CN110130936A - It dashes forward in a kind of shield tunneling process and meets the construction method of untreated solution cavity or crack - Google Patents
It dashes forward in a kind of shield tunneling process and meets the construction method of untreated solution cavity or crack Download PDFInfo
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- CN110130936A CN110130936A CN201910489570.4A CN201910489570A CN110130936A CN 110130936 A CN110130936 A CN 110130936A CN 201910489570 A CN201910489570 A CN 201910489570A CN 110130936 A CN110130936 A CN 110130936A
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- shield
- slip casting
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- 238000010276 construction Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 23
- 230000005641 tunneling Effects 0.000 title claims abstract description 22
- 239000000243 solution Substances 0.000 claims abstract description 90
- 238000007569 slipcasting Methods 0.000 claims abstract description 33
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 229920002635 polyurethane Polymers 0.000 claims abstract description 27
- 239000004814 polyurethane Substances 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 7
- 230000006837 decompression Effects 0.000 claims abstract description 6
- 238000004062 sedimentation Methods 0.000 claims abstract description 6
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- 239000002689 soil Substances 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000005553 drilling Methods 0.000 claims description 23
- 238000011161 development Methods 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- 210000004911 serous fluid Anatomy 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 231100000241 scar Toxicity 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 238000007596 consolidation process Methods 0.000 abstract description 4
- 230000003750 conditioning effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009963 fulling Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 poly- ammonia Ester Chemical class 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
- E21D11/105—Transport 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
-
- 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention, which provides to dash forward in a kind of shield tunneling process, meets the construction method of untreated solution cavity.The construction method is in shield tunneling process, when support pressure declines or the amount of being unearthed reduces, the thick mud of Xiang Tucang injection allotment, it is carried out in tunneling process using the section of jurisdiction with reserved injected hole immediately assembled normal to shield Parameter reconstruction, after the completion of assembly, slip casting hole location bore detecting solution cavity or crack position are reserved by section of jurisdiction in Tu Cang decompression area, and in the hole location installation non-return valve injection polyurethane slurries being connected to solution cavity or crack, slip casting carries out reaming to slip casting position after completing, embedded sleeve valve steel pipe, injects cement slurry for leak position；Meanwhile being monitored for native storehouse decompression position ground, WSS grouting and reinforcing is used for sedimentation large area.The present invention blocks solution cavity crack using thick mud conditioning solution cavity, again by injection polyurethane, cement slurry, tie surface WSS slip casting stratum consolidation, effective solution shield prominent the problem of meeting untreated solution cavity.
Description
Technical field
The invention belongs to city track traffic engineering fields, particularly directed to shield when encountering untreated solution cavity or crack
A kind of construction method, with guarantee shield can normally pass through solution cavity development area, it is ensured that shield-tunneling construction safety.
Background technique
As the infrastructure construction in China enters the white-hot stage, Construction of Urban Rail Traffic is also followed by capital construction
Tide is able to sustained and rapid development, and shield-tunneling construction also plays an increasingly important role during subway construction.In China
The area such as southern Yunnan, Guangxi, Guangdong, Guizhou, Sichuan is affected by karst, and it is molten shield crossing inevitably occur
Hole development area, and karst brings pole to the construction of shield tunnel as complicated and can form the unfavorable geologies of high risks
Big risk.The development of solution cavity not only seriously jeopardizes the stabilization of structure, but also is easy to happen " gushing ", " shield in the construction process
Structure plants head ", therefore, it is necessary to be handled.Encryption, which is mended, before existing processing technique is generally constructed by tunneling shield surveys, and discloses
Then solution cavity position carries out injecting treatment.But in solution cavity developmentally band, often there are some solution cavities or crack cannot be sent out
Existing, this phenomenon can bring serious harm to shield-tunneling construction again.
