CN108222948A - A kind of traversing shallow-buried Faults in Tunnels Construction of Transition Section method - Google Patents
A kind of traversing shallow-buried Faults in Tunnels Construction of Transition Section method Download PDFInfo
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- CN108222948A CN108222948A CN201711480063.1A CN201711480063A CN108222948A CN 108222948 A CN108222948 A CN 108222948A CN 201711480063 A CN201711480063 A CN 201711480063A CN 108222948 A CN108222948 A CN 108222948A
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000007704 transition Effects 0.000 title claims abstract description 8
- 238000003325 tomography Methods 0.000 claims abstract description 23
- 238000007596 consolidation process Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 5
- 238000005553 drilling Methods 0.000 claims description 32
- 238000007569 slipcasting Methods 0.000 claims description 25
- 230000000694 effects Effects 0.000 claims description 17
- 238000007689 inspection Methods 0.000 claims description 17
- 238000012795 verification Methods 0.000 claims description 17
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 238000009412 basement excavation Methods 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000004411 aluminium Substances 0.000 claims description 8
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 8
- 230000011218 segmentation Effects 0.000 claims description 7
- 238000005728 strengthening Methods 0.000 claims description 6
- 230000005641 tunneling Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 241000256135 Chironomus thummi Species 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 3
- PPTYJKAXVCCBDU-UHFFFAOYSA-N Rohypnol Chemical compound N=1CC(=O)N(C)C2=CC=C([N+]([O-])=O)C=C2C=1C1=CC=CC=C1F PPTYJKAXVCCBDU-UHFFFAOYSA-N 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 3
- 230000010339 dilation Effects 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 238000005098 hot rolling Methods 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 230000008595 infiltration Effects 0.000 claims 1
- 230000009191 jumping Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 238000004062 sedimentation Methods 0.000 abstract description 6
- 239000011435 rock Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 206010016256 fatigue Diseases 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention provides a kind of traversing shallow-buried Faults in Tunnels Construction of Transition Section method, by curtain-grouting to formation consolidation, changes mechanical property, improves intensity and globality；Steel tube shed overlaps soft or hard stratum and forms it into entirety in hole, and the effective rigidity for increasing the soil body improves shear resistance, can effectively inhibit sedimentation and deformation when passing through tomography interface.To solve using this geology of the similar chael-de-fer mountain tunnel F2 tomographies of existing method construction and orographic condition, construction risk is excessive, the uncontrollable problem of risk.The invention belongs to technical field of tunnel construction.
Description
Technical field
The present invention relates to a kind of construction methods of traversing shallow-buried Faults in Tunnels changeover portion, belong to constructing tunnel field.
Background technology
Your railway Weixin County is crossed into Yunnan Province is domestic behind Sichuan Province Leshan, approach Yibin City into, it is expensive entering
State province Bijie City, to the east of Guiyang, positive line length 515.02km is western high-speed railway main line, is known as " the first in the world item
Mountainous high speed railway ".
Tunnel the beginning and the end mileage in chael-de-fer mountain is：D4K466+785~DK472+012, overall length 5227m.III grade of country rock of full tunnel
980m, IV grade of country rock 2075m, V grade of country rock 2120m, it is 80.3% that IV, V grade of country rock, which accounts for tunnel overall length,.By geological structure shadow
It ringing, 4 fault belt line influence length 1450m of Tunnel Passing account for tunnel overall length 27.7%, and mud water burst risk of dashing forward is high,
It is into one of 6 I grades of risk tunnels of your railway and weighs one of difficult point Tunnel Engineering into 13 that your railway is drafted.
Formation lithology is disclosed according to drilling, specifies tomography changeover portion reinforcing scope at D4K467+140~D4K467+168 sections
Common 28m, 30 °~40 ° of shallow tunnel tomography changeover portion tomography interface dip, the soft or hard unevenness of geology, fault breccia, fault gouge etc.
Lithology shearing strength is low, meets water softening, without self-stable ability, and edpth of tunnel 11m~17m, topography is low smooth, and earth's surface gathering ground is wide, knot
Periphery orographic condition (wearing builder's road under barrel) is closed, construction risk is high.At present, tomography transition is passed through in shallow tunnel by the country
In the construction of section, long pipe shed leading pre-supporting in more using, similar chael-de-fer mountain tunnel F2 tomographies disclose geologic lithology and landform item
Construction case row under part are extremely rare, almost without the construction method for reference, construction risk how to be made controllably to become construction
The a great problem of technical staff.
