CN110886287A - Shallow soft soil foundation curing structure and construction method thereof - Google Patents
Shallow soft soil foundation curing structure and construction method thereof Download PDFInfo
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- CN110886287A CN110886287A CN201910931217.7A CN201910931217A CN110886287A CN 110886287 A CN110886287 A CN 110886287A CN 201910931217 A CN201910931217 A CN 201910931217A CN 110886287 A CN110886287 A CN 110886287A
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- 239000002689 soil Substances 0.000 title claims abstract description 61
- 238000010276 construction Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 104
- 239000003795 chemical substances by application Substances 0.000 claims description 40
- 238000005096 rolling process Methods 0.000 claims description 23
- 238000011065 in-situ storage Methods 0.000 claims description 22
- 238000007711 solidification Methods 0.000 claims description 22
- 230000008023 solidification Effects 0.000 claims description 22
- 238000005507 spraying Methods 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 8
- 238000003801 milling Methods 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000007596 consolidation process Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000004746 geotextile Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 208000004350 Strabismus Diseases 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000000227 grinding Methods 0.000 description 1
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- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
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- 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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- 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
- E02D3/123—Consolidating by placing solidifying or pore-filling substances in the soil and compacting the soil
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- Agronomy & Crop Science (AREA)
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Abstract
The invention discloses a shallow soft soil foundation curing structure which comprises a shallow curing body arranged below the original mud surface of a beach shallow layer, wherein a deep replacing body is arranged at the bottom of the shallow curing body, and an anti-skid wall used for preventing the shallow curing body from sliding is arranged at the edge of the shallow curing body. The invention also provides a construction method of the shallow curing body, the anti-skid wall and the deep displacing body in the shallow soft soil foundation curing structure, and the invention has the beneficial effects that: the process can use local materials, can fully utilize on-site weak silt or mucky soil, has low manufacturing cost and environmental protection and ecology, and can be widely applied to the fields of dams, roads, wharfs, storage yards, underground continuous walls, cement mixing piles and the like.
Description
Technical Field
The invention relates to the field of water conservancy and water transportation and coastal ocean engineering, in particular to a shallow soft soil foundation curing structure and a construction method thereof.
Background
The soft soil has the characteristics of high water content, high compressibility, low mechanical strength and the like, and particularly, the sludge or mucky soil in a flow plastic state is a soil layer which needs to be heavily treated in engineering. For the soft soil foundation, the common treatment methods at present include a drainage consolidation method, a replacement method, a pile foundation method and the like.
The drainage consolidation method is to set drainage channels in the soil body, shorten the drainage path of the foundation soil, and accelerate the drainage consolidation speed of the soil body by utilizing the self weight or the pre-pressing load, thereby achieving the purpose of increasing the strength of the foundation soil. The method is widely applied in engineering, is an economic and effective foundation treatment method for deep soft soil foundation, and obtains better inspection from theory and practice. However, the drainage consolidation method is disadvantageous in that the treatment period of the foundation is long and the sedimentation amount is large, so that deformation is controlled.
The replacement method is to replace partial or all weak soil in natural foundation with rock and soil material with excellent physical and mechanical properties, such as sand and stone, to form double-layer or composite foundation and to raise the bearing capacity of foundation and reduce deposition. However, this method generally requires a large amount of sand and stone.
The pile foundation method can fully utilize the combined action of bearing capacity of soil between piles by arranging the pile bodies in the foundation, and transmits partial load to the deep foundation, so that the whole bearing capacity of the foundation is improved. However, the pile body construction generally needs to adopt a vibration immersed tube pile driver, and has the defects of certain vibration and noise pollution and difficult penetration in thick sand layers and hard soil layers.
The soft soil solidification technology adopts special stirring equipment to fully mix the soft base sludge and the curing agent to form a solidified body, and the strength index of the solidified soil body is obviously improved.
At the present stage, the construction of the shallow solidification body under the shallow water condition can be realized, so that the implementation of the deep displacement body is convenient after the dry land construction condition is formed, the construction progress is accelerated, the quality of the deep displacement body is ensured, the structure fully utilizes the soft soil layer of the engineering site, the material consumption is saved, the excavation amount of the soil-free body is reduced, the working procedures are few, and the soft soil solidification structure and the construction mode with low manufacturing cost are not discovered yet and need to be developed.