At this stage, Shield Construction Technique not yet full maturity is still deposited for the shield construction method in molten soil cave development location
In larger blank.Since shield Tu Cang will guarantee to balance with soil pressure, shield is in construction, if encountering untreated molten
Hole or crack can be such that support pressure reduces, or even cause surface collapse, seriously jeopardize the safety in tunneling process.Therefore, it grinds
Study carefully a kind of shield it is prominent meet untreated solution cavity when solution, have very important meaning to present subway work.
Summary of the invention
The present invention, which provides to dash forward in a kind of shield tunneling process in view of the deficiencies of the prior art, meets untreated solution cavity or crack
Construction method, the processing method are the high concentration slurry processing solution cavity or crack using special proportion preparation, then special by injection
Polyurethane slurries, the pre-buried steel sleeve valve barrel grouting very matched blocks solution cavity crack, and tie surface WSS construction carries out stratum consolidation,
It can solve shield prominent the problem of meeting untreated solution cavity, and guarantee the Forming Quality in tunnel and the safety and stability of above ground structure,
Reduce the risk that shield passes through solution cavity developmentally band.
In order to practice above-mentioned construction method, technical solution provided by the invention are as follows: dash forward in a kind of shield tunneling process
Meet the construction method in untreated solution cavity or crack, it is characterised in that specifically includes the following steps:
(1) 6~12 screw thread injected holes are reserved in every endless tube on piece, and are added in the prefabricated section of jurisdiction for solution cavity development location
Strong reinforcement of segment；
(2) before shield begins to pass molten soil cave development stratum, existed using weighing apparatus shield mud and bentonite allotment specific gravity control
1.30~1.35g/cm3, thick mud of the viscosity control in 35~40s；
(3) guarantee that shield is normally tunneled in molten soil cave development location, and monitor the unearthed situation of shield support pressure, soil outlet
And surface subsidence, support pressure are 0.2bar bigger than soil pressure at the top of cutterhead, when shield support pressure plunges or earth volume is bright out
It is aobvious to reduce, it can determine whether prominent chance solution cavity or lava crack, should stop tunneling immediately；
(4) after stopping driving, pass through the thick mud of allotment in gate valve Xiang Tucang injection step (2) on shield soil bulkhead immediately
Slurry guarantees that Tu Cang maintains normal soil pressure, and shield continues to tunnel later, and assembled using section of jurisdiction progress prefabricated in step (1), directly
After restoring normal and other situations without exception to shield support pressure, shield continues to apply using conventional section of jurisdiction according to conventional driving
Work；
(5) it after native storehouse decompression region prefabricated pipe section assembly is completed in step (4), for the section of jurisdiction in the region, uses
Water drilling is being drilled by reserving screw thread injected hole bore detecting solution cavity or lava crack position to outside section of jurisdiction on prefabricated pipe section
It is such as without exception in the process, then judge that the position without solution cavity or crack, carries out closure processing for drilling；In boring procedure in case of
Water burst situation judges that there are solution cavity or crack in the position, installs non-return valve in hole location immediately, prepares slip casting；
(6) simultaneously, 2~3 water level holes are laid in the corresponding ground areas in native storehouse decompression position, and encrypt laying sedimentation
Monitoring point；
(7) it is carried out at slip casting by all drilling positions being connected to solution cavity or crack of water burst situation judgement in step (5)
Reason, grouting serous fluid are the polyurethane injection slurry of aqueous polyurethane and oiliness polyurethane according to the quality of 2:1 than mixed preparing, note
Pressure control is starched within 0.4MPa；
(8) 6~8 hours are stood after the completion of polyurethane slip casting in step (7), with solution cavity or is split using water drilling for all
The slip casting hole location bore expanded hole of gap connection, and embedded sleeve valve steel pipe；Such as embedded sleeve valve steel pipe still has drainage, continues to inject water
For the double slurries of mud-waterglass to no drainage, grouting pressure is 0.4~0.6MPa, and filling pressure eventually is 1MPa；
(9) by water level hole and settlement monitoring point pre-buried in step (6) to Ground Subsidence Monitoring, in sedimentation large area
Grouting and reinforcing is carried out to more than scar 1.5~3m soil layer using WSS bored grouting machine, later period solution cavity crack is avoided to develop again,
Cause tunnel and ground security risk.
