CN113847041A - Method for treating soft collapse area in tunnel excavation - Google Patents
Method for treating soft collapse area in tunnel excavation Download PDFInfo
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- CN113847041A CN113847041A CN202110963036.XA CN202110963036A CN113847041A CN 113847041 A CN113847041 A CN 113847041A CN 202110963036 A CN202110963036 A CN 202110963036A CN 113847041 A CN113847041 A CN 113847041A
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- 238000000034 method Methods 0.000 title claims abstract description 83
- 238000009412 basement excavation Methods 0.000 title claims abstract description 56
- 239000004568 cement Substances 0.000 claims abstract description 69
- 239000002002 slurry Substances 0.000 claims abstract description 34
- 239000002689 soil Substances 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 claims description 81
- 239000011435 rock Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 12
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/01—Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
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- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a method for treating a soft collapse area in tunnel excavation, which comprises the following steps: filling soil back to the face of the collapse position in the tunnel excavation, wherein the soil back filling forms a support body, and the support body plays a supporting role on the face of the soft layer so as to avoid secondary collapse; filling and leveling a collapse area in the tunnel excavation process through concrete and cement paste; cement slurry is injected into the soft layer tunnel face, and the soft layer tunnel face is reinforced by the cement slurry; after the strength of cement slurry injected into the soft layer tunnel face reaches the predicted strength, excavating by adopting an annular step method or a CD method; the collapse area is filled and leveled, so that secondary collapse in the construction process is avoided, the tunnel is guaranteed to be safely and stably excavated smoothly, and the construction efficiency and the safety of workers are improved.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a method for treating a soft collapse area in tunnel excavation.
Background
At present, when a local soft layer or collapse area is encountered in the tunnel excavation process, a step method or a CD method is usually adopted for construction, a small conduit is inserted into the soft layer through a tunnel face to be excavated along the central axis direction of an arch frame, grouting is performed into the soft layer through the small conduit, and then the soft layer is reinforced.
However, the soft layer is treated in a manner of grouting reinforcement of the soft layer through the small guide pipe, and excavation is slow, so that construction efficiency is low; meanwhile, excavation is dangerous, secondary collapse is easy to generate in the construction process, and the safety of workers is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for treating a soft collapse area in tunnel excavation, which has the advantages that the construction efficiency can be improved; meanwhile, the safety of workers is improved.
The above object of the present invention is achieved by the following technical solutions: a method for processing a soft collapse area in tunnel excavation comprises the following steps:
reversely filling soil on the soft layer tunnel face at the collapse position in the tunnel excavation, wherein the reversely filled soil forms a support body which plays a supporting role on the soft layer tunnel face so as to avoid secondary collapse;
filling and leveling a collapse area in the tunnel excavation process through concrete and cement paste;
injecting cement slurry into the soft layer tunnel face, and reinforcing the soft layer tunnel face by the cement slurry;
and after the strength of the cement slurry injected into the soft stratum tunnel face reaches the predicted strength, excavating by adopting an annular step method or a CD method.
Preferably, the method for treating a soft collapse area in tunnel excavation provided by the present invention further includes, after the collapse area in the tunnel excavation process is filled with the concrete and the cement slurry, before the cement slurry reinforces the soft layer face by injecting the cement slurry into the soft layer face: after the strength of cement paste injected into the collapse area reaches preset strength and the supporting body is stable, a plurality of pipe sheds are inserted at the top of the excavated face, one ends of the pipe sheds are inserted into the hard rock layer through the soft layer face or the collapse area, and the other ends of the pipe sheds are connected with an arch frame of a constructed tunnel primary support.
Preferably, according to the method for treating the soft collapse area in tunnel excavation provided by the invention, a protective layer is sprayed on one side of the support body, which is away from the tunnel face of the soft layer, and the protective layer is used for fixing the support body.
