CN110485408A - A kind of soft foundation reinforcing method - Google Patents
A kind of soft foundation reinforcing method Download PDFInfo
- Publication number
- CN110485408A CN110485408A CN201910680025.3A CN201910680025A CN110485408A CN 110485408 A CN110485408 A CN 110485408A CN 201910680025 A CN201910680025 A CN 201910680025A CN 110485408 A CN110485408 A CN 110485408A
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- China
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- intended
- reinforcing area
- construction method
- silt soil
- soil strata
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/04—Sampling of soil
-
- 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
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
Abstract
The present invention provides a kind of flabbiness ground strengthened construction method, includes the following steps: step 1): carrying out construction processing to reinforcing area application draining concretion method is intended to；Step 2): discharging consolidation operation is persistently carried out；Step 3): silt soil strata detection sample, the compressed coefficient a of detection silt soil strata detection sample, as a >=0.1MPa are drilled through being intended to reinforcing area‑1When, carry out step 4)；As a < 0.1MPa‑1When, it gos to step 2)；Step 4): cement mixing pile driving construction is carried out to reinforcing area is intended to.The present invention reinforces draining concretion method combination cement mixing pile driving construction to soft foundation, on the one hand, the problem of overcoming merely by long construction period brought by draining concretion method construction；On the other hand, the simple broken pile problem easily occurred by the flowing of silt soil strata by cement mixing pile driving construction bring mixing pile is overcome.
Description
Technical field
The present invention relates to foundation treatment technology more particularly to a kind of soft foundation reinforcing methods.
Background technique
Currently, China's major part sluice is all built near river, basis is mostly muck soil, and conventional sluice is weak
Method for processing foundation has replacement cushion method, draining concretion method and deep mixing method etc..Wherein drainage consolidation method have it is easy for construction,
Engineering cost is low, it is small to the disturbance of the soil body, can be with light-duty machinery the advantages that constructing on ultra-soft soil, but construction period is longer；
And cement mixing pile has many advantages, such as cheap, easy to operate, low noise, without contaminated sites, but it is biggish in water content
In silt soil, the cement grout of mixing pile meets water easily dilutable, leakage occurs, influences the growth of its intensity, and the stream of mud
There is the problems such as broken pile, interlayer in visibly moved easily lead to, and pile body integrity is unable to get guarantee.Therefore local geology feelings how to be combined
Condition, the relatively rationally more economic sluice based process method of the use of adaptation to local conditions are very necessary.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of soft foundation reinforcing methods.
The technical solution adopted by the invention is as follows:
A kind of flabbiness ground strengthened construction method, which comprises the steps of:
Step 1): construction processing is carried out to reinforcing area application draining concretion method is intended to；
Step 2): discharging consolidation operation is persistently carried out；
Step 3): silt soil strata detection sample, the compression system of detection silt soil strata detection sample are drilled through being intended to reinforcing area
Number a, as a >=0.1MPa-1When, carry out step 4)；As a < 0.1MPa-1When, it gos to step 2)；
Step 4): cement mixing pile driving construction is carried out to reinforcing area is intended to.
Further, the step 1) includes the process successively carried out as follows:
Process a): leveling is intended to reinforcing area, is laid with sand bedding course, makes the road camber shape that sand bedding course top surface is high in centre, two sides are low,
Its gradient is 3-4%；
Process b): it is being intended to reinforcing area, is opening up to uniformly dispersing injected hole (1)；In injected hole (1), surrounding sets drainage element
(2)；
Process c): carrying out fracture grouting to injected hole (1) with mini-valve tube, applies to the muck soil for being intended to reinforcing area and squeezes
Stress makes the moisture in silt soil strata penetrate into drainage element (2) discharge upwards afterwards.
Further, step 3) is to drill through silt soil strata detection sample being intended to reinforcing area, detection silt soil strata detects sample
Compressed coefficient a, as a >=0.1MPa-1And a < 0.5MPa-1When, carry out step 4)；As a < 0.1MPa-1When, it gos to step
2)。
Further, in step 3), the sampling process of the silt soil strata detection sample are as follows: be intended to reinforcing area drill sampling
Hole, sampling hole depth are silt soil strata thickness, obtain the soil body in the sampling hole, intercept top in the sampling hole,
The soil body of middle part and lower part detects sample as silt soil strata.
Further, the sampling hole is uniformly distributed in desire reinforcing area, and quantity determines method are as follows: injected hole (1)
The result round that is obtained multiplied by 3% of quantity obtain Integer n；If n > 3, sampling hole number is n；If n≤3,
Sampling hole number is 3.
