CN108194104A - A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel - Google Patents
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel Download PDFInfo
- Publication number
- CN108194104A CN108194104A CN201711498961.XA CN201711498961A CN108194104A CN 108194104 A CN108194104 A CN 108194104A CN 201711498961 A CN201711498961 A CN 201711498961A CN 108194104 A CN108194104 A CN 108194104A
- Authority
- CN
- China
- Prior art keywords
- grouting
- rock pillar
- grouting pipe
- clear
- interval rock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to a kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, belong to technical field of tunnel construction, by setting one to multiple row's injected hole in earth's surface, according to the sequence of construction that hole is jumped every row, using seamless steel pipe as Grouting Pipe, by flower hole grouting and reinforcing interval rock pillar, Grouting Pipe can effectively improve interval Rock pillar stability as support frame；Multistage every compression swelling mould bag by binding in Grouting Pipe, control slurries are spread in target area localization, while reach control land upheaval and sedimentation, reduce the effect of the influence to ground and its periphery；The injecting paste material based on rapid hardening plasmoid humor is used, can slurries gel time be adjusted according to the Real-time Feedback of live slip casting process, prevent slurries excess diffusion, it is cost-effective, coordinate and realize that the segmentation localization of interval rock pillar is reinforced every pressing mold bag.
Description
Technical field
The present invention relates to a kind of tunnel interval rock pillar reinforcement means, more particularly to a kind of to be directed to city shallow embedding small-clear-distance tunnel
The localization control grouting strengthening method that interval rock pillar is reinforced, belongs to technical field of tunnel construction.
Background technology
With the fast development of China's urban economy and being continuously increased for urban population quantity, the traffic pressure of large- and-medium size cities
Power is increasing.Subway is as a kind of passenger traffic volume is big, conveniently mode of transportation, it has also become most large- and-medium size cities emphasis
The public transit facility of construction.
Since city space is limited, the buried depth and spacing of subway tunnel are generally smaller, therefore bring a series of problem.
City shallow soil is mostly based on the bad great soil group such as miscellaneous fill, loess, silty clay and gravelly soil, if without effectively reinforcing easily
Lead to Tunnel Landslide, unstability；The interval rock pillar instability problem caused by spacing is small, stratum weakness is not in addition
It is good, it is difficult to which that higher intensity is provided so that there are many difficult points for the reinforcing of shallow embedding small-clear-distance tunnel interval rock pillar；And tunnel upper strata
The pipelines such as embedded heating power, combustion gas, telecommunications are numerous, and line distribution is only capable of Reference Design scheme with burial place, not clear accurate enough.
In traditional small-clear-distance tunnel interval rock pillar strengthened cases, it usually needs realized by high-pressure slip-casting to stratum
It reinforces, to solve the small interval rock pillar instability problem brought of spacing.But in urban subway tunnel engineering, due to buried depth compared with
Small, high-pressure slip-casting easily leads to surface uplift, causes the problems such as pavement destruction, line fracture, surface buildings destroy, therefore need
Grouting pressure is controlled, this has very big contradiction with conventional construction method.Current existing small-clear-distance tunnel construction method, spininess
To the mountain tunnel under the conditions of weak surrounding rock, same construction technology is difficult to be suitable for subway tunnel, and reason includes：(1) subway
Edpth of tunnel smaller.Since city space is limited, it is difficult to ensure that there are enough buried depths in tunnel, existing construction method is difficult to control ground
Table deforms；City shallow soil is mostly the soft soils such as loess, miscellaneous fill, and intensity is extremely low, and existing construction method is difficult to make interval rock
Column reaches intensity requirement.(2) subway tunnel needs stringent control earth's surface deformation.Due to subway tunnel environment complexity, earth's surface is built
Build object, various pipelines be also embedded in upper overburden layer, if therefore grouting and reinforcing process could not be controlled, earth's surface is caused to deform
Greatly, it will cause huge loss.
Invention content
In view of the deficiencies of the prior art, in face of the difficulty of conventional construction method and contradiction, the method for the present invention provides a kind of needle
Grouting strengthening method is controlled to the localization that shallow embedding small-clear-distance tunnel interval rock pillar is reinforced.It is noted using rapid hardening class injecting paste material in control
Grouting and reinforcing requirement can be reached under the premise of pulp material dosage, reduce slurries waste, it is cost-effective, it shortens the construction period；Multistage mould
Bag control slurries localization diffusion, it is ensured that slurries fully reinforce interval rock pillar；Multiple rows of Grouting Pipe plays skeletal support effect simultaneously, carries
High consolidation effect；Effectively control stratum and earth's surface deformation, ensure that earth's surface road surface, surrounding building etc. are unaffected.