Invention content
It is an object of the invention to：A kind of traversing shallow-buried Faults in Tunnels Construction of Transition Section method is provided, to solve using existing
There are this geology of the similar chael-de-fer mountain tunnel F2 tomographies of method construction and orographic condition, construction risk is excessive, and risk is uncontrollable to ask
Topic.
To solve the above problems, intend using such a traversing shallow-buried Faults in Tunnels Construction of Transition Section method, specific steps
It is as follows：
Step 1 accurately judges tomography interface by horizontal geotechnical boring, specifies changeover portion reinforcing scope；
Step 2 applies grouting test, specifies the midge ability and grouting parameter on stratum；
Step 3 curtain-groutings using segmentation protrusive tunneling boring complete opening slip casting, are segmented protrusive bored grouting energy subregion
Segmentation, preferably ensures drilling construction and slip casting effect, grouting sequence ecto-entad, from down to up, interval jump hole and apply, be convenient for
Control grout mixing, it is ensured that slip casting effect, injecting paste material are used based on sulphate aluminium cement, and ordinary cement single slurry is
Auxiliary, equably consolidation filling formation void, water rich strata curtain-grouting outer ring form rigid seal ring using sulphate aluminium cement,
And effective water barrier is formed on the outside of excavation contour line, inner ring fills consolidating stratum using Portland cement；
Step 4 daguanpeng constructions can preferably inhibit the sedimentation and deformation in digging process, will by design using total powerstation
It asks and makes drilling hole position, in boring procedure, carry out borehole log, geologic description is carried out to drilling, takes complete opening grouting process,
Grouting sequence from down to up, interval jump hole and perform, steel tube shed can effectively increase the rigidity of the soil body in hole, improve shear resistance,
It can effectively inhibit sedimentation and deformation when passing through tomography interface.By above-mentioned pre-add solid method, a certain range stratum around barrel
Physical and mechanical properties be changed, the self of excavation face significantly improves, and construction risk is made controllably to become a reality.
It needs to carry out pre-reinforcement compliance test result after step 4, after slip casting pre-reinforcement, consolidation effect is verified,
Verification method is as follows：
1. verification is imaged in drilling, hole
In the weak link during slip casting and hole count ratio, multiple inspection holes are set, judge that slip casting adds by inspection hole
Gu effect；
2. excavate verification
It after completing first step verification, is finally verified by the excavation most put into practice, using reserved core when excavating for the first time
The native short drilling depth method of annular, recycles by number and excavates verification, judge consolidation effect.
In the first step verification of aforementioned pre-reinforcement compliance test result, in inspection hole drilling process, drilling speed is stablized, and sound is dull,
Without advancing by leaps and bounds, boring mud is uniform, and for flushing liquor into taupe, inspection hole pore-forming is preferable, just sentences pre-reinforcement effect ideal；It is put in inspection hole
Enter imager in hole, picture in inspection hole is presented on video reception apparatus by the camera of imager front end, manually will camera shooting
Head is slowly sent from aperture to bottom hole, can clearly be seen hole wall slurries filling operation, whether be whether there is collapse hole shrinkage cavity and ooze
Phenomena such as water, shows that judgement grouting and reinforcing achieves the desired results by video data.
In step 1, indulged using geological drilling rig in face by the position and angular hole-boring that set according to borehole log
To with plane Geo logical layout, indicate geologic lithology, fitting specifies strengthening length into tomography interface；
In step 3, according to curtain-grouting strengthening length, tunneling boring pre-grouting reinforcing scope is the outer 5m of excavation contour line,
Dilation angle is 2m, sets 2 whole pore cross sections altogether, designs 52 holes in total, injecting paste material uses based on sulphate aluminium cement, commonly
Supplemented by cement single slurry, the ratio of mud 0.8~1 of cement mortar:1；
It demarcates hole position to determine after creeping into outer limb, is crept into using Φ 130mm drill bit low speed to 2.0m, install orifice tube；Hole
Mouth pipe, which installs completion front end, must install high pressure sluice valve, and drilling construction is carried out by high pressure sluice valve；Principle is every during inlet well
Slip casting plug is installed after the secondary deep 5~10m of brill and carries out mortar depositing construction, after this section of slip casting reaches design ending standard, removes slip casting
Plug creeps into 5~10m again on foramen primum deep foundation, and slip casting is to design standard, then drills, and so cycle is deep to design until boring note
Degree.
