CN109162722A - It is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel - Google Patents
It is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel Download PDFInfo
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- CN109162722A CN109162722A CN201811183048.5A CN201811183048A CN109162722A CN 109162722 A CN109162722 A CN 109162722A CN 201811183048 A CN201811183048 A CN 201811183048A CN 109162722 A CN109162722 A CN 109162722A
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- grouting
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- cloth bag
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- geotechnological cloth
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a kind of advanced compacting grouting and reinforcing methods in the loose weak stratum for being applicable in shallow-depth-excavation tunnel, stratum densification performance including passing through loose weak stratomere by testing testing tunnel, determine the attainable densification degree of stratum institute under different grouting pressures, and mechanical property and anti-permeability performance corresponding to different densification degree；Different Strata densification degree, influence of the grouting reinforced region thickness to tunnel excavation stability are analyzed, so that it is determined that target grouting pressure, grouting reinforced region thickness；Determine that the maximum swelling radius for expanding geotechnological cloth bag and surface grouting hole arrange spacing；Production is with the Grouting Pipe for expanding geotechnological cloth bag；Implement injected hole bore operation in earth's surface, tripping in is with the Grouting Pipe for expanding geotechnological cloth bag after injected hole reaches predetermined depth；Slip casting is carried out using rapid hardening class injecting paste material, stops slip casting when grouting pressure reaches target grouting pressure；Filling closing is carried out to the gap between Grouting Pipe and injected hole；Complete the slip casting work of all injected holes.
Description
Technical field
The present invention relates to constructing tunnel fields, and in particular to a kind of soft stratum suitable for shallow-depth-excavation tunnel is pressed in advance
Close grouting strengthening method
Background technique
Urban subway tunnel is generally shallow tunnel, and it is loose weak that the 4th is often passed through in subway tunnel process of construction
Layer, such as rich water sandy soils, soft clay layer stratum, since above-mentioned stratum has the characteristics that loosely organized, cementability is poor, in tunnel
The engineering accidents such as Tunnel Landslide are easily induced in road digging process, seriously threaten tunnel excavation safety.Slip casting is that reinforcing is loose soft
The effective means on weak stratum, this method carry out slip casting in advance by the loose weak stratum to tunnel excavation front of tunnel heading and add
Gu the mechanical property and anti-permeability performance on the stratum are improved, thus the surrounding rock stability during guaranteeing tunnel excavation.In city
Common grouting method has two methods of pre-grouting in hole, earth's surface pre-grouting, above two side in iron shallow-depth-excavation tunnel
The reinforcement principle of method is to inject gelation slurries in loose weak stratum, and slurries are mainly carried out in the earth formation with splitting type
Diffusion, when slurries are after range of scatter inner gel solidifies, in a variety of reinforcement modes works such as slurry arteries and veins skeletal support, stratum densification consolidation
Under, stratum overall mechanical properties and anti-permeability performance are improved.But the above method has the disadvantage that 1. slurries diffusion
Control is difficult, and since slurries are mainly spread in the earth formation with splitting type, grout spreading range is typically much deeper than target slip casting and adds
Gu range, the effective retention ratio of slurries is lower, and slurries waste is serious；2. consolidation effect is difficult to ensure, due to slurries splitting diffusion
Resistance is lower, causes grouting pressure lower (general < 1MPa), densification degree of the stratum under grouting pressure effect is lower, stratum
Mechanical property and anti-permeability performance increase not significant.
Summary of the invention
In order to solve the existing deficiency for passing through loose weak stratomere slurry injection technique for shallow-depth-excavation tunnel, the present invention is mentioned
A kind of advanced compacting grouting and reinforcing method in the loose weak stratum suitable for shallow-depth-excavation tunnel has been supplied, can have been realized by this method
To the localization grouting and reinforcing in tunnel vault region, injecting paste material utilization rate is greatly improved, grouting consolidation effect is effectively ensured.
