CN107448205A - The large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel - Google Patents
The large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910001919 chlorite Inorganic materials 0.000 title claims abstract description 37
- 229910052619 chlorite group Inorganic materials 0.000 title claims abstract description 37
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 64
- 239000002689 soil Substances 0.000 claims abstract description 4
- 239000004567 concrete Substances 0.000 claims description 46
- 239000011378 shotcrete Substances 0.000 claims description 38
- 239000011435 rock Substances 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 230000007480 spreading Effects 0.000 claims description 18
- 238000003892 spreading Methods 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000009412 basement excavation Methods 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 210000000481 breast Anatomy 0.000 claims description 3
- 238000007363 ring formation reaction Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 210000003205 muscle Anatomy 0.000 claims description 2
- 210000005239 tubule Anatomy 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 6
- 241000923606 Schistes Species 0.000 description 4
- 238000000280 densification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 101100366060 Caenorhabditis elegans snap-29 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/04—Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention relates to Tunnel Engineering technical field, and in particular to a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel.Methods described is based on three stepped annulars excavate provided core soil method, under advance support carry out tunnel dig and supporting, wherein tunnel arch, use double-deck steelframe at abutment wall, and carry out graded supporting, corresponding deformation allowance is 50 ~ 90cm when wherein first layer steelframe performs, the second layer steelframe when performing corresponding deformation allowance be 25 ~ 45cm, use individual layer steelframe at inverted arch.The method of the invention is while chlorite quartz-schist aquifer water-bearing stratum longspan tunnel large deformation requirement is met, and can ensures supporting construction safety, reach the purpose do not invaded limit, do not change arch, can solve the problem that the large deformation control problem that longspan tunnel is built in current chlorite quartz-schist aquifer water-bearing stratum.
Description
Technical field
The present invention relates to Tunnel Engineering technical field, and in particular to a kind of chlorite quartz-schist aquifer water-bearing stratum large span tunnel
The large deformation control method in road.
Background technology
Chlorite schist is mingled with a small amount of quartz vein（Quartz content is less than 20%）, normally referred to as chlorite quartz-schist.
Such rock mass strength is low, and Rock Mass Integrality is poor, in cataclastic shape or granular media shape, although the stability on purer chlorite schist stratum will
It is good, but in aquifer water-bearing stratum, chlorite schist is disintegrated into branch so that and rock mass is extremely broken, tunnel surrounding self-stable ability
Extreme difference, serious large deformation is likely occurred in work progress, is especially in the longspan tunnel on stress level stratum higher,
It is big to the range of disturbance of country rock plus excavating because its Surrounding Rock Strength stress is smaller, if technical measures are improper, it is easy to cause
Tunnel support deformation invades limit, the peeling of gunite concrete cracking, steelframe twisting and breaking, secondary lining cracking chip off-falling or even collapses, faces upward
Plow and split protuberance, cause repeatedly to change doming effect, have a strong impact on construction quality, safety, progress and construction costs.Therefore, selection is closed
The large deformation control method of reason is the key that high-ground stress chlorite quartz-schist aquifer water-bearing stratum tunnel is successfully built.
Theory is controlled based on different large deformation, the large deformation control measure proposed at present mainly there are following a few classes：(1) add
Strong supporting：Increase gunite concrete and secondary lining thickness, strengthen interim inverted arch, increase profile steel frame model, using long anchor pole,
Lock pin anchor tube (bar) and multiple supporting etc.；(2) yield supporting：Increasing deformation allowance, use can contracting formula steelframe and contractibility length
Anchor cable and setting prearrangement of deformation amount cushion etc.；(3) advance reinforcement：Shed-pipe Advanced Support, advanced tubule, pre-grouting etc..Engineering
It was verified that being lost more than gain by above-mentioned a certain measure with controlling the large deformation of soft rock tunnel completely merely, and lead to
Often selection using many kinds of measures and large deformation control method.But due to the specific geology in conventional every tunnel, load situation
Etc. inconsistent, existing large deformation control method (including control measure and parameter) is also different.Similarly, in chlorite stone
Tunnel is built in English schist aquifer water-bearing stratum, because of situations such as its geology and the particularity of load, is still lacked at present a set of on green
The large deformation control method of mudstone quartz-schist aquifer water-bearing stratum longspan tunnel, and can ensures while large deformation requirement is met
Supporting construction safety, reaches the purpose do not invaded limit, do not change arch.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of big change of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel
Shape control method, and can ensures supporting construction safety while large deformation requirement is met, reaches the mesh do not invaded limit, do not change arch
's.It can solve the problem that the large deformation control problem that tunnel is built in current chlorite quartz-schist aquifer water-bearing stratum.