Further, which is characterized in that in process a), the sand bedding course (5) uses medium coarse sand, and sand bedding course is with a thickness of 50-
60cm。
Further, which is characterized in that in process b), drainage element (2) insertion depth is to penetrate silt soil strata
Subject to 50cm.
Further, the drainage element (2) is water-drainage tube part comprising,
Steel water discharge pipe (6), lower end is tapered, and the side wall of steel water discharge pipe (6), which gathers, offers permeable hole (7)；
The inner sidewall in the steel water discharge pipe (6) is arranged in plastic blind-ditch (8)；
Geotextiles (9) are arranged between the steel water discharge pipe (6) and plastic blind-ditch (8).
Further, in step 4), the stake bottom of cement mixing pile (4) is set to boulder bed as supporting course.
Further, in process c), slurry content used in fracture grouting is 1 mass parts water, 1 mass parts cement, 0.7
Mass parts flyash and 0.03~0.05 mass parts waterglass.
Further, the square grid arrangement of the injected hole (1), injected hole (1) are located at four angle points of square
On, drainage element (2) is located at the center position of square.
Technical effect obtained by the present invention:
1. draining concretion method combination cement mixing pile driving construction reinforces soft foundation, on the one hand, overcome merely according to
The problem of constructing brought long construction period by draining concretion method；On the other hand, it overcomes and is applied by cement mixing pile merely
The broken pile problem that work bring mixing pile easily occurs by the flowing of silt soil strata.
2. coming to nothing after traditional sluice foundation construction once there is sluice foundation, needs to bore empty bottom plate again and carries out slip casting,
Present invention indwelling steel water-drainage tube part in mud, it is ensured that slurries can be by drainpipe to entire during later period slip casting
Mud is reinforced, and is solved the problems, such as that sluice foundation comes to nothing and is needed to carry out deep drilling slip casting.
3. water-drainage tube part indwelling forms skeleton in muck soil, reaches reinforcing soft ground when using water-drainage tube part
Purpose enhances foundation stability.
Detailed description of the invention
Fig. 1 is injected hole, drainage element and cement mixing pile distribution schematic diagram；
Fig. 2 is injected hole and drainage element distribution schematic diagram；
Fig. 3 is that fracture grouting acts on lower drainage principle figure；
Fig. 4 is drainpipe schematic diagram；
Fig. 5 is the structural schematic diagram of drainpipe；
Fig. 6 is Treatment Methods of Soft Ground schematic diagram.
Appended drawing reference: 1- injected hole, 2- drainage element, 3- slip casting sphere of action line, 4- cement mixing pile, 5- sand bedding course, 6-
Steel water discharge pipe, 7- permeable hole, 8- plastic blind-ditch, 9- geotextiles.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to this experiment
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
A kind of flabbiness ground strengthened construction method, includes the following steps:
Step 1): construction processing is carried out to reinforcing area application draining concretion method is intended to；
Step 2): discharging consolidation operation is persistently carried out；
Step 3): silt soil strata detection sample, the compression system of detection silt soil strata detection sample are drilled through being intended to reinforcing area
Number a, as a >=0.1MPa-1When, carry out step 4)；As a < 0.1MPa-1When, it gos to step 2)；
Step 4): cement mixing pile driving construction is carried out to reinforcing area is intended to.
The method of the present invention reinforces draining concretion method combination cement mixing pile driving construction to soft foundation, on the one hand, gram
The problem of having taken simple long construction period brought by draining concretion method construction, as a >=0.1MPa-1When can carry out cement
Mixing pile construction；On the other hand, it overcomes merely by cement mixing pile driving construction bring mixing pile easily because of silt soil strata
The broken pile problem for flowing and occurring, sleeve valve barrel grouting before change the chemical component and physico-mechanical properties of the soil body, improve
Soil strength, as a >=0.1MPa-1When, the mobility of silt soil strata significantly reduces, and is unlikely to flow and make cement mixing pile
Broken pile.
The step 1) includes the process successively carried out as follows:
Process a): leveling is intended to reinforcing area, is laid with sand bedding course, makes the road camber shape that sand bedding course top surface is high in centre, two sides are low,
Its gradient is 3-4%；
Process b): it is being intended to reinforcing area, is opening up to uniformly dispersing injected hole (1)；In injected hole (1), surrounding sets drainage element
(2)；
Process c): carrying out fracture grouting to injected hole (1) with mini-valve tube, applies to the muck soil for being intended to reinforcing area and squeezes
Stress makes the moisture in silt soil strata penetrate into drainage element (2) discharge upwards afterwards.