The loose weak stratum advanced compacting grouting and reinforcing method of the present invention for being applicable in shallow-depth-excavation tunnel, including
Following steps:
Step 1: the stratum densification performance of loose weak stratomere is passed through by testing testing tunnel, determines different slip castings
The attainable densification degree of stratum institute under pressure, and mechanical property and anti-permeability performance corresponding to different densification degree；
Step 2: analysis Different Strata densification degree, influence of the grouting reinforced region thickness to tunnel excavation stability, thus
Determine target grouting pressure, grouting reinforced region thickness；
Step 3: according to the corresponding stratum densification degree of target grouting pressure, the maximum swelling for expanding geotechnological cloth bag is determined
Radius and surface grouting hole arrange spacing；
Step 4: with the Grouting Pipe for expanding geotechnological cloth bag, length and the grouting reinforced region for expanding geotechnological cloth bag are thick for production
Spend consistent, the length of Grouting Pipe is consistent with edpth of tunnel；
Step 5: implement injected hole bore operation in earth's surface, tripping in is with expansion geotechnique after injected hole reaches predetermined depth
The Grouting Pipe of cloth bag；
Step 6: slip casting is carried out using rapid hardening class injecting paste material by Grouting Pipe, when grouting pressure reaches target slip casting pressure
Stop slip casting when power.
Step 7: filling closing is carried out to the gap between Grouting Pipe and injected hole.
Step 8: repeating step 5~step 7, completes the slip casting work of all injected holes.
Step 9: tunnel excavation, supporting.
In the step 1, the densification performance on loose weak stratum can be determined by confined compression test, different densification journeys
Mechanical property corresponding to degree stratum and anti-permeability performance can be tested by confined compression test, shearing test and osmotic coefficient investigating
It determines, the above test method meets Standard for test methods of earthworks (GB/T50123-1999).
In the step 3, surface grouting hole uses quincuncial arrangement, expand the maximum swelling radius of geotechnological cloth bag according to
Following formula calculates:
In formula, R is the maximum swelling radius for expanding geotechnological cloth bag, and D is the spacing of wells, n0For loose weak stratum initial apertures
Gap rate, P are target grouting pressure, and n (P) is the loose weak formation pore rate under target grouting pressure.
The derivation process of above formula is as follows:
Since drilling is according to quincuncial arrangement, spacing of wells D, therefore the row's of drilling spacing is D/2, the influence of single injected hole
Range area is S=D2/ 2, according to slip casting coverage area S, stratum initial porosity n0And the ground under grouting pressure P effect
Layer porosity n (P), the expansion area that can obtain expanding geotechnological cloth bag is S (n0- n (P)), while expanding the expansion of geotechnological cloth bag
Area can also be expressed as π R with maximum swelling radius R2, can obtain expanding the maximum swelling radius of geotechnological cloth bag by fortran
The calculation formula of R.
The Grouting Pipe used in the step 4 has following feature,
Geotechnological cloth bag is expanded to be made of high-strength geotextile, in the diameter and step 3 after cloth bag expansion determined by most
Big expansion radius is consistent, expands geotechnological cloth bag and is wrapped in Grouting Pipe and is fixed using folding mode, expands geotextiles
The both ends of bag are fixed in Grouting Pipe.
Grouting Pipe material is metal tube, and Grouting Pipe passes through the geotechnological cloth bag part of expansion and equally distributed extravasating hole, note is arranged
Slurry bottom of the tube is closed end, and slurries only enter the geotechnological cloth bag of expansion by extravasating hole.
In the step 6, the main purpose using rapid hardening plasmoid humor is the slurries analysis after utmostly preventing slip casting
Water, slip casting Seed harvest volume caused by reducing because of slurries bleed reduce.Cement soluble glass paste can be used in rapid hardening class injecting paste material
Slurry, the cement grout ratio of mud control between W/C=0.8~1, and the biliquid volume ratio control of cement grout and waterglass slurries exists
Between C:S=3~4:1.
In the step 7, injecting paste material used is closed in filling can be used cement single slurry, the control of the cement grout ratio of mud
Between W/C=0.8~1.
