CN104806252B - Underground dome excavation construction arrangement and excavation method - Google Patents
Underground dome excavation construction arrangement and excavation method Download PDFInfo
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- CN104806252B CN104806252B CN201510206255.8A CN201510206255A CN104806252B CN 104806252 B CN104806252 B CN 104806252B CN 201510206255 A CN201510206255 A CN 201510206255A CN 104806252 B CN104806252 B CN 104806252B
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Abstract
The present invention relates to underground engineering technical field is and in particular to underground dome excavation construction arrangement and excavation method.This Construction Arrangement structure includes：Centre strut and construction passage；Construction passage extends to centre strut from outside the dome of underground；Centre strut is the step-like column construction successively decreasing from bottom to top；The excavation that the side of centre strut arranges III annular base tunnel from bottom to top uncovers face, and the excavation of I 3 annular base tunnels uncovers face, and the excavation of I 1 annular base tunnels uncover face, the excavation of II annular base tunnel of face, the excavation of I 2 annular base tunnels that uncover uncovers face；In centre strut, setting " ten " font excavates the face that uncovers.First reserve centre strut in excavation, then excavate dome annular base tunnel country rock, then central excavation pillar.This Construction Arrangement and excavation method can reduce temporary support, save construction costs, improve the safety of the stability of country rock and construction in dome digging process simultaneously.
Description
Technical field
The present invention relates to underground engineering technical field is and in particular to underground dome excavation construction arrangement and excavation side
Method.
Background technology
At present, the digging construction method in tunnel is more, including full section method, benching tunnelling method, two side-wall pilot tunnel, median septum method etc.,
Technical comparing is ripe, disclosure satisfy that the tunnel excavation of different section size under the conditions of different surrounding rock.And for large-scale underground vault
Roof construction, because moulding is special, force-bearing of surrounding rock mass state is also complex, there is presently no the excavation method of maturation, needs to increase
Excessive temporary support.
Content of the invention
Embodiments of the invention provide a kind of underground dome excavation construction arrangement and excavation method, can solve the problem that tradition
Excavation method difficulty or ease adapt to the construction of Large Span Underground dome, and excessive temporary support increases the problem excavating cost.
A kind of underground dome excavation construction arrangement is provided according to an aspect of the present invention, including：Centre strut and
Construction passage；Described construction passage extends to described centre strut from outside the dome of underground；Described centre strut is to pass from bottom to top
The step-like column construction subtracting；The excavation that the side of described centre strut arranges III annular base tunnel from bottom to top uncovers face, I 3 rings
The excavation of shape base tunnel uncovers face, and uncover face, the excavation of I 2 annular base tunnels of the excavation of I 1 annular base tunnels uncovers face, II annular base tunnel
Excavation uncovers face；In described centre strut, setting " ten " font excavates the face that uncovers.
In certain embodiments, preferably, described I 1 annular base tunnels than described I 2 annular base tunnels advanced 3-5 rice, described I 2
Annular base tunnel advanced 3-5 rice than described I 3 annular base tunnels.
In certain embodiments, preferably, described I 1 annular base tunnels, I 2 annular base tunnels, I 3 annular base tunnels, described II
Annular base tunnel, the described III annular face of base tunnel, the face at described centre strut top be sprayed with successively from inside to outside concrete layer,
Steel fiber reinforced concrete layer；Described steel fiber reinforced concrete layer hangs bar-mat reinforcement, and described concrete layer anchors the first hollow bolt, in second
Spare anchor bar；The length of described first anchor pole is more than the length of described second anchor pole, and described first anchor pole and described second anchor pole are handed over
For arrangement.
In certain embodiments, preferably, described underground dome excavation construction arrangement also includes the first prestressing force
Anchor cable is arranged, and described first prestress anchorage cable is arranged as circulus, is surrounded by multiple the first uniformly alternate prestress anchorage cables, each
One end of described first prestress anchorage cable is anchored in the face of described I 3 annular base tunnels；Two neighboring first prestressed anchor grommet
It is setting value to spacing.
