CN109763483A - A kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique - Google Patents
A kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique Download PDFInfo
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- CN109763483A CN109763483A CN201910058885.3A CN201910058885A CN109763483A CN 109763483 A CN109763483 A CN 109763483A CN 201910058885 A CN201910058885 A CN 201910058885A CN 109763483 A CN109763483 A CN 109763483A
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- 238000007569 slipcasting Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000009412 basement excavation Methods 0.000 title claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 101100293261 Mus musculus Naa15 gene Proteins 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000010276 construction Methods 0.000 description 9
- 230000018109 developmental process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000010412 perfusion Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
It is buried excavation collapse broken formation upstriker segmenting slip casting technique the invention discloses a kind of thick 4th, specifically: first, pore-forming, drilling open pore size is Φ 150mm, mud off is used in Quaternary loose soils, it is drilled into stable basement rock or less 5m, cement paste is poured into bottom hole by orifice tube, by orifice tube down toward stablizing basement rock or less 5m before cement slurry initial set, using slurry processes fixed orifice pipe is sat, first time variable diameter is carried out, rock section is crept into using clear water, continue to be drilled into water flowing fractured zone bottom, carries out second of variable diameter；After pore-forming, tripping in Grouting Pipe welds in aperture by ring flange；Lower section slip casting is carried out by Grouting Pipe, after lower section slip casting, carries out upper section slip casting from orifice tube and Grouting Pipe gap, until reaching the standard of end hole, slip casting terminates.By segmenting slip casting, the compactness of goaf filling can be significantly increased, improves slip casting uniformity, improves drilling utilization efficiency, it is ensured that goaf harnessing engineering quality.
Description
Technical field
The invention belongs to goaf grouting technical fields, and in particular to a kind of thick 4th is buried excavation collapse broken formation
Upstriker segmenting slip casting technique.
Background technique
With the rapid development of our country's economy, infrastructure construction constantly improve, and land resource accelerates in short supply.Especially in mine
Area, land resource growing tension, more and more highways, railway, bridge, tunnel, dam and the construction of work China Democratic National Construction Association are inevitable
Encounter goaf ground.
Goaf ground itself is unstable, is easy to happen buckling deformation under the factors such as weight stress, earthquake and underground water；
After earth's surface builds buildings or structures, under imposed load effect, it is possible to break the original equilibrium state in goaf, it is again " living
Change " goaf, accelerate goaf foundation deformation, so that buildings or structures be caused to destroy.
The method of goaf harnessing mainly has perfusion filling method, passes through/cross over method, masonry method, shell backfill method of digging, is strong at present
6 kinds of rammer method, preloading methods.Wherein, most common method is perfusion filling method.In general, goaf harnessing is using " primary
Pore-forming, full section slip casting " construction technology.
In the 4th system covering thickness, buried, stratum crushing, the construction of multilayer goaf harnessing engineering, stratum cranny development
Degree is uneven and drilling is easily collapsed, and using " one-step pore-creating, full section slip casting " construction technology, be easy to cause slip casting section collapse hole, is caving
Band is full of leakiness, causes slip casting uneven, and drilling utilization rate reduces, and construction quality is difficult to ensure.
Summary of the invention
It is buried excavation collapse broken formation upstriker segmenting slip casting technique the object of the present invention is to provide a kind of thick 4th,
Solve the problems, such as that the prior art easy collapse hole of slip casting section, caving zone filling leakiness and slip casting in slip casting are non-uniform.
The technical scheme adopted by the invention is that a kind of thick 4th is buried excavation collapse broken formation upstriker segmentation note
Sizing process is specifically implemented according to the following steps:
Step 1, pore-forming, drilling open pore size are Φ 150mm, use mud off in Quaternary loose soils, are drilled into stabilization
5m below basement rock pours into 1:1.5 cement paste to bottom hole by orifice tube by Φ 127mm orifice tube down toward away from bottom hole 10m,
By orifice tube down toward basement rock or less 5m is stablized before cement slurry initial set, using seat slurry processes fixed orifice pipe, Gu the pipe time is no less than
24h；
Step 2, after sitting slurry, first time variable diameter is carried out, variable diameter aperture is Φ 110mm, and rock section is crept into using clear water,
Continue to be drilled into water flowing fractured zone bottom, carry out second of variable diameter, variable diameter aperture is Φ 91mm, within the scope of the whole above 20m of hole bottom hole
Take core；
Step 3, after pore-forming, rapid tripping in Grouting Pipe, Grouting Pipe pipe outer wall binds conduit, corresponding second of the variable diameter of Grouting Pipe
Steel tray is installed in position, and for steel tray to weld floral tube more than seat earth, 3~5m of steel tray top pours into 1 by pipeline:
1.5 cement pastes, finally, soldered vias pipe flange and Grouting Pipe screw connector, aperture is wrapped up to slip casting；
Step 4, when slip casting, lower section slip casting is carried out by Grouting Pipe first, after lower section slip casting, from orifice tube and slip casting
Pipe gap carries out upper section slip casting, until reaching the standard of end hole, slip casting terminates.