In step 4, pipe canopy uses outer diameter Φ 89mm, hot rolled seamless steel tube processing, often saves long 3~4m, and along tube wall two
Perpendicular diameter is drilled with four row's Φ 8mm extravasating holes, quincunx laying, and pitch of holes 30cm often saves the lined pipe welding of pipe canopy, every pipe
It is processed into tip, prong length 15cm in canopy front end.
Basic principle:Tomography changeover portion line of demarcation is specified, dividing unfavorable geology needs grouting reinforcing region, passes through multi-functional drill
Machine, to stabilization zone, realizes segmentation advance tunneling boring complete opening formula curtain-grouting reinforcement by the angular hole-boring of setting；Arch sets big pipe
Canopy passes through tomography changeover portion hard-soft heterogeneous ground, and steel tube shed stress is similar to simply supported beam by curved during excavation, and steel seamless
Pipe adds grouting pipeline grouting reinforcing by curved good mechanical properties, and using pipe canopy.
Compared with prior art, the present invention is for 30 °~40 ° of shallow tunnel tomography changeover portion tomography interface dip, geology
Soft or hard unevenness, tomography lithology shearing strength is low, meet water softening, without self-stable ability the features such as, and topography is easy to the remittance of earth's surface gathering ground
Collection to realize that construction risk is controllable, provides a kind of completely new pre-add solid method, and be successfully applied to chael-de-fer mountain tunnel F2 and break
Layer earth's surface shallow embedding changeover portion.
By curtain-grouting to formation consolidation, change mechanical property, improve intensity and globality；Steel tube shed overlap joint is soft in hole
Hard formation forms it into entirety, and the effective rigidity for increasing the soil body improves shear resistance, can be effective when passing through tomography interface
Inhibit sedimentation and deformation, which has implemented through drilling, has excavated verification in hole in imaging and hole, consolidation effect well,
Construction risk is controllable, and by above-mentioned pre-add solid method, the Physical and mechanical properties on a certain range stratum are changed around barrel,
The self of excavation face significantly improves, and construction risk is made controllably to become a reality.
Means are reinforced by this kind of leading pre-supporting, excavation method in hole is realized and optimizes, the excavation method (platform after optimization
Rank method) former design gib system is eliminated, simplify working procedure；Monitoring data are tired out without significant change in digging process
Meter sedimentation and receipts test value and are less than limit value (150mm), reduce construction risk, ensure that construction safety, work progress by
Chinese Railway parent company work tube hub, into your railway Co., Ltd, into your railway Bijie headquarter, Sinorael's engineering consulting
The high evaluation of the units such as Co., Ltd and extensively praise summarize the construction pre-add solid method of formation as from now on similarly
Matter, orographic condition underground engineering construction provide reference and reference, have particularly important realistic meaning.
Description of the drawings
Fig. 1 is curtain-grouting process flow chart；
Fig. 2 is pipe roof construction process flow chart；
Fig. 3 is F2 tomographies interface skiagraph；
Fig. 4 is curtain-grouting arrangement of boring holes figure；
Fig. 5 is that curtain-grouting reinforces skiagraph；
Fig. 6 is the position view of inspection hole.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
The detailed description of step, it should be understood that specific embodiment described herein only to explain the present invention, is not used to limit this hair
It is bright.
Embodiment：
Referring to figs. 1 to Fig. 6, the present embodiment provides a kind of traversing shallow-buried Faults in Tunnels Construction of Transition Section method, specific steps
It is as follows：
Step 1 judgement tomographies interface
Tomography interface is accurately judged by horizontal geotechnical boring, changeover portion reinforcing scope is specified, is existed using geological drilling rig
Position and angular hole-boring of the face by setting, make longitudinal direction and plane Geo logical layout according to borehole log, indicate geologic lithology,
Fitting specifies strengthening length 28m into tomography interface；
Geological drilling rig is in the position that face drills and angle determination method：
1. disclosing rock stratum by design drawing combination face, geological condition is simply identified；
2. combining identified geological condition according to construction experience, horizontal drilling is carried out referring to geological condition.Carrying out this
During item work, it can constantly repeat to drill, up to investigating thoroughly fault boundary and range.Therefore, hole position and angle are all according to construction
After experience initial setting, repeat drill tasks when in constantly correct.