In certain embodiments, preferably, described underground dome excavation construction arrangement also includes the second prestressing force
Anchor cable is arranged, and described second prestress anchorage cable is arranged as circulus, is surrounded by multiple the second uniformly alternate prestress anchorage cables, each
One end of described second prestress anchorage cable is anchored in the face of described III annular base tunnel；Two neighboring second prestressed anchor grommet
It is setting value to spacing.
Present invention also offers a kind of dome excavation method of underground, it includes：
Step 1, reserved centre strut supports annular base tunnel country rock on dome；
Step 2, excavates dome annular base tunnel country rock, and carries out support reinforcement；Described dome annular base tunnel includes：From lower and
On III annular base tunnel, I 3 annular base tunnels, I 1 annular base tunnels, I 2 annular base tunnels, II annular base tunnel；
Step 3, excavates annular base tunnel core column in center " ten " cabinet frame of described centre strut, carries out support reinforcement；
Step 4, excavates described centre strut remaining annular base tunnel, carries out support reinforcement.
In certain embodiments, preferably, described step 2 includes：
Step 21, benching tunnelling method excavates I 1 annular base tunnels, I 2 annular base tunnels, I 3 annular base tunnels, carries out support reinforcement, and wherein I 1
Annular base tunnel is between I 2 annular base tunnels and I 3 annular base tunnels；
Step 22, excavates II annular base tunnel above I 2 annular base tunnels, carries out support reinforcement；
Step 23, excavates III annular base tunnel below I 3 annular base tunnels, carries out support reinforcement.
In certain embodiments, preferably, described step 21 includes：
I 1 annular base tunnels, I 2 annular base tunnels, I 3 annular base tunnels are excavated successively using benching tunnelling method, described I 1 annular base tunnels compare institute
State I 2 annular base tunnel advanced 3-5 rice, described I 2 annular base tunnels advanced 3-5 rice than described I 3 annular base tunnels；
Just stir cement and soft soil in deep ground, then hangs bar-mat reinforcement；
Pneumatically placed concrete again, annular anchoring the first hollow bolt, the second hollow bolt, the length of described first anchor pole is more than institute
State the length of the second anchor pole, described first anchor pole and described second anchor pole are alternately arranged；
Annular anchors multiple first prestress anchorage cables.
In certain embodiments, preferably, described step 3 includes：
In described centre strut " ten " font to wearing in excavation annular base tunnel core column；
Just stir cement and soft soil in deep ground, then hangs bar-mat reinforcement；
Pneumatically placed concrete again, annular anchoring the first hollow bolt, the second hollow bolt, the length of described first anchor pole is more than institute
State the length of the second anchor pole, described first anchor pole and described second anchor pole are alternately arranged；
Annular anchors multiple second prestress anchorage cables.
In certain embodiments, preferably, after described step 4, the dome excavation method of described underground also includes：
Remove gib；
Benching tunnelling method excavates remaining rock mass successively, builds tunnel floor and paving.
The underground dome excavation construction arrangement being provided by embodiments of the invention and excavation method, with prior art
Compare, using reserved centre strut region, dome country rock is supported with the core column reserved to dome central authorities, improves stablizing of country rock
Property；Neutral pillar is reduce successively from top to bottom step-like, carries out annular excavation with guide pit, carry out supporting in digging process and add
Gu, last central excavation pillar, and progressively carry out support reinforcement.This Construction Arrangement and excavation method can reduce interim
Support, saves construction costs, improves the safety of the stability of country rock and construction in dome digging process simultaneously.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing having required use in technology description is described it is clear that combining the technical scheme that accompanying drawing is described being only
Some embodiments of the present invention, for those of ordinary skills, on the premise of not paying creative work, also may be used
To obtain other embodiments and its accompanying drawing according to these accompanying drawing illustrated embodiments.