The present invention preferably technical solution: the multiple screw thread injected holes reserved on prefabricated pipe section in the step (1) are equidistant
The diameter of distribution, each screw thread injected hole is 40~70mm, and prepares matched slip casting port lid.
The present invention preferably technical solution: the thick mud in the step (2) is specifically to be formed by following material allocation:
The present invention preferably technical solution: in the thrust control of molten soil cave development location shield driving in the step (3)
In 500~720T, driving speed is 40~50mm/min, and cutter head torque is 500~700MNm, and cutterhead revolving speed is 1.0~1.5r/
min。
The present invention preferably technical solution: the drilling depth of detection solution cavity or lava crack in the step (5) is pipe
Outer 1.5~the 3m of piece, aperture are 25~35mm.
The present invention preferably technical solution: its slurries total weight is added in the polyurethane injection slurry in the step (7)
10%~12.5% diesel oil；When grouting pressure increases suddenly, slip casting injection rate is reduced suddenly during slip casting, can determine that molten
The processing of hole crack is completed.
The present invention preferably technical solution: using water drilling bore expanded hole diameter for 50mm in the step (8), valve steel pipe of tucking inside the sleeve
Diameter is 42mm~48mm, and the pre-buried length of sleeve valve steel pipe is 2~3m；The double slurries of its cement-sodium silicate use common 42.5 silicon
Acid salt cement is formed according to the ratio of mud mixing of 1.5:1, then with Baume degrees be 36~40 waterglass according to 1:1 volume
Than being injected using slip casting machine, after slurries injection is completed, sleeve valve steel pipe is rinsed, the operation of later period tunnel can be used to track note
Slurry processing.
The present invention preferably technical solution: WSS bored grouting is to pour into thick mud in step (4) in the step (9)
After slurry and step (7) injection polyurethane, then by surface drilling progress WSS slip casting, grouting serous fluid is using ratio of mud 1.5:1's
Cement slurry, during slip casting the grouting pressure of incipient stage be 0, continue 2.5h after, terminate grouting pressure be 0.6~
1.0MPa, and during slip casting, tunnel internal monitoring is carried out, prevents section of jurisdiction from deforming.
Beneficial effects of the present invention:
(1) bentonitic content in simulated mud is improved in the present invention, and a small amount of weighing apparatus shield mud is added, and weighing apparatus shield mud is a kind of
It using inorganic clay as main material, reacts to form a kind of highly viscous thixotropic slurry with tackifier by modified, have good
Workability and adhesiveness, this way makes mud be not easy to be diluted in water to take away, improves the specific gravity and viscosity of mud, improves
The performance of mud makes mud be more suitable for solution cavity filling.
It (2), being capable of accurate judgement shield crossing molten soil cave development stratum according to the pressure change of shield Tu Cang in the present invention
Solution cavity or crack whether are encountered in the process, reduce shield in the construction risk for passing through molten soil cave stratum.
(3) it selects to be filled solution cavity with thick mud in the present invention, optimizes construction process, it is prominent to shorten processing
The time for the untreated solution cavity met, for shield, in molten soil cave, developmentally belt construction provides excellent technical guarantee, reduces shield
Structure solution cavity development region driving risk, in addition, mud is to being subsequently implanted into polyurethane and cement slurry plays and excludes sundries
Effect reduces the difficulty of subsequent construction, provides convenience for subsequent construction.
(4) by installing non-return valve on section of jurisdiction as the standard for judging solution cavity pre-processing effect, if inverse in the present invention
Only valve has water to gush out, then demonstrates the need for carrying out subsequent processing, provide the basis of accurate judgement for subsequent construction.
