CN110258225A - Eliminate the liquefied grouting method of sand foundation - Google Patents
Eliminate the liquefied grouting method of sand foundation Download PDFInfo
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- CN110258225A CN110258225A CN201910509534.XA CN201910509534A CN110258225A CN 110258225 A CN110258225 A CN 110258225A CN 201910509534 A CN201910509534 A CN 201910509534A CN 110258225 A CN110258225 A CN 110258225A
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- mud
- grouting
- liquefied
- formation particles
- slurry
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Architecture (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to a kind of liquefied grouting methods of elimination sand foundation.The liquefied grouting method of elimination sand foundation smaller, the duration is shorter is externally influenced the object of the present invention is to provide a kind of.The technical scheme is that a kind of liquefied grouting method of elimination sand foundation, it is characterised in that: according to the sand liquefaction stratum of required reinforcing, specify the pore-size distribution situation of formation particles, obtain the average pore size of formation particlesThe characteristic diameter d for the high performance slurry that determination can be permeated in the bottom85,d85It is mud laser component curve not less than particle diameter corresponding to certain particles mass ratio 85%, determines the feature grain diameter of high performance slurry；Carry out grouting test, specify the relationship of pressure, mud property and slurry penetration path, determines the relevant parameter of scene slip casting；Scene indentation mud is constructed, by the mud amount and grouting pressure of monitoring injection, feedback construction and understanding grouting water-tight effect.The present invention is suitable for Construction Technique of Underground Works field.
Description
Technical field
The present invention relates to a kind of liquefied grouting methods of elimination sand foundation.Suitable for Construction Technique of Underground Works field.
Background technique
It is meeting under normal circumstances for the activity to construct infrastructure installations in the liquefied foundations such as fine sand, Extra-fine sand, silt
It is very prudent.Such as build when highway on sand foundation, it generallys use sand compaction pile, cement mixing pile, seal
Equal foundation treatment technologies carry out foundation stabilization, partially or completely eliminate sandy soil liquefied foundation.
When subway line route selection, avoid sandy soil liquefied foundation as far as possible under normal circumstances, or under wear or the side mode of wearing avoids liquid
Change ground and needs to carry out basement process or structural measure under normal circumstances if can not avoid in route selection to carry out reinforcement tunnel
The quake-resistant safety stability in road.
The case where correlation technique data shows, subway line locally passes through liquefied foundation is existing, but is worn on a large scale
The route of more liquefied foundation is seldom reported.With the arrival of China's subway construction climax, ancient stream channel is repeatedly changed its course so that Binjiang city
The case for being difficult to avoid sandy soil liquefied foundation when city's Metro Line Selection completely will gradually increase.
Current measures of foundation treatment, is not appropriate for the processing of liquefied foundation along a wide range of downtown area subway, and one
It is that there is no corresponding construction spaces on ground, it is very important on the current influence of traffic, second is that construction cost and duration are also opposite
It is longer.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above problems, providing a kind of externally influence smaller, duration
The shorter liquefied grouting method of elimination sand foundation.
The technical scheme adopted by the invention is that: a kind of liquefied grouting method of elimination sand foundation, it is characterised in that:
According to the sand liquefaction stratum of required reinforcing, the pore-size distribution situation of formation particles is specified, formation particles are obtained
Average pore size
The characteristic diameter d for the high performance slurry that determination can be permeated in the bottom85,
d85It is mud laser component curve not less than particle diameter corresponding to certain particles mass ratio 85%, determines high
The feature grain diameter of performance mud；
Carry out grouting test, specify the relationship of pressure, mud property and slurry penetration path, determines the correlation of scene slip casting
Parameter；
Scene indentation mud is constructed, and by the mud amount and grouting pressure of monitoring injection, feedback construction and understanding slip casting are anti-
Seep effect.
The method for determining the average pore size of formation particles includes:
It is obtained being not less than particle characteristic grain corresponding to the granular mass 15% of certain partial size according to formation particles component curve
Diameter D15, then acquire formation particles average pore size
By pressing mercury to test to obtain stratum pore-size distribution, formation particles average pore size is determined.
The high performance slurry uses the biliquid slurry system of modified alta-mud mud and waterglass.
The modified alta-mud calcium-base bentonite 90-96% by mass and soda ash 2- of the modified alta-mud mud is made
5%, aluminium oxide 2-8%；The modified alta-mud needs in advance 6h extruding in advance, is 1:4-1:10 with water quality ratio；
The waterglass is modified alta-mud quality of mud fluid 1-3%.