Fig. 1 is underground dome excavation construction arrangement generalized section in one embodiment of the invention；
Fig. 2 is underground dome excavation construction arrangement floor map in Fig. 1 of the present invention；
Fig. 3 is to excavate I 1 annular base tunnels, I 2 annular base tunnels, the excavation structure of I 3 annular base tunnels in one embodiment of the invention
Generalized section；
Fig. 4 is Fig. 3 of the present invention corresponding excavation plane graph；
Fig. 5 is the excavation structural profile schematic diagram excavating II annular base tunnel in one embodiment of the invention；
Fig. 6 is Fig. 4 of the present invention corresponding excavation plane graph；
Fig. 7 is the excavation structural profile schematic diagram excavating III annular base tunnel in one embodiment of the invention；
Fig. 8 is Fig. 7 of the present invention corresponding excavation plane graph；
Fig. 9 is that the excavation structural profile of central excavation pillar " ten " font annular base tunnel in one embodiment of the invention shows
It is intended to；
Figure 10 is Fig. 9 of the present invention corresponding excavation plane graph；
Figure 11 is that in one embodiment of the invention, the remaining cross section of central excavation pillar is opening of fan-shaped annular base tunnel
Digging structure generalized section；
Figure 12 is Figure 11 of the present invention corresponding excavation plane graph.
Specific embodiment
Below with reference to accompanying drawing, clearly complete description is carried out it is clear that being retouched to the technical scheme of various embodiments of the present invention
The embodiment stated is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, this
The obtained all other embodiment on the premise of not needing creative work of field those of ordinary skill, all in institute of the present invention
In the range of protection.
Need, using excessive gib, to open when considering that ultra-large type underground dome is using existing dome excavation technology up till now
Scrape out this increase, and excavate the problem that safety is difficult to ensure that, present embodiments provide a kind of underground dome excavation construction arrangement knot
Structure and excavation method.
A kind of underground dome excavation construction arrangement, including：Centre strut and construction passage；Construction passage is from underground vault
Top is outer to extend to centre strut；Centre strut is the step-like column construction successively decreasing from bottom to top；The side of centre strut under
And the excavation of the annular base tunnel of upper setting III uncovers face, the excavation of I 3 annular base tunnels uncovers face, the excavation of I 1 annular base tunnels uncover face,
Uncover face, the excavation of II annular base tunnel of the excavation of I 2 annular base tunnels uncovers face；In centre strut, setting " ten " font excavates and uncovers
Face.
A kind of dome excavation method of underground, including：Step 1, reserved centre strut supports annular base tunnel country rock on dome；Step
Rapid 2, excavate dome annular base tunnel country rock, and carry out support reinforcement；Dome annular base tunnel includes：III annular from bottom to top is led
Hole, I 3 annular base tunnels, I 1 annular base tunnels, I 2 annular base tunnels, II annular base tunnel；Step 3, center " ten " word of central excavation pillar
In frame, annular base tunnel core column, carries out support reinforcement；Step 4, central excavation pillar remaining annular base tunnel, carry out supporting and add
Gu.
Using reserved centre strut region, dome country rock is supported with the core column reserved to dome central authorities, improves country rock
Stability；Neutral pillar is reduce successively from top to bottom step-like, carries out annular excavation with guide pit, carry out in digging process
Shield is reinforced, last central excavation pillar, and progressively carries out support reinforcement.This Construction Arrangement and excavation method can reduce temporarily
Support, save construction costs, improve the safety of the stability of country rock and construction in dome digging process simultaneously.
Next each technical scheme is described in detail：
The present invention, in order to reduce the use of falsework, reserves centre strut region first, supports dome with centre strut
Upper annular base tunnel country rock, subsequently carries out the dome annular excavation of base tunnel and supporting, subsequently central excavation pillar again.Applied based on this
Work core concept, inventor carries out the arrangement of structure first to underground dome excavation construction, such as Fig. 1, shown in 2：
Including：Centre strut and construction passage 1；Centre strut is to be reserved, and construction passage 1 is to enter vault outside the dome of underground
The main thoroughfare excavated in top, construction passage 1 extends to centre strut from outside the dome of underground.This passage is unobstructed be two with
On, and with centre strut for symmetrical centre symmetrically, excavate from symmetrical direction and can keep integrally-built stable.Center
Pillar is different from the basically identical cylinder of conventional diameter of section up and down, and this centre strut is the step-like post successively decreasing from bottom to top
Shape structure, forms bottom greatly, and the little structure in top can improve the support force of central area further.The side of centre strut is certainly
The excavation of the annular base tunnel of lower and upper setting III uncovers face, and the excavation of I 3 annular base tunnels uncovers face, and the excavation of I 1 annular base tunnels uncovers
Uncover face, the excavation of II annular base tunnel of face, the excavation of I 2 annular base tunnels uncovers face, and in centre strut, setting " ten " font excavates and connects
Show up, construction passage 1 all has duck eye (working tunnel) to extend to these excavations corresponding to uncover face.