The features of the present invention also characterized in that
In step 1, before cement slurry initial set by orifice tube in hole, using seat slurry processes fixed orifice pipe, setting time
No less than for 24 hours, the height that pours of cement paste is 10m.
In step 1, the aperture Φ of orifice tube is 127mm；Orifice tube 20cm above ground level.
In step 3, the aperture Φ of Grouting Pipe is 48mm, Grouting Pipe 50cm above ground level.
In step 3, the slip casting pipe outer wall positioned at steel tray lower part covers rubber stoping flowing pulp plug, and rubber stoping flowing pulp plug is close to steel support
Disk.
The internal diameter of steel tray is 50mm, outer diameter 100mm；Rubber stoping flowing pulp plug is truncated cone, big mouth diameter 100mm,
Osculum diameter 90mm, height 100mm.
In step 3, the diameter of conduit is 20mm, and the spacing between conduit bottom and steel tray is 5m.
The beneficial effects of the present invention are:
By segmenting slip casting, the compactness of goaf filling can be significantly increased, improves slip casting uniformity, drilling is improved and utilizes
Efficiency, it is ensured that goaf harnessing engineering quality.
Detailed description of the invention
Fig. 1 is that the present invention a kind of thick 4th is pore-forming in buried excavation collapse broken formation upstriker segmenting slip casting technique
Structural schematic diagram；
Fig. 2 is middle and lower sections slip casting schematic diagram of the embodiment of the present invention；
Fig. 3 is upper section slip casting schematic diagram in the embodiment of the present invention.
In figure, 1. Quaternary loose soils, 2. basement rock；3. water flowing fractured zone, 4. caving zones, 5. coal columns, 6. goafs, 7. coals
Layer bottom plate, 8. screw connectors, 9. Grouting Pipes, 10. conduits, 11. ring flanges, 12. orifice tubes, 13.1:1.5 cement slurry, 14. steel supports
Disk, 15. rubber stoping flowing pulp plugs, 16. floral tubes, 17. pipe collars, 18. relief valves, 19. pressure gauges, 20. grouting pipes, 21. gaskets.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The present invention a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique, such as at pore structure
Shown in Fig. 1, it is specifically implemented according to the following steps:
Step 1, pore-forming, drilling open pore size are Φ 150mm, use mud off in Quaternary loose soils 1, are drilled into stabilization
2 or less 5m of basement rock pours into 1:1.5 cement paste 13 to bottom hole by orifice tube, in water by orifice tube 12 down toward away from bottom hole 10m
By orifice tube 12 down toward basement rock or less 5m is stablized before mud initial set, using seat slurry processes fixed orifice pipe 12, Gu the pipe time is no less than
24h；
The aperture Φ of orifice tube is 127mm, orifice tube 20cm above ground level；
The length that pours of cement paste 13 is 10m；
Step 2, after sitting slurry, first time variable diameter is carried out, variable diameter aperture is Φ 110mm, creeps into using clear water, continues to bore
To 3 bottom of water flowing fractured zone, second of variable diameter is carried out, variable diameter aperture is Φ 91mm, takes rock within the scope of the whole above 20m of hole bottom hole
Core；
Step 3, after pore-forming, rapid tripping in Grouting Pipe 9,9 pipe outer wall of Grouting Pipe binds conduit 10, Grouting Pipe 9 corresponding second
Steel tray 14 is installed in secondary variable diameter position, and 9 outer wall of Grouting Pipe positioned at 14 lower part of steel tray covers rubber stoping flowing pulp plug 15, and rubber is only starched
Plug 15 is close to steel tray 14, and to weld floral tube 16 down toward 7 or more seat earth, 14 3~5m of top of steel tray passes through steel tray 14
Conduit 10 pours into 1:1.5 cement paste 13, finally, soldered vias pipe flange 11 and Grouting Pipe screw connector 8, aperture wrapping to
Slip casting；
The aperture Φ of Grouting Pipe 9 is 48mm, the 50cm above ground level of Grouting Pipe 9；Connected between every two Grouting Pipe 9 using pipe collar 17
It connects；
The diameter of conduit 10 is 20mm, and the spacing between 10 bottom of conduit and steel tray 14 is 5m；
The internal diameter of steel tray 14 is 50mm, outer diameter 100mm；
Rubber stoping flowing pulp plug 15 is truncated cone, big mouth diameter 100mm, osculum diameter 90mm, height 100mm；
Step 4, when slip casting, first by Grouting Pipe 9 carry out lower section slip casting, after lower section slip casting, from orifice tube 12 with
9 gap of Grouting Pipe carries out upper section slip casting, until reaching the standard of end hole, slip casting terminates.