Fig. 1 illustrates the point distribution situation of injected hole 1, drainage element 2 and cement mixing pile 4, Fig. 2 illustrates injected hole 1
With 2 distribution situation of drainage element, injected hole 1 is interspersed with drainage element 2, the cement mixing pile 4 set later also with injected hole 1,
Drainage element 2 is interspersed.Fig. 3 illustrates fracture grouting and acts on lower drainage principle, by being cleaved with mini-valve tube to injected hole 1
Slip casting applies extrusion stress to the muck soil for being intended to reinforcing area, penetrates into the moisture in silt soil strata after drainage element 2 upwards
Discharge improves drainage efficiency.
Step 3) is to drill through silt soil strata in desire reinforcing area to detect sample, the compression system of detection silt soil strata detection sample
Number a, as a >=0.1MPa-1And a < 0.5MPa-1When, carry out step 4)；As a < 0.1MPa-1When, it gos to step 2).
Discharging consolidation process is not necessarily to carry out always as reinforcing by draining concretion method merely tradition
Shortening construction period can detect the compressed coefficient a of sample in silt soil strata, as a >=0.1MPa-1And a < 0.5MPa-1When,
Cement mixing pile driving construction is carried out, silt soil strata mobility is little at this time, is not enough to flow and make cement mixing pile broken pile.
In step 3), the sampling process of the silt soil strata detection sample are as follows: be intended to reinforcing area drilling the sampling holes, sampling hole
Depth is silt soil strata thickness, obtains the soil body in the sampling hole, intercepts the upper, middle and lower in the sampling hole
The soil body as silt soil strata detect sample.
The sampling hole is uniformly distributed in desire reinforcing area, and quantity determines method are as follows: the quantity of injected hole (1) multiplied by
3% obtained result round obtains Integer n；If n > 3, sampling hole number is n；If n≤3 sample hole number
It is 3.
Sample position is evenly distributed as much as possible, and takes the silt soil strata of different depth to detect sample, so as to muck soil laminar flow
The judgement of dynamic property is more accurate, when all silt soil strata detection samples are all satisfied the compressed coefficient more than or equal to 0.1MPa-1When, i.e.,
Can cement be stirred pile driving construction.
In process a), the sand bedding course (5) uses medium coarse sand, and sand bedding course is with a thickness of 50-60cm.
In process b), drainage element (2) insertion depth, which is subject to, penetrates silt soil strata 50cm.
The drainage element (2) is water-drainage tube part comprising,
Steel water discharge pipe (6), lower end is tapered, and the side wall of steel water discharge pipe (6), which gathers, offers permeable hole (7)；
The inner sidewall in the steel water discharge pipe (6) is arranged in plastic blind-ditch (8)；
Geotextiles (9) are arranged between the steel water discharge pipe (6) and plastic blind-ditch (8).
It is the structural schematic diagram of drainpipe that Fig. 4, which is drainpipe schematic diagram, Fig. 5,.Geotextiles (9) wrap plastic blind-ditch (8),
Filtration prevents mud from entering and forms blocking in pipe.After the completion of discharging consolidation, water-drainage tube part indwelling is in desire reinforcing area
In, skeleton is formed, achievees the purpose that reinforcing soft ground, enhances foundation stability.
In step 4), the stake bottom of cement mixing pile (4) is set to boulder bed as supporting course.As shown in Figure 6.
In process c), slurry content used in fracture grouting is 1 mass parts water, 1 mass parts cement, 0.7 mass parts fine coal
Ash and 0.03~0.05 mass parts waterglass.
The square grid arrangement of the injected hole (1), injected hole (1) are located on four angle points of square, drainage element
(2) it is located at the center position of square.Adjacent slip casting pitch of holes can be set as 1.5 meters.
The depth of the fracture grouting is each super note 40cm in top and bottom, operating radius 1m of silt soil strata.
As shown, in step 4), when carrying out cement mixing pile driving construction, in the injected hole for being intended to reinforcing area outermost
(1) on the blockade line being linked to be, cement mixing pile is intensively set；In blockade line, cement mixing pile is set with being evenly arranged.Closing
Cement mixing pile on line is intended to reinforcing area and separates with outside, forms protective layer.