Based on the centre strut of above-mentioned step-like structure, I 1 annular base tunnels advanced 3-5 rice than I 2 annular base tunnels, I 2 annulars are led
Hole advanced 3-5 rice than I 3 annular base tunnels, I 1 annular base tunnels are between I 2 annular base tunnels and I 3 annular base tunnels, I 3 annular base tunnels and
The I 1 annular excavation with guide pits face that uncovers is same step side, and the excavation of the I 2 annular base tunnels face that uncovers is that I 1 annular excavation with guide pits uncover
Face place step upper level step.
Need to carry out in time support reinforcement after annular excavation with guide pit, therefore, I 1 annular base tunnels, I 2 annular base tunnels, I 3 rings
Shape base tunnel, II annular base tunnel, the III annular face of base tunnel, the face at centre strut top are sprayed with concrete from inside to outside successively
Layer, steel fiber reinforced concrete layer；Spray the steel fiber reinforced concrete layer of C30 first, thickness, at 5 centimetres, subsequently sprays C25 concrete layer, thick
Degree is at 20 centimetres.Wherein steel fiber reinforced concrete layer hangs Φ 6 bar-mat reinforcement, and steel fiber reinforced concrete layer is reinforced further.Coagulation
Soil layer anchors the first hollow bolt, the second hollow bolt；The length of the first anchor pole 2 is more than the length of the second anchor pole 3, the first anchor pole
2 and second anchor pole 3 be alternately arranged.First anchor pole 2 is Φ 28 first hollow anchor bar, L=6m；Second anchor pole 3 is that Φ 22 second is empty
Heart anchor pole, L=3m.
In order to reinforce further, in the technology of technique scheme, inventor has and has carried out Design of Reinforcement further, should
Arrangement also includes prestress anchorage cable row, (does not carry out the first prestressing force by multiple uniformly alternate prestress anchorage cables herein
Anchor cable, the differentiation of the second prestress anchorage cable, what it adopted is all prestress anchorage cable, and numbering is intended merely to say in detail in the claims
Bright becomes apparent from) surround, one end of each prestress anchorage cable is anchored in face (the specifically face of I 3 annular base tunnels
The concrete layer of spray)；Because I 3 annular base tunnels are loop configuration, therefore prestress anchorage cable is arranged as circulus, two neighboring pre-
Stress anchor cable circumferential distance be setting value, setting value can according to the size specifically descending dome, and prestress anchorage cable diameter,
Determining, those skilled in the art can implement according to general knowledge for number, length.
Similar with technique scheme, also include prestress anchorage cable row, surrounded by multiple uniformly alternate prestress anchorage cables,
Each prestress anchorage cable (does not carry out the first prestress anchorage cable, the differentiation of the second prestress anchorage cable, what it adopted is all pre- herein
Stress anchor cable, what numbering was intended merely to illustrate in detail in the claims becomes apparent from) one end be anchored in the area of III annular base tunnel
The concrete layer in face；Its support reinforcement is carried out to III annular base tunnel.Prestress anchorage cable is arranged as circulus, two neighboring prestressed anchor
Rope circumferential distance is setting value, setting value can according to the size specifically descending dome, and the diameter of prestress anchorage cable, number,
Determining, those skilled in the art can implement length according to general knowledge.