Disclosure of Invention
The invention aims to provide a shallow soft soil foundation curing structure and a construction method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a shallow soft soil foundation solidification structure, is including setting up the shallow solidification body under the former mud face of beach shallow, shallow solidification body bottom is provided with the deep displacement body, shallow solidification body edge is provided with and is used for preventing the gliding non-skid wall of shallow solidification body.
The shallow solidified body is a combination of a plurality of monomers with the same strength or a plurality of monomers with different strengths. The deep displacement body is a plurality of solidified soil mixing piles or cement mixing piles, high-pressure jet grouting piles, concrete piles and steel pipe pile bodies.
A construction method of a shallow soft soil foundation curing structure comprises the following steps:
step S1, shallow layer solidified body construction:
step S101, site leveling and region division: carrying out field flattening lofting on an area to be subjected to curing treatment, dividing the area, and calculating the using amount of a curing agent according to the treatment depth and strength of the treated area;
step S102, selecting a double-wheel milling and stirring device to uniformly stir the in-situ soil of the flat and divided area of the field in the step S101: the method comprises the following steps of stirring in-situ soil by vertically stirring and curing, wherein a stirring device is in a direct insertion mode, the stirring device is operated in a forward direction to gradually go deep and descend for stirring and spraying a curing agent until the bottom of a curing design is reached, and then the stirring device is operated in a reverse direction to slowly lift for stirring and spraying the curing agent for curing and stirring;
step S103, rolling: after the curing and stirring are finished, rolling the surface by adopting a vibration type road roller from two sides to the center and from the lower part to the higher part, and performing secondary shaping after primary rolling;
step S104, repeating step S103 to complete the construction of the shallow solidification body;
step S2, construction of the anti-skid wall: selecting a buoyancy tank crawler excavator to be additionally provided with a double-wheel milling and stirring device, stirring in-situ sludge and simultaneously filling a curing agent, adopting a vertical up-down stirring and curing mode, directly inserting a stirring device into the tank to stir in-situ soil, gradually and deeply stirring and spraying the curing agent in a descending way when the stirring device operates in a forward direction until the curing design bottom is reached, then slowly lifting and stirring and spraying the curing agent when the stirring device operates in a reverse direction, and completing the construction of an anti-skid wall; step S3, construction of deep replacement body: a intertidal selective belt curing stirring pile machine, wherein the chassis adopts an assembled flat ship and is additionally provided with a single-shaft stirring pile machine, and a curing agent is added while a stirring head stirs sludge to form a pile; the unconfined compressive strength is more than 0.4MPa after 28 days of curing.
And S101, dividing the processing area into 3m by 3m to 6m by 6m, carrying out in-situ curing in a mode of curing while advancing, and avoiding missing stirring due to the fact that the overlapping width of each block is not less than 5 cm.
And S102, controlling the stirring lifting or descending speed to be 10-15S/m, and controlling the spraying speed of the curing agent to be 80-150 kg/min.
Step S103, rolling speed of the rolled road roller: the 1 st and 2 nd times are less than 1.5-1.7 km/h, the rolling speed of each side is less than 2.0-2.5 km/h, and the strength is more than 0.3MPa after 28 days of curing.
And step S1, the construction of the shallow solidified body is completed within the maximum delay time from the injection of the curing agent to the rolling of the in-situ cured layer.
The construction of the shallow solidified body is completed within 6h from the injection of the curing agent to the rolling.
And step S2, the stirring lifting or descending speed is controlled to be 10-15S/m, and the spraying speed of the curing agent is controlled to be 80-150 kg/min.
The invention has the beneficial effects that: the process can realize the construction of the shallow solidified body under the shallow water condition, thereby facilitating the implementation of the deep displacement body after the dry land construction condition is formed, being beneficial to accelerating the construction progress and ensuring the quality of the deep displacement body, fully utilizing the soft soil layer of the engineering site, saving materials, having no soil body excavation amount, having less working procedures and low manufacturing cost.
Drawings
Fig. 1 is a schematic view of a shallow soft soil foundation solidification structure according to the present invention.
