CN107013228B - A kind of prominent mud rear arch top Rock Surrounding The Cavity reconstruction method of large cross-section tunnel water burst - Google Patents
A kind of prominent mud rear arch top Rock Surrounding The Cavity reconstruction method of large cross-section tunnel water burst Download PDFInfo
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- CN107013228B CN107013228B CN201710314957.7A CN201710314957A CN107013228B CN 107013228 B CN107013228 B CN 107013228B CN 201710314957 A CN201710314957 A CN 201710314957A CN 107013228 B CN107013228 B CN 107013228B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000011435 rock Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000004567 concrete Substances 0.000 claims description 40
- 239000000523 sample Substances 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 17
- 238000005553 drilling Methods 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000010412 perfusion Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000007580 dry-mixing Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 239000011378 shotcrete Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000012790 confirmation Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 3
- 230000000454 anti-cipatory effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 abstract 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a kind of prominent mud rear arch top Rock Surrounding The Cavity reconstruction methods of large cross-section tunnel water burst, this method is primarily directed to large cross-section tunnel engineering, it is reproduced by country rock, dashing forward water burst, tunnel vault caused by mud collapses, country rock is fragmentary, the larger unstability in country rock gap is transformed control, form the integration of tunnel vault country rock, accelerate the prominent mud punishment of Tunnel Gushing, reduces investment and loss, while eliminating Partial security hidden danger.Country rock reconstruction method not only increases the punishment efficiency of the prominent mud of Tunnel Gushing, while ensuring the stability of tunnel surrounding, reduces the probability of the prominent mud of secondary water burst, and technical security is reliable.After carrying out coordinate detection analysis to tunnel arch cavity, reasonable method is selected to carry out country rock reconstruction, tunnel arch country rock is set to become whole unification from fragmentary, empty, it reduces underground water water burst prominent mud position in tunnel arch is continued to destroy erosion, increase the handful shield effect of steel tube shed simultaneously, sinking and the convergent deformation for reducing country rock, improve construction speed.
Description
Technical field
The present invention relates to the prominent mud rear arch top Rock Surrounding The Cavity reconstruction techniques of highway tunnel with large cross section water burst, belong to large cross-section tunnel
Technical field of construction.
Background technique
China's rapid development of economy brings volume of traffic sharp increase, the policy of " development of the West Regions " and the Belt and Road, shape
Highway demand is increasingly urgent at southwest.With the rapid growth of local economy, more and more highways
Design is changed to " two-way six-lane " from " two-way four-lane ", that is, " unidirectional three lanes ".Especially three lanes highway
Construction so that tunnel excavation width has been reached 17.2m, can reach 20.5m at widened section.In Yunnan-Guizhou Plateau karst landform
Under complex geological condition, the increase of tunnel width brings the risk of the prominent mud of bigger water burst, vault collapsing.This method relies on
Kunming belt freeway In The Southeast Section Yang Lin constructing tunnel, according in the prominent mud punishment of Yang Lin Tunnel Gushing, vault collapses, vault is empty
Chamber is discharged the new method that continuous, steel tube shed slip casting is developed in the case where can not carrying out.Big cross section buried for karst area
Tunnel Gushing is dashed forward in mud punishment construction, how to block prominent mud mouth and prominent mud mouth upper cavity carries out country rock to reproduce being in weight difficult point
Hold, directly determines the cost etc. of the machinery, investment that use.Currently, domestic generally use steel tube shed note to water burst mud punishment of dashing forward
The method of slurry cooperation grouting with small pipe, after this method is primarily adapted for use in prominent mud, water hydraulic pressure is small, and subsequent geology is stablized, secondary prominent
The small geology of mud possibility, first is that not being available steel tube shed in the prominent mud in vault side, sets insufficient space for this method,
Second is that can not in subsequent water yield and larger hydraulic pressure can not slip casting block, so that country rock unstable factor can not be eliminated.Therefore,
Often because of construction wrong, secondary water burst is caused to be dashed forward mud, to cause greater loss.