Step 2 applies grouting test, specifies the midge ability and grouting parameter on stratum；
Step 3 curtain-groutings
Using segmentation protrusive tunneling boring complete opening slip casting, the subregion segmentation of segmentation protrusive bored grouting energy preferably ensures
Drilling construction and slip casting effect, grouting sequence ecto-entad, from down to up, interval jump hole apply, convenient for control slurries diffusion model
It encloses, it is ensured that slip casting effect, water rich strata curtain-grouting outer ring form rigid seal ring, and take turns excavating using sulphate aluminium cement
Effective water barrier is formed on the outside of profile, inner ring fills consolidating stratum using Portland cement；
According to curtain-grouting strengthening length, tunneling boring pre-grouting reinforcing scope is the outer 5m of excavation contour line, dilation angle
For 2m, 2 whole pore cross sections being set altogether, design 52 holes in total, weak location can be considered in construction to increase injected hole, injecting paste material
Based on sulphate aluminium cement, supplemented by ordinary cement single slurry, the ratio of mud 0.8~1 of cement mortar:1；
After the determining outer limb of drilling in calibration hole position (hole position and angle at this time can be accurately designed, because
In step 1, fault boundary and range have accurately been investigated thoroughly, specify reinforcing area；The suction on stratum is specified by grouting test
The grouting parameters such as slurry ability and range of scatter；So by above-mentioned preparation, can map clear and definite curtain-grouting hole at this time
Hole position and angle, curtain-grouting hole arrangement principle：It can guarantee that the comprehensive covering of slurries needs grouting and reinforcing region, do not stay dead
Angle), using Φ 130mm drill bits low speed (according to wind pressure difference, in two kinds of situation.When being crept into using low-pressure air, low-speed range is
1m/h~1.5m/h；When being crept into using high-pressure blast, low-speed range is 20m/h~25m/h；Usually all crept into using high-pressure blast) it bores
2.0m is proceeded to, installs orifice tube；Orifice tube, which installs completion front end, must install high pressure sluice valve, and carrying out drilling by high pressure sluice valve applies
Work；Principle installs slip casting plug progress mortar depositing construction after boring deep 5~10m every time during inlet well, when this section of slip casting reaches
After designing ending standard, to remove slip casting plug and creep into 5~10m again on foramen primum deep foundation, slip casting is to design standard, then drills,
So cycle can suitably adjust brill note sector boss until boring note to projected depth according to geological condition in construction.
Step 4 daguanpeng constructions
Pipe canopy uses outer diameter Φ 89mm, hot rolled seamless steel tube processing, often saves long 3~4m, and along two perpendicular diameters of tube wall
Four row's Φ 8mm extravasating holes, quincunx laying are drilled with, pitch of holes 30cm often saves the lined pipe welding of pipe canopy, and every Guan Peng front end adds
Work is into tip, prong length 15cm.
Drilling hole position is made by design requirement using total powerstation, in boring procedure, carries out detailed borehole log, to boring
Hole carries out geologic description, takes complete opening grouting process, grouting sequence from down to up, interval jump hole and perform, can there is steel tube shed in hole
The rigidity of the increase soil body of effect, improves shear resistance, can effectively inhibit sedimentation and deformation when passing through tomography interface.By above-mentioned
Pre-add solid method, the Physical and mechanical properties on a certain range stratum are changed around barrel, and the self of excavation face is bright
It is aobvious to improve, construction risk is made controllably to become a reality.
Step 5 carries out pre-reinforcement compliance test result, after slip casting pre-reinforcement, consolidation effect is verified, authentication
Method is as follows：
1. verification is imaged in drilling, hole
In the weak link during slip casting and hole count ratio, 3 inspection holes are set, grouting and reinforcing is judged by inspection hole
Effect:
In inspection hole drilling process, drilling speed is stablized, and sound is dull, and without advancing by leaps and bounds, boring mud is uniform, and flushing liquor is examined into taupe
It is preferable to look into hole pore-forming, just sentences pre-reinforcement effect ideal；
Imager in hole is put into inspection hole, picture in inspection hole is presented on video and connect by the camera of imager front end
On receiving unit (principle is similar to human body and carries out gastrocopy), manually camera is slowly sent from aperture to bottom hole,
Phenomena such as clearly seeing hole wall slurries filling operation, whether whetheing there is collapse hole shrinkage cavity and seep water, is shown by video data, sentenced
Determine grouting and reinforcing to have achieved the desired results.
2. excavate verification
It after completing first step verification, is finally verified by the excavation most put into practice, using reserved core when excavating for the first time
The native short drilling depth method of annular, recycles by number and excavates verification, judge that consolidation effect has reached ideal effect.