The present invention is achieved by the following technical solutions：
A kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel, methods described are used for wall rock condition
For the large deformation control in the work progress of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel of the quartz content less than 20%；
Methods described by three stepped annulars excavate provided core soil method based on, under advance support carry out tunnel dig and supporting,
During the supporting performs, double-deck HK200b profile steel frames are used at tunnel arch, abutment wall, and carry out graded supporting, institute
Graded supporting is stated first to perform first layer steelframe, then performs second layer steelframe；During the graded supporting, described first
Corresponding deformation allowance is 50 ~ 90cm when layer steelframe performs, and corresponding deformation allowance is when the second layer steelframe performs
25 ~ 45cm, individual layer HK200b profile steel frames are used at inverted arch.
.By using big deformation allowance（50~90cm）Bilayer HK200b profile steel frames strong supporting at+arch, abutment wall+point
The method of secondary supporting, the more deformation spaces of supporting construction are on the one hand given, avoid its deformation from invading limit；On the other hand, first perform
First layer steelframe, making it, surrouding rock stress is released in its deformation process, while steelframe behind country rock as stress release layer
Also densification is obtained, load-carrying capacity of surrounding rock is improved；Furthermore second layer steelframe is performed, reinforcement, Er Qie can be given supporting construction
In supporting and country rock interaction process, country rock obtains further densification, and load-carrying capacity of surrounding rock is further enhanced, and is beneficial to subtract
The loading sharing ratio of small supporting construction.It is consequently formed supporting construction to carry jointly with densification area country rock, obtains serious deformation
To control.
Further, the longspan tunnel is single hole Three-Lane Highway Tunnel, or other tunnels with identical span.
Further, the first layer steelframe and the second layer steelframe are respectively provided with double steel bar mesh sheet.
Further, the large deformation control method includes advance support successively, the construction of top bar first layer steelframe, in
The construction of step first layer steelframe, upper, middle step second layer steelframe construction, the construction of get out of a predicament or an embarrassing situation first layer and second layer steelframe,
Radial grouting construction, inverted arch construction, Second Lining Construction, inverted arch refilling step.
Further, methods described is specially：
(1) advance support：Using double grouting small pilot pipe, ring spacing is 30 ~ 40cm, and every 2 ~ 3 Pin steelframes perform 1 ring；
(2) construction of top bar first layer steelframe：Digged on the basis of the design profile line of tunnel cross-section, prearrangement of deformation amount
Amount uses 50 ~ 90cm, sets up top bar first layer steelframe, sets the lock pin anchor of first layer steelframe at top bar arch springing immediately after
Pipe, finally carry out performing for top bar first layer gunite concrete；
(3) construction of step first layer steelframe in：The construction of step first layer steelframe in being carried out along top bar excavation contour line,
Middle step or so staggers 3 ~ 4 Pin, after middle step first layer steelframe spreading, sets first layer steelframe at middle step arch springing immediately after
Lock pin anchor tube, step first layer gunite concrete performs in finally carrying out；
(4) on, the middle step second layer steelframe construction：As deformation allowance 25 ~ 45cm of residue, immediately following step in first layer, one
Secondary property performs, middle step second layer steelframe, and sets the lock pin of second layer steelframe at step arch springing in second layer steelframe immediately
Anchor tube, finally carry out, middle step second layer gunite concrete performs；
(5) get out of a predicament or an embarrassing situation the construction of first layer and second layer steelframe：Get out of a predicament or an embarrassing situation after excavation, two layers steelframe of carrying out getting out of a predicament or an embarrassing situation by several times