Preferably, the method for treating a soft collapse area in tunnel excavation provided by the invention, which fills and levels the collapse area in the tunnel excavation process through concrete and cement paste, comprises the following steps: a grouting pipe, a guide pipe and an exhaust pipe are embedded in a collapse cavity of the collapse area, one end of each of the grouting pipe, the guide pipe and the exhaust pipe is embedded in the collapse cavity, the grouting pipe is used for injecting cement paste into the collapse cavity, the guide pipe is used for injecting concrete into the collapse cavity, and the exhaust pipe is used for exhausting gas in the concrete;
concrete is injected into the collapsing cavity through the guide pipe, and gas in the concrete in the collapsing cavity is exhausted through the exhaust pipe;
and after the concrete in the collapse cavity is initially set, cement paste is injected into the collapse cavity through the grouting pipe, and the cement paste is used for filling and compacting micro-gaps in the collapse area.
Preferably, in the method for treating the soft collapse area in tunnel excavation provided by the invention, the grouting pressure for injecting the cement paste into the collapsed cavity through the grouting pipe is 2.5Mpa-5 Mpa.
Preferably, the method for treating a soft collapse zone in tunnel excavation, provided by the present invention, includes the steps of injecting cement slurry into the soft layer tunnel face, and reinforcing the soft layer tunnel face with the cement slurry, including: a plurality of be used for to the liquid pipe of annotating of grout is injected into to soft layer palm face, it is a plurality of the one end of annotating the liquid pipe is all passed through the supporter is inserted and is located in the soft layer palm face.
Preferably, in the method for treating soft collapse areas in tunnel excavation provided by the invention, a plurality of pipe sheds are arranged at intervals around the circumference of the arch, and one end of each pipe shed, which is far away from the hard rock stratum, is connected with the arch through a fixing piece.
Preferably, the fixing member includes a U-shaped portion adapted to the pipe shed, a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are disposed at an opening end of the U-shaped portion opposite to each other;
first connecting portion with second connecting portion all with the bow member is connected, the pipe canopy deviates from the one end of hard rock stratum is inserted and is located in the U type portion, the periphery wall of pipe canopy supports the top on the internal perisporium of U type portion.
Preferably, the method for treating a soft collapse area in tunnel excavation provided by the present invention further comprises, after the strength of cement slurry injected into the soft layer tunnel face reaches the predicted strength and excavation is performed by using an annular step method or a CD method: after a preset distance is excavated, an arch center is erected, and the distance between every two adjacent arch centers is 40cm-50 cm.
Preferably, according to the method for treating the soft collapse area in tunnel excavation provided by the invention, a preset angle is clamped between the central axis of the pipe shed and the horizontal plane, and the preset angle ranges from 1 degree to 2 degrees.
In conclusion, the beneficial technical effects of the invention are as follows: the application provides a method for processing a soft collapse area in tunnel excavation, which comprises the following steps: filling soil back to the soft layer face at the collapse position in the tunnel excavation, wherein the soil back filling forms a support body, and the support body plays a supporting role in the soft layer face so as to avoid secondary collapse; filling and leveling a collapse area in the tunnel excavation process through concrete and cement paste; cement slurry is injected into the soft layer tunnel face, and the soft layer tunnel face is reinforced by the cement slurry; after the strength of cement slurry injected into the soft layer tunnel face reaches the predicted strength, excavating by adopting an annular step method or a CD method; the collapse area is filled and leveled, so that secondary collapse in the construction process is avoided, the tunnel is guaranteed to be safely and stably excavated smoothly, and the construction efficiency and the safety of workers are improved.
Drawings
Fig. 1 is a flowchart of a method for processing a soft collapse area in tunnel excavation according to an embodiment of the present invention.
Fig. 2 is a front view of tunnel excavation in the method for processing a soft collapse zone in tunnel excavation according to the embodiment of the present invention.
Fig. 3 is a sectional view of tunnel excavation in the method for treating a soft collapse zone in tunnel excavation according to the embodiment of the present invention.
Fig. 4 is a schematic connection diagram of an arch frame and a pipe shed in the method for treating a soft collapse area in tunnel excavation according to the embodiment of the present invention.