Technical scheme is as follows：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, includes the following steps：
(1) according to interval rock pillar width and formation condition, one to multiple row's injected hole, the ground at injected hole are designed in earth's surface
Table carries out construction punching；
(2) with reference to grouting design requirement and target area depth, design, processing Grouting Pipe, with reference to grouting and reinforcing target area
Circular hole is beaten Grouting Pipe in domain, while binds bulging die bag；
(3) base area layer porosity and target reinforcing area range estimation grouting amount, with rapid hardening class injecting paste material to slip casting
Pipe carries out slip casting, by adjusting slurries gel time, controls practical grouting amount close with estimation grouting amount.
In addition to slurries are injected, Grouting Pipe can also play skeletal support, and injection slurries form induration with the soil body, with slip casting
Pipe plays the role of reinforcing interval rock pillar jointly.
Grouting Pipe design, processing are mainly Grouting Pipe Design of length, nozzle design and play circular hole design, other Grouting Pipes ginseng
Number can refer to professional standard/construction requirement.
Preferably, in step (1), when in earth's surface design at least two rows of injected holes, construction punching sequence is according to every row
The sequence in hole is jumped, the punching of 1,3,5 ... odd rows is first carried out, further according to actual conditions, using even number row hole drilling as inspection hole
Or supplement injected hole；Injected hole is divided into 1~2m between row and row.Array pitch design can be according to actual conditions flexible design, if ground
Layer condition is preferable, and spacing can be increased suitably；Formation condition is poor, then spacing can be set smaller, if there is pipeline to need to avoid also
0~15 ° of angle can suitably be tilted.
Preferably, in step (2), level-one is bound every pressure area bulging die bag close to the position of earth's surface in Grouting Pipe；In slip casting
Pipe is positioned at one end binding two level stabilization zone bulging die bag of interval rock pillar stabilization zone, separate earth's surface.
It is further preferred that in step (2), Grouting Pipe binding level-one beats circular hole every the position of pressure area bulging die bag, passes through
Circular hole injects liquid into mould bag；Circular hole is beaten in the Grouting Pipe upper edge Grouting Pipe axially spaced-apart positioned at interval rock pillar stabilization zone；Circle
Hole aperture is 10mm, and the circular hole spacing in the Grouting Pipe of interval rock pillar stabilization zone is 20cm.Often by array distribution in building
Layout designs for quincuncial arrangement, i.e., vertical and horizontal dislocation in a row, matrix distribution.Liquid is injected into mould bag and to Grouting Pipe slip casting
Process is carried out at the same time, i.e., slip casting while mould bag expand solid soil and play reinforcement effect, injected in mould bag
It is also rapid hardening class injecting paste material.
It is further preferred that in step (2), level-one is every pressure area bulging die pocket position from 3~4m of earth's surface.It is squeezed by the expansion of mould bag
Close surrounding soil effectively improves rock pillar top soil strength, so as to which earth's surface be controlled not to be deformed.
It is further preferred that in step (2), the quantity of two level stabilization zone bulging die bag is at least two；Interval rock pillar adds
The top of Gu Qu sets a two level stabilization zone bulging die bag, diffuses up channel for separating slurries, slurries is made all to stay in mesh
Mark diffusion region；Along the down-set at least one two level stabilization zone bulging die bag of Grouting Pipe, until interval rock pillar stabilization zone lower end；Phase
Spacing between adjacent two level stabilization zone bulging die bag is 3~5m.
It is further preferred that in step (2), level-one is 3~4m every the length of pressure area bulging die bag vertical direction, level-one every
Pressure area bulging die bag transverse width is 1.5~2m；The length of two level stabilization zone bulging die bag vertical direction be 1~1.2m, two level
Stabilization zone bulging die bag transverse width is 1.5~2m.
Preferably, in step (2), Grouting Pipe is seamless steel pipe, and Grouting Pipe is handled close to the upper one end thread of earth's surface, note
Slurry pipe is connected with pvc pipe close to the upper one end of earth's surface, and Grouting Pipe is connect with pvc pipe by connector.PVC after slip casting
Pipe can dismantle, so as to which slip casting nozzle be made not expose to earth's surface.