Claims (10)
1. a kind of flabbiness ground strengthened construction method, which comprises the steps of:
Step 1): construction processing is carried out to reinforcing area application draining concretion method is intended to；
Step 2): discharging consolidation operation is persistently carried out；
Step 3): drilling through silt soil strata detection sample being intended to reinforcing area, and detection silt soil strata detects the compressed coefficient a of sample,
As a >=0.1MPa-1When, carry out step 4)；As a < 0.1MPa-1When, it gos to step 2)；
Step 4): cement mixing pile driving construction is carried out to reinforcing area is intended to.
2. flabbiness ground strengthened construction method according to claim 1, which is characterized in that the step 1) includes as follows
The process successively carried out:
Process a): leveling is intended to reinforcing area, is laid with sand bedding course, makes sand bedding course top surface in intermediate road camber shape high, two sides are low, slope
Degree is 3-4%；
Process b): it is being intended to reinforcing area, is opening up to uniformly dispersing injected hole (1)；In injected hole (1), surrounding sets drainage element (2)；
Process c): carrying out fracture grouting to injected hole (1) with mini-valve tube, applies to squeeze to the muck soil for being intended to reinforcing area and answer
Power makes the moisture in silt soil strata penetrate into drainage element (2) discharge upwards afterwards.
3. flabbiness ground strengthened construction method according to claim 1, which is characterized in that step 3) is to be intended to stabilization zone
Domain drills through silt soil strata detection sample, the compressed coefficient a of detection silt soil strata detection sample, as a >=0.1MPa-1And a <
0.5MPa-1When, carry out step 4)；As a < 0.1MPa-1When, it gos to step 2).
4. flabbiness ground strengthened construction method as claimed in any of claims 1 to 3, which is characterized in that step 3)
In, the sampling process of the silt soil strata detection sample are as follows: be intended to reinforcing area drilling the sampling holes, sampling hole depth is muck soil
Thickness degree obtains the soil body in the sampling hole, intercepts the soil body of the upper, middle and lower in the sampling hole as mud
Matter soil layer detects sample.
5. flabbiness ground strengthened construction method according to claim 4, which is characterized in that the sampling hole is uniformly distributed in
It is intended to reinforcing area, quantity determines method are as follows: the result round that the quantity of injected hole (1) is obtained multiplied by 3% is obtained
To Integer n；If n > 3, sampling hole number is n；If n≤3, sampling hole number is 3.
6. flabbiness ground strengthened construction method according to claim 2, which is characterized in that in process b), the drainage element
(2) insertion depth, which is subject to, penetrates silt soil strata 50cm.
7. flabbiness ground strengthened construction method according to claim 2, which is characterized in that the drainage element (2) is draining
Pipe fitting comprising,
Steel water discharge pipe (6), lower end is tapered, and the side wall of steel water discharge pipe (6), which gathers, offers permeable hole (7)；
The inner sidewall in the steel water discharge pipe (6) is arranged in plastic blind-ditch (8)；
Geotextiles (9) are arranged between the steel water discharge pipe (6) and plastic blind-ditch (8).
8. flabbiness ground strengthened construction method according to claim 2, which is characterized in that in step 4), cement mixing pile
(4) stake bottom is set to boulder bed as supporting course.
9. flabbiness ground strengthened construction method according to claim 2, which is characterized in that in process c), fracture grouting institute
Slurry content is 1 mass parts water, 1 mass parts cement, 0.7 mass parts flyash and 0.03~0.05 mass parts waterglass.
10. flabbiness ground strengthened construction method according to claim 2, which is characterized in that the injected hole (1) is in pros
Shape grid arrangement, injected hole (1) are located on four angle points of square, and drainage element (2) is located at the center position of square.
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| CN201910680025.3A CN110485408A (en) | 2019-07-26 | 2019-07-26 | A kind of soft foundation reinforcing method |
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| CN201910680025.3A CN110485408A (en) | 2019-07-26 | 2019-07-26 | A kind of soft foundation reinforcing method |
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ID=68548303
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Cited By (4)
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| CN111622207A (en) * | 2020-06-09 | 2020-09-04 | 广西路桥工程集团有限公司 | Induced grouting method |
| CN112343036A (en) * | 2020-12-03 | 2021-02-09 | 中电建路桥集团有限公司 | Construction method of vibroflotation gravel pile in collapsible loess area |
| CN113863276A (en) * | 2021-09-16 | 2021-12-31 | 国网河北省电力有限公司沧州供电分公司 | High-voltage tower foundation 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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| 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 |
| CN116025367B (en) * | 2022-10-28 | 2023-11-21 | 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: 20191122 |