The beneficial effects of the present invention are: average pore size of the present invention by formation particles, determines the grain diameter of mud, institute
The mud of mixing can preferably adjust granular size in mud, can adapt to the sand foundation of different-grain diameter.
Permeable formation anti-seepage reinforcing is low in cost in the present invention, and modified alta-mud mud can be selected in material, can be on the spot
Materials, it is cheap；Common cement mixing pile carries out needing huge stirring equipment, mobile difficulty when stratum consolidation at present, leads
Cause construction cost is higher, efficiency is lower, and slip casting equipment used in the present invention can use pressure more light, easy to remove
Power grouting equipment, equipment investment threshold are lower.
Dual slurry mixed viscosity change, that is, presetting period can adjust very well in the present invention, as time went on, mix
The viscosity for closing liquid constantly increases, last completely plugged sand hole, increases sand foundation fine particle content and sand grains
Cohesive strength, the liquefaction that sand foundation is greatly lowered is possible, it even completely eliminates.
Specific embodiment
The present embodiment is a kind of liquefied grouting method of elimination sand foundation, specifically includes the following steps:
S01, the sand liquefaction stratum according to required reinforcing, specify the pore-size distribution situation of formation particles, obtain stratum
The average pore size of grain
The method in involved determining stratum aperture, can be not less than according to formation particles component curve in the present embodiment
Particle characteristic partial size D corresponding to the granular mass 15% of certain partial size15, then acquire formation particles average pore size
The method in involved determining stratum aperture can also determine directly by pressing mercury to test to obtain stratum pore-size distribution
Formation particles average pore size
The characteristic diameter d for the high performance slurry that S02, determination can permeate on the stratum85, generally
d85It is high performance slurry laser component curve not less than particle diameter corresponding to certain particles mass ratio 85%.
The method of involved determining high performance slurry grain diameter, can determine the particle component curve of mud according to laser point instrument,
It obtains not less than particle diameter d corresponding to certain particles mass ratio 85%85。
S03, carry out grouting test, specify the relationship of pressure, mud property and slurry penetration path, determine scene slip casting
Relevant parameter；
S04, scene indentation mud are constructed, by the mud amount and grouting pressure of monitoring injection, feedback construction and understanding note
Starch anti-seepage effect.
High performance slurry uses the biliquid slurry system of modified alta-mud mud and waterglass in this example, and modified alta-mud is made
The modified alta-mud of mud is calcium-base bentonite 90-96% by mass and soda ash 2-5%, aluminium oxide 2-8%, modified alta-mud
It needs to shift to an earlier date 6h extruding in advance, is 1:4-1:10 with water quality ratio.Waterglass is modified alta-mud quality of mud fluid 1-3%.
In certain section subway tunnel, master stratum is as follows from top to bottom:<1>miscellaneous fill and plain fill stratum,<2>chiltern powder
The stratum such as soil, flour sand and its interlayer,<3>Muddy Bottoms silty clay,<4>silty clay, wherein sandy silt, flour sand and its interlayer
Liquefaction soil layers are judged as, and it has a very wide distribution, this layer of soil is very thick, in depth from 1.6m to 22.1m.Level of ground water is located at
Subsurface 1-2m.Subway line can not avoid the soil layer.
By investigation, this layer of native partial size D15=0.35mm, the average pore size on the stratum are 0.07mm, i.e., 70 μm, it is desirable that
The characteristic diameter d of high performance slurry85At 35 μm or so.Simultaneously according to the bentone of mass ratio incorporation alumina powder 3.5%
Native (A material), mixes and stirs into mud, carries out slip casting experiment indoors.In order to consider subway tunnel tunnel segment structure safety, it is desirable that slip casting pressure
Power uses the grouting pressure of maximum 0.3MPa no more than 0.35MPa, this model experiment.Grouting system uses dual slurry mode,
Waterglass incorporation is 3% or so (B liquid) of quality of mud fluid, injects sandy soil stratum after the mixing of end.When pressure reaches 0.3MPa
When, the seepage distance of the mud reaches 2-3m.Test sand cohesive strength intensity mentions 20-30kPa, void ratio drop after slip casting is complete
As low as 25%, nearly half is reduced, reaches the liquefaction property purpose for eliminating the ground.