In the figure, 1, a tunnel; 10. a support body; 20. soft layer palm face; 201. a liquid injection pipe; 30. a landslide area; 301. a grouting pipe; 302. a conduit; 303. an exhaust pipe; 40. a pipe shed; 50. an arch frame; 60. a fixing member; 601. a U-shaped portion; 602. a first connection portion; 603. a second connecting portion; 70. core soil; 80. a hard rock formation.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 3, the method for treating a soft collapse area in tunnel excavation disclosed by the invention comprises the following steps:
s101, backfilling soil to the soft layer tunnel face 20 at the collapse position in the tunnel 1 excavation, wherein the backfilling soil forms a support body 10, and the support body 10 supports the soft layer tunnel face 20 to avoid secondary collapse.
Specifically, the supporting body 10 is in a slope shape, one side of the supporting body 10 abuts against the soft layer tunnel face 20, and the supporting body 10 is used for providing supporting force for the soft layer tunnel face 20 and avoiding collapse of the soft layer tunnel face 20.
Further, a protective layer is sprayed on one side of the support body 10, which is far away from the soft layer tunnel face 20, and the protective layer is used for fixing the support body 10; by spraying the protective layer, the firmness of the support body 10 is improved.
Illustratively, the protective layer is made of concrete.
Of course, the protective layer may also be a shell adapted to the support body 10; in the use process, the shell covers the support body 10, and the bottom end of the shell is connected with the ground.
And S102, filling and leveling the collapse area 30 in the tunnel 1 excavation process through concrete and cement paste.
Specifically, when the tunnel 1 is excavated, the collapse area 30 at the top of the tunnel 1 is excavated, a grouting pipe 301, a guide pipe 302 and an exhaust pipe 303 are embedded in a collapse cavity of the collapse area 30, one end of the grouting pipe 301, one end of the guide pipe 302 and one end of the exhaust pipe 303 are all embedded in the collapse cavity, the grouting pipe 301 is used for injecting cement paste into the collapse cavity, the guide pipe 302 is used for injecting concrete into the collapse cavity, and the exhaust pipe 303 is used for exhausting gas in the concrete; by providing the exhaust pipe 303, the gas in the concrete in the collapse cavity is exhausted, and difficulty in injecting the concrete is avoided.
A plurality of exhaust pipes 303 may be buried in the collapsing cavity, and the plurality of exhaust pipes 303 may be provided at intervals, thereby increasing the exhaust rate of gas in the concrete. For example, the exhaust pipe 303 may be made of PVC, and of course, the exhaust pipe 303 may also be made of metal.
Illustratively, cement slurry can be injected into the collapsed cavity through the grouting pipe 301 by means of high-pressure injection; of course, other methods can be adopted as long as the cement paste can be injected into the collapsed cavity.
The way of injecting concrete into the collapsed cavity through the conduit 302 is substantially the same as the way of injecting cement slurry into the collapsed cavity through the grouting pipe 301, and the embodiment does not describe the way of injecting concrete into the collapsed cavity through the conduit 302.
S102 includes the steps of:
and S1021, injecting concrete into the collapse cavity through the guide pipe 302, and exhausting gas in the concrete in the collapse cavity through the exhaust pipe 303.
The concrete in the collapsed cavity from which the gas is discharged through the gas discharge pipe 303 is a concrete slurry.
When the concrete slurry in the collapse cavity overflows from the exhaust pipe 303, the concrete is stopped from being injected into the collapse cavity.
S1022, after the concrete in the collapse cavity is initially set, cement paste is injected into the collapse cavity through the grouting pipe 301, and the cement paste is used for filling micro-gaps in the compact collapse area 30. And cement paste is injected into the collapsed cavity, so that the gap in the collapsed cavity is filled, and a compact overall filling collapse area is formed.
Specifically, the cement slurry injected into the collapse cavity through the grouting pipe 301 is pure cement slurry, and the grouting pressure is 2.5-5 Mpa.
S103, injecting cement slurry into the soft layer tunnel face 20, and reinforcing the soft layer tunnel face 20 by the cement slurry; thereby, secondary collapse is further avoided.
Specifically, by injecting cement slurry into the soft layer tunnel face 20, the cement slurry reinforces the soft layer tunnel face 20, and includes: a plurality of injection pipes 201 for injecting cement paste into the soft layer tunnel face 20, wherein one ends of the plurality of injection pipes 201 are inserted into the soft layer tunnel face 20 through the support body 10; during construction, the cement slurry flows into the soft layer face 20 through the injection pipe 201, thereby reinforcing the soft layer face 20.