In the buried large cross-section tunnel construction of karst landform, the prominent mud of water burst belongs to the geologic hazard type of more difficult prevention, calamity
Evil is punished particularly important using the time which kind of method reduces loss and investment caused by disaster, reduction disaster influences after occurring.
Once prominent mud Treatment Methods using improper, will easily cause secondary water burst dash forward mud, to the increase for bringing punishment to put into, build work
The adverse consequences such as the extension of phase.Mud Rock Surrounding The Cavity reconstruction method practical value with higher and important society so research water burst is dashed forward
It can meaning.
Usually effect is undesirable for conventional mud Treatment Methods prominent for larger water burst, punishes long in time limit, low efficiency, investment
It is high, influenced by factors narrow etc. in Tunnel it is more.Based on above-mentioned analysis, the prominent mud Treatment Methods of new water burst are developed --- it encloses
Rock reproduces method.
Summary of the invention
The technical solution adopted by the present invention to solve the technical problems is a kind of prominent mud rear arch head space of large cross-section tunnel water burst
Chamber country rock reconstruction method, the specific implementation of this method are as follows:
1) the prominent mud position situation analysis of water burst
Tunnel arch water burst is dashed forward after mud disaster occurs, by carrying out to the water burst prominent mud flooder of mud generating process and scene of dashing forward
It checks, carries out comprehensive analysis in conjunction with the geologic information that Tunnel Design provides, formulate the initial stage scheme of the prominent mud punishment of water burst.Initial stage
Treatment Scheme is not collapse vault grouting and reinforcing and prominent mud gushes the cleaning of quarrel body, reinforces to impacted, consolidate impacted vault and
Slag body does not collapse, at the same to gush quarrel object carry out observation analysis, conducive to next step formulate to gush at quarrel carry out Treatment Scheme.?
Cleaning gushes quarrel at prominent 15-10 meters of the mud position position of water burst, should stop punishing, be done again in next step after forward probe
It controls.
1.1 three-dimensional advance geologic prediction detection analysis
Due to vault water burst dash forward mud collapsing mostly occur under IV grade, V grades of wall rock geologies, by two serve as a contrast away from face distance compared with
Closely, the factors such as mud filling barrel of dashing forward influence, and the first Zhi Changdu only deposited can hardly meet using forward probe requirement, therefore can only
Using geological radar forward probe.When being cleaned to away from gushing at mud at 15~10 meters, different angle is carried out using geological radar
Forward probe carries out advanced prediction analysis, the ground at the prominent mud position of confirmation front water burst using the means of three-dimensional geological anticipatory analysis
Matter situation, whether there is or not gush cavity is formed at quarrel mouth top, the position of cavity, form and volume have water content size in much, cavity,
Directly affected tunnel paragraph have how long, complete country rock position.
1.2 advance geologic inspecting hole forecast analysis
According to three-dimensional advance geologic prediction as a result, setting advanced inspecting hole using crawler type geological drilling rig, to front country rock and
Face top carries out bore detecting.During setting advanced inspecting hole, penetration rate is recorded in detail, retains and bores quarrel quarrel
Sample, drill water yield, whether there is or not empty data are encountered, to check advance geologic prediction.Especially for gush the water body on top at quarrel,
Cavity carry out bore detecting, while the inspecting hole as next step country rock reconstruction when relief hole.After gushing quarrel because of mud of dashing forward, mud mouth meeting of dashing forward
It is cut and blocks by mud, unsmooth due to sluicing, cavity can be gradually filled with water, reflected in three-dimensional forward probe achievement to be
Cavity water body, it is therefore desirable to further bore detecting confirmation.It is super in conjunction with three-dimensional geological after drilling confirmed cavity size position
Preceding forecast carries out comprehensive analysis, to formulate next step country rock reconstruction scheme.For cavity bore detecting, according to live real space
Situation drills in any angle, it should be noted that this inspecting hole should be at 3 meters of cavity bottom or more positions and be preferred, this inspecting hole
It is used in country rock reconstruction as relief hole.Due to along tunnel direction of advance without drilling operation space, then with tunnel advance side
This relief hole has been set to the angle of 30 ° of angles to cavity.
