CN110566227A - tunnel outlet section bias voltage deformation treatment method - Google Patents
tunnel outlet section bias voltage deformation treatment method Download PDFInfo
- Publication number
- CN110566227A CN110566227A CN201910891053.XA CN201910891053A CN110566227A CN 110566227 A CN110566227 A CN 110566227A CN 201910891053 A CN201910891053 A CN 201910891053A CN 110566227 A CN110566227 A CN 110566227A
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- tunnel
- steel plate
- box girder
- deformation
- connecting steel
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011435 rock Substances 0.000 claims abstract description 27
- 238000010276 construction Methods 0.000 claims abstract description 12
- 238000009412 basement excavation Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 60
- 239000010959 steel Substances 0.000 claims description 60
- 238000004873 anchoring Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 230000009545 invasion Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a tunnel exit section bias deformation treatment method, and relates to the technical field of tunnel construction. And (4) reinforcing the support by using anchor cables so as to resist large deformation of surrounding rocks caused by shallow-buried bias and extrusion tunnels. And primary support is radially grouted at the back, so that surrounding rocks outside the tunnel are solidified, the deformation resistance of the surrounding rocks is improved, the stability of the surrounding rocks during excavation operation is improved, and the operation safety is ensured. The self-stabilizing thickness and the self-stabilizing time of the surrounding rock are improved, the strength of a primary support structure is increased, 70% -90% of the stress of the surrounding rock of the primary support arm is enabled, and 10% -30% of the stress of the surrounding rock is borne by the secondary lining, so that the operation safety is ensured. The slurry adopts fast-hardening micro-expansion sulphoaluminate cement single slurry, and has good effect on carbonaceous shale geology.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a method for treating bias deformation of a tunnel exit section.
Background
The full length of a high-speed rail double-line tunnel is 6916m at the speed of 350 km per hour, the beginning-end mileage DK490+731-DK497+647, the maximum buried depth is 439m, and the right side of a line at DK494+400 is provided with an inclined shaft which is 1102m long, the whole tunnel is divided into three work areas of an inlet, an inclined shaft and an outlet, wherein the work area of the inlet bears 2200m of a main tunnel, the work area of the inclined shaft bears 2666m of the main tunnel, and the work area of the outlet bears 2050m of the main tunnel. The exit end of the tunnel is positioned on a slope with the height of more than 70 meters and the gradient of 30-45 degrees, the tunnel is buried shallowly, biased and passes through a rock pile, the excavation reveals that the geological conditions are poor, the lithology is black and gray black carbonaceous shale, the shale is thin and broken, and the phenomena of large-area cracking of a primary support, serious invasion and limit deformation and the like occur for many times in the excavation process. And 3, entering a hole 63.2 meters from the outlet end, backfilling the tunnel face, performing back pressure, quickly performing secondary lining for 48 meters, and stopping construction.
The measures of advancing the pipe shed and the small guide pipe, increasing the size of the steel arch frame, grouting reinforcement and the like adopted in the prior art scheme can not control the serious deformation of the large area of the primary support, can not meet the construction requirement, causes the limit of the primary support invasion, can carry out secondary lining only by reworking and replacing the arch frame and spraying concrete again, and can ensure the thickness of the secondary lining concrete. The main reason is that the surrounding rock is buried shallowly and biased, and belongs to the extruded surrounding rock, and the measures adopted in the design scheme are not strong in pertinence and cannot solve geological disasters.
disclosure of Invention
In order to solve the technical problems, the invention provides a method for treating bias deformation of a tunnel outlet section, which aims to solve the tunnel construction problem in a shallow-buried bias environment of surrounding rocks.
in order to achieve the purpose, the invention provides the following scheme:
the invention provides a tunnel exit section bias deformation treatment method, which comprises the following steps:
Firstly, excavating; adopting a three-step construction method;
Secondly, erecting an arch frame of the I-shaped steel box girder; erecting a prefabricated I-shaped steel box girder arch center on an excavation part, and applying a locking anchor pipe and a connecting rib;
Thirdly, spraying concrete;
Fourthly, constructing an anchor cable; connecting one end of an anchor cable with an I-shaped steel box girder arch center, and anchoring the other end of the anchor cable on the ground outside the tunnel;
Fifthly, grouting construction is carried out on the radial back of the primary support; and (5) solidifying the surrounding rock at the periphery of the tunnel, and further increasing the deformation resistance of the surrounding rock.
