CN110359918A - The control method of the supporting pressure of shield machine excavation face in sand-pebble layer - Google Patents
The control method of the supporting pressure of shield machine excavation face in sand-pebble layer Download PDFInfo
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- CN110359918A CN110359918A CN201910570430.XA CN201910570430A CN110359918A CN 110359918 A CN110359918 A CN 110359918A CN 201910570430 A CN201910570430 A CN 201910570430A CN 110359918 A CN110359918 A CN 110359918A
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- China
- Prior art keywords
- excavation face
- pressure
- shield machine
- sand
- compressed air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009412 basement excavation Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000006872 improvement Effects 0.000 claims abstract description 6
- 239000013049 sediment Substances 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 239000000440 bentonite Substances 0.000 claims description 10
- 229910000278 bentonite Inorganic materials 0.000 claims description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 102000002322 Egg Proteins Human genes 0.000 claims 1
- 108010000912 Egg Proteins Proteins 0.000 claims 1
- 210000004681 ovum Anatomy 0.000 claims 1
- 239000004576 sand Substances 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 4
- 230000005641 tunneling Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- -1 quartzy sandstone Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
-
- 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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0664—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end with means for applying a coating layer to the front face, e.g. by spraying
-
- 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
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a kind of control methods of the supporting pressure of shield machine excavation face in sand-pebble layer, belong to shield machine technical field, comprising the following steps: S1: being filled with compressed air into the pressure chamber of shield machine and the pressure in pressure chamber is made to maintain to stablize；S2: by cutterhead to the spraying modified mud of excavation face；The case where control method of the supporting pressure of the excavation face is suitable in pressure chamber while having dregs and compressed air；Compressed air is filled with into pressure chamber makes the pressure in pressure chamber maintain to stablize, so that it is guaranteed that the stabilization of excavation face；To the spraying modified mud of excavation face, modified mud permeates under the action of compressed air to excavation face, to quickly form mud film in excavation face, reduces the escape of air, reaches the supporting pressure of stable excavation face；Modified mud is injected into pressure chamber, by the sediment improvement containing sandy gravel at Plastic Flow state, is convenient for the smooth deslagging of spiral dumper, is also prevented from dregs and is gushed under compressed air effect.
Description
Technical field
The invention belongs to shield machine technical fields, and in particular to the supporting pressure of shield machine excavation face in a kind of sand-pebble layer
The control method of power.
Background technique
Since the beginning of this century, China coast, riverine main cities subway construction progress into climax.Ended for the end of the year 2017,
The city that acquisition National Development and Reform Committee approves the construction of subway has had reached 43, wherein not only including a wide deep equal line city of going up north
City, there are also many two or three lines cities.In terms of operating mileage, Shanghai has become the longest city of metro operation mileage in the world
City, Beijing are number two.Since China has a vast territory, complex geologic conditions, wherein Chengdu, Lanzhou, Dalian and Beijing all encounter
Large-scale sand-pebble layer, cobble content reach 40% or more.Since the mobility of sandy gravel dregs is low, intensity is high, when
When improveing fall flat, pressure chamber and spiral dumper are easy to happen dregs and gush and hinder with stagnant troubleshooting, cause to construct
It can not normally tunnel, be forced shutdown maintenance, schedule delays and economic loss are huge；Sand-pebble layer EPB shield tunneling driving is big thus
It is all carried out using half cabin dregs and the digging mode of half cabin compressed air under partial picture, but which leads to the branch of excavation face
Shield pressure is difficult to set up, and ground cave in accident takes place frequently.
Summary of the invention
In order to solve the above problems existing in the present technology, the present invention provides shield machines in a kind of sand-pebble layer to excavate
The control method of the supporting pressure in face.
The technical scheme adopted by the invention is as follows: the control of the supporting pressure of shield machine excavation face in a kind of sand-pebble layer
Method, comprising the following steps:
S1: it is filled with compressed air into the pressure chamber of shield machine, the pressure in pressure chamber is made to maintain to stablize；
S2: by cutterhead to the spraying modified mud of excavation face.
Preferably, injecting modified mud in step S2 into pressure chamber simultaneously makes the sediment improvement containing sandy gravel at modeling
The dregs of property flow regime.
Preferably, the modified mud is bentonite slurry, and feature grain diameter d85 is greater than or equal in bentonite slurry
0.5 times of sand-pebble layer average pore size, the Su Shi funnel viscosity of bentonite slurry mud are 20~35s.
Preferably, the escape rate for being filled with rate and being greater than or equal to compressed air of the compressed air.
Preferably, the escape rate is as obtained by the analysis of Geoslope Air numerical analysis software.
Preferably, the dregs of the Plastic Flow state has the following performance: permeability < 10-4Cm/s, critical pressure of gushing
>=150kPa, slump are 150-200mm and stick resistance 100-300Pa.