It is further preferred that in step (2), the length of pvc pipe is 0.5m.
In terms of injecting paste material, rapid hardening class injecting paste material used in the method for the present invention, specific grout coordinate ratio can be according to scene
Slip casting process Real-time Feedback is adjusted, and it is grouting amount to adjust ratio Main Basiss, and grouting amount estimation foundation includes soil strength, reinforces
The conditions such as range and injecting paste material performance.
In terms of grouting parameter, since the present invention is for small buried depth tunnel, grouting pressure should not be excessively high, it is preferred that step
Suddenly in (3), when Grouting Pipe uses rapid hardening plasmoid humor-cement grout two fluid grouting, grouting pressure 1MPa；When Grouting Pipe uses
During cement list slurries slip casting, grouting pressure 0.5Mpa drafts slip casting dilation angle in the range of 0.9~1.2m, specific real
Can be as needed when applying slip casting process, it is dynamically adjusted according to numerical simulation, Site Detection.
Preferably, in step (3), in terms of slip casting ending standard, become with single hole grouting amount, grouting pressure and surface uplift
Shape controls slip casting ending standard using " amount-pressure-deformation " three and carries out grout injection control, specific standards are as follows as Con trolling index：1) when
Grouting amount is not up to design standard but grouting pressure reaches design final pressure, and maintain more than 5min, stops slip casting；2) it supplies water, electricity
Injected hole single hole grouting amount near the pipelines such as letter and rainwater is no more than the 30% of estimation grouting amount, when grouting amount is set close to single hole
After counting the grouting amount upper limit, if grouting pressure not up to designs final pressure, design final pressure can be reached by adjusting slurries gel time, and
Stop slip casting；3) the surface uplift deformation upper limit is 2mm/d, and it is 20mm to add up the upper limit, when earth's surface deformation reaches above-mentioned standard, is stood
Stop slip casting.
The beneficial effects of the present invention are：
In tunnel construction, surface uplift and the sedimentation of shallow tunnel are often difficult to control, and small-clear-distance tunnel
Interval rock pillar reinforces the stratum that needs reinforcement, and surface uplift is easy to cause, compared to existing small-clear-distance tunnel construction method, this hair
The advantage of bright method is：(1) the method for the present invention is directed to subway tunnel, i.e., for the shallow embedding small-clear-distance tunnel under urban environment,
This is the construction environment that other inventions are difficult in adapt to.
(2) Grouting Pipe can play skeleton branch after the completion of slip casting in interval rock pillar instability problem, the method for the present invention
Support acts on, and with slurries-soil solidifying body collective effect, the strength and stability of interval rock pillar is substantially increased, to a certain degree
On compensate for the disadvantage of surface layer soft soil insufficient strength, effectively improve consolidation effect.
(3) the method for the present invention introduces the design of multistage mould bag, multistage every compression swelling mould bag by being bound in Grouting Pipe,
Slurries localization can effectively be controlled to spread, effectively separated the channel that diffuses up of slurries, control slurries are deposited in target and add
Gu in region, it is ensured that the slurries of injection can fully reinforce interval rock pillar, its excess diffusion is avoided to influence the facilities such as surrounding pipeline,
Can also controller perturbation stratum and earth's surface deformation, ensure that earth's surface road surface, surrounding building etc. are unaffected, while change the close of the soil body
Reality, while by controlling grouting pressure, while reach control land upheaval and sedimentation is reduced to ground and its neighboring buildings
The effect of influence, energy ground extruding area's soil body simultaneously play certain reinforcement effect.Consolidation effect is more preferable, ensures engineering construction, operation
The safety of period.
(4) the method for the present invention takes into account injecting paste material, excellent using the consolidation effect based on rapid hardening class injecting paste material
Injecting paste material, effectively slurries can be controlled to condense, be easy to control slip casting dilation angle and consolidation effect is excellent, control slip casting
Grouting and reinforcing requirement can be reached under the premise of material utilization amount, unnecessary slurries are reduced and be lost in, according to live slip casting process
Real-time Feedback adjusts slurries setting time, prevents slurries excess diffusion, gives full play to slurries reinforcement effect, shorten the construction period, and saves
About cost improves soil strength, coordinates and realizes that the segmentation localization of interval rock pillar is reinforced every compression swelling mould bag.