Optionally, in the first step, the footage is 0.6 meters per cycle.
Optionally, the i-steel box girder arch center comprises two i-steels arranged in parallel, the shapes of the two i-steels are matched with the shape of the tunnel, and a connecting steel plate is arranged between the two i-steels.
optionally, the distance between the two i-beams is 0.15 m.
optionally, the size of the connecting steel plate is 30 cm × 20 cm, the thickness of the connecting steel plate is 2 cm, and a circular hole with a radius of 7 cm is formed in the middle of the connecting steel plate.
Optionally, the connecting steel plate is connected with the i-shaped steel through full weld.
optionally, the distance between adjacent i-steel box girder arches is 0.6 m.
optionally, in the third step, a connecting steel plate on the arch frame of the i-steel box girder needs to be reserved when the concrete is sprayed.
Optionally, the anchor cable is connected with a connecting steel plate on the arch frame of the i-steel box girder.
Compared with the prior art, the invention has the following technical effects:
according to the tunnel exit section bias deformation treatment method, the I-shaped steel box beam is adopted to replace common I-shaped steel, so that the support strength is greatly enhanced. Anchor cables are used for reinforcing support in the tunnel to resist shallow buried bias and large deformation of surrounding rocks caused by the extrusion tunnel. And primary support is radially grouted at the back, surrounding rocks outside the tunnel in a certain range are solidified to form a whole, the deformation resistance of the surrounding rocks is further improved, the stability of the surrounding rocks during excavation operation is improved, and the operation safety is ensured. Meanwhile, the self-stabilization thickness and the self-stabilization time of the surrounding rock are improved, the strength of a primary support structure is increased, 70% -90% of the stress of the surrounding rock of the primary support arm is enabled, the secondary lining only bears 10% -30% of the stress of the surrounding rock, and the operation safety of the high-speed rail is ensured. The slurry adopts fast-hardening micro-expansion sulphoaluminate cement single slurry, and has a very good effect on carbonaceous shale geology. As the carbonaceous shale is instantly melted when meeting water, the common cement paste not only can not achieve the consolidation effect, but also can cause great damage to the surrounding rock structure to cause instability, and the quick-hardening micro-expansive sulphoaluminate cement has no problem, thereby really achieving the effect of grouting reinforcement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic front view of a method for treating a tunnel exit section by bias deformation according to the present invention;
FIG. 2 is a schematic side view of the method for treating the tunnel exit section by bias deformation according to the present invention;
FIG. 3 is a schematic structural diagram of an I-shaped steel box girder in the tunnel exit section bias deformation treatment method of the present invention;
fig. 4 is a schematic plan view of the tunnel construction according to the present invention.
Description of reference numerals: 1. an anchor rod; 2. an anchor cable; 3. a rock face; 4. primary branch surface; 5. anchoring a steel plate; 6. a palm surface; 7. an I-steel box beam; 8. i-shaped steel; 9. a connecting plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
As shown in fig. 1, the present embodiment provides a method for treating a tunnel exit section by bias deformation, comprising the following steps:
Firstly, excavating; adopting a three-step construction method; the footage is 0.6 meter per cycle;
Secondly, erecting an arch center of the I-shaped steel box girder 7; erecting a prefabricated H-shaped steel box girder 7 arch center on an excavation part, and applying a locking anchor pipe and a connecting rib;
Thirdly, spraying concrete; note that an anchor steel plate 5 is reserved;
fourthly, constructing an anchor cable 2; one end of an anchor cable 2 is connected with an I-shaped steel box girder 7 arch center, and the other end of the anchor cable is anchored on the ground outside the tunnel;
Fifthly, grouting construction is carried out on the radial back of the primary support; and (5) solidifying the surrounding rock at the periphery of the tunnel, and further increasing the deformation resistance of the surrounding rock.
in this embodiment, as shown in fig. 1 to 4, the arch of the I-steel box girder 7 is formed by two I25I-steels 8 with a distance of 0.15 m, and connecting steel plates are disposed on the inner and outer surfaces of the two I-steels 8 for full-length welding, the connecting steel plates are 30 cm × 20 cm × 2 cm, and the distance between adjacent connecting steel plates is 1.5 m.