In the figure:
1. shallow layer solidified body
2. Anti-skid wall
3. Deep replacement body
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in fig. 1, the shallow soft soil foundation curing structure comprises a shallow curing body 1 arranged below the original mud surface of the shallow layer of the beach, the bottom of the shallow curing body 1 and a deep displacement body 3 can be cured and connected into a whole or can be freely overlapped, an anti-skid wall 2 for preventing the shallow curing body 1 from sliding is arranged at the edge of the shallow curing body 1, and the shallow curing body 1 and the anti-skid wall 2 are integrally formed.
The deep displacement body 3 is a plurality of solidified soil mixing piles or cement mixing piles or high-pressure jet grouting piles or concrete piles or steel pipe pile bodies, the depth range is determined according to the thickness of a soft soil layer to be processed or the stress requirement of an upper structure, and the depth range can be 5m-50 m.
The shallow solidified body 1 is a combination of a plurality of monomers with the same strength or a plurality of monomers with different strengths. The strength of the shallow solidified body 1 can reach 0.1-25 MPa, and the monomers with different strengths can be geotextile bag cloth or a reinforcing mesh structure.
The assembly is mainly solidified soil, and geotextile bags or reinforcing steel bar meshes are added in the assembly in layers; the combined body can also be of a lower part of solidified soil and an upper part of a concrete structure or a reinforced concrete structure.
A construction method of a shallow soft soil foundation curing structure comprises the following steps:
step S1, shallow layer solidified body construction:
step S101, site leveling and region division: carrying out field flattening lofting on an area to be subjected to curing treatment, dividing the area, and calculating the using amount of a curing agent according to the treatment thickness of the treatment area;
step S102, selecting a double-wheel milling and stirring device to uniformly stir the in-situ soil of the flat and divided area of the field in the step S101: the method comprises the following steps of stirring in-situ soil by vertically stirring and curing, wherein a stirring device is in a direct insertion mode, the stirring device is operated in a forward direction to gradually go deep and descend for stirring and spraying a curing agent until the bottom of a curing design is reached, and then the stirring device is operated in a reverse direction to slowly lift for stirring and spraying the curing agent for curing and stirring;
step S103, rolling: after the curing and stirring are finished, rolling the surface by adopting a vibration type road roller from two sides to the center and from the lower part to the higher part, and performing secondary shaping after primary rolling;
step S104, repeating step S103 to complete the construction of the shallow solidification body;
step S2, construction of the anti-skid wall: selecting a buoyancy tank crawler excavator to be additionally provided with a double-wheel milling and stirring device, stirring in-situ sludge and simultaneously filling a curing agent, adopting a vertical up-down stirring and curing mode, directly inserting a stirring device into the tank to stir in-situ soil, gradually and deeply stirring and spraying the curing agent in a descending way when the stirring device operates in a forward direction until the curing design bottom is reached, then slowly lifting and stirring and spraying the curing agent when the stirring device operates in a reverse direction, and completing the construction of an anti-skid wall;
step S3, construction of deep replacement body: a intertidal selective belt curing stirring pile machine, wherein the chassis adopts an assembled flat ship and is additionally provided with a single-shaft stirring pile machine, and a curing agent is added while a stirring head stirs sludge to form a pile; the unconfined compressive strength is more than 0.4MPa after 28 days of curing.
Examples
The shallow solidified body 1 is 30m wide and 5m thick, and the anti-skid wall 2 is 10m thick and 5m wide.
The deep layer displacement body 3 is 20m deep and 20m wide overall. The deep replacement body 3 is a cement mixing pile or a solidified soil mixing pile, the pile diameter is 1m, the cement mixing pile or the solidified soil mixing pile is in a regular triangle array, the pile spacing is 1.5m, and the cement mixing amount is 15%.
Above-mentioned structure can realize the construction of shallow layer solidification body under the shallow water condition to form the implementation of the deep replacement body of being convenient for behind the dry land construction condition, the setting of while non-slip wall 2 can effectively guarantee that shallow layer solidification body 1 can not take place to slide and squint, improves structural quality and overall structure's service life.