Multistage mould bag can be divided into every pressure area mould bag and stabilization zone mould bag in the present invention, and two class mould bag effects, position, form are each
Different, interval pressure area mould bag length is longer, positioned at shallower stratum, suitable for the complicated urban environment residing for subway tunnel,
Earth's surface deforms main function in order to control, can be by every the compacted surrounding soil of pressure area mould bag when earth's surface settles, it is particularly possible to
The compacted lifting mould bag upper strata soil body, is lifted earth's surface, ensures that earth's surface deformation within controlled range, ensures urban surface pipeline
Safety；Stabilization zone mould bag length is shorter, positioned at interval rock pillar stabilization zone, suitable for city shallow embedding small-clear-distance tunnel flabbily
Layer environment, main function are partition slurries diffusion admittance, ensure that its localization in interval rock pillar stabilization zone is spread, fully reinforce rock
Column, while the mould bag after expansion also can increase interval rock pillar intensity together with slurries-soil solidifying body collective effect in itself.
Description of the drawings
Fig. 1 is the Grouting Pipe schematic diagram of the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city of the present invention；
Fig. 2 is that the present invention carries out interval rock pillar reinforcement means schematic diagram in physical simulation urban environment.
Wherein：1st, pvc pipe, 2, connector, 3, Grouting Pipe, 4, level-one every pressure area bulging die bag, 5, the expansion of two level stabilization zone
Mould bag, 6, Hua Kong, 7, interval rock pillar stabilization zone, 8, road surface, 9, highway sideline, 10, rainwater pipeline, 11, street lamp pipeline, 12, supply
Electric line, 13, telecommunication line, 14, water-supply line, 15, heating pipeline, 16, sewage pipeline, 17, natural gas line, 18, coal gas
Pipeline, 19, spring line, 20, right line center line, 21, right line design lines, 22, left line center line, 23, left line design lines.
Specific embodiment
The present invention will be further described by way of example and in conjunction with the accompanying drawings, but not limited to this.
Embodiment 1：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, includes the following steps：
(1) according to interval rock pillar width and formation condition, two rows of injected holes are designed in earth's surface, the earth's surface at injected hole into
Row construction punching；Its punching sequence of constructing first carries out the punching of odd row, further according to practical feelings according to the sequence that hole is jumped every row
Condition, using even number row hole drilling as inspection hole or supplement injected hole；Injected hole is divided into 1m between row and row.
(2) with reference to grouting design requirement and target area depth, design, processing Grouting Pipe, with reference to grouting and reinforcing target area
Circular hole is beaten Grouting Pipe in domain, while binds bulging die bag；Level-one is bound every pressure area bulging die close to the position of earth's surface in Grouting Pipe
Bag, level-one is every pressure area bulging die pocket position from earth's surface 3m；It ties up the one end for being located at interval rock pillar stabilization zone, separate earth's surface in Grouting Pipe
Prick two level stabilization zone bulging die bag.
Level-one is 3m every the length of pressure area bulging die bag vertical direction, and level-one is 2m every pressure area bulging die bag transverse width；
The length of two level stabilization zone bulging die bag vertical direction is 1m, and two level stabilization zone bulging die bag transverse width is 2m.
(3) base area layer porosity and target reinforcing area range estimation grouting amount, with rapid hardening class injecting paste material to slip casting
Pipe carries out slip casting, by adjusting slurries gel time, controls practical grouting amount close with estimation grouting amount.Grouting Pipe uses rapid hardening
Plasmoid humor-cement grout two fluid grouting, grouting pressure 1MPa；Slip casting dilation angle is drafted in the range of 0.9m.
In terms of slip casting ending standard, deformed as Con trolling index, adopted using single hole grouting amount, grouting pressure and surface uplift
Slip casting ending standard is controlled with " amount-pressure-deformation " three and carries out grout injection control, and specific standards are as follows：1) when grouting amount not up to designs
Standard but grouting pressure reach design final pressure, and maintain more than 5min, stop slip casting；2) pipelines such as water supply, telecommunications and rainwater are attached
Near injected hole single hole grouting amount is no more than the 30% of estimation grouting amount, after grouting amount designs the grouting amount upper limit close to single hole,
If grouting pressure not up to designs final pressure, design final pressure can be reached, and stop slip casting by adjusting slurries gel time；3) earth's surface
The protuberance deformation upper limit is 2mm/d, and it is 20mm to add up the upper limit, when earth's surface deformation reaches above-mentioned standard, stops slip casting immediately.