In addition, reinforce the first anchor pole 2 in III annular excavation with guide pit, after the second anchor pole 3, also carried out annular collar tie beam plus
Gu.The width of annular collar tie beam and high all according to the size of dome, highly determining, those skilled in the art can be real according to existing knowledge
Apply.
This Construction Arrangement structure dome above centre strut has similarly sprayed steel fiber reinforced concrete layer, concrete layer,
Hang bar-mat reinforcement in steel fiber reinforced concrete layer simultaneously, anchor the first anchor pole 2, the second anchor pole 3 in concrete layer, the two length is different,
Distribute alternately.
Next, digging in-situ is carried out based on underground dome excavation construction arrangement in above-mentioned each technical scheme：
Step 101, reserved centre strut supports annular base tunnel country rock on dome；
Step 102, excavates dome annular base tunnel country rock, and carries out support reinforcement；
Dome annular base tunnel includes：The annular base tunnel of III from bottom to top, I 3 annular base tunnels, I 1 annular base tunnels, I 2 annulars are led
Hole, II annular base tunnel；
Step 103, in center " ten " cabinet frame of central excavation pillar, annular base tunnel core column, carries out support reinforcement；
Step 104, central excavation pillar remaining annular base tunnel, carry out support reinforcement.
Next, being illustrated to above-mentioned excavation method by a specific embodiment：
The first step, as shown in Figure 3,4, adopts little pilot tunnel to enter collecting and distributing hall by main channel, excavates I successively using benching tunnelling method
1st, I 2, I 3 annular base tunnel, wherein I 1 annular base tunnels 3-5m more advanced than I 2 annular base tunnels, I 2 annular base tunnels are more advanced than I 3 annular base tunnels
3-5m；5cm thickness C30 steel fiber reinforced concrete is just sprayed after excavation；After hanging Φ 6 bar-mat reinforcement@20cm × 20cm, then it is mixed to spray 20cm thickness C25
Solidifying soil；Perform Φ 28 ,@1.5 × 1.5m, L=6m hollow bolt 22；Φ 22 ,@1.5 × 1.5m, L=3m hollow bolt 3, length
It is alternately arranged；Perform first row 1000KN prestress anchorage cable 4, long 20m, circumferential distance 2.5m.Using Φ 28 ,@1.5 × 1.5m, L
=6m grouting rock bolt 5 anchors.
Second step, excavates II annular base tunnel rock mass, as shown in Figure 5,6；5cm thickness C30 steel fiber reinforced concrete is just sprayed after excavation；
After hanging Φ 6 bar-mat reinforcement@20cm × 20cm, then spray 20cm thickness C25 concrete；Perform Φ 28 hollow bolt 2@1.5 × 1.5m, L=
6m；Φ 22 hollow bolt 3@1.5 × 1.5m, L=3m, anchor pole length is alternately arranged.
3rd step, excavates III annular base tunnel rock mass, as shown in Figure 7,8；5cm thickness C30 steel fiber reinforced concrete is just sprayed after excavation；
After hanging Φ 6 bar-mat reinforcement@20cm × 20cm, then spray 20cm thickness C25 concrete；Perform Φ 28 hollow bolt 2@1.5 × 1.5m, L=
6m；Φ 22 hollow bolt 3@1.5 × 1.5m, L=3m, anchor pole length is alternately arranged；Perform second row 1000KN prestress anchorage cable
4, long 20m, circumferential distance 2.5m；Perform annular collar tie beam, collar tie beam width 1.0m, high 1.35m.
4th step, " cross " to wearing in excavation annular base tunnel core column, as shown in Fig. 9,10；After excavation, just spray 5cm is thick
C30 steel fiber reinforced concrete；After hanging Φ 6 bar-mat reinforcement@20cm × 20cm, then spray 20cm thickness C25 concrete；Perform Φ 28 hollow bolt
2@1.5 × 1.5m, L=6m；Φ 22 hollow bolt 3@1.5 × 1.5m, L=3m, anchor pole length is alternately arranged.