(5) by injection aqueous polyurethane and oiliness polyurethane and the mixed liquor that a small amount of diesel oil is added in the present invention, to fill out
Solution cavity is filled, two kinds of polyurethane are adequately utilized can expand rapidly after encountering water, and foaming consolidates integral characteristic, energy
Achieve the effect that further to fill solution cavity, and sealing purpose can be reached.In addition, thick mud has filled solution cavity and then injection
Polyurethane keeps polyurethane consolidation integral, to block the crack connecting in stratum with solution cavity, prevents the mud injected originally
Gush out, makes the better effect for filling solution cavity.
(6) it drills in tunnel in the present invention, pre-buried steel mini-valve tube can be by pre- if later period discovery tunnel leaks
The mini-valve tube buried carries out slip casting, further fills solution cavity, keeps the stabilization of geological conditions around tunnel, and this method can not only reach
The effect and purpose of leak stopping, and to repair tunnel during later period operation, guarantee that tunnel quality provides convenience；If the later period transports
During battalion, discovery tunnel is leaked, or even sedimentation is excessive, can be handled by pre-buried steel mini-valve tube, guarantees
The safety of tunnel internal driving.
(7) present invention is corresponding to solution cavity or crack after pouring into thick mud, injecting polyurethane, then through surface drilling
Ground location carries out WSS slip casting, prevents solution cavity crack from developing again, can not only reach the mesh for being further ensured that tunnel quality
, moreover it is possible to the safety for guaranteeing the localized ground structures prevents surface collapse, reduces the threat to ground structures.
Construction technology of the present invention is simple, and construction globality is stronger.Using thick mud conditioning solution cavity, again by injecting poly- ammonia
Ester, pre-buried steel sleeve valve barrel grouting blocking solution cavity crack or channel, tie surface WSS construction carry out stratum consolidation, effective solution
Shield prominent the problem of meeting untreated solution cavity, guarantees the Forming Quality in tunnel and the safety and stability of above ground structure, effectively drop
Low shield passes through the risk of solution cavity developmentally band.
Detailed description of the invention
Fig. 1 is that prefabricated pipe section reserves injected hole expanded view in the present invention；
Fig. 2, which is that shield driving is prominent in the present invention, meets solution cavity schematic diagram.
In figure: 1-shield tunnel, 2-solution cavities, 3-solution cavity cracks, 4-rock stratum, 5-WSS slip casting fill areas, 6-layers of sand
And miscellaneous fill, 7-prefabricated pipe sections, 8-steel mini-valve tubes, 9-exploration holes, the reserved screw thread injected hole of 10-prefabricated pipe sections,
11-holes for hoist.
Specific embodiment
Below with reference to embodiment, the present invention is further described.
Embodiment is for Guangzhou Underground shield section, which uses shield construction, the left wire length in section
1098.87m, the right wire length 1099.188m in section, the earthing buried depth of running tunnel vault is about 7.5m~13.8m, and route buried depth is about
For 13.5~19.8m.It is mainly Delta of the Pearl River alluvial-proluvial plain landforms along the section, landform is relatively flat, ground elevation
About 6.0~10.0m, the 4th is alluvial deposit, layer of sand development.There are<3-1>Extra-fine sand,<3-2>in the stratum that the section is mainly passed through
Medium coarse sand,<3-3>gravelly sand,<4N-1>silty clay (stream modeling~soft modeling),<4N-2>silty clay (plastic),<4-2B>Muddy Bottoms
Soil,<5C-1A>limestone residual soil native (soft modeling), the micro- weathered stratum of<9C-2>limestone and soil cave, solution cavity.It is applied early period in shield-tunneling construction
During work, encryption, which is mended, surveys the hole 5m/, and discovery is shown in hole rate up to 22%；The molten soil cave hole height disclosed is up to 14.5m, is distributed
Below tunnel.Specific aim measure is taken into solution cavity position and tunnel relation statistic of classification；To the molten soil cave injecting treatment of announcement；It is molten
It is detected after soil cave processing, it is ensured that processing quality；But since solution cavity is developed, untreated solution cavity is still encountered in tunneling process
Or crack.