In addition to slurries are injected, Grouting Pipe can also play skeletal support, and injection slurries form induration with the soil body, with slip casting
Pipe plays the role of reinforcing interval rock pillar jointly.Grouting Pipe design, processing are mainly Grouting Pipe Design of length, nozzle design and beat
Circular hole designs, other Grouting Pipe parameters can refer to professional standard/construction requirement.
Embodiment 2：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 1, different
It is that in step (1), injected hole is divided into 2m between row and row.
Embodiment 3：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 1, different
It is that in step (2), Grouting Pipe binding level-one beats circular hole every the position of pressure area bulging die bag, injects liquid into mould bag by circular hole
Body；Circular hole is beaten in the Grouting Pipe upper edge Grouting Pipe axially spaced-apart positioned at interval rock pillar stabilization zone；Circular hole aperture is 10mm, in being located at
Every the circular hole spacing in the Grouting Pipe of rock pillar stabilization zone be 20cm.
Embodiment 4：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 1, different
It is that in step (2), level-one is every pressure area bulging die pocket position from earth's surface 4m.
Embodiment 5：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 3, different
It is that in step (2), the quantity of two level stabilization zone bulging die bag is two；The top of interval rock pillar stabilization zone sets a two level
Stabilization zone bulging die bag diffuses up channel for separating slurries, slurries is made all to stay in target diffusion region；Along Grouting Pipe to dividing into
At least one two level stabilization zone bulging die bag is put, until interval rock pillar stabilization zone lower end；Two neighboring stages stabilization zone bulging die bag it
Between spacing be 3m.
Embodiment 6：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 5, different
It is that in step (2), the spacing between the bulging die bag of two neighboring stages stabilization zone is 5m.
Embodiment 7：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 1, different
It is that in step (2), level-one is 4m every the length of pressure area bulging die bag vertical direction, and level-one is every pressure area bulging die bag transverse width
For 1.5m；The length of two level stabilization zone bulging die bag vertical direction is 1.2m, and two level stabilization zone bulging die bag transverse width is
1.5m。
Embodiment 8：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 5, different
It is that in step (2), Grouting Pipe is seamless steel pipe, and Grouting Pipe is handled close to the upper one end thread of earth's surface, and Grouting Pipe is close to earth's surface
Upper one end be connected with pvc pipe, Grouting Pipe is connect with pvc pipe by connector, and the length of pvc pipe is 0.5m.Slip casting knot
Pvc pipe can dismantle after beam, so as to which slip casting nozzle be made not expose to earth's surface.
Embodiment 9：
A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel, step are as described in Example 1, different
It is that in step (3), when Grouting Pipe uses cement list slurries slip casting, grouting pressure 0.5Mpa drafts slip casting dilation angle and exists
, can be as needed when slip casting process is embodied in the range of 1.2m, it is dynamically adjusted according to numerical simulation, Site Detection.
Experimental example 1：
Tunnel interval rock pillar strengthening construction, 2335 meters of the section road tunnel tunneling segment length, buried depth are carried out in specific section
It is 6~10 meters, road width is 32 meters, interval rock pillar wide 2~3m, mean breadth 2.1m, since its top is embedded with pipeline,
Injected hole cannot be squeezed into vertically, therefore be equipped with three row's injected holes altogether, be squeezed into respectively by certain angle of inclination.Top road section traffic volume is numerous
Busy, underground utilities are intensive, and crucial pipeline is away from tunnel vault about 8m.Tunnel both sides building stands in great numbers, and (Local topography is apart from tunnel side
Line minimum range is 2 meters).Complicated geology along the line, soil, stone are spaced apart, and soil property section mainly based on clay, there is loess intrusion；
Rock section is based on limestone (sedimentary rock), karsts developing area, and bedrock surface fluctuations are larger.