2) Rock Surrounding The Cavity reconstruction method
After advance geologic prediction comprehensive analysis, the Position Approximate and shape, size of cavity are confirmed.Therefore country rock is carried out
Reconstruction, carries out repairing reconstruction to loose wall rock and cavity.
2.1 set country rock pore-creating again
According to advanced prediction detection analysis as a result, setting a country rock pore-creating again again in a upper exploration hole lower part.This is again
Pore-creating need to be set when setting according to designed position, angle, and drilling should pierce 1 meter of position more than cavity bottom, be pierced
Afterwards, it after cavity size to be confirmed, is drilled using steel sleeve is sent into tube method, and go deep into cavity 50cm.When setting reconstruction hole,
It should be noted the size of observation water yield, after cavity pressure release inspecting hole sluicing pressure release, then the hydraulic pressure of pore-creating is not too big, gushes at mud mouth
Water discharged amount can also be reduced, and pay attention to observing water yield, judge groundwater run off supplement speed and size in cavity, again for next step country rock
Offer scheme foundation is provided.
2.2 carry out country rock reconstruction
When will again pore-creating set complete 108 steel pipe of Φ after, prepare country rock reconstruction, country rock reconstruction be carried out in two steps.
First step jet pouring dry mixing fiber concrete.
Dry method shotcreting machine is connected with 108 steel pipe of Φ by injection pipe, is then led to high-pressure blast 5~10 minutes, to blow
The net underground water into injection pipe, observes that top relief hole has aqueous vapor ejection at this time, if anhydrous gas blowout goes out, needs first to dredge
Relief hole once keeps its unimpeded.The uniform gunite concrete of dry mixing is transported to scene, is added in dry spraying machine, this concrete
Tunnel just branch C25 fiber concrete can be used, match ratio are as follows: cement (P.O42.5R): sand: microlith: polypropylene fibre=
464:863:863:1, cement use high-early (strength) cement, and accelerator uses pulvis, and the thin not super 25mm of cobble-stone diameter maximum particle diameter is spraying
When penetrating perfusion, accelerator pulvis is uniformly added by the 8% of cement content in pulp shooting machine feeding port.Injection dry-mix concrete enters sky
Yong Nikou cavity bottom is largely fallen by rebound after chamber, after water impregnates mixing, under the action of accelerator, fiber coagulation
Soil can quick solidification, water burst mud mouth of dashing forward is blocked.Perfusion total amount should detect according to weather report achievement and be calculated, and control in thickness
It spends between 0.5~0.8m, 2~4m is perfused3Be advisable, also can be observed face gush quarrel accumulation body have cement slurry outflow, wait flow out 5
~stop perfusion, gunite concrete 2.5m after ten minutes3Stop injection afterwards.After concrete stop-spraying, high-pressure blast should continue at least 5 points
Clock prevents dry shotcreting from flowing backward plugging to empty the concrete in intrusion pipe.
Second step pouring underwater concrete.
The pump line of concrete pump is connected using crossover sub with reconstruction hole steel pipe, the underwater coagulation that will be stirred
Soil continues to convey into cavity.The concrete strength uses C30, match ratio are as follows: cement (P.O42.5R): sand: stone: water: subtracts
Aqua=427:769:1019:185:4.27.It is to be seen when there is concrete outflow to relief hole, terminate pumping, and close again
Pore-creating pipe fitting prevents concrete reflux from releasing.Observe that front face gushes water yield in quarrel body and is greatly decreased at this time, part
Underground water is flowed out by relief hole, illustrates that country rock reproduces successfully.
Compared with prior art, this method has the advantages that.
1, it is reproduced by country rock, dashing forward water burst, tunnel vault caused by mud collapses, country rock is fragmentary, the larger unstability in country rock gap
It is transformed control, forms the integration of tunnel vault country rock, accelerates the prominent mud punishment of Tunnel Gushing, reduces investment and loss, simultaneously
Eliminate Partial security hidden danger.Country rock reconstruction method not only increases the punishment efficiency of the prominent mud of Tunnel Gushing, while ensuring tunnel
The stability of country rock, reduces the probability of the prominent mud of secondary water burst, and technical security is reliable.