Perform, spreading first is got out of a predicament or an embarrassing situation first layer steelframe, and sets the lock pin anchor tube of first layer steelframe at foundation of getting out of a predicament or an embarrassing situation immediately, complete
After into the performing of first layer gunite concrete of getting out of a predicament or an embarrassing situation, spreading is got out of a predicament or an embarrassing situation second layer steelframe, and is set immediately at foundation of getting out of a predicament or an embarrassing situation
The lock pin anchor tube of second layer steelframe；Finally carry out getting out of a predicament or an embarrassing situation the performing of second layer gunite concrete；
(6) radial grouting is constructed：After the completion of the construction of second layer steelframe, radial grouting reinforcing is carried out to country rock；Tunnel excavation
Initial stage is comparatively dense due to country rock, it is difficult to realizes effective slip casting.After the completion of second layer steelframe performs, country rock compactness is relatively excavated
Initial stage has varied widely, and now country rock radial grouting effect will be improved；
(7) inverted arch is constructed：3 ~ 4m of construction every time, inverted arch and backfill bosom are 3 ~ 4m, and inverted arch makes at arch and abutment wall after excavating
First layer steelframe closing cyclization, using individual layer steelframe as steelframe at inverted arch, and perform gunite concrete at inverted arch；In addition,
Steelframe also functions to sealing process to the second layer steelframe at arch and abutment wall at inverted arch, equivalent to the bilayer at arch and abutment wall just
Phase supporting is seated in the individual layer preliminary bracing at inverted arch；
(8) Second Lining Construction：After tunnel gunite concrete inner surface lays splash guard, the construction of secondary lining is carried out；Often
Plate 10 ~ 12m of Second Lining Construction, secondary lining uses 80 ~ 90 cm thickness C35 armored concrete at arch and abutment wall, two at inverted arch
Secondary lining cutting uses 90 ~ 100cm thickness C35 armored concrete, and the secondary lining reinforcing bar is using 25 ~ 28mm of Φ reinforcing bars as master
Muscle, spacing 20cm；
(9) inverted arch backfills；
(10) under grouting small pilot pipe supporting, repeat step (2) ~ (9), it is big to complete chlorite quartz-schist aquifer water-bearing stratum
The construction in span tunnel.
Further, step（2）Specially：Digged on the basis of the design profile line of tunnel cross-section, prearrangement of deformation amount
Amount uses 50 ~ 90cm, 4.5 ~ 5.5m of top bar height, wide 17 ~ 18m, top bar 3 ~ 5m of length, sets up top bar first layer steelframe,
1 Pin, steelframe 60 ~ 70cm of spacing are set up every time, are set the lock pin anchor tube of first layer steelframe at top bar arch springing immediately after, are double
Pipe with small pipe diameter lock pin anchor tube is arranged, finally carries out performing for top bar first layer gunite concrete.
Further, step（3）Specially：Excavated along top bar excavation contour line centering step, middle shoulder height
3.0 ~ 3.5m, middle 15 ~ 20m of length of bench, when middle step first layer steelframe is constructed, stagger 3 ~ 4 Pin steelframes at left and right sides of middle step,
Per each Pin steelframes of spreading 2 ~ 3 in side, the lock pin anchor tube of first layer steelframe at middle step arch springing is set after steelframe spreading immediately, is double
Pipe with small pipe diameter lock pin anchor tube is arranged, step first layer gunite concrete performs in finally carrying out.
Further, step（4）Specially：As deformation allowance 25 ~ 45cm of residue, immediately following step in first layer, one
Secondary property performs, middle step second layer steelframe, and construct 4 Pin, steelframe 60 ~ 70cm of spacing every time, and between first and second layer of steelframe of holding
Every 2 ~ 3 Pin steelframes, the lock pin anchor tube of second layer steelframe at middle step arch springing is set immediately after, specifically at left and right sides of middle step
40 ~ 60cm locates every 2 Pin steelframes and performs 1 Large Diameter Pipeline lock pin anchor tube above arch springing, and 30 ° obliquely ~ 50 ° set, by steel plate and
Adjacent two Pin steelframes firmly weld, and realize that Large Diameter Pipeline lock pin anchor tube is acted on the rest of upper, middle step second layer steelframe.It is most laggard
On row, middle step second layer gunite concrete performs.