Further, in this embodiment, after the collapse area 30 in the process of excavating the tunnel 1 is filled with concrete and cement paste, the cement paste is injected into the soft layer face 20, and before the cement paste reinforces the soft layer face 20, the method further includes:
after the strength of cement paste injected into the collapse area 30 reaches a preset strength and the support body 10 is stable, inserting a plurality of pipe sheds 40 at the top of the excavated soft layer tunnel face 20, wherein one ends of the plurality of pipe sheds 40 are inserted into the hard rock layer 80 through the soft layer tunnel face 20 or the collapse area 30, and the other ends of the plurality of pipe sheds 40 are connected with the arch frame 50 of the primary support of the constructed tunnel; a plurality of pipe sheds 40 are inserted through the top of soft layer face 20, have avoided appearing the secondary and have collapsed.
The preset intensity range is 65% -85% of the design intensity, and in the embodiment, the preset intensity is 75% of the design intensity.
Specifically, one ends of the plurality of pipe sheds 40, which are far away from the hard rock layer 80, are connected with the inner wall of the arch frame 50, the plurality of pipe sheds 40 are arranged at intervals around the circumference of the arch frame 50, and one ends of the pipe sheds 40, which are far away from the hard rock layer 80, are connected with the arch frame 50 through fixing pieces 60; by providing the fixing member 60, the fixing of the pipe shed 40 is facilitated.
Specifically, the pipe shed 40 may be made of seamless steel pipes, thereby improving the strength of the pipe shed 40. The wall thickness of the pipe shed 40 is 5mm-7mm, in the embodiment, the wall thickness of the pipe shed 40 is 6 mm; the length of the pipe shed 40 ranges from 8m to 10 m. Wherein, the end of the pipe shed 40 departing from the hard rock layer 80 extends into the constructed tunnel 1, the length range of the extending end of the pipe shed 40 is 1m-2m, and the extending end of the pipe shed 40 is connected with the arch frame 50.
Referring to fig. 3, the protruding ends of the pipe housing 40 are connected to a plurality of arches 50, thereby increasing the supporting force of the pipe housing 40. Wherein the pipe shed 40 can be connected with two, three or four arches 50. In this embodiment, the extending end of the pipe housing 40 is connected to two adjacent pipe housings 40 in sequence.
With reference to fig. 4, in the present embodiment, the fixing member 60 includes a U-shaped portion 601 adapted to the pipe housing 40, a first connecting portion 602, and a second connecting portion 603, wherein the first connecting portion 602 and the second connecting portion 603 are disposed at an opening end of the U-shaped portion 601; the first connecting portion 602 and the second connecting portion 603 are both connected to the arch frame 50, one end of the pipe shed 40 away from the hard rock layer 80 is inserted into the U-shaped portion 601, and the outer peripheral wall of the pipe shed 40 abuts against the inner peripheral wall of the U-shaped portion 601.
Specifically, first connecting portion 602 and second connecting portion 603 all with the inner wall looks adaptation of bow member 50, in the use, first connecting portion 602 and second connecting portion 603 all with the inner wall connection of bow member 50, the one end that the pipe shed 40 deviates from hard rock layer 80 is inserted and is located U type portion 601 in, the periphery wall of pipe shed 40 and the interior perisporium butt of U type portion 601.
In other embodiments, the end of the canopy 40 facing away from the hard rock layer 80 may be connected to the arch 50 by a welded connection.
Further, in this embodiment, a preset angle is clamped between the central axis of the pipe shed 40 and the horizontal plane, and the preset angle range is 1-2 °; the pipe shed 40 is obliquely arranged relative to the horizontal plane, so that the subsequent arch 50 can be conveniently erected on the tower, and the influence of the pipe shed 40 on the erection of the subsequent arch 50 is avoided.
Specifically, the end of the pipe shed 40 facing the hard rock layer 80 is inclined upward relative to the horizontal plane, and when the subsequent tower is provided with the arch 50, the arch 50 is positioned on the side of the pipe shed 40 facing the ground, thereby facilitating the erection of the arch 50.