For untreated solution cavity or crack is still encountered in the project under construction tunneling process, using the construction in the present invention
Method is constructed, specifically includes the following steps:
(1) it is mended according to section and surveys discovery, it is 330m or so which, which passes through molten soil cave development zone length, therefore early period counts
Draw prefabricated 220 ring of section of jurisdiction for increasing screw thread injected hole；Slip casting bore dia is 50mm, and every endless tube on piece increases by 8 screw thread injected holes,
Eight screw thread injected holes are equally distributed on the section of jurisdiction A1, A2, A3, B, C in tunnel, are added original hole for hoist, are shared 12
Reserved slip casting hole location, distribution are corresponding in different points；
(2) before passing through solution cavity development stratum, thick mud is prepared.According to current stratum characteristic, mud viscosity is determined
It controls in 35~40s, specific gravity control is in 1.30~1.35g/cm3.By test of many times, determine to improve swelling in simulated mud
The content of soil, and a small amount of weighing apparatus shield mud is added, increase the viscosity of mud, mud is made to be not easy to be diluted in water to take away, improves mud
The specific gravity and viscosity of slurry make mud be more suitable for solution cavity filling.The specific proportion of thick mud see the table below:
(3) in passing through molten soil cave development stratum, the thrust that shield machine normally tunnels is 550~720T, and driving speed is
30~40mm/min, cutter head torque are generally 550~700MNm, and cutterhead revolving speed is 1.0~1.5r/min, and muddy water storehouse pressure is
1.4~1.5bar.It spells in shield pick to 527 rings, when cutterhead is located at 533 ring, support pressure is reduced to 0.8bar, and soil suddenly
Storehouse pressure is still on a declining curve, to guarantee support pressure, slowly reduces driving speed, into shutdown state of pressure keeping.
(4) mud is allowed to fill out by thick mud prefabricated in gate valve Xiang Tucang injection step (2) on shield soil bulkhead immediately
The solution cavity encountered or lava crack are filled, guarantees that Tu Cang maintains normal soil pressure；After support pressure rises to normal condition, shield is extensive
Multiple driving, and assembly is carried out using special section of jurisdiction prefabricated in step (1).
(5) after the completion of the pick of 533 ring of tunnel is spelled, using water drilling by the reserved injected holes of 532 to 534 endless tube piece points to
Drill 2~3m, aperture 30mm outside section of jurisdiction, by bore detecting in 532 rings, 2 points of 533 endless tube pieces, the drilling of 10 points
There is water burst phenomenon, the drilling of remaining point is normal, therefore installs non-return valve in the drilling of water burst immediately, and completes remaining just
The borehole sealing of normal point.
(6) project management department takes timely measure, and 3 water level holes, monitoring ground are arranged on 532 rings to the ground of 534 ring positions
It is lauched wastage, and encrypts the control of ground settlement point, 2h carries out a ground monitoring.
(7) observation discovery non-return valve water burst is serious, and water burst pressure is larger, and has mud to gush out, and to guarantee tunnel quality, opens
Begin to inject polyurethane mixed liquor by check valve position.Polyurethane mixed liquor is by aqueous polyurethane and oiliness polyurethane according to 2:1
Ratio mix, and the diesel oil of mixed liquor gross mass 10% is added, is injected using hydraulic double-liquid grouting pump, pressure control
System is within 0.4Mpa.It injects after 1h, discovery non-return valve pours in water pressure reduction, persistently injects 2h, and discovery has a large amount of foaming
Particle is flowed out from non-return valve, stops injection polyurethane.