Technical principle of the invention: it is evenly arranged in target grouting and reinforcing region (i.e. grouting reinforced region) with swelled ground
The Grouting Pipe of work cloth bag expands geotechnological cloth bag by injecting slurries into the geotechnological cloth bag of expansion, and then around compaction grouting pipe
Loose weak stratum, expand and form cylindrical slurry Seed harvest after the completion of geotechnological cloth bag grouting, finally in target grouting and reinforcing area
The compound stratum constituted by cylindrical slurry Seed harvest and by densification stratum, equally distributed cylindrical slurry Seed harvest pair are formed in domain
Stratum will play clump of piles reinforcement effect, and be significantly stronger than by the mechanical property on densification stratum and anti-permeability performance initial loose soft
Weak stratum, under the synergy of efficiency of pile groups and stratum layer compaction effect, loose weak stratum is effectively reinforced, it is ensured that tunnel
Road excavation supporting safety.
The beneficial effects of the present invention are:
1. the localization slip casting to tunnel vault target reinforcing area can be realized, solves slurries diffusion control in traditional slip casting
Difficult problem, the slurries retention ratio in target reinforcing area can reach 100%, greatly improve the effective use of injecting paste material
Rate, corresponding slip casting time shorten, and construction efficiency is greatly improved.
Grout mixing is limited 2. using and expanding geotechnological cloth bag, slip casting resistance mostlys come from during slip casting
The counter-force of compaction deformation is resisted on loose weak stratum, and grouting pressure can reach higher level (> 2MPa), and densification degree in stratum is high,
Grouting consolidation effect is effectively ensured.
3. using surface grouting form of construction work, excavation supporting process in hole will not be impacted, be applied compared to slip casting in hole
Work mode greatly improves tunnel excavation work efficiency.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is advanced compacting grouting and reinforcing schematic diagram；
Fig. 2 is to expand Grouting Pipe construction profile before geotechnological cloth bag expands；
Fig. 3 is to expand geotechnological cloth bag to expand grouting behind shaft or drift lining pipe construction profile；
Fig. 4 is to expand Grouting Pipe structure drawing in side sectional elevation before geotechnological cloth bag expands；
Fig. 5 is to expand geotechnological cloth bag to expand grouting behind shaft or drift lining pipe structure drawing in side sectional elevation；
Fig. 6 is surface grouting drilling arrangement schematic diagram.
1 --- tunnel, 2 --- loose weak clay layer, 3 --- grouting reinforced region, 4 --- the geotechnological cloth bag of expansion, 5 ---
Earth's surface, 6 --- injected hole, 7 --- Grouting Pipe, 8 --- low-intensity adhesive tape；9 --- high-intensitive iron wire, 10 --- extravasating hole.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination；
As background technique is introduced, in the prior art there is common grouting method in city underground shallow-depth-excavation tunnel
Two methods of pre-grouting, earth's surface pre-grouting, the reinforcement principle of above two method are to inject gelation slurries in hole
In loose weak stratum, slurries are mainly diffused in the earth formation with splitting type, when slurries solidify in range of scatter inner gel
Afterwards, under a variety of reinforcement mode effects such as slurry arteries and veins skeletal support, stratum densification consolidation, stratum overall mechanical properties and anti-permeability performance
It is improved.But the above method has the disadvantage that 1. slurries diffusion control is difficult, due to slurries in the earth formation mainly with
Splitting type diffusion, grout spreading range are typically much deeper than target grouting and reinforcing range, and the effective retention ratio of slurries is lower, slurries wave
Take serious；2. consolidation effect is difficult to ensure, since the resistance of slurries splitting diffusion is lower, cause grouting pressure it is lower (it is general <
1MPa), densification degree of the stratum under grouting pressure effect is lower, and stratum dynamics performance and anti-permeability performance growth be not significant.