Claims (6)
- A kind of 1. traversing shallow-buried Faults in Tunnels Construction of Transition Section method, which is characterized in that be as follows：Step 1 accurately judges tomography interface by horizontal geotechnical boring, specifies changeover portion reinforcing scope；Step 2 applies grouting test, specifies the midge ability and grouting parameter on stratum；Step 3 curtain-groutings, using segmentation protrusive tunneling boring complete opening slip casting, grouting sequence ecto-entad, from down to up, It is applied every jumping hole, injecting paste material is used based on sulphate aluminium cement, and supplemented by ordinary cement single slurry, equably consolidation fills stratum Gap, water rich strata curtain-grouting outer ring form rigid seal ring, and the shape on the outside of excavation contour line using sulphate aluminium cement Into effective water barrier, inner ring fills consolidating stratum using Portland cement；Step 4 daguanpeng constructions make drilling hole position by design requirement using total powerstation, in boring procedure, carry out drilling Record carries out geologic description to drilling, takes complete opening grouting process, and grouting sequence is from down to up, interval jumps hole and perform.
- 2. construction method according to claim 1, which is characterized in that it needs to carry out pre-reinforcement compliance test result after step 4, Verification method is as follows：1. verification is imaged in drilling, holeIn the weak link during slip casting and hole count ratio, multiple inspection holes are set, judge that grouting and reinforcing is imitated by inspection hole Fruit；2. excavate verificationIt after completing first step verification, is finally verified by the excavation most put into practice, remaining core soil in advance ring is used when excavating for the first time The short drilling depth method of shape recycles by number and excavates verification, judges consolidation effect.
- 3. construction method according to claim 2, which is characterized in that the specific standards and method of imaging verification in drilling, hole It is as follows：In inspection hole drilling process, drilling speed is stablized, and sound is dull, and without advancing by leaps and bounds, boring mud is uniform, and flushing liquor is into taupe, inspection hole Pore-forming is preferable, just sentences pre-reinforcement effect ideal；Imager in hole is put into inspection hole, the camera of imager front end will check Picture is presented on video reception apparatus in hole, and manually camera is slowly sent to bottom hole from aperture, can clearly be seen Whether hole wall slurries filling operation whether there is phenomena such as collapse hole shrinkage cavity and infiltration, is shown by video data, judges grouting and reinforcing It achieves the desired results.
- 4. construction method according to claim 1, it is characterised in that：In step 1, using geological drilling rig in face by setting Fixed position and angular hole-boring make longitudinal direction and plane Geo logical layout according to borehole log, indicate geologic lithology, and fitting forms disconnected Strengthening length is specified in bed boundary.
- 5. construction method according to claim 1, it is characterised in that：In step 3, according to curtain-grouting strengthening length, Quan Duan Face pre-grouting reinforcing scope is excavation contour line outer 5m, dilation angle 2m, sets 2 whole pore cross sections altogether, designs 52 in total Hole, injecting paste material is used based on sulphate aluminium cement, supplemented by ordinary cement single slurry, the ratio of mud 0.8~1 of cement mortar:1；It demarcates hole position to determine after creeping into outer limb, is crept into using Φ 130mm drill bit low speed to 2.0m, install orifice tube；Orifice tube High pressure sluice valve must be installed by installing completion front end, and drilling construction is carried out by high pressure sluice valve；Principle is bored every time during inlet well Slip casting plug is installed after deep 5~10m and carries out mortar depositing construction, after this section of slip casting reaches design ending standard, removes slip casting plug Creep into 5~10m again on foramen primum deep foundation, slip casting is to design standard, then drills, and so cycle is until boring note to projected depth.
- 6. construction method according to claim 1, it is characterised in that：In step 4, pipe canopy use outer diameter Φ 89mm, hot rolling without Steel pipe processing is stitched, often saves long 3~4m, and four row's Φ 8mm extravasating holes, quincunx laying, hole are drilled with along two perpendicular diameters of tube wall Spacing 30cm often saves the lined pipe welding of pipe canopy, and tip, prong length 15cm are processed into every Guan Peng front end.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139046A (en) * | 2018-08-23 | 2019-01-04 | 洛阳恒诺锚固技术有限公司 | Segmenting slip casting self-drilling type barrel vault advanced support method |
| CN111851406A (en) * | 2020-06-07 | 2020-10-30 | 黄河勘测规划设计研究院有限公司 | Strengthening treatment method for deep-buried geological defects of riverbed |
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