The concrete construction steps are as follows:
① floor leveling and zoning
Carrying out field flattening lofting on an area to be subjected to curing treatment and dividing the area into treatment areas with the size of about 5m × 5m generally, and calculating the using amount of a curing agent according to the treatment thickness of the treatment areas;
② shallow layer solidified body 1 construction
Uniformly stirring the in-situ soil by adopting a double-wheel milling and stirring device, constructing by adopting a vertical up-down stirring and curing mode, stirring the in-situ soil by directly inserting a stirring device, gradually stirring and spraying a curing agent by forward operation of the stirring device until the curing design bottom is reached, and then slowly lifting and stirring and spraying the curing agent by reverse operation of the stirring device;
the stirring lifting or descending speed is controlled to be 10-15s/m, and the spraying speed of the curing agent is controlled to be 80-150 kg/min;
in-situ curing is carried out in a mode of curing while propelling, the overlapping width of each block is not less than 5cm, stirring leakage is avoided, and the unconfined compressive strength is greater than 0.02MPa after 28-day curing;
③ grinding
After the curing and stirring are finished, rolling the surface by adopting a vibration type road roller, performing secondary shaping after primary pressing, and strictly forbidding any vehicle to enter in the shaping process;
the rolling speed of the road roller is as follows: the 1 st and 2 nd times are not more than 1.5-1.7 km/h, the later rolling speed is not more than 2.0-2.5 km/h, and the rolling is carried out from two sides to the center and from the lower part to the higher part;
in the rolling process, high filling and low filling are cut in time, and when the phenomena of 'spring', looseness, peeling and the like occur, measures are taken in time for treatment; the curing agent injection and rolling from the shallow curing body 1 construction are preferably completed within 6h, and when the conditions are difficult, the curing is completed within the maximum delay time of the initial setting of the in-situ curing treatment layer;
④ construction of antiskid wall 2
The method comprises the steps that a buoyancy tank crawler excavator is additionally provided with a double-wheel milling and stirring device, in-situ sludge is stirred, meanwhile, a curing agent is filled, the construction adopts a vertical up-down stirring and curing mode, stirring equipment is directly inserted to stir in-situ soil, the stirring equipment is operated forward and gradually goes deep into stirring and sprays the curing agent until the bottom of a curing design is reached, and then the stirring equipment is operated reversely to slowly lift stirring and spray the curing agent;
the stirring lifting or descending speed is controlled to be 10-15s/m, and the spraying speed of the curing agent is controlled to be 80-150 kg/min;
the strength is more than 0.3MPa after 28 days of health preservation;
⑤ construction of deep replacement body 3
The intertidal zone solidification stirring pile machine is characterized in that a chassis adopts an assembled flat ship, a single-shaft stirring pile machine is additionally arranged on the chassis, and a stirring head is used for stirring sludge and simultaneously filling a curing agent to form a pile; the unconfined compressive strength is more than 0.4MPa after 28 days of curing.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a shallow layer soft soil foundation solidification structure which characterized in that: including shallow solidification body (1), deep displacement body (3) and non-slip wall (2), shallow solidification body (1) edge is provided with and is used for preventing the gliding non-slip wall (2) of shallow solidification body (1), deep displacement body (3) set up in shallow solidification body (1) bottom.
2. The shallow soft soil foundation solidification structure of claim 1, wherein: the shallow solidified body (1) is a combination of a plurality of monomers with the same strength or a plurality of monomers with different strengths.
3. The shallow soft soil foundation solidification structure of claim 2, wherein: the deep replacement body (3) is a plurality of solidified soil mixing piles or cement mixing piles or high-pressure jet grouting piles or concrete piles or steel pipe pile bodies.