5th step, excavates V annular base tunnel rock mass, as shown in Figure 11,12；5cm thickness C30 steel fibre coagulation is just sprayed after excavation
Soil；After hanging Φ 6 bar-mat reinforcement@20cm × 20cm, then spray 20cm thickness C25 concrete；Perform Φ 28 hollow bolt 2@1.5 × 1.5m, L
=6m；Φ 22 hollow bolt 3@1.5 × 1.5m, L=3m, anchor pole length is alternately arranged.
6th step, after just Zhi Wending, removes gib, benching tunnelling method excavates remaining rock mass successively, performs tunnel floor
And paving.
The core concept of the technical program is first Ring Cutting dome surrounding country rock, and reserved central nucleuss stem supports on dome
Annular base tunnel country rock, makes full use of the reserved core column in dome central authorities and supports dome country rock, to ensure the stability of country rock, treat vault
After top apical ring shape base tunnel support construction completes and stablizes, then excavate core column.The arrangement of this excavation sequence can be fully sharp
With the supporting role of central nucleuss stem, thus significantly reducing temporary support, saving construction costs, improve dome simultaneously and open
The safety of the stability of country rock and construction during digging.
The various embodiments that the present invention provides can be mutually combined as needed in any way, is obtained by this combination
Technical scheme, also within the scope of the invention.
Obviously, without departing from the spirit and scope of the present invention, those skilled in the art can enter to the present invention
Row is various to be changed and modification.If changing to these of the present invention and modification being in the claim of the present invention and its equivalent
Within the scope of, then the present invention also will comprise these changes and modification.
Claims (10)
1. a kind of underground dome excavation construction arrangement is it is characterised in that include：Centre strut and construction passage；Described apply
Work passage extends to described centre strut from outside the dome of underground, and described passage is two or more, and with centre strut be symmetrically in
The heart is symmetrical；Described centre strut is the step-like column construction successively decreasing from bottom to top, and bottom is big, and top is little；Described center
The excavation that the side of pillar arranges III annular base tunnel from bottom to top uncovers face, and the excavation of I 3 annular base tunnels uncovers face, and I 1 annulars are led
The excavation in hole uncover face, the excavation of II annular base tunnel of face, the excavation of I 2 annular base tunnels that uncover uncovers face；Set in described centre strut
Put " ten " font and excavate the face that uncovers.
2. underground as claimed in claim 1 dome excavation construction arrangement is it is characterised in that described I 1 annular base tunnels compare institute
State I 2 annular base tunnel advanced 3-5 rice, described I 2 annular base tunnels advanced 3-5 rice than described I 3 annular base tunnels.
3. underground as claimed in claim 2 dome excavation construction arrangement is it is characterised in that described I 1 annulars are led
Hole, I 2 annular base tunnels, I 3 annular base tunnels, described II annular base tunnel, the face of described III annular base tunnel, described centre strut top
The face in portion is sprayed with concrete layer, steel fiber reinforced concrete layer from inside to outside successively；Described steel fiber reinforced concrete layer hangs bar-mat reinforcement, described
Concrete layer anchors the first hollow bolt, the second hollow bolt；The length of described first anchor pole is more than the length of described second anchor pole
Degree, described first anchor pole and described second anchor pole are alternately arranged.
4. the underground dome excavation construction arrangement as described in any one of claim 1-3 is it is characterised in that also include first
Prestress anchorage cable is arranged, and described first prestress anchorage cable is arranged as circulus, is enclosed by multiple the first uniformly alternate prestress anchorage cables
Become, one end of each described first prestress anchorage cable is anchored in the face of described I 3 annular base tunnels；Two neighboring first in advance should
Power anchor cable circumferential distance is setting value.
5. underground as claimed in claim 4 dome excavation construction arrangement is it is characterised in that also include the second prestressed anchor
Rope is arranged, and described second prestress anchorage cable is arranged as circulus, is surrounded by multiple the second uniformly alternate prestress anchorage cables, each institute
The one end stating the second prestress anchorage cable is anchored in the face of described III annular base tunnel；Two neighboring second prestress anchorage cable ring
Spacing is setting value.