Embodiment
Goaf harnessing engineering under certain super-huge highway bridge, goaf are formed by fully mechanized mining, are mined one layer, roof control side
Formula is freely to be caving formula, and goaf is averaged buried depth 274m, and be averaged mining height 2.5m, and the 4th system buried depth that is averaged is more than 100m, the 4th system
There are one layer of layer of sand and two layers of boulder beds for coating lower part.Goaf " three bands " development, stratum crushing.Inlet well is divided into curtain
Hole, bridge pier injected hole and general injected hole three classes.Construction sequencing are as follows: first curtain hole, rear abutment injected hole, note as last
Starch hole；First two sequences after a sequence.Using " one-step pore-creating is divided to two sections of upward groutings " technique, specific implementation step is as follows:
(1) drilling construction: it include fixed point, drilling machine installation, aperture drilling, pour orifice tube, pore-forming, pour Grouting Pipe,
Seven steps of filling adaptor are installed；
1. pinpointing；Inlet well should using the measuring instruments such as RTK or total station according to engineering design hole location coordinate carry out by
Design position 1.0m is not to be exceeded in point setting-out on the spot, drilling physical location in principle；
2. rigging up；Smooth location, rigging up, level rack, body, prepare drilling tool, get ready casing, drill bit and
The equipment such as drilling rod, core barrel；
3. aperture is crept into；Using Φ 150mm aperture, mud off is used in Quaternary loose soils 1, drilling is bored using three wings
Head is followed by core barrel, increases stiffness of twist drill, it is ensured that borehole perpendicularity is drilled into stable 2 or less 5m of basement rock；By Φ 127mm orifice tube
12 down toward away from bottom hole 10m, and using profusely welding between orifice tube 12, when welding is measured using horizontal ruler, it is ensured that is hung down between orifice tube
Straight degree, pours into 1:1.5 cement paste 13 to bottom hole by pipeline, and pouring height is 10m, by orifice tube 12 before cement slurry initial set
Under away from bottom hole 10m, manage and (is not less than for 24 hours) admittedly using slurry processes are sat；
5. pore-forming；After sitting slurry, variable diameter is Φ 110mm (variable diameter), is crept into using clear water, continues to be drilled into water guide and split
3 bottom of gap band, final variable diameter are Φ 91mm (secondary variable diameter), and last 20m takes core；
6. pouring Grouting Pipe；After pore-forming, tripping in Φ 48mm Grouting Pipe 9,9 pipe outer wall of Grouting Pipe binds conduit 10, conduit 10
Diameter be 20mm, the corresponding secondary variable diameter position of Grouting Pipe 9 installs steel tray 14, is located at steel tray 14) outside the Grouting Pipe 9 of lower part
Wall covers rubber stoping flowing pulp plug 15, and rubber stoping flowing pulp plug 15 is close to steel tray 14；It is connected between Grouting Pipe 9 using pipe collar 17, steel tray 14
To weld floral tube 16 down toward 7 or more seat earth, 14 top 5m of steel tray pours into 1:1.5 cement paste 13 by pipeline；Conduit
Spacing between 10 bottoms and steel tray 14 is 5m；
7. installing filling adaptor；Under complete Grouting Pipe 9,9 screw connector 8 of soldered vias pipe flange 11 and Grouting Pipe, drilling
It checks and accepts, aperture is wrapped up to slip casting；
(2) mortar depositing construction；
1. lower section slip casting；As shown in Fig. 2, carrying out lower section slip casting, Grouting Pipe 9 and slip casting by Grouting Pipe 9 first when slip casting
It is connected between pipeline 20 using pipe collar 17；Water-solid ratio uses 1:1.2, and when pressure gauge 19 reaches 2MPa, pump amount is less than 50L/min,
More than 15min, which terminates, and opens relief valve 18；
2. upper section slip casting；As shown in figure 3, carrying out upper section note from orifice tube 12 and 9 gap of Grouting Pipe after lower section slip casting
Slurry, upper section slip casting are connected by ring flange, clip pad piece 21 between two ring flanges, it is ensured that and good seal, water-solid ratio use 1:1, when
When reaching design slip casting ending standard, which terminates.