(8) the expanding drilling of water drilling is used in, the drilling of 10 points at 2 points of 532 rings and 533 endless tube pieces, it is expanding to 50mm, weight
Newly be drilled into bottom hole, the sleeve valve steel pipe that installation diameter is 42mm~48mm, as shown in Fig. 2, the pre-buried length of sleeve valve steel pipe be 2~
3m；Later period discovery is as having drainage at sleeve valve steel pipe, to guarantee tunnel quality, starts slip casting by reserved steel mini-valve tube,
Slurry material uses common 42.5 portland cement, forms according to the ratio of mud mixing of 1.5:1, is then 36~40 with Baume degrees
Waterglass according to 1:1 volume ratio inject, grouting pressure be 0.4~0.6MPa, eventually fill pressure be 1MPa, each Duan Junda of deep hole
To design final pressure, and stablize 10 minutes, after slip casting, clean steel mini-valve tube, the operation of later period tunnel can be used to tracking grouting
Processing.
(9) since the overlying regions are the main line of communication, traffic is more, to guarantee ground traffic safety, in the region
Carry out WSS grouting and reinforcing.Since 533 ring position buried depth of tunnel is 12.3m, scar depth is 10.5m-10.7m, therefore, WSS note
Starch bar bottom far from ground 10.5m locate, using cement slurry progress grouting and reinforcing, ratio of mud 1.5:1.Incipient stage, grouting pressure
Almost 0, after continuing 2.5h, terminates grouting pressure and reach 0.8MPa.During slip casting, personnel is arranged to carry out tunnel internal prison
It surveys, prevents section of jurisdiction from deforming.Grouting pressure is controlled, drilling rod is slowly promoted, guarantees that ground monitoring is no different with tunnel internal monitoring
Often.
It uses to dash forward in the shield tunneling process in the present invention in above-mentioned project under construction and meets the construction method of untreated solution cavity
Afterwards, it helps shield smoothly to pass through solution cavity developmentally band, ensure that the quality in molding tunnel, provided and tried hard to keep for tunnel holing through
Barrier.
The above, only one embodiment of the present of invention, the description thereof is more specific and detailed, but can not therefore manage
Solution is limitation of the scope of the invention.It should be pointed out that for those of ordinary skill in the art, not departing from this hair
Under the premise of bright design, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.Therefore, this hair
It is bright that the scope of protection shall be subject to the appended claims.
Claims (8)
1. dashing forward in a kind of shield tunneling process meets the construction method of untreated solution cavity or crack, it is characterised in that specifically include following
Step:
(1) 6~12 screw thread injected holes, and reinforced pipe are reserved in every endless tube on piece in the prefabricated section of jurisdiction for solution cavity development location
Piece arrangement of reinforcement；
(2) before shield begins to pass molten soil cave development stratum, using weighing apparatus shield mud and bentonite allotment specific gravity control 1.30~
1.35g/cm3, thick mud of the viscosity control in 35~40s；
(3) guarantee that shield is normally tunneled in molten soil cave development location, and monitor the unearthed situation of shield support pressure, soil outlet and ground
Face sedimentation, support pressure are 0.2bar bigger than soil pressure at the top of cutterhead, when shield support pressure plunges or earth volume obviously subtracts out
It is few, it can determine whether prominent chance solution cavity or lava crack, should stop tunneling immediately；
(4) after stopping driving, pass through the thick mud deployed in gate valve Xiang Tucang injection step (2) on shield soil bulkhead immediately,
Guaranteeing that Tu Cang maintains normal soil pressure, shield continues to tunnel later, and carries out assembly using section of jurisdiction prefabricated in step (1), until
After shield support pressure restores normal and other situations without exception, shield continues to construct using conventional section of jurisdiction according to conventional driving；
(5) after native storehouse decompression region prefabricated pipe section assembly is completed in step (4), for the section of jurisdiction in the region, using water drilling
By reserving screw thread injected hole bore detecting solution cavity or lava crack position to outside section of jurisdiction on prefabricated pipe section, in boring procedure
In as without exception, then judge that the position without solution cavity or crack, carries out closure processing for drilling；Such as water burst in boring procedure
Situation judges that there are solution cavity or crack in the position, installs non-return valve in hole location immediately, prepares slip casting；
(6) simultaneously, 2~3 water level holes are laid in the corresponding ground areas in native storehouse decompression position, and encrypt laying settlement monitoring
Point；
(7) injecting treatment is carried out by all drilling positions being connected to solution cavity or crack of water burst situation judgement in step (5),
Grouting serous fluid is the polyurethane injection slurry of aqueous polyurethane and oiliness polyurethane according to the quality of 2:1 than mixed preparing, slip casting pressure
Power controls within 0.4MPa；
(8) 6~8 hours are stood after the completion of polyurethane slip casting in step (7), is connected for all with solution cavity or crack using water drilling
Logical slip casting hole location bore expanded hole, and embedded sleeve valve steel pipe；Such as embedded sleeve valve steel pipe still has drainage, continues to inject cement-
For the double slurries of waterglass to no drainage, grouting pressure is 0.4~0.6MPa, and filling pressure eventually is 1MPa；
(9) Ground Subsidence Monitoring is used in sedimentation large area by water level hole and settlement monitoring point pre-buried in step (6)
WSS bored grouting machine carries out grouting and reinforcing to more than scar 1.5~3m soil layer, avoids later period solution cavity crack from developing again, causes
Tunnel and ground security risk.