As long as heretofore described high-strength geotextile refers to the geotextiles for being able to satisfy intensity requirement；Described is low
As long as intensity adhesive tape is also the adhesive tape for being able to satisfy intensity requirement；As long as the high-intensitive iron wire is also to be able to satisfy intensity to want
The iron wire asked, for intensity size itself without restriction effect；
In order to solve technical problem as above, present applicant proposes a kind of loose weak stratum for being applicable in shallow-depth-excavation tunnel
Advanced compacting grouting and reinforcing method；As shown in Figure 1, advanced compacting grouting and reinforcing schematic diagram；
In a kind of typical embodiment of the application, tunnel vault buried depth 15m, tunnel vault discloses loose weak clay
Layer, loose weak clay layer coboundary is apart from tunnel vault 3m, and lower boundary is below tunnel vault and apart from tunnel vault 1m；Needle
Compacting grouting and reinforcing method is carried out to the tunnel stratum, comprising the following steps:
Step 1: the stratum densification performance of loose weak clay layer 2 is passed through by testing testing tunnel 1, determines different notes
Starch the attainable densification degree of stratum institute under pressure, and mechanical property and anti-permeability performance corresponding to different densification degree.
Step 2: the influence of analysis Different Strata densification degree, 3 thickness of grouting reinforced region to tunnel excavation stability, most
Determine that target grouting pressure is 2MPa, grouting reinforced region 3 with a thickness of 3m eventually.
Step 3: determine that the maximum swelling radius for expanding geotechnological cloth bag 4 and 5 injected hole 6 of earth's surface arrange spacing.It is infused in target
It starches under pressure P=2MPa, loose weak formation pore rate is by n0=50% is decreased to n (P)=30%, determines that earth's surface injected hole bores
Pitch of holes D=1m, drilling row's spacing is 0.5m, is drilled as quincuncial arrangement, according to expanding geotechnological cloth bag maximum swelling radiuscope
Calculate formulaExpand the maximum swelling radius R=0.18m of geotechnological cloth bag.
Step 4: production is with the Grouting Pipe 7 for expanding geotechnological cloth bag, and the length for expanding geotechnological cloth bag 4 is 3m, Grouting Pipe
Length is consistent with edpth of tunnel；
Step 5: implement injected hole bore operation in earth's surface, injected hole is according to quincuncial arrangement, pitch of holes D=1m, drilling
Array pitch is 0.5m, and tripping in is with the Grouting Pipe for expanding geotechnological cloth bag after injected hole reaches predetermined depth；It is specific as shown in Figure 6；
Step 6: slip casting is carried out using cement-sodium silicate double liquid, stops slip casting, water when grouting pressure reaches 2MPa
Cement grout ratio of mud W/C=1 in mud-waterglass slurries, the biliquid volume ratio C:S=4:1 of cement grout and waterglass slurries.
Step 7: filling closing is carried out to the gap between Grouting Pipe and injected hole, filling is closed injecting paste material used and adopted
With cement single slurry, cement grout ratio of mud W/C=1.
Step 8: repeating step 5~step 7, completes the slip casting work of all injected holes.
Step 9: tunnel excavation, supporting.
In the step 1, the densification performance on loose weak stratum can be determined by confined compression test, different densification journeys
Mechanical property corresponding to degree stratum and anti-permeability performance can be tested by confined compression test, shearing test and osmotic coefficient investigating
It determines, the above test method meets Standard for test methods of earthworks (GB/T50123-1999).
The Grouting Pipe used in the step 4 has following feature, expands geotechnological cloth bag and uses high-strength geotextile system
At the diameter after cloth bag expansion should be consistent with maximum swelling radius identified in step 3, expands geotechnological cloth bag and uses
Folding mode is wrapped in Grouting Pipe and uses 7 binding and fixing of low-intensity adhesive tape, and the both ends for expanding geotechnological cloth bag pass through high intensity
9 binding and fixing of iron wire are in Grouting Pipe.Grouting Pipe material is iron pipe, and Grouting Pipe passes through uniform point of the geotechnological cloth bag part setting of expansion
The extravasating hole 10 of cloth, slip casting bottom of the tube are closed end, and slurries only enter the geotechnological cloth bag of expansion by extravasating hole；Specific expansion geotechnique
The view of cloth bag expansion front and back is as Figure 2-Figure 5；
In the step 6, the main purpose using rapid hardening plasmoid humor is the slurries analysis after utmostly preventing slip casting
Water, slip casting Seed harvest volume caused by reducing because of slurries bleed reduce.
