundary line of the lateral wall of tunnel one as line of symmetry, the depth of pressure relief groove 3 is 2000mm, width 800mm to pressure relief groove 3, wherein The depth of pressure relief groove 3 refers to the length along the short transverse of pressure relief groove 3, and the width of pressure relief groove 3 refers to the lateral length of pressure relief groove 3, The length of pressure relief groove 3 is the length in tunnel.
(3)Concrete filling is carried out to the slip casting of base plate 2 and to pressure relief groove 3;By the release of 10-15 days time, when there is tunnel bottom Fractured rock absorbs the rock deformation of base plate 2 by compression compact in the pressure relief groove 3 of plate 2, illustrates " weak structure " that pressure relief groove 3 is formed Effective release is carried out to the high stress in roadway floor 2, roadway surrounding rock stress distribution has been improved, now needed to roadway floor 2 carry out grouting and reinforcing, carry out concrete filling to the pressure relief groove 3 of base plate 2 afterwards and enrich, and the country rock of roadway floor 2 is formed 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, Grouting and reinforcing is carried out to roadway's sides and top board in time, it is ensured that roadway surrounding rock is chronically at stable state.
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 injection by pallet 5 On concrete 4;
c)First row anchor pole layer construction finish after along the axis direction in tunnel construct successively second row anchor pole layer, the 3rd row's anchor , by pallet 5 be arranged on jetting cement 4 the anchor tail end of all of anchor pole 1 while construction by bar layer ...;
d)Then the anchor tail end of all of anchor pole 1 is linked together with the steel wire rope of ring axially by along tunnel, lane Road axial direction and the webbed wire rope net of steel wire rope shape of ring.
The present embodiment not makees any formal limitation, every foundation to shape of the present utility model, material, structure etc. Any simple modification, equivalent variations and modification that technical spirit of the present utility model is made to above example, belong to this reality With the protection domain of new technique scheme.

Claims (2)

1. a kind of base plate release ruggedized construction for 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 for being injected in roadway surrounding rock surface, are provided with some anchor poles in the rock stratum in tunnel-surrounding deep Layer, all of anchor pole layer is uniformly arranged side by side along the axial direction in tunnel, and often arranging anchor pole layer includes some along tunnel-surrounding ring To the anchor pole being evenly arranged, the anchor tail end of anchor pole passes inwardly through jetting cement and is fixed with pallet with jetting cement press fit, Anchor pole is vertically arranged with the surface of jetting cement, is connected by steel wire rope between the anchor tail end of adjacent anchor pole;Twice pressure relief groove point The left and right sides of roadway floor is not arranged on.
2. a kind of base plate release ruggedized construction for controlling deep tunnel bottom distension according to claim 1, it is characterised in that:Unload The depth of indent is 2000mm, and the depth of width 800mm, wherein pressure relief groove refers to the length along pressure relief groove short transverse, release The width of groove refers to the lateral length of pressure relief groove, and the length of pressure relief groove is the length in tunnel.
CN201621212617.0U 2016-11-10 2016-11-10 A kind of base plate release ruggedized construction of control deep tunnel bottom distension Active CN206205903U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108194097A (en) * 2017-12-29 2018-06-22 山东科技大学 A kind of convex energy-absorbing bearing structure for preventing floor lift in gallery
CN108222961A (en) * 2017-12-29 2018-06-29 山东科技大学 A kind of administering method for squeezing flow model bottom distension
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
CN110130958A (en) * 2019-05-16 2019-08-16 中国神华能源股份有限公司 A kind of control method of gob side entry retaining pucking

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108194097A (en) * 2017-12-29 2018-06-22 山东科技大学 A kind of convex energy-absorbing bearing structure for preventing floor lift in gallery
CN108222961A (en) * 2017-12-29 2018-06-29 山东科技大学 A kind of administering method for squeezing flow model bottom distension
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
CN110130958A (en) * 2019-05-16 2019-08-16 中国神华能源股份有限公司 A kind of control method of gob side entry retaining pucking

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