Because country rock is weak, pressure from surrounding rock is big, after upper, middle step first layer steelframe performs, sunk at upper, middle step arch springing
Drop amount is big, and the rate of settling is fast.After upper, middle step second layer steelframe performs and sets Large Diameter Pipeline lock pin anchor tube, at tunnel arch foot
The rate of settling can slow down at once.Moreover, constructed compared to existing pilot heading method, if first layer steelframe is considered as into stress release
Layer, stress release layer will be used as permanent support in the present invention, and pilot heading method can be avoided to be torn open in constructing to stress release layer
Remove and the destruction to densification area country rock, thus not only reduce the disturbance to country rock, and after performing second layer steelframe, country rock is held
Carrying power and stability will be further enhanced.In addition, efficiency of construction and construction safety can also be guaranteed.
Further, step（5）Specially：The excavation got out of a predicament or an embarrassing situation first, get out of a predicament or an embarrassing situation high 3 ~ 4m, and length 6 of getting out of a predicament or an embarrassing situation ~
8m, two layers steelframe of then carrying out getting out of a predicament or an embarrassing situation by several times are performed, and the left and right sides of getting out of a predicament or an embarrassing situation is staggered 3 ~ 4 Pin steelframes, per side the during construction
One layer and second layer steelframe stagger 2 ~ 3 Pin steelframes, and first layer is existing, then follows up simultaneously；Got out of a predicament or an embarrassing situation first layer steelframe in spreading
Afterwards, the lock pin anchor tube of first layer steelframe at foundation of getting out of a predicament or an embarrassing situation is set immediately, locks pin anchor tube for double pipe with small pipe diameter, and complete to get out of a predicament or an embarrassing situation
First layer gunite concrete performs；Then spreading is got out of a predicament or an embarrassing situation second layer steelframe, and sets the second layer at foundation of getting out of a predicament or an embarrassing situation immediately
The lock pin anchor tube of steelframe, specifically every 2 Pin steelframes perform 1 Large Diameter Pipeline lock pin anchor at 40 ~ 60cm above both sides foundation of getting out of a predicament or an embarrassing situation
Pipe, 30 ° obliquely ~ 50 ° set, and the second layer gunite concrete that finally carries out getting out of a predicament or an embarrassing situation performs.
Further, the diameter of pipe with small pipe diameter lock pin anchor tube≤50 mm, long 3 ~ 5m, the Large Diameter Pipeline lock pin anchor tube
The mm of diameter >=89, long 4 ~ 7m.
The advantageous effects of the present invention：
Large deformation control method for still lacking chlorite quartz-schist aquifer water-bearing stratum longspan tunnel at present, it is of the present invention
Method compensate for this blank, solve the large deformation control hardly possible that longspan tunnel is built in chlorite quartz-schist aquifer water-bearing stratum
Topic, there is provided large deformation control method can be that the design and construction of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel from now on carry
It is provided with power guidance.
The characteristics of present invention is directed to chlorite quartz-schist aquifer water-bearing stratum, it is proposed that chlorite quartz-schist aquifer water-bearing stratum is big
The corresponding large deformation control method in span tunnel, double-deck HK200b shaped steel steel is carried out after digging 50 ~ 90cm especially with tunnel
Frame, the measure of graded supporting and parameter, while surrouding rock stress is discharged and strengthening supporting is to ensure that supporting construction is safe, again
Surrouding rock deformation can be constrained to avoid invading limit.Moreover, construction costs can also be effectively controlled.