In the step 7, injecting paste material used is closed in filling can be used cement single slurry, the control of the cement grout ratio of mud
Between W/C=0.8~1.
Technical principle of the invention: it is evenly arranged in target grouting and reinforcing region (i.e. grouting reinforced region) with swelled ground
The Grouting Pipe of work cloth bag expands geotechnological cloth bag by injecting slurries into the geotechnological cloth bag of expansion, and then around compaction grouting pipe
Loose weak stratum, expand and form cylindrical slurry Seed harvest after the completion of geotechnological cloth bag grouting, finally in target grouting and reinforcing area
The compound stratum constituted by cylindrical slurry Seed harvest and by densification stratum, equally distributed cylindrical slurry Seed harvest pair are formed in domain
Stratum will play clump of piles reinforcement effect, and be significantly stronger than by the mechanical property on densification stratum and anti-permeability performance initial loose soft
Weak stratum, under the synergy of efficiency of pile groups and stratum layer compaction effect, loose weak stratum is effectively reinforced, it is ensured that tunnel
Road excavation supporting safety.
The localization slip casting to tunnel vault target reinforcing area can be achieved in the present invention, solves slurries in traditional slip casting and spreads
Difficult problem is controlled, the slurries retention ratio in target reinforcing area can reach 100%, greatly improve the effective of injecting paste material
Utilization rate, corresponding slip casting time shorten, and construction efficiency is greatly improved.
Present invention employs expanding geotechnological cloth bag to limit grout mixing, slip casting resistance mainly comes during slip casting
From the counter-force for resisting compaction deformation in loose weak stratum, grouting pressure can reach higher level (> 2MPa), stratum densification degree
Height, grouting consolidation effect are effectively ensured.
The present invention uses surface grouting form of construction work, will not impact to excavation supporting process in hole, infuses compared in hole
Slurry form of construction work greatly improves tunnel excavation work efficiency.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (7)
1. the advanced compacting grouting and reinforcing method in the loose weak stratum for being applicable in shallow-depth-excavation tunnel, which is characterized in that including following
Step:
Step 1: the stratum densification performance of loose weak stratomere is passed through by testing testing tunnel, determines different grouting pressures
The attainable densification degree of lower stratum institute, and mechanical property and anti-permeability performance corresponding to different densification degree；
Step 2: analysis Different Strata densification degree, influence of the grouting reinforced region thickness to tunnel excavation stability, so that it is determined that
Target grouting pressure, grouting reinforced region thickness；
Step 3: according to the corresponding stratum densification degree of target grouting pressure, the maximum swelling radius for expanding geotechnological cloth bag is determined
And surface grouting hole arranges spacing；
Step 4: production expands the length and grouting reinforced region thickness phase of geotechnological cloth bag with the Grouting Pipe for expanding geotechnological cloth bag
Unanimously, the length of Grouting Pipe is consistent with edpth of tunnel；
Step 5: implement injected hole bore operation in earth's surface, tripping in is with the geotechnological cloth bag of expansion after injected hole reaches predetermined depth
Grouting Pipe；
Step 6: slip casting is carried out using rapid hardening class injecting paste material by Grouting Pipe, when grouting pressure reaches target grouting pressure
Stop slip casting；
Step 7: filling closing is carried out to the gap between Grouting Pipe and injected hole；
Step 8: repeating step 5~step 7, completes the slip casting work of all injected holes；
Step 9: tunnel excavation, supporting.
2. it is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel as described in claim 1,
It is characterized in that, in the step 1, the densification performance on loose weak stratum can be determined by confined compression test, different densification journeys
Mechanical property corresponding to degree stratum and anti-permeability performance can be tested by confined compression test, shearing test and osmotic coefficient investigating
It determines, the above test method meets Standard for test methods of earthworks.
3. it is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel as described in claim 1,
Be characterized in that, in the step 3, surface grouting hole uses quincuncial arrangement, expand the maximum swelling radius of geotechnological cloth bag according to
Following formula calculates:
In formula, R is the maximum swelling radius for expanding geotechnological cloth bag, and D is the spacing of wells, n0For loose weak stratum initial porosity,
P is target grouting pressure, and n (P) is the loose weak formation pore rate under target grouting pressure.