Further, in this embodiment, cement slurry is injected into each of the plurality of pipe casings 40; the cement paste injected into the pipe shed 40 densely fills the pipe shed 40, thereby improving the strength of the pipe shed 40.
Wherein, insert between pipe canopy 40 and core soil 70 and establish a plurality of notes liquid pipe 201, the one end of a plurality of notes liquid pipe 201 is inserted through the supporter 10 and is located in the soft layer face of a palm 20, pours into grout into soft layer face of a palm 20 through annotating liquid pipe 201, from this, improves the stability of soft layer face of a palm 20, simultaneously, has improved the security of follow-up excavation.
And S104, after the strength of the cement paste injected into the soft layer tunnel face 20 reaches the predicted strength, excavating by adopting an annular step method or a CD method.
In an implementation manner of injecting cement slurry into the pipe shed 40, after the strength of the cement slurry injected into the soft layer tunnel face 20 reaches the predicted strength and the strength of the cement slurry in the pipe shed 40 reaches the predicted strength, the pipe shed is excavated by using an annular step method or a CD method.
Wherein the predicted intensity range is 65% -85% of the design intensity, and the predicted intensity range is 70% -90% of the design intensity; in this example, the predicted strength was 75% of the design strength, and the predicted strength was 80% of the design strength.
Further, in this embodiment, after the strength of the cement slurry injected into the soft layer tunnel face 20 reaches the predicted strength and the excavation is performed by using the circular bench method or the CD method, the method further includes: after a preset distance is excavated, erecting arch frames 50, wherein the distance between every two adjacent arch frames 50 is 40cm-50 cm; by building the arch 50 with the excavation, secondary collapse is further avoided.
Specifically, after the strength of the cement paste injected into the soft layer face 20 reaches the predicted strength, the support body 10 is excavated, then the soft layer face 20 into which the cement paste is injected is excavated according to a CD method or a step method, and the support is simultaneously excavated, so that the firmness of the tunnel 1 is improved, and secondary collapse is avoided.
And circulating S101 to S104 to perform excavation until the soft layer tunnel face 20 and the collapse area 30 are smoothly passed.
The application provides a method for processing a soft collapse area in tunnel excavation, which comprises the following steps: the soft layer and soft layer face 20 at the collapse position in the tunnel 1 is back filled with soil to form a support body 10, and the support body 10 supports the soft layer face 20 to avoid secondary collapse; filling and leveling a collapse area 30 in the tunnel 1 excavation process through concrete and cement paste; the soft layer tunnel face 20 is reinforced by cement paste which is injected into the soft layer tunnel face 20; after the strength of cement paste injected into the soft layer tunnel face 20 reaches the predicted strength, excavating by adopting an annular step method or a CD method; by filling and leveling the collapse area 30, secondary collapse is avoided in the construction process, the tunnel 1 is guaranteed to be safely and stably excavated smoothly, and the construction efficiency and the safety of workers are improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A method for processing a soft collapse area in tunnel excavation is characterized by comprising the following steps: the method comprises the following steps:
reversely filling soil on the soft layer tunnel face at the collapse position in the tunnel excavation, wherein the reversely filled soil forms a support body which plays a supporting role on the soft layer tunnel face so as to avoid secondary collapse;
filling and leveling a collapse area in the tunnel excavation process through concrete and cement paste;
injecting cement slurry into the soft layer tunnel face, and reinforcing the soft layer tunnel face by the cement slurry;
and after the strength of the cement slurry injected into the soft stratum tunnel face reaches the predicted strength, excavating by adopting an annular step method or a CD method.
2. The method for treating the soft collapse zone in tunnel excavation according to claim 1, wherein: after the collapse area in the tunnel excavation process is filled and leveled up through concrete and cement paste, through pouring into cement paste into the soft layer face, before the cement paste consolidates the soft layer face, still include:
after the strength of cement paste injected into the collapse area reaches preset strength and the supporting body is stable, a plurality of pipe sheds are inserted at the top of the excavated face, one ends of the pipe sheds are inserted into the hard rock layer through the soft layer face or the collapse area, and the other ends of the pipe sheds are connected with an arch frame of a constructed tunnel primary support.