Brief description of the drawings
Fig. 1 is the serious deformation control method schematic diagram in embodiment 1；
Fig. 2 is the layout diagram that Large Diameter Pipeline locks pin anchor tube in embodiment 1；
Reference：1- grouting small pilot pipes, 2- top bar first layer steelframes, the lock of first layer steelframe at 3- top bar arch springings
Pin anchor tube, 4- top bar first layer gunite concretes, step first layer steelframe in 5-, first layer steelframe at step arch springing in 6-
Pin anchor tube is locked, step first layer gunite concrete in 7-, 8- is upper, middle step second layer steelframe, the second layer at step arch springing in 9-
The lock pin anchor tube of steelframe, 10- is upper, middle step second layer gunite concrete, and 11- gets out of a predicament or an embarrassing situation first layer steelframe, and 12- gets out of a predicament or an embarrassing situation foundation
Locate the lock pin anchor tube of first layer steelframe, 13- gets out of a predicament or an embarrassing situation first layer gunite concrete, and 14- gets out of a predicament or an embarrassing situation second layer steelframe, and 15- leaves office
The lock pin anchor tube of second layer steelframe at rank foundation, 16- get out of a predicament or an embarrassing situation second layer gunite concrete, steelframe at 17- inverted arch, 18- inverted arch
Locate gunite concrete, 19- splash guards, secondary lining at 20- arch and abutment wall, secondary lining at 21- inverted arch.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiied
Change, equivalent method and scheme.Further, in order that the public has a better understanding to the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
Embodiment 1
The large deformation control method of a kind of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel provided by the invention, with three steps
Based on Ring Cutting provided core soil method, as shown in figure 1, under advance support carry out tunnel dig and supporting performs, its
Double-deck HK200b profile steel frames are used at middle tunnel arch, abutment wall, and carry out graded supporting, wherein first layer steelframe performs phase
The deformation allowance answered is 50 ~ 90cm, the second layer steelframe when performing corresponding deformation allowance be 25 ~ 45cm, used at inverted arch
Individual layer HK200b profile steel frames, every layer of steelframe correspond to the double-deck reinforced mesh of Φ 8, grid 20 × 20cm of spacing, specific bag
Include following steps：
(1) advance support：The grouting small pilot pipes 1 of Φ 50 grown using double 3.5m, ring spacing are 40cm, every 2 Pin steelframes
Perform 1 ring.
(2) construction of top bar first layer steelframe：Digged, reserved on the basis of the design profile line of tunnel cross-section
Deflection uses 50 ~ 90cm, top bar height 5.3m, wide 17.7m, the long 5m of top bar, sets up top bar first layer steelframe 2, often
1 Pin HK200b shaped steel of secondary erection, steelframe spacing 60cm, sets the lock pin anchor tube of first layer steelframe at top bar arch springing immediately after
3, it is that the long pipe with small pipe diameter of Φ 50 of double 4m locks pin anchor tube, 8 altogether, finally carrying out top bar first layer gunite concrete 4, (28cm is thick
Performing C25).
(3) construction of step first layer steelframe in：Excavated along top bar excavation contour line centering step, middle step
Height 3.5m, middle length of bench 20m, when middle step first layer steelframe 5 is constructed, middle step or so staggers 4 Pin, per each spreading in side
2 Pin HK200b profile steel frames, the lock pin anchor tube 6 of first layer steelframe at middle step arch springing is set after steelframe spreading immediately, to be double
The long pipe with small pipe diameter of the Φ 50 lock pin anchor tubes of 4m, 8 altogether, step first layer gunite concrete 7 (28cm thickness C25's) applies in finally carrying out
Do.
(4) on, the middle step second layer steelframe construction：As deformation allowance 25 ~ 45cm of residue, immediately following platform in first layer
Rank, disposably perform, middle step second layer steelframe 8, construct 4 Pin, steelframe spacing 60cm every time, and keeps first and second layer of steel
The Pin steelframes of frame interval 2 ~ 3, the lock pin anchor tube 9 of second layer steelframe at middle step arch springing are set immediately after, specifically in middle step two
50cm or so every 2 Pin steelframes in place perform the long Large Diameter Pipelines of the Φ 108 lock pin anchor tubes of 1 6m above the arch springing of side, and 45 ° set obliquely, its
Specific layout diagram realizes Large Diameter Pipeline lock pin anchor as shown in Fig. 2 firmly welded by 20mm steel plates and adjacent two Pin steelframes
Pipe is acted on the rest of upper, middle step second layer steelframe, is finally carried out, (28cm is thick for middle step second layer gunite concrete 10
Performing C25).