4. it is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel as described in claim 1,
It is characterized in that, expansion geotechnique's cloth bag in the step 4 is made of high-strength geotextile, diameter and step after cloth bag expansion
Identified maximum swelling radius is consistent in rapid three, expands geotechnological cloth bag and is wrapped in Grouting Pipe using folding mode；Expansion
The both ends of geotechnological cloth bag are fixed in Grouting Pipe.
5. it is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel as described in claim 1,
It is characterized in that, the Grouting Pipe material is metal tube, and it is equally distributed excessive that Grouting Pipe passes through the geotechnological cloth bag part setting of expansion
Hole is starched, slip casting bottom of the tube is closed end, and slurries only enter the geotechnological cloth bag of expansion by extravasating hole.
6. it is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel as described in claim 1,
It is characterized in that, in the step 6, cement-sodium silicate double liquid, cement grout water is can be used in the rapid hardening class injecting paste material
Gray scale controls between W/C=0.8~1, the biliquid volume ratio control of cement grout and waterglass slurries C:S=3~4:1 it
Between.
7. it is applicable in the advanced compacting grouting and reinforcing method in loose weak stratum of shallow-depth-excavation tunnel as described in claim 1,
It is characterized in that, in the step 7, injecting paste material used is closed in filling can be used cement single slurry, the control of the cement grout ratio of mud
Between W/C=0.8~1.
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|---|---|---|---|---|
| CN110778332A (en) * | 2019-10-16 | 2020-02-11 | 山东大学 | Reducing self-adaptive expansion grouting device for cracked and damaged part of secondary lining of tunnel and reinforcing method |
| CN110878696A (en) * | 2019-12-11 | 2020-03-13 | 中铁二十局集团第四工程有限公司 | Method for reinforcing surrounding rock of tunnel section at junction of upper soft and lower hard stratum shield method and mine method |
| WO2020248596A1 (en) * | 2019-06-13 | 2020-12-17 | 河南理工大学 | Protection structure for preventing ground heave caused by tunnel grouting reinforcement and grouting method |
| CN112098120A (en) * | 2020-08-04 | 2020-12-18 | 中国铁建股份有限公司 | Experimental method and device for measuring influence of split grouting on tunnel face stability |
| CN112127897A (en) * | 2020-09-22 | 2020-12-25 | 中铁十局集团西北工程有限公司 | Large-caliber directional grouting method for ultra-deep hole ground surface |
| CN112832246A (en) * | 2021-01-27 | 2021-05-25 | 江道宗 | Grouting device for hydraulic engineering construction |
| CN113047848A (en) * | 2021-05-14 | 2021-06-29 | 中铁二十四局集团有限公司 | Full-section radiation type grouting process and equipment |
| CN113417673A (en) * | 2021-07-22 | 2021-09-21 | 中交三航局第三工程有限公司 | Method for filling and grouting behind ground surface wall of tunnel or subway station |
| CN113565529A (en) * | 2021-07-24 | 2021-10-29 | 郑州大学 | Rear-buried testing device and mounting method for frost heaving pressure of shield tunnel segment lining |
| CN113898379A (en) * | 2021-09-29 | 2022-01-07 | 中铁二局第二工程有限公司 | Device and method for actually measuring grouting consolidation stratum pressure and parameter optimization |
| CN114263163A (en) * | 2021-12-29 | 2022-04-01 | 成都大学 | Grouting reinforcement method for diversion culvert passing through gravel stratum in high and cold regions and construction method |
| CN116025367A (en) * | 2022-10-28 | 2023-04-28 | 中国海洋大学 | Pre-applied horizontal stress, induced splitting and localized combined grouting reinforcement device and process |
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Application publication date: 20190108 Assignee: Jinan Li Wen geotechnical engineering Co., Ltd Assignor: China University of Petroleum (East China) Contract record no.: X2019370000023 Denomination of invention: Method for advanced compaction grouting reinforcement of spongy stratum suitable for shallow-buried excavation tunnel Granted publication date: 20190827 License type: Common License Record date: 20191211 |