2, this method by Tunnel Gushing dash forward mud position carry out three-dimensional geological detection combine bore detecting, by analysis,
Cavity size, position caused by the prominent mud of tunnel arch water burst are obtained, provides foundation for reproducing country rock construction in next step.
3, the cavity formed for the prominent mud of tunnel arch water burst, traditional Treatment Methods low efficiency, the undesirable feature of effect,
Method is reproduced using simple, practical country rock.In contrast, this method is high-efficient, at low cost, and controllability is good, safe and practical.
4, it after by carrying out coordinate detection analysis to tunnel arch cavity, selects reasonable method to carry out country rock reconstruction, makes
Tunnel arch country rock becomes whole unification from fragmentary, empty, reduces underground water and continues to destroy to the prominent mud position of tunnel arch water burst
It corrodes, while increasing the handful shield effect of steel tube shed, reduce sinking and the convergent deformation of country rock.It is narrow to tunnel space to set
The tunnel location of steel tube shed can directly be set ductule and can punished and passed through after the method, to the excavation in next step tunnel
Construction forms security protection, improves construction speed.
Detailed description of the invention
Fig. 1 relief hole, again pore-creating and 30 ° of schematic diagrames of line level angle.
Fig. 2 is that tunnel gushes mud Rock Surrounding The Cavity reconstruction schematic diagram.
Fig. 3 is schematic diagram after the reconstruction of tunnel Rock Surrounding The Cavity.
Specific embodiment
The technical solution adopted by the present invention to solve the technical problems is:
1) the prominent mud position situation analysis of water burst
Tunnel arch water burst is dashed forward after mud disaster occurs, by carrying out to the water burst prominent mud flooder of mud generating process and scene of dashing forward
It checks, carries out comprehensive analysis in conjunction with the geologic information that Tunnel Design provides, the initial stage scheme of the prominent mud punishment of water burst can be formulated.One
As initial stage Treatment Scheme be not collapse vault grouting and reinforcing and prominent mud gushes the cleaning of quarrel body, reinforces to impacted, consolidate impacted
Vault and slag body do not collapse, while carrying out observation analysis to quarrel object is gushed, and formulate conducive to next step and are punished at quarrel to gushing
Scheme.Quarrel is gushed at prominent 15-10 meters of the mud position position of water burst in cleaning, should be stopped punishing, be done down again after forward probe
The punishment of one step.This is primarily due to front and collapses in confused situation at prominent mud, cannot take measures rashly, although from the clear quarrel of early period
A small amount of information can be obtained with water outlet, but details also needs to carry out detection analysis.
1.1 three-dimensional advance geologic prediction detection analysis
Due to vault water burst dash forward mud collapsing mostly occur under IV grade, V grades of wall rock geologies, by two serve as a contrast away from face distance compared with
Closely, mud filling barrel etc. factors of dashing forward influence, and the first Zhi Changdu only deposited can hardly meet using TSP203 forward probe requirement, because
This can only use geological radar forward probe.China uses low frequency geological radar more at present, and complicated geology rich water breaking surrounding rock has
Effect investigation depth only has 20 meters or so, 30 meters most deep.Therefore, when being cleaned to away from gushing at mud at 15~10 meters, geology can be used
Radar carries out the forward probe of different angle, advanced prediction analysis is carried out using the means of three-dimensional geological anticipatory analysis, before confirmation
Fang Yongshui dashes forward the geological condition at mud position, whether there is or not gush quarrel mouth top form cavity, the position of cavity, form and volume have it is more
Greatly, water content size in cavity, directly affected tunnel paragraph have how long, complete country rock position etc..