(5) get out of a predicament or an embarrassing situation the construction of first layer and second layer steelframe：The excavation got out of a predicament or an embarrassing situation first, get out of a predicament or an embarrassing situation high 3.6m,
Got out of a predicament or an embarrassing situation long 8m, and two layers steelframe of then carrying out getting out of a predicament or an embarrassing situation by several times performs, and the left and right sides of getting out of a predicament or an embarrassing situation is staggered 4 Pin steelframes, is applied per side
Man-hour first layer and second layer steelframe stagger 3 Pin steelframes, and first layer is existing, then follows up simultaneously；Got out of a predicament or an embarrassing situation first layer in spreading
After steelframe 11, the lock pin anchor tube 12 of first layer steelframe at foundation of getting out of a predicament or an embarrassing situation is set immediately, is that the long pipe with small pipe diameter of Φ 50 of double 4m locks pin
Anchor tube, 8 altogether, and complete the performing of first layer gunite concrete 13 (28cm thickness C25) of getting out of a predicament or an embarrassing situation.Then spreading gets out of a predicament or an embarrassing situation
Two layers of steelframe 14, and the lock pin anchor tube 15 of second layer steelframe at foundation of getting out of a predicament or an embarrassing situation is set immediately, specifically in both sides foundation of getting out of a predicament or an embarrassing situation
The every 2 Pin steelframes in top 50cm or so place perform the long Large Diameter Pipelines of the Φ 108 lock pin anchor tubes of 1 6m, and 45 ° set obliquely, its specific cloth
If schematic diagram is as shown in Figure 2.Finally carry out getting out of a predicament or an embarrassing situation the performing of second layer gunite concrete 16 (28cm thickness C25).
(6) radial grouting is constructed：After the completion of the construction of second layer steelframe, radial grouting reinforcing is carried out to country rock, using 4m
The long slip casting ductules of Φ 50,1.5 × 1.5m of spacing.
(7) inverted arch is constructed：Construction 4m every time, inverted arch and backfill bosom are 3.6m, and inverted arch makes arch and abutment wall after excavating
The first layer steelframe closing cyclization at place, using individual layer steelframe as steelframe at inverted arch 17, and performs gunite concrete 18 at inverted arch
(28cm thickness C25).In addition, steelframe 17 also functions to sealing process to the second layer steelframe at arch and abutment wall at inverted arch, equivalent to
Double-deck preliminary bracing at arch and abutment wall is seated in the individual layer preliminary bracing at inverted arch.
(8) Second Lining Construction：After tunnel gunite concrete inner surface lays splash guard 19, secondary lining is carried out
Construction.Per plate Second Lining Construction 12m, secondary lining 20 uses 80cm thickness C35 armored concrete at arch and abutment wall, at inverted arch
Secondary lining 21 uses 100cm thickness C35 armored concrete, the secondary lining reinforcing bar using the reinforcing bars of Φ 28 as cage bar,
Away from 20cm.
(9) inverted arch backfill is backfilled using C20 plain concretes.
(10) under the supporting of grouting small pilot pipe 1, repeat step (2) ~ (9), chlorite quartz-schist is completed aqueously
The construction of layer longspan tunnel.
As described above, when chlorite quartz-schist aquifer water-bearing stratum builds longspan tunnel, can be made using the above method
The large deformation in tunnel is controlled, and the deformation in tunnel while ensuring that supporting construction is safe, can be avoided to invade limit, accomplishes not invade
Limit, arch is not changed, and construction costs can also be effectively controlled.
Claims (10)
- A kind of 1. large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel, it is characterised in that the side Method is used in the work progress that wall rock condition is chlorite quartz-schist aquifer water-bearing stratum longspan tunnel of the quartz content less than 20% Large deformation control；Methods described carries out tunnel based on three stepped annulars excavate provided core soil method under advance support Dig and supporting, during the supporting perform, double-deck HK200b profile steel frames are used at tunnel arch, abutment wall, are gone forward side by side Then row graded supporting, the graded supporting perform second layer steelframe first to perform first layer steelframe；In the graded supporting mistake Cheng Zhong, corresponding deformation allowance is 50 ~ 90cm when the first layer steelframe performs, and the second layer steelframe is corresponding when performing Deformation allowance is 25 ~ 45cm, and individual layer HK200b profile steel frames are used at inverted arch.