3. The method for treating the soft collapse zone in tunnel excavation according to claim 1, wherein: the protective layer is sprayed on one side, deviating from the soft layer tunnel face, of the supporting body, and is used for fixing the supporting body.
4. The method for treating the soft collapse zone in tunnel excavation according to claim 1, wherein: fill and level up the area of collapsing in the tunnel excavation process through concrete and grout, include:
a grouting pipe, a guide pipe and an exhaust pipe are embedded in a collapse cavity of the collapse area, one end of each of the grouting pipe, the guide pipe and the exhaust pipe is embedded in the collapse cavity, the grouting pipe is used for injecting cement paste into the collapse cavity, the guide pipe is used for injecting concrete into the collapse cavity, and the exhaust pipe is used for exhausting gas in the concrete;
concrete is injected into the collapsing cavity through the guide pipe, and gas in the concrete in the collapsing cavity is exhausted through the exhaust pipe;
and after the concrete in the collapse cavity is initially set, cement paste is injected into the collapse cavity through the grouting pipe, and the cement paste is used for filling and compacting micro-gaps in the collapse area.
5. The method for treating the soft collapse zone in tunnel excavation according to claim 4, wherein: and the grouting pressure for injecting the cement paste into the collapsed cavity through the grouting pipe is 2.5-5 Mpa.
6. The method for treating the soft collapse zone in tunnel excavation according to claim 1, wherein: through to the grout is injected into soft layer face of a palm, the grout is right soft layer face of a palm is consolidated, includes:
a plurality of be used for to the liquid pipe of annotating of grout is injected into to soft layer palm face, it is a plurality of the one end of annotating the liquid pipe is all passed through the supporter is inserted and is located in the soft layer palm face.
7. The method for treating the soft collapse zone in tunnel excavation according to claim 2, wherein: the pipe sheds are arranged around the periphery of the arch at intervals, and one end, deviating from the hard rock stratum, of each pipe shed is connected with the arch through a fixing piece.
8. The method for treating the soft collapse zone in tunnel excavation according to claim 7, wherein: the fixing piece comprises a U-shaped part matched with the pipe shed, a first connecting part and a second connecting part, and the first connecting part and the second connecting part are oppositely arranged at the opening end of the U-shaped part;
first connecting portion with second connecting portion all with the bow member is connected, the pipe canopy deviates from the one end of hard rock stratum is inserted and is located in the U type portion, the periphery wall of pipe canopy supports the top on the internal perisporium of U type portion.
9. The method for treating the soft collapse zone in tunnel excavation according to claim 1, wherein: after the intensity of cement paste injected into the soft stratum tunnel face reaches the predicted intensity and is excavated by adopting an annular step method or a CD method, the method further comprises the following steps:
after a preset distance is excavated, an arch center is erected, and the distance between every two adjacent arch centers is 40cm-50 cm.
10. The method for treating the soft collapse zone in tunnel excavation according to claim 2, wherein: a preset angle is clamped between the central axis of the pipe shed and the horizontal plane, and the preset angle ranges from 1 degree to 2 degrees.
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| CN110067573A (en) * | 2019-04-26 | 2019-07-30 | 西和县中宝矿业有限公司 | A kind of quick improvement and the construction method for passing through the crushed zone that caved in |
| CN110608056A (en) * | 2019-09-29 | 2019-12-24 | 中铁二局集团有限公司 | Method for treating tunnel collapse of water-rich fault zone |
| CN112127899A (en) * | 2020-09-28 | 2020-12-25 | 中电建十一局工程有限公司 | Conglomerate stratum tunnel arch ring consolidation grouting method |
| CN112282793A (en) * | 2020-10-10 | 2021-01-29 | 刘前林 | Soft rock tunnel face collapse treatment method |
| CN112228082A (en) * | 2020-10-29 | 2021-01-15 | 中铁一局集团有限公司 | Tunnel collapse treatment method by combined grouting of pipe shed and advanced small guide pipe |
| KR102265581B1 (en) * | 2021-03-25 | 2021-06-16 | 컨텍이앤씨 주식회사 | Filling Method for grouting into Rear cavity of Tunnel |
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Application publication date: 20211228 |