1.2 advance geologic inspecting hole forecast analysis
According to three-dimensional advance geologic prediction as a result, setting advanced inspecting hole using crawler type geological drilling rig, to front country rock and
Face top carries out bore detecting.During setting advanced inspecting hole, penetration rate is recorded in detail, retains and bores quarrel quarrel
Sample, drill water yield, whether there is or not the data such as cavity are encountered, to check advance geologic prediction.Especially for the water for gushing top at quarrel
Body, cavity carry out bore detecting, while the inspecting hole can be used as relief hole when next step country rock reproduces.After gushing quarrel because of mud of dashing forward, dash forward
Mud mouth can be cut by mud and block, and unsmooth due to sluicing, cavity can be gradually filled with water, and be embodied in three-dimensional forward probe achievement
Only cavity water body, it is therefore desirable to further bore detecting confirmation.After drilling confirmed cavity size position, in combination with three
It ties up Geological Advanced Prediction and carries out comprehensive analysis, to formulate next step country rock reconstruction scheme.It, can basis for cavity bore detecting
Live real space situation drills in any angle, it should be noted that this inspecting hole should be at 3 meters of cavity bottom with upper
It is set to good, this inspecting hole is used when country rock is reproduced as relief hole.In the present case, since suitable tunnel direction of advance is without drilling operation
Space has then set this relief hole to cavity with the angle with 30 ° of angles of tunnel direction of advance.
2) Rock Surrounding The Cavity reconstruction method
After advance geologic prediction comprehensive analysis, the Position Approximate and shape, size of cavity can be confirmed.It therefore can be with
Country rock reconstruction is carried out, repairing reconstruction is carried out to loose wall rock and cavity.
2.1 set country rock pore-creating again
According to advanced prediction detection analysis as a result, setting a country rock pore-creating again, position again in a upper exploration hole lower part
It is illustrated in fig. 3 shown below.This need to set when pore-creating is set again according to designed position, angle, and drilling should be 1 meter more than cavity bottom
Position pierce, after piercing, after cavity size to be confirmed, can be used to be sent into steel sleeve with tube method and drill, and go deep into cavity
50cm.When setting reconstruction hole, the size of observation water yield should be noted, under normal circumstances, in cavity pressure release inspecting hole sluicing pressure release
Afterwards, then the hydraulic pressure of pore-creating is not too big, meanwhile, gushing water discharged amount at mud mouth can also be reduced, and pay attention to observing water yield, it can be determined that empty
Intracavitary groundwater run off supplement speed and size provide scheme foundation for the reconstruction of next step country rock.
2.2 carry out country rock reconstruction
When will again pore-creating set complete 108 steel pipe of Φ after, so that it may prepare country rock and reproduce, country rock reconstruction in two steps into
Row.
First step jet pouring dry mixing fiber concrete.
Dry method shotcreting machine is connected with 108 steel pipe of Φ by injection pipe, is then led to high-pressure blast 5~10 minutes, to blow
The net underground water into injection pipe, if anhydrous gas blowout goes out, needs elder generation at this time it can be observed that top relief hole has aqueous vapor ejection
Relief hole is dredged, keeps its unimpeded.The uniform gunite concrete of dry mixing is transported to scene, is added in dry spraying machine, this is mixed
Tunnel just branch C25 fiber concrete can be used in solidifying soil, match ratio are as follows: cement (P.O42.5R): sand: microlith: polypropylene fibre
=464:863:863:1, cement use high-early (strength) cement, accelerator use pulvis, the thin not super 25mm of cobble-stone diameter maximum particle diameter,
When jet pouring, accelerator pulvis is uniformly added by the 8% of cement content in pulp shooting machine feeding port.Dry-mix concrete is sprayed to enter
Yong Nikou cavity bottom is largely fallen by rebound after cavity, after water impregnates mixing, under the action of accelerator, fiber is mixed
Solidifying soil can quick solidification, water burst mud mouth of dashing forward is blocked.Perfusion total amount should detect according to weather report achievement and be calculated, and control exists
Between 0.5~0.8m of thickness, generally 2~4m of perfusion3Be advisable, also can be observed face gush quarrel accumulation body have cement slurry outflow,
Wait flow out 5~stopping perfusion after ten minutes, in the present case, gunite concrete 2.5m3Stop injection afterwards.It is high after concrete stop-spraying
Pressure wind should continue at least 5 minutes, to empty the concrete in intrusion pipe, prevent dry shotcreting from flowing backward plugging.