- 2. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 1, Characterized in that, the longspan tunnel is single hole Three-Lane Highway Tunnel, or other tunnels with identical span.
- 3. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 1, Characterized in that, the first layer steelframe and the second layer steelframe are respectively provided with double steel bar mesh sheet.
- 4. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 1, Characterized in that, the large deformation control method includes advance support, the construction of top bar first layer steelframe, middle step successively The construction of one layer of steelframe, upper, middle step second layer steelframe construction, the construction of get out of a predicament or an embarrassing situation first layer and second layer steelframe, is radially noted Slurry construction, inverted arch construction, Second Lining Construction, inverted arch refilling step.
- 5. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 1, Characterized in that, methods described is specially：(1) advance support：Using double grouting small pilot pipe, ring spacing is 30 ~ 40cm, and every 2 ~ 3 Pin steelframes perform 1 ring；(2) construction of top bar first layer steelframe：Digged on the basis of the design profile line of tunnel cross-section, prearrangement of deformation amount Amount uses 50 ~ 90cm, sets up top bar first layer steelframe, sets the lock pin anchor of first layer steelframe at top bar arch springing immediately after Pipe, finally carry out performing for top bar first layer gunite concrete；(3) construction of step first layer steelframe in：The construction of step first layer steelframe in being carried out along top bar excavation contour line, Middle step or so staggers 3 ~ 4 Pin, after middle step first layer steelframe spreading, sets first layer steelframe at middle step arch springing immediately after Lock pin anchor tube, step first layer gunite concrete performs in finally carrying out；(4) on, the middle step second layer steelframe construction：As deformation allowance 25 ~ 45cm of residue, immediately following step in first layer, one Secondary property performs, middle step second layer steelframe, and sets the lock pin of second layer steelframe at step arch springing in second layer steelframe immediately Anchor tube, finally carry out, middle step second layer gunite concrete performs；(5) get out of a predicament or an embarrassing situation the construction of first layer and second layer steelframe：Get out of a predicament or an embarrassing situation after excavation, two layers steelframe of carrying out getting out of a predicament or an embarrassing situation by several times Perform, spreading first is got out of a predicament or an embarrassing situation first layer steelframe, and sets the lock pin anchor tube of first layer steelframe at foundation of getting out of a predicament or an embarrassing situation immediately, complete After into the performing of first layer gunite concrete of getting out of a predicament or an embarrassing situation, spreading is got out of a predicament or an embarrassing situation second layer steelframe, and is set immediately at foundation of getting out of a predicament or an embarrassing situation The lock pin anchor tube of second layer steelframe；Finally carry out getting out of a predicament or an embarrassing situation the performing of second layer gunite concrete；(6) radial grouting is constructed：After the completion of the construction of second layer steelframe, radial grouting reinforcing is carried out to country rock；(7) inverted arch is constructed：3 ~ 4m of construction every time, inverted arch and backfill bosom are 3 ~ 4m, and inverted arch makes at arch and abutment wall after excavating First layer steelframe closing cyclization, using individual layer steelframe as steelframe at inverted arch, and perform gunite concrete at inverted arch；In addition, Steelframe also functions to sealing process to the second layer steelframe at arch and abutment wall at inverted arch, equivalent to the bilayer at arch and abutment wall just Phase supporting is seated in the individual layer preliminary bracing at inverted arch；(8) Second Lining Construction：After tunnel gunite concrete inner surface lays splash guard, the construction of secondary lining is carried out；Often Plate 10 ~ 12m of Second Lining Construction, secondary lining uses 80 ~ 90 cm thickness C35 armored concrete at arch and abutment wall, two at inverted arch Secondary lining cutting uses 90 ~ 100cm thickness C35 armored concrete, and the secondary lining reinforcing bar is using 25 ~ 28mm of Φ reinforcing bars as master Muscle, spacing 20cm；(9) inverted arch backfills；(10) under grouting small pilot pipe supporting, repeat step (2) ~ (9), it is big to complete chlorite quartz-schist aquifer water-bearing stratum The construction in span tunnel.