Grouting serous fluid is cement and flying ash grout, and grout coordinate ratio is as follows: bridge pier curtain hole, cement: flyash match ratio is 2:
8, and the accelerator of cement weight 3%~5% is added；Bridge pier injected hole, cement: flyash match ratio is 3:7；General slip casting
Hole, cement: flyash match ratio is 2:8；Slip casting ending standard is that grouting pressure reaches 2MPa, and pump amount is less than 50L/min, is more than
15min。
In the method for the present invention, goaf upstriker segmenting slip casting technology, ring flange, can to use floral tube down toward seat earth
Influence of the collapse hole to lower section slip casting is effectively avoided, drilling utilization efficiency is improved.
Core barrel is followed by using three-wing bit, borehole perpendicularity can be increased, makes orifice tube smoothly down toward projected depth；Using
Sit slurry processes, it can be ensured that good seal between orifice tube and hole wall avoids slurries when upper section slip casting from being lost from the line of demarcation Tu Yan.
Since the 4th is that overburden cover is larger, core barrel drilling (increasing stiffness of twist drill) is followed by using three-wing bit, really
Protect borehole perpendicularity；Using profusely (screwed connection can also be directlyed adopt) is welded between orifice tube, measured using horizontal ruler when welding,
Ensure verticality between orifice tube；Drilling is vertical, orifice tube is vertical, just can guarantee orifice tube smoothly down toward projected depth.
Grouting Pipe can be stuck in using ring flange, stop grouting plug by secondary variable diameter position and realize segmentation, water is injected by conduit
Mud can further strengthen solid pipe and segmentation, it is ensured that implementation result.
Ring flange can effectively avoid influence of the collapse hole to lower section slip casting to use floral tube down toward seat earth, improve drilling
Utilization efficiency.
The last 20m of bottom hole takes core, and the purpose for taking core is to avoid rock powder precipitating blocking slip casting channel, disclose key
Stratum and evaluation slip casting effect.
By segmenting slip casting, the compactness of goaf filling can be significantly increased, improves slip casting uniformity, drilling is improved and utilizes
Efficiency, it is ensured that goaf harnessing engineering quality.
Claims (7)
1. a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique, which is characterized in that specifically according to
Following steps are implemented:
Step 1, pore-forming, drilling open pore size are Φ 150mm, use mud off in Quaternary loose soils, are drilled into stable basement rock
Following 5m pours into 1:1.5 cement paste to bottom hole by orifice tube, in cement by Φ 127mm orifice tube down toward away from bottom hole 10m
By orifice tube down toward basement rock or less 5m is stablized before slurry initial set, using seat slurry processes fixed orifice pipe, Gu the pipe time is no less than for 24 hours；
Step 2, after sitting slurry, first time variable diameter is carried out, variable diameter aperture is Φ 110mm, and rock section is crept into using clear water, is continued
It is drilled into water flowing fractured zone bottom, carries out second of variable diameter, variable diameter aperture is Φ 91mm, is taken within the scope of the whole above 20m of hole bottom hole
Core；
Step 3, after pore-forming, rapid tripping in Grouting Pipe, Grouting Pipe pipe outer wall binds conduit, corresponding second of the variable diameter position of Grouting Pipe
Steel tray is installed, for steel tray to weld floral tube more than seat earth, 3~5m of steel tray top pours into 1:1.5 by pipeline
Cement paste, finally, soldered vias pipe flange and Grouting Pipe screw connector, aperture is wrapped up to slip casting；
Step 4, when slip casting, lower section slip casting is carried out by Grouting Pipe first, it is empty from orifice tube and Grouting Pipe after lower section slip casting
Gap carries out upper section slip casting, until reaching the standard of end hole, slip casting terminates.
2. the according to claim 1 a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique,
It is characterized in that, before cement slurry initial set by orifice tube in hole, using slurry processes fixed orifice pipe is sat, being coagulated in the step 1
Gu the time is no less than for 24 hours, the height that pours of cement paste is 10m.