Second step pouring underwater concrete.
The pump line of concrete pump is connected using crossover sub with reconstruction hole steel pipe, the underwater coagulation that will be stirred
Soil continues to convey into cavity.The concrete strength uses C30, match ratio are as follows: cement (P.O42.5R): sand: stone: water: subtracts
Aqua=427:769:1019:185:4.27.It is to be seen when there is concrete outflow to relief hole, terminate pumping, and close again
Pore-creating pipe fitting prevents concrete reflux from releasing.At this time it can be observed that front face gush quarrel body in water yield be greatly decreased,
Part underground water is flowed out by relief hole, illustrates that country rock reproduces successfully.
Claims (1)
- A kind of mud rear arch top Rock Surrounding The Cavity reconstruction method 1. large cross-section tunnel water burst is dashed forward, it is characterised in that: the specific reality of this method It applies as follows:1) the prominent mud position situation analysis of water burstTunnel arch water burst is dashed forward after mud disaster occurs, by looking into the water burst prominent mud flooder of mud generating process and scene of dashing forward It sees, carries out comprehensive analysis in conjunction with the geologic information that Tunnel Design provides, formulate the initial stage scheme of the prominent mud punishment of water burst；At initial stage It controls scheme and is and do not collapse vault grouting and reinforcing and prominent mud gushes the cleaning of quarrel body, reinforces to impacted, consolidate impacted vault and slag Body does not collapse, at the same to gush quarrel object carry out observation analysis, conducive to next step formulate to gush at quarrel carry out Treatment Scheme；Clear Reason gushes quarrel at prominent 15-10 meters of the mud position position of water burst, should stop punishing, punish again after forward probe；1.1 three-dimensional advance geologic prediction detection analysisSince the prominent mud collapsing of vault water burst mostly occurs under IV grades, V grades of wall rock geologies, it is closer, is dashed forward away from face by two linings Mud, which clogs barrel factor, to be influenced, and the first Zhi Changdu only deposited is not able to satisfy using forward probe requirement, therefore can only use geology thunder Up to forward probe；When being cleaned to away from gushing at mud at 15~10 meters, the forward probe of different angle is carried out using geological radar, is adopted Advanced prediction analysis is carried out with the means of three-dimensional geological anticipatory analysis, confirms the geological condition at the prominent mud position of front water burst, whether there is or not Cavity is formed at quarrel mouth top, the position of cavity, form and volume have water content size in much, cavity, are directly affected gushing Tunnel paragraph have how long, complete country rock position；1.2 advance geologic inspecting hole forecast analysisAccording to three-dimensional advance geologic prediction as a result, setting advanced inspecting hole using crawler type geological drilling rig, to front country rock and area Face top carries out bore detecting；During setting advanced inspecting hole, penetration rate is recorded in detail, retains and bores quarrel quarrel sample, is bored Hole water yield, whether there is or not empty data are encountered, to check advance geologic prediction；It is bored for the water body on top, cavity at quarrel is gushed Hole detection, while the inspecting hole as next step country rock reconstruction when relief hole；After gushing quarrel because of mud of dashing forward, mud mouth of dashing forward can be cut stifled by mud Plug, unsmooth due to sluicing, cavity can be gradually filled with water, the reflected only cavity water in three-dimensional forward probe achievement Body, it is therefore desirable to further bore detecting confirmation；After drilling confirmed cavity size position, in conjunction with three-dimensional geological advanced prediction Comprehensive analysis is carried out, to formulate next step country rock reconstruction scheme；For cavity bore detecting, existed according to live real space situation Any angle drills, it should be noted that this inspecting hole should be at 3 meters of cavity bottom or more positions, this inspecting hole is reproduced in country rock Shi Zuowei relief hole uses；Due to along tunnel direction of advance without drilling operation space, then with 30 ° of angles of tunnel direction of advance Angle has set this relief hole to cavity；2) Rock Surrounding The Cavity reconstruction