- 6. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 5, Characterized in that, step（2）Specially：Digged on the basis of the design profile line of tunnel cross-section, deformation allowance uses 50 ~ 90cm, 4.5 ~ 5.5m of top bar height, wide 17 ~ 18m, top bar 3 ~ 5m of length, sets up top bar first layer steelframe, each frame If 1 Pin, steelframe 60 ~ 70cm of spacing, the lock pin anchor tube of first layer steelframe at top bar arch springing is set immediately after, is double tubule Pin anchor tube is locked in footpath, finally carries out performing for top bar first layer gunite concrete.
- 7. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 5, Characterized in that, step（3）Specially：Excavated along top bar excavation contour line centering step, middle shoulder height 3.0 ~ 3.5m, middle 15 ~ 20m of length of bench, when middle step first layer steelframe is constructed, stagger 3 ~ 4 Pin steelframes at left and right sides of middle step, per side Each Pin steelframes of spreading 2 ~ 3, the lock pin anchor tube of first layer steelframe at middle step arch springing is set after steelframe spreading immediately, to be double small Caliber locks pin anchor tube, and step first layer gunite concrete performs in finally carrying out.
- 8. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 5, Characterized in that, step（4）Specially：As deformation allowance 25 ~ 45cm of residue, immediately following step in first layer, disposably apply Do, middle step second layer steelframe, construct 4 Pin, steelframe 60 ~ 70cm of spacing every time, and keeps first and second layer of steelframe interval 2 ~ 3 Pin steelframes, the lock pin anchor tube of second layer steelframe at middle step arch springing are set immediately after, specifically the arch springing at left and right sides of middle step Every 2 Pin steelframes perform 1 Large Diameter Pipeline lock pin anchor tube at 40 ~ 60cm of top, and 30 ° obliquely ~ 50 ° set, by steel plate with it is adjacent Two Pin steelframes firmly weld, and realize that Large Diameter Pipeline lock pin anchor tube is acted on the rest of upper, middle step second layer steelframe, finally carry out It is upper, middle step second layer gunite concrete to perform.
- 9. a kind of large deformation control method of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel according to claim 5, Characterized in that, step（5）Specially：The excavation got out of a predicament or an embarrassing situation first, get out of a predicament or an embarrassing situation high 3 ~ 4m, and get out of a predicament or an embarrassing situation long 6 ~ 8m, then By several times get out of a predicament or an embarrassing situation the performing of two layers steelframe, and the left and right sides of getting out of a predicament or an embarrassing situation is staggered 3 ~ 4 Pin steelframes, the first layer and the during construction per side Two layers of steelframe stagger 2 ~ 3 Pin steelframes, and first layer is existing, then follows up simultaneously；After spreading gets out of a predicament or an embarrassing situation first layer steelframe, beat immediately The lock pin anchor tube of first layer steelframe at step foundation is set, locks pin anchor tube for double pipe with small pipe diameter, and complete first layer spray of getting out of a predicament or an embarrassing situation Penetrate performing for concrete；Then spreading is got out of a predicament or an embarrassing situation second layer steelframe, and sets the lock of second layer steelframe at foundation of getting out of a predicament or an embarrassing situation immediately Pin anchor tube, specifically every 2 Pin steelframes perform 1 Large Diameter Pipeline lock pin anchor tube at 40 ~ 60cm above both sides foundation of getting out of a predicament or an embarrassing situation, obliquely 30 ° ~ 50 ° set, and the second layer gunite concrete that finally carries out getting out of a predicament or an embarrassing situation performs.
- 10. according to a kind of any one of claim 6-9 large deformation of chlorite quartz-schist aquifer water-bearing stratum longspan tunnel Control method, it is characterised in that the diameter of pipe with small pipe diameter lock pin anchor tube≤50 mm, long 3 ~ 5m, the Large Diameter Pipeline lock pin anchor tube The mm of diameter >=89, long 4 ~ 7m.
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