3. the according to claim 1 a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique,
It is characterized in that, the aperture Φ of orifice tube is 127mm in the step 1；Orifice tube 20cm above ground level.
4. the according to claim 1 a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique,
It is characterized in that, the aperture Φ of Grouting Pipe is 48mm, Grouting Pipe 50cm above ground level in the step 3.
5. the according to claim 1 a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique,
It is characterized in that, the slip casting pipe outer wall positioned at steel tray lower part covers rubber stoping flowing pulp plug, and rubber stoping flowing pulp plug is tight in the step 3
Paste steel tray.
6. the according to claim 5 a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique,
It is characterized in that, the internal diameter of steel tray is 50mm, outer diameter 100mm；Rubber stoping flowing pulp plug is truncated cone, big mouth diameter
100mm, osculum diameter 90mm, height 100mm.
7. the according to claim 1 a kind of thick 4th is buried excavation collapse broken formation upstriker segmenting slip casting technique,
It is characterized in that, the diameter of conduit is 20mm in the step 3, the spacing between conduit bottom and steel tray is 5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910058885.3A CN109763483B (en) | 2019-01-22 | 2019-01-22 | Up-going type sectional grouting process for thick fourth-system deep-buried mining cave-in broken stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910058885.3A CN109763483B (en) | 2019-01-22 | 2019-01-22 | Up-going type sectional grouting process for thick fourth-system deep-buried mining cave-in broken stratum |
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| CN109763483A true CN109763483A (en) | 2019-05-17 |
| CN109763483B CN109763483B (en) | 2021-04-23 |
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| CN201910058885.3A Expired - Fee Related CN109763483B (en) | 2019-01-22 | 2019-01-22 | Up-going type sectional grouting process for thick fourth-system deep-buried mining cave-in broken stratum |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617029A (en) * | 2019-09-16 | 2019-12-27 | 中国矿业大学 | Drilling segmented retreating type grouting method |
| CN111238327A (en) * | 2020-02-28 | 2020-06-05 | 白银有色集团股份有限公司 | Method for drilling blast holes in hard rock and blasting by using blast holes |
| CN111663918A (en) * | 2020-07-10 | 2020-09-15 | 中勘资源勘探科技股份有限公司 | Coal mining ground grouting process and grouting structure |
| CN112282640A (en) * | 2020-10-21 | 2021-01-29 | 重庆市地质矿产勘查开发局南江水文地质工程地质队 | Broken stratum bare hole drilling method |
| CN112593543A (en) * | 2020-12-18 | 2021-04-02 | 中国矿业大学(北京) | Well lattice type reinforcing method for building foundation in shallow-buried thick quicksand layer subsidence area |
| CN114108609A (en) * | 2021-09-29 | 2022-03-01 | 华北水利水电大学 | Goaf multistage subsection precise filling deep pile-forming construction process and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617029A (en) * | 2019-09-16 | 2019-12-27 | 中国矿业大学 | Drilling segmented retreating type grouting method |
| CN111238327A (en) * | 2020-02-28 | 2020-06-05 | 白银有色集团股份有限公司 | Method for drilling blast holes in hard rock and blasting by using blast holes |
| CN111663918A (en) * | 2020-07-10 | 2020-09-15 | 中勘资源勘探科技股份有限公司 | Coal mining ground grouting process and grouting structure |
| CN112282640A (en) * | 2020-10-21 | 2021-01-29 | 重庆市地质矿产勘查开发局南江水文地质工程地质队 | Broken stratum bare hole drilling method |
| CN112593543A (en) * | 2020-12-18 | 2021-04-02 | 中国矿业大学(北京) | Well lattice type reinforcing method for building foundation in shallow-buried thick quicksand layer subsidence area |
| CN112593543B (en) * | 2020-12-18 | 2021-10-08 | 中国矿业大学(北京) | Well lattice type reinforcing method for building foundation in shallow-buried thick quicksand layer subsidence area |
| CN114108609A (en) * | 2021-09-29 | 2022-03-01 | 华北水利水电大学 | Goaf multistage subsection precise filling deep pile-forming construction process and method |
| CN114108609B (en) * | 2021-09-29 | 2023-03-10 | 华北水利水电大学 | Construction method for multistage segmented precise filling and deep pile forming in goaf |
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| Publication number | Publication date |
|---|---|
| CN109763483B (en) | 2021-04-23 |
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