1 undisturbed soil basic physical and mechanical parameters table of table
Due to 6~10m of edpth of tunnel, Grouting Pipe need to grow 16~20m, and the lower end of pipe will be less than tunnel floor, use Φ 42
The steel pipe of × 4mm needs to process colored hole at deep 5~6m places, as to level-one every pressure area bulging die bag slip casting channel；Under pipe
Square 10m will process colored hole, as the channel to the bulging die bag slip casting of two level stabilization zone, and be mainly used for reinforcing interval rock pillar.One
Grade is every pressure area bulging die bag upper end away from 3~4m of earth's surface, long 4m, a diameter of 1.5m；Two level stabilization zone bulging die bag topmost one
Flushed with tunnel vault, long 1.2m, a diameter of 1.5m, set one every 4~5m downwards, due to this tunnel vault and bottom plate away from
From 8m or so, therefore in tunnel spring line depth, another two level stabilization zone bulging die bag is set.
As shown in Table 1, formation pore rate is 44.73%, and target reinforcing area is interval rock pillar, is in addition to this also had few
Such as table 2 such as the slurries in mould bag, usage amount is measured, wherein C is single liquid cement mortar, and GT (can be in power for GT-1 rapid hardening class injecting paste materials
Steady geotechnical engineering Co., Ltd is purchased in market), C-GT is the double slurries of cement-GT.Controlling grouting pressure, slip casting terminates in 0.5~1Mpa
Standard is：Injected hole single hole grouting amount ending standard near the pipelines such as water supply, telecommunications and rainwater is about 1.5 tons；Coal gas and heat
Injected hole single hole grouting amount ending standard near the key pipeline such as power is about 1 ton；When grouting amount is not up to design standard but note
Slurry pressure reaches design final pressure, and maintains more than 5min, stops slip casting；The surface uplift deformation upper limit is 2mm/d, and the accumulative upper limit is
20mm when earth's surface deformation reaches above-mentioned standard, stops slip casting immediately.The road is estimated according to existing no mould bag grouting method
The slurries usage amount of section engineering, with the practical slurries usage amount after multistage mould bag is used to compare, as shown in table 2, optimization is apparent.
2 slip casting of table optimizes the comparison for actually accomplishing quantities and design flow
It the following 4th is coating for collapsible loess, cohesive soil and gravelly soil to banket in the section, and loess is in plastic
Character state, in hardened condition, intensity is general, and collapsibility is medium, belongs to middle compression and changes greatly type, clay is in plastic character for part
State belongs to axis and compresses native, localized loss big by thickness effect, and compressibility is low.Rock mass is long for severely-weathered brightness from top to bottom in place
Rock, middle famp, middle weathering marl, rock bearing capacity is general, between Rock Mass Integrality is 0.13~0.36, rock matter
Amount grade is III~IV class.The improvement section hydrologic condition is complicated, and stratum is full water stratum, aqueous abundant, and main source is original
Rainwater is oozed under caused by the water, pipe leakage water and the rainy season heavy showers that are stored in stratum.The improvement section soil layer is essentially saturated yielding
Property loess formation, meeting water easily occurs significantly deformation, and original structure is destroyed, and self-stable ability reduces rapidly, and easily causes settlement of foundation, tunnel
Road such as caves at the additional hazards.
Calamity soft stratum is caused to carry out system reinforcement tunnel overlying, improve soil layer physical and mechanical property, made it have reliable
Ground bearing capacity.Subregion segmentation is designed using the present invention program, grouting treatment is carried out to stratum, using film bag grouting process, realize
The deep localization diffusion of slurries.By the system grouting and reinforcing of 10 days, which was greatly improved, permeability and soil
Body water content is greatly reduced.By Analysis of Geophysical Survey and inspection hole coring situation analysis, the region grouting consolidation effect is good, base
Originally reach acceptance condition.
Claims (10)
1. the interval rock pillar reinforcement means of a kind of city shallow embedding small-clear-distance tunnel, which is characterized in that include the following steps：
(1) one to multiple row's injected hole is designed in earth's surface, the earth's surface at injected hole carries out construction punching；
(2) it designs, process Grouting Pipe, beat Grouting Pipe circular hole, while bind bulging die bag；
(3) it estimates grouting amount, slip casting is carried out to Grouting Pipe with rapid hardening class injecting paste material, by adjusting slurries gel time, control
Practical grouting amount is close with estimation grouting amount.
2. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 1, which is characterized in that step
(1) in, when in earth's surface design at least two rows of injected holes, construction punching sequence first carries out strange according to the sequence that hole is jumped every row
The punching of number row, using even number row hole drilling as inspection hole or supplement injected hole；Preferably, injected hole is divided into 1 between row and row
~2m.
3. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 1, which is characterized in that step
(2) in, level-one is bound every pressure area bulging die bag close to the position of earth's surface in Grouting Pipe；It is located at interval rock pillar stabilization zone in Grouting Pipe
, one end binding two level stabilization zone bulging die bag far from earth's surface.
4. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 3, which is characterized in that step
(2) in, Grouting Pipe binding level-one beats circular hole every the position of pressure area bulging die bag；In the Grouting Pipe positioned at interval rock pillar stabilization zone
Circular hole is beaten along Grouting Pipe axially spaced-apart；Circular hole aperture be 10mm, the circular hole spacing in the Grouting Pipe of interval rock pillar stabilization zone
For 20cm.
5. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 3, which is characterized in that step
(2) in, level-one is every pressure area bulging die pocket position from 3~4m of earth's surface.
6. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 3, which is characterized in that step
(2) in, the quantity of two level stabilization zone bulging die bag is at least two；The top of interval rock pillar stabilization zone sets a two level to reinforce
Area's bulging die bag；Along the down-set at least one two level stabilization zone bulging die bag of Grouting Pipe；Two neighboring stages stabilization zone bulging die bag
Between spacing be 3~5m.
7. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 3, which is characterized in that step
(2) in, level-one is 3~4m every the length of pressure area bulging die bag vertical direction, and level-one is 1.5 every pressure area bulging die bag transverse width
~2m；The length of two level stabilization zone bulging die bag vertical direction is 1~1.2m, and two level stabilization zone bulging die bag transverse width is
1.5~2m.
8. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 1, which is characterized in that step
(2) in, Grouting Pipe is seamless steel pipe, and Grouting Pipe is handled close to the upper one end thread of earth's surface, and Grouting Pipe is close to the top of earth's surface
One end is connected with pvc pipe, and Grouting Pipe is connect with pvc pipe by connector；
Preferably, in step (2), the length of pvc pipe is 0.5m.
9. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 1, which is characterized in that step
(3) in, when Grouting Pipe uses rapid hardening plasmoid humor-cement grout two fluid grouting, grouting pressure 1MPa；When Grouting Pipe uses water
During mud list slurries slip casting, grouting pressure 0.5Mpa, slip casting dilation angle is in the range of 0.9~1.2m.
10. the interval rock pillar reinforcement means of shallow embedding small-clear-distance tunnel in city according to claim 1, which is characterized in that step
Suddenly in (3), in terms of slip casting ending standard, using the deformation of single hole grouting amount, grouting pressure and surface uplift as Con trolling index：1)
When grouting amount is not up to design standard but grouting pressure reaches design final pressure, and maintain more than 5min, stop slip casting；2) supply water,
Injected hole single hole grouting amount near the pipelines such as telecommunications and rainwater is no more than the 30% of estimation grouting amount, when grouting amount is close to single hole
After designing the grouting amount upper limit, if grouting pressure not up to designs final pressure, design final pressure can be reached by adjusting slurries gel time,
And stop slip casting；3) the surface uplift deformation upper limit is 2mm/d, and it is 20mm to add up the upper limit, when earth's surface deformation reaches above-mentioned standard,
Stop slip casting immediately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711498961.XA CN108194104B (en) | 2017-12-29 | 2017-12-29 | Method for reinforcing middle rock pillar of urban shallow-buried small-clear-distance tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711498961.XA CN108194104B (en) | 2017-12-29 | 2017-12-29 | Method for reinforcing middle rock pillar of urban shallow-buried small-clear-distance tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108194104A true CN108194104A (en) | 2018-06-22 |
| CN108194104B CN108194104B (en) | 2020-06-02 |
Family
ID=62587787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711498961.XA Expired - Fee Related CN108194104B (en) | 2017-12-29 | 2017-12-29 | Method for reinforcing middle rock pillar of urban shallow-buried small-clear-distance tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108194104B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156034A (en) * | 2020-02-24 | 2020-05-15 | 山东大学 | Pre-embedded grouting unit and soft stratum settlement control system and method |