2. dashing forward in a kind of shield tunneling process according to claim 1 meets the construction method of untreated solution cavity or crack,
Be characterized in that: multiple reserved screw thread injected holes of prefabricated pipe section are equally spaced in the step (1), each screw thread injected hole it is straight
Diameter is 40~70mm, and prepares matched slip casting port lid.
3. dashing forward in a kind of shield tunneling process according to claim 1 meets the construction method of untreated solution cavity or crack,
Be characterized in that: the thick mud in the step (2) is specifically to be formed by following material allocation:
。
4. dashing forward in a kind of shield tunneling process according to claim 1 meets the construction method of untreated solution cavity or crack,
It is characterized in that: being controlled in the thrust of molten soil cave development location shield driving in 500~720T, driving speed in the step (3)
For 40~50mm/min, cutter head torque is 500~700MNm, and cutterhead revolving speed is 1.0~1.5r/min.
5. dashing forward in a kind of shield tunneling process according to claim 1 meets the construction method of untreated solution cavity or crack,
Be characterized in that: the drilling depth of detection solution cavity or lava crack in the step (5) is 1.5~3m outside section of jurisdiction, aperture 25
~35mm.
6. dashing forward in a kind of shield tunneling process according to claim 1 meets the construction method of untreated solution cavity or crack,
It is characterized in that: the diesel oil of its slurries total weight 10%~12.5% being added in the polyurethane injection slurry in the step (7)；It is infusing
When grouting pressure increases suddenly, slip casting injection rate is reduced suddenly during slurry, the processing completion of solution cavity crack can determine that.
7. dashing forward in a kind of shield tunneling process according to claim 1 meets the construction method of untreated solution cavity or crack,
It is characterized in that: using water drilling bore expanded hole diameter for 50mm in the step (8), sleeve valve diameter of steel tube is 42mm~48mm, sleeve
The pre-buried length of valve steel pipe is 2~3m；The double slurries of its cement-sodium silicate use common 42.5 portland cement, according to 1.5:1's
Ratio of mud mixing forms, and the waterglass for being then 36~40 with Baume degrees is injected according to the volume ratio of 1:1 using slip casting machine, slurries
After injection is completed, sleeve valve steel pipe is rinsed, the operation of later period tunnel can be used to tracking grouting processing.
8. dashing forward in a kind of shield tunneling process according to claim 1 meets the construction method of untreated solution cavity or crack,
Be characterized in that: WSS bored grouting is that thick mud and step (7) injection polyurethane are poured into step (4) in the step (9)
Afterwards, then by surface drilling WSS slip casting is carried out, grouting serous fluid uses the cement slurry of ratio of mud 1.5:1, opens during slip casting
The grouting pressure in stage beginning is 0, and after continuing 2.5h, termination grouting pressure is 0.6~1.0MPa, and during slip casting, is carried out
Tunnel internal monitoring, prevents section of jurisdiction from deforming.
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