6. a kind of dome excavation method of underground is it is characterised in that include：
Step 1, reserved centre strut supports annular base tunnel country rock on dome；
Step 2, excavates dome annular base tunnel country rock, and carries out support reinforcement；Described dome annular base tunnel includes：From bottom to top
III annular base tunnel, I 3 annular base tunnels, I 1 annular base tunnels, I 2 annular base tunnels, II annular base tunnel；
Step 3, excavates annular base tunnel core column in center " ten " cabinet frame of described centre strut, carries out support reinforcement；
Step 4, excavates described centre strut remaining annular base tunnel, carries out support reinforcement.
7. underground as claimed in claim 6 dome excavation method is it is characterised in that described step 2 includes：
Step 21, benching tunnelling method excavates I 1 annular base tunnels, I 2 annular base tunnels, I 3 annular base tunnels, carries out support reinforcement, wherein I 1 annulars
Base tunnel is between I 2 annular base tunnels and I 3 annular base tunnels；
Step 22, excavates II annular base tunnel above I 2 annular base tunnels, carries out support reinforcement；
Step 23, excavates III annular base tunnel below I 3 annular base tunnels, carries out support reinforcement.
8. underground as claimed in claim 7 dome excavation method is it is characterised in that described step 21 includes：
I 1 annular base tunnels, I 2 annular base tunnels, I 3 annular base tunnels, described I 1 annular base tunnel ratios described I 2 are excavated successively using benching tunnelling method
The advanced 3-5 rice of annular base tunnel, described I 2 annular base tunnels advanced 3-5 rice than described I 3 annular base tunnels；
Just stir cement and soft soil in deep ground, then hangs bar-mat reinforcement；
Pneumatically placed concrete again, annular anchoring the first hollow bolt, the second hollow bolt, the length of described first anchor pole is more than described the
The length of two anchor poles, described first anchor pole and described second anchor pole are alternately arranged；
Annular anchors multiple first prestress anchorage cables.
9. the underground dome excavation method as described in any one of claim 6-8 is it is characterised in that described step 3 includes：
In described centre strut " ten " font to wearing in excavation annular base tunnel core column；
Just stir cement and soft soil in deep ground, then hangs bar-mat reinforcement；
Pneumatically placed concrete again, annular anchoring the first hollow bolt, the second hollow bolt, the length of described first anchor pole is more than described the
The length of two anchor poles, described first anchor pole and described second anchor pole are alternately arranged；
Annular anchors multiple second prestress anchorage cables.
10. underground as claimed in claim 9 dome excavation method is it is characterised in that after described step 4, described underground vault
Top excavation method also includes：
Remove gib；
Benching tunnelling method excavates remaining rock mass successively, builds tunnel floor and paving.
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| CN114109449B (en) * | 2021-11-22 | 2023-08-08 | 中国电建集团成都勘测设计研究院有限公司 | Large-span underground cavern dome supporting structure |
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| US4370077A (en) * | 1980-08-04 | 1983-01-25 | Colgate Stirling A | Method of pressurizing and stabilizing rock by periodic and repeated injections of a settable fluid of finite gel strength |
| CN103174429B (en) * | 2013-03-01 | 2015-05-20 | 河海大学 | Underground cavity extra-large dome excavating construction method |
| CN103256053B (en) * | 2013-05-21 | 2015-07-22 | 中铁十六局集团第四工程有限公司 | Excavation and construction method of underground cavity ball coronary dome |
| CN203867584U (en) * | 2014-05-13 | 2014-10-08 | 中国水电顾问集团华东勘测设计研究院有限公司 | Large diameter underground cavity dome supporting strengthening structure |
| CN203962002U (en) * | 2014-06-13 | 2014-11-26 | 长江勘测规划设计研究有限责任公司 | The reserved center of underground nuclear reactor cavern super-span dome rock pillar Construction Arrangement |
| CN204532356U (en) * | 2015-04-28 | 2015-08-05 | 中铁工程设计咨询集团有限公司 | Underground dome excavation construction arrangement |
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