Claims (5)
1. a kind of liquefied grouting method of elimination sand foundation, it is characterised in that:
According to the sand liquefaction stratum of required reinforcing, the pore-size distribution situation of formation particles is specified, being averaged for formation particles is obtained
Aperture
The characteristic diameter d for the high performance slurry that determination can permeate on the stratum85,
d85It is mud laser component curve not less than particle diameter corresponding to certain particles mass ratio 85%, determines high-performance
The feature grain diameter of mud；
Carry out grouting test, specify the relationship of pressure, mud property and slurry penetration path, determines the related ginseng of scene slip casting
Number；
Scene indentation mud is constructed, by the mud amount and grouting pressure of monitoring injection, feedback construction and understanding grouting water-tight effect
Fruit.
2. the liquefied grouting method of elimination sand foundation according to claim 1, which is characterized in that determine formation particles
The method of average pore size includes:
It is obtained being not less than particle characteristic partial size D corresponding to the granular mass 15% of certain partial size according to formation particles component curve15,
Formation particles average pore size is acquired again
3. the liquefied grouting method of elimination sand foundation according to claim 1, it is characterised in that: by pressing mercury to test
To stratum pore-size distribution, formation particles average pore size is determined.
4. the liquefied grouting method of elimination sand foundation according to claim 1, it is characterised in that: the high performance slurry
Using the biliquid slurry system of modified alta-mud mud and waterglass.
5. the liquefied grouting method of elimination sand foundation according to claim 3, it is characterised in that: it is swollen that the modification is made
Moisten modified alta-mud calcium-base bentonite 90-96% by mass and soda ash 2-5%, the aluminium oxide 2-8% of native mud；The modification
Bentonite needs in advance 6h extruding in advance, is 1:4-1:10 with water quality ratio；
The waterglass is modified alta-mud quality of mud fluid 1-3%.
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| CN201910509534.XA CN110258225A (en) | 2019-06-13 | 2019-06-13 | Eliminate the liquefied grouting method of sand foundation |
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| CN201910509534.XA CN110258225A (en) | 2019-06-13 | 2019-06-13 | Eliminate the liquefied grouting method of sand foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997075A (en) * | 2020-08-13 | 2020-11-27 | 盐城工学院 | Cofferdam seepage prevention method taking soil with good water permeability as filler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126264A (en) * | 1994-12-26 | 1996-07-10 | 石寅生 | Making method for non-annular borehole cast-in-place pile |
| DE19928339A1 (en) * | 1999-06-30 | 2001-01-04 | Hilterhaus Karl Heinz | Method for lifting, aligning and fixing surface structures, e.g. sunken floor slabs, involves injecting a mixture of aqueous alkali silicate solution and isocyanate compound under the structure and then hardening in situ |
| CN103061329A (en) * | 2012-08-28 | 2013-04-24 | 中铁十八局集团有限公司 | Underwater grouting grout based on soft-base large immersed tunnel foundation and grouting process thereof |
| CN108706949A (en) * | 2018-06-08 | 2018-10-26 | 中国地质大学（北京） | Bentonite base injecting paste material and preparation method thereof |
| CN109279616A (en) * | 2018-12-03 | 2019-01-29 | 包头稀土研究院 | Method for preparing modified bentonite |
-
2019
- 2019-06-13 CN CN201910509534.XA patent/CN110258225A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1126264A (en) * | 1994-12-26 | 1996-07-10 | 石寅生 | Making method for non-annular borehole cast-in-place pile |
| DE19928339A1 (en) * | 1999-06-30 | 2001-01-04 | Hilterhaus Karl Heinz | Method for lifting, aligning and fixing surface structures, e.g. sunken floor slabs, involves injecting a mixture of aqueous alkali silicate solution and isocyanate compound under the structure and then hardening in situ |
| CN103061329A (en) * | 2012-08-28 | 2013-04-24 | 中铁十八局集团有限公司 | Underwater grouting grout based on soft-base large immersed tunnel foundation and grouting process thereof |
| CN108706949A (en) * | 2018-06-08 | 2018-10-26 | 中国地质大学（北京） | Bentonite base injecting paste material and preparation method thereof |
| CN109279616A (en) * | 2018-12-03 | 2019-01-29 | 包头稀土研究院 | Method for preparing modified bentonite |
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| Title |
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| 加瑞: "泥浆颗粒级配和地层孔径对泥水盾构泥膜形成的影响", 《中国公路学报》 * |
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Cited By (1)
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| CN111997075A (en) * | 2020-08-13 | 2020-11-27 | 盐城工学院 | Cofferdam seepage prevention method taking soil with good water permeability as filler |
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Application publication date: 20190920 |