methodAfter advance geologic prediction comprehensive analysis, the Position Approximate and shape, size of cavity are confirmed；Therefore country rock is carried out again It makes, repairing reconstruction is carried out to loose wall rock and cavity；2.1 set country rock pore-creating againAccording to advanced prediction detection analysis as a result, setting a country rock pore-creating again again in a upper exploration hole lower part；The pore-creating again It need to be set according to designed position, angle when setting, drilling should pierce 1 meter of position more than cavity bottom, after piercing, to After confirming cavity size, drilled using steel sleeve is sent into tube method, and go deep into cavity 50cm；When setting reconstruction hole, need to infuse The size of meaning observation water yield, after cavity pressure release inspecting hole sluicing pressure release, then the hydraulic pressure of pore-creating is not too big, gushes and sluices at mud mouth Amount can also be reduced, and pay attention to observing water yield, judged groundwater run off supplement speed and size in cavity, mentioned for the reconstruction of next step country rock For scheme foundation；2.2 carry out country rock reconstructionWhen will again pore-creating set complete 108 steel pipe of Φ after, prepare country rock reconstruction, country rock reconstruction be carried out in two steps；First step jet pouring dry mixing fiber concrete；Dry method shotcreting machine is connected with 108 steel pipe of Φ by injection pipe, high-pressure blast 5~10 minutes is then led to, with blow off into Enter the underground water in injection pipe, observe that top relief hole has aqueous vapor ejection at this time, if anhydrous gas blowout goes out, needs first to dredge Relief hole keeps its unimpeded；The uniform gunite concrete of dry mixing is transported to scene, is added in dry spraying machine, this concrete can be adopted Branch C25 fiber concrete, match ratio at the beginning of tunnel are as follows: cement: sand: microlith: polypropylene fibre=464:863:863:1, water Mud use high-early (strength) cement, accelerator use pulvis, the thin not super 25mm of cobble-stone diameter maximum particle diameter, in jet pouring, accelerator Pulvis is uniformly added by the 8% of cement content in pulp shooting machine feeding port；Injection dry-mix concrete enters after cavity by rebounding greatly Part falls into Yong Nikou cavity bottom, after water impregnates mixing, under the action of accelerator, and fiber concrete meeting quick solidification, Water burst mud mouth of dashing forward is blocked；Perfusion total amount should detect according to weather report achievement and be calculated, control 0.5~0.8m of thickness it Between, 2~4m is perfused3, face also can be observed gush quarrel accumulation body to have cement slurry outflow, wait flow out 5~stop filling after ten minutes Note, gunite concrete 2.5m3Stop injection afterwards；After concrete stop-spraying, high-pressure blast should continue at least 5 minutes, to empty intrusion pipe Interior concrete prevents dry shotcreting from flowing backward plugging；Second step pouring underwater concrete；The pump line of concrete pump is connected using crossover sub with reconstruction hole steel pipe, the underwater concrete being stirred is held Continue and is conveyed into cavity；The concrete strength uses C30, match ratio are as follows: cement: sand: stone: water: water-reducing agent=427:769: 1019:185:4.27；It is to be seen to terminate pumping when there is concrete outflow to relief hole, and reconstruction hole pipe fitting is closed, it prevents Concrete reflux is released；Observe that front face gushes water yield in quarrel body and is greatly decreased at this time, part underground water passes through pressure release Hole outflow, illustrates that country rock reproduces successfully.
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| CN108492030B (en) * | 2018-03-22 | 2019-05-03 | 广西信达高速公路有限公司 | A method of estimation deep tunnel face outburst is prominent to gush calamity danger degree |
| CN108536927B (en) * | 2018-03-22 | 2019-01-29 | 广西信达高速公路有限公司 | A method of estimation deep tunnel equivalent cross-section is prominent to gush disaster earthquake intensity |
| CN112627832B (en) * | 2020-12-18 | 2022-10-11 | 广西交通设计集团有限公司 | Method for integrating detection, treatment and monitoring operation and maintenance of water inrush and mud inrush of karst tunnel |
| CN112709585B (en) * | 2020-12-30 | 2022-06-07 | 山东交通学院 | Blocking device and method for preventing mud outburst and water inrush of tunnel |
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