| CN113047834A (en) * | 2021-04-16 | 2021-06-29 | 中国煤炭地质总局勘查研究总院 | Method for reinforcing nuclear area of strip-shaped coal pillar |
| CN113700503A (en) * | 2021-08-30 | 2021-11-26 | 长业建设集团有限公司 | Uneven settlement reinforcement treatment method in expressway tunnel bottom plate construction process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003189A (en) * | 2010-12-20 | 2011-04-06 | 中铁隧道集团有限公司 | Mold bag grouting method and device for quickly and uniformly reinforcing soft stratum |
-
2017
- 2017-12-29 CN CN201711498961.XA patent/CN108194104B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003189A (en) * | 2010-12-20 | 2011-04-06 | 中铁隧道集团有限公司 | Mold bag grouting method and device for quickly and uniformly reinforcing soft stratum |
Non-Patent Citations (1)
| Title |
|---|
| 王凌: "《盾构隧道小间距加固实例分析》", 《山西建筑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156034A (en) * | 2020-02-24 | 2020-05-15 | 山东大学 | Pre-embedded grouting unit and soft stratum settlement control system and method |
| CN113047834A (en) * | 2021-04-16 | 2021-06-29 | 中国煤炭地质总局勘查研究总院 | Method for reinforcing nuclear area of strip-shaped coal pillar |
| CN113047834B (en) * | 2021-04-16 | 2022-11-18 | 中国煤炭地质总局勘查研究总院 | Method for reinforcing nuclear area of strip-shaped coal pillar |
| CN113700503A (en) * | 2021-08-30 | 2021-11-26 | 长业建设集团有限公司 | Uneven settlement reinforcement treatment method in expressway tunnel bottom plate construction process |
| CN113700503B (en) * | 2021-08-30 | 2023-08-25 | 长业建设集团有限公司 | Non-uniform settlement reinforcement treatment method in expressway tunnel bottom plate construction process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108194104B (en) | 2020-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106499413A (en) | A kind of Shallow-buried section tunnel stratum consolidation construction method | |
| CN102505598B (en) | Method for reinforcement construction of soft soil foundation by exchange-filling with foam lightweight soil | |
| CN204059332U (en) | A kind of concrete precast pipe pile and piling prepressing Soft Ground device | |
| CN209924998U (en) | Shallow earthing shield tunnel is worn road reinforcement protection architecture down | |
| CN103883328B (en) | The dark construction method of half lid half of high steep V-type coombe biased segment is worn under separate tunnel | |
| CN104652451A (en) | Coal mining subsidence area administration method for loess hilly-gully region | |
| CN103911996B (en) | Close on existing building steel sheet pile and pull out construction method | |
| CN106640096A (en) | Construction method for penetrating through tunnel of backfilling soil section and transition section | |
| CN108194104A (en) | A kind of interval rock pillar reinforcement means of city shallow embedding small-clear-distance tunnel | |
| CN109441456A (en) | A kind of the tunnel structure and its construction method of weakness Facility-sliding strata | |
| CN106703044A (en) | Flow-plastic-shaped flushing and filling soil weak stratum sloping combination support method | |
| CN103321234B (en) | Constructing method of load-bearing structure built on high slope or geological complex area | |
| CN109024458A (en) | A kind of coal mine subsidence land landscape revetment and the construction method of water-bed antiseepage | |
| CN108677982A (en) | Complex geological condition foundation pit substrate excavates Tunnel gushing treatment method | |
| CN205260041U (en) | Method of freezing supporting construction is spouted soon to level | |
| CN203161244U (en) | Existing subway underground excavation running tunnel protection structure | |
| CN110306586A (en) | A kind of foundation reinforcement method for traditional architecture | |
| CN206204972U (en) | A kind of prefabricated tubular pile as well-points dewatering | |
| CN109898556A (en) | A kind of underground pipe gallery structure and sunk type construction method | |
| CN109268063A (en) | The method for constructing gob side entry retaining shield lane wall using drift-sand filling net cage | |
| CN207176700U (en) | A kind of solid matter perfusion inner support of pile foundation ditch permanent support structure under complex environment | |
| CN107700514B (en) | Processing method for selecting structural style of soft foundation | |
| CN203499695U (en) | Reinforcing structure for shallow-buried tunnel in bustling urban area | |
| CN106120822B (en) | A kind of method for protecting support and device that prevent mud stone from coming down | |
| CN209195412U (en) | A kind of tunnel structure suitable for weak Facility-sliding strata |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200602 Termination date: 20211229 |