an anchoring steel plate 5 is welded on an arch center of the I-shaped steel box girder 7, the anchoring steel plate 5 is a steel plate with the diameter of 30 cm multiplied by 40 cm multiplied by 3 cm, a hole is drilled in the middle, the radius of the drilled hole is 7 cm, and the contact surface of the anchoring steel plate 5 and the I-shaped steel box girder 7 is fully welded. The arrangement pitch of the anchor steel plates 5 is 3 m × 2.85 m.
when erecting the 7 arch center of the I-shaped steel box girder, a phi 42 multiplied by 4.5 meter locking anchor pipe and a phi 22 steel bar are used as connecting bars.
The anchor rope 2 with the length of 30 meters is anchored on an anchoring steel plate 5, the other end of the anchor rope 2 is anchored on a surrounding slope rock mass, a dry drill is used for drilling the anchor rope 2, pure cement with the water-cement ratio of 0.4-0.5 is adopted for grouting, 525# Portland cement can be adopted as the cement, 10% of UEA-Z type composite expanding agent and 0.6% of high-efficiency early-strength water reducing agent are added, and the grouting pressure is 0.6-0.8 Mpa.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. a method for treating the bias deformation of a tunnel outlet section is characterized by comprising the following steps:
Firstly, excavating; adopting a three-step construction method;
secondly, erecting an arch frame of the I-shaped steel box girder; erecting a prefabricated I-shaped steel box girder arch center on an excavation part, and applying a locking anchor pipe and a connecting rib;
Thirdly, spraying concrete;
fourthly, constructing an anchor cable; connecting one end of an anchor cable with an I-shaped steel box girder arch center, and anchoring the other end of the anchor cable on the ground outside the tunnel;
Fifthly, grouting construction is carried out on the radial back of the primary support; and (5) solidifying the surrounding rock at the periphery of the tunnel, and further increasing the deformation resistance of the surrounding rock.
2. The method of claim 1 wherein in the first step the footage is 0.6 meters per cycle.
3. the method according to claim 1, wherein the i-steel box girder arch comprises two i-steels arranged side by side, the shape of the two i-steels is matched with that of the tunnel, and a connecting steel plate is arranged between the two i-steels.
4. The method of claim 3, wherein the spacing between the two I-beams is 0.15 meters.
5. The treatment method for the bias deformation of the tunnel outlet section according to claim 3, wherein the size of the connecting steel plate is 30 cm x 20 cm, the thickness of the connecting steel plate is 2 cm, and a circular hole with the radius of 7 cm is formed in the middle of the connecting steel plate.
6. the method of claim 3, wherein the connecting steel plate is connected to the I-beam by a full-length weld.
7. the method according to claim 3, wherein the distance between adjacent H-beam arches is 0.6 m.
8. The method for treating tunnel exit section bias deformation according to claim 1, wherein in the third step, a connecting steel plate on the joist steel box girder arch frame is reserved when the concrete is sprayed.
9. The method according to claim 1, wherein the anchor cables are connected to connecting steel plates on the i-beam arch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910891053.XA CN110566227A (en) | 2019-09-20 | 2019-09-20 | tunnel outlet section bias voltage deformation treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910891053.XA CN110566227A (en) | 2019-09-20 | 2019-09-20 | tunnel outlet section bias voltage deformation treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110566227A true CN110566227A (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910891053.XA Pending CN110566227A (en) | 2019-09-20 | 2019-09-20 | tunnel outlet section bias voltage deformation treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047849A (en) * | 2021-05-20 | 2021-06-29 | 宜春学院 | Soft rock bias tunnel lining support construction method |
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| US4477204A (en) * | 1983-01-17 | 1984-10-16 | Clarence J. Rohde | Cast concrete element for underground tubular structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047849A (en) * | 2021-05-20 | 2021-06-29 | 宜春学院 | Soft rock bias tunnel lining support construction method |
| CN113047849B (en) * | 2021-05-20 | 2024-03-01 | 宜春学院 | Construction method for lining support of soft rock biased tunnel |
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Application publication date: 20191213 |
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