The invention has the benefit that the control method of the supporting pressure of the excavation face is suitable in pressure chamber while having
The case where dregs and compressed air；Compressed air is filled with into pressure chamber makes the pressure in pressure chamber maintain to stablize, thus really
Protect the stabilization of excavation face；To the spraying modified mud of excavation face, modified mud permeates under the action of compressed air to excavation face, from
And mud film is quickly formed in excavation face, the escape of air is reduced, the supporting pressure of stable excavation face is reached；It is infused into pressure chamber
Enter modified mud, by the sediment improvement containing sandy gravel at Plastic Flow state, is convenient for the smooth deslagging of spiral dumper, is also prevented from
Dregs is gushed under compressed air effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram at the pressure chamber and excavation face of shield machine.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further elaborated.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
In description of the invention, what some structures or device were not described specifically, it is interpreted as being able to achieve in the prior art
Structure or device.
Embodiment 1
1. preparing bentonite slurry, it is desirable that feature grain diameter d85 is greater than or equal to 0.5 times of sandy gravel in bentonite slurry
Stratum average pore size, and its Su Shi funnel viscosity is 20~35s, swollen water ratio 1:4.
2. the control method of the supporting pressure of shield machine excavation face in a kind of sand-pebble layer, there is half cabin to contain in pressure chamber
The compressed air of the dregs of sandy gravel and half cabin, comprising the following steps:
S1: analyzing the escape rate of compressed air in excavation face using Geoslope Air numerical analysis software, then to
Compressed air is filled in the pressure chamber of shield machine makes the pressure in pressure chamber maintain to stablize, in which: compressed air is filled with speed
Rate is greater than or equal to the escape rate of compressed air；
S2: bentonite slurry is sprayed to excavation face by cutterhead and injection bentonite slurry to contain into pressure chamber simultaneously
There is the sediment improvement of sandy gravel at the dregs of Plastic Flow state；The dregs of Plastic Flow state has the following performance: permeability <
10-4Cm/s, the critical pressure >=150kPa that gushs, slump are 150-200mm and stick resistance 100-300Pa.
Case history
In certain orbit construction, right wire length 2274.048m, left wire length 2157.2m, smallest curve radius R600m, this
4 service channels are arranged in section, and edpth of tunnel is 9.1~29m, and penetrating ground is mainly Compact sandy-pebble stratum.Tunnel is maximum
The gradient 28 ‰, shield tunneling diameter 8.634m, section of jurisdiction internal diameter 7.5m, section of jurisdiction outer diameter 8.3m.Section is mainly passed through close in<3-8-2>
Land pebble and<3-8-3>closely knit land pebble.Upper Pleistocene series aqueoglacial deposit and alluvium (Q3fgl+ are mainly passed through in shield section
Al) land pebble.Cobble content accounts for about 60~80% in the land pebble, and partial size is mostly 4~17cm, based on sub- circle, sorting
Difference；Cobble composition is mainly medium weathering-strong weathered granite, quartzy sandstone, limestone, and compression strength is high, and self-stability is poor,
Infiltration coefficient is big, and water penetration is strong, and watery is good.
The section uses shield machine construction, repeatedly earth's surface is caused to cave in, basic reason is exactly that pressure chamber pressure can not be built
It erects and, when shield machine buried depth reaches 15-20m, pressure chamber top pressure is only 0.18-0.22MPa, it is clear that the pressure, which is lower than, to be opened
Pressure required for digging face is stablized.
For this purpose, project uses technical solution proposed by the present invention after study: preparing two air compressor machines first, produce gas velocity
Rate reaches 76m3In/h and whole charged pressure cabin, with the escape speed of Geoslope Air numerical analysis software analysis compressed air
Degree is 70-80m3/h；Mud is adjusted, swollen water is than the modification mud for 1:4, Su Shi funnel viscosity 28s.Modified mud
Injection mode be both to have injected into pressure chamber or simultaneously to being injected in a manner of spraying in front of cutterhead, Geoslope Air again
Numerical analysis software analyzes the escape velocity of compressed air, is 15-20m3/h；It is adjusted and adapted by 2 rings, pressure at the top of pressure chamber
Power is maintained at 0.26-0.28MPa, and the state after sediment improvement progressivelyes reach liquid-plastic state, slump 180-200mm, infiltration
Coefficient is 2.5-3.9 × 10-4cm/s.By above method, excavation face supporting pressure held stationary in shield machine tunneling process, spiral shell
It is smooth to revolve dumper deslagging, tunnels 12 rings of average speed/day, also avoids ground early period and cave in accident continuously emerges.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is all to fall into the claims in the present invention confining spectrum
Technical solution, be within the scope of the present invention.
Claims (6)
1. the control method of the supporting pressure of shield machine excavation face in a kind of sand-pebble layer, which is characterized in that including following step
It is rapid:
S1: it is filled with compressed air into the pressure chamber of shield machine, the pressure in pressure chamber is made to maintain to stablize；
S2: by cutterhead to the spraying modified mud of excavation face.
2. the control method of the supporting pressure of shield machine excavation face, feature in sand-pebble layer according to claim 1
It is, injects modified mud in step S2 into pressure chamber simultaneously and make the sediment improvement containing sandy gravel at Plastic Flow state
Dregs.
3. the control method of the supporting pressure of shield machine excavation face, feature in sand-pebble layer according to claim 1
It is, the modified mud is bentonite slurry, and feature grain diameter d85 is greater than or equal to 0.5 times of sand ovum in bentonite slurry
Stone stratum average pore size, the Su Shi funnel viscosity of bentonite slurry mud are 20~35s.
4. the controlling party of the supporting pressure of shield machine excavation face in sand-pebble layer according to claim 1-3
Method, which is characterized in that the escape rate for being filled with rate and being greater than or equal to compressed air of the compressed air.
5. the control method of the supporting pressure of shield machine excavation face, feature in sand-pebble layer according to claim 4
It is, obtained by the escape rate is analyzed as Geoslope Air numerical analysis software.
6. the control method of the supporting pressure of shield machine excavation face, feature in sand-pebble layer according to claim 2
It is, the dregs of the Plastic Flow state has the following performance:
Permeability < 10-4Cm/s, the critical pressure >=150kPa that gushs, slump are 150-200mm and stick resistance 100-
300Pa。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910570430.XA CN110359918A (en) | 2019-06-27 | 2019-06-27 | The control method of the supporting pressure of shield machine excavation face in sand-pebble layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910570430.XA CN110359918A (en) | 2019-06-27 | 2019-06-27 | The control method of the supporting pressure of shield machine excavation face in sand-pebble layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110359918A true CN110359918A (en) | 2019-10-22 |
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| CN201910570430.XA Pending CN110359918A (en) | 2019-06-27 | 2019-06-27 | The control method of the supporting pressure of shield machine excavation face in sand-pebble layer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2676500B1 (en) * | 1991-05-16 | 1995-09-08 | Bessac Creusement Soutenement | METHOD AND SHIELDING MACHINE FOR THE EXCAVATION OF UNDERGROUND GALLERIES, ESPECIALLY IN LOW COHESION AQUIFERATED SOILS. |
| CN103244135A (en) * | 2013-04-26 | 2013-08-14 | 广东华隧建设股份有限公司 | Construction method for manufacturing mud film in high-permeability stratum |
| CN103603670A (en) * | 2013-11-21 | 2014-02-26 | 上海市基础工程集团有限公司 | Construction method of ultra-deep-earthed shield crossing complex formations |
| CN104131817A (en) * | 2014-07-04 | 2014-11-05 | 西南交通大学 | Muck improvement process for shield tunneling construction of rich water sandy gravel stratum |
| CN105003273A (en) * | 2015-07-29 | 2015-10-28 | 中铁工程装备集团有限公司 | Combined cutterhead adaptive to sand-pebble strata |
| CN105971614A (en) * | 2016-06-17 | 2016-09-28 | 上海隧道工程有限公司 | Shield tunneling machine and shield construction method applied to composite stratum with upper soft portion and lower hard portion |
| CN108086987A (en) * | 2018-01-11 | 2018-05-29 | 河海大学 | Control method for keeping excavation face stable in earth pressure shield excavation in upper soft and lower hard strata |
-
2019
- 2019-06-27 CN CN201910570430.XA patent/CN110359918A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2676500B1 (en) * | 1991-05-16 | 1995-09-08 | Bessac Creusement Soutenement | METHOD AND SHIELDING MACHINE FOR THE EXCAVATION OF UNDERGROUND GALLERIES, ESPECIALLY IN LOW COHESION AQUIFERATED SOILS. |
| CN103244135A (en) * | 2013-04-26 | 2013-08-14 | 广东华隧建设股份有限公司 | Construction method for manufacturing mud film in high-permeability stratum |
| CN103603670A (en) * | 2013-11-21 | 2014-02-26 | 上海市基础工程集团有限公司 | Construction method of ultra-deep-earthed shield crossing complex formations |
| CN104131817A (en) * | 2014-07-04 | 2014-11-05 | 西南交通大学 | Muck improvement process for shield tunneling construction of rich water sandy gravel stratum |
| CN105003273A (en) * | 2015-07-29 | 2015-10-28 | 中铁工程装备集团有限公司 | Combined cutterhead adaptive to sand-pebble strata |
| CN105971614A (en) * | 2016-06-17 | 2016-09-28 | 上海隧道工程有限公司 | Shield tunneling machine and shield construction method applied to composite stratum with upper soft portion and lower hard portion |
| CN108086987A (en) * | 2018-01-11 | 2018-05-29 | 河海大学 | Control method for keeping excavation face stable in earth pressure shield excavation in upper soft and lower hard strata |
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Application publication date: 20191022 |
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