4. A construction method of the shallow soft soil foundation curing structure according to claim 1, comprising the following steps:
step S1, shallow layer solidified body construction:
step S101, site leveling and region division: carrying out field flattening lofting on an area to be subjected to curing treatment, dividing the area, and calculating the using amount of a curing agent according to the treatment depth and strength of the treated area;
step S102, selecting a double-wheel milling and stirring device to uniformly stir the in-situ soil of the flat and divided area of the field in the step S101: the method comprises the following steps of stirring in-situ soil by vertically stirring and curing, wherein a stirring device is in a direct insertion mode, the stirring device is operated in a forward direction to gradually go deep and descend for stirring and spraying a curing agent until the bottom of a curing design is reached, and then the stirring device is operated in a reverse direction to slowly lift for stirring and spraying the curing agent for curing and stirring;
step S103, rolling: after the curing and stirring are finished, rolling the surface by adopting a vibration type road roller from two sides to the center and from the lower part to the higher part, and performing secondary shaping after primary rolling;
step S104, repeating step S103 to complete the construction of the shallow solidification body;
step S2, construction of the anti-skid wall: selecting a buoyancy tank crawler excavator to be additionally provided with a double-wheel milling and stirring device, stirring in-situ sludge and simultaneously filling a curing agent, adopting a vertical up-down stirring and curing mode, directly inserting a stirring device into the tank to stir in-situ soil, gradually and deeply stirring and spraying the curing agent in a descending way when the stirring device operates in a forward direction until the curing design bottom is reached, then slowly lifting and stirring and spraying the curing agent when the stirring device operates in a reverse direction, and completing the construction of an anti-skid wall;
step S3, construction of deep replacement body: a intertidal selective belt curing stirring pile machine, wherein the chassis adopts an assembled flat ship and is additionally provided with a single-shaft stirring pile machine, and a curing agent is added while a stirring head stirs sludge to form a pile; the unconfined compressive strength is more than 0.4MPa after 28 days of curing.
5. The construction method of the shallow soft soil foundation curing structure according to claim 4, characterized in that: and S101, dividing the processing area into 3m by 3m to 6m by 6m, carrying out in-situ curing in a mode of curing while advancing, and avoiding missing stirring due to the fact that the overlapping width of each block is not less than 5 cm.
6. The construction method of the shallow soft soil foundation curing structure according to claim 4, characterized in that: and S102, controlling the stirring lifting or descending speed to be 10-15S/m, and controlling the spraying speed of the curing agent to be 80-150 kg/min.
7. The construction method of the shallow soft soil foundation curing structure according to claim 4, characterized in that: step S103, rolling speed of the rolled road roller: the 1 st and 2 nd times are less than 1.5-1.7 km/h, the rolling speed of each side is less than 2.0-2.5 km/h, and the strength is more than 0.3MPa after 28 days of curing.
8. The construction method of the shallow soft soil foundation curing structure according to claim 4, characterized in that: and step S1, finishing the construction of the shallow solidified body within the maximum delay time from the injection of the curing agent to the rolling of the in-situ curing treatment layer in initial setting.
9. The construction method of the shallow soft soil foundation curing structure according to claim 8, characterized in that: the construction of the shallow solidified body is completed within 6h from the injection of the curing agent to the rolling.
10. The construction method of the shallow soft soil foundation curing structure according to claim 4, characterized in that: and step S2, the stirring lifting or descending speed is controlled to be 10-15S/m, and the spraying speed of the curing agent is controlled to be 80-150 kg/min.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112695740A (en) * | 2020-12-29 | 2021-04-23 | 保利长大工程有限公司 | Shallow soft foundation strong in-situ curing treatment construction method |
| CN113186895A (en) * | 2021-03-19 | 2021-07-30 | 北京高能时代环境技术股份有限公司 | In-situ multidimensional curing construction method for large-depth sludge pond |
| CN113564977A (en) * | 2021-06-17 | 2021-10-29 | 上海市政工程设计研究总院（集团）有限公司 | Construction method of soft soil foundation with high water content |
| CN114508011A (en) * | 2022-01-13 | 2022-05-17 | 中国水利水电第七工程局有限公司 | A kind of pile-supported soft soil roadbed reinforcement structure and reinforcement method |
| CN119824880A (en) * | 2025-03-19 | 2025-04-15 | 中交第一航务工程局有限公司 | A rapid reinforcement construction method for deep and ultra-soft foundation |
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| CN113186895A (en) * | 2021-03-19 | 2021-07-30 | 北京高能时代环境技术股份有限公司 | In-situ multidimensional curing construction method for large-depth sludge pond |
| CN113564977A (en) * | 2021-06-17 | 2021-10-29 | 上海市政工程设计研究总院（集团）有限公司 | Construction method of soft soil foundation with high water content |
| CN113564977B (en) * | 2021-06-17 | 2024-08-23 | 上海市政工程设计研究总院（集团）有限公司 | Construction method of high-water-content soft soil foundation |
| CN114508011A (en) * | 2022-01-13 | 2022-05-17 | 中国水利水电第七工程局有限公司 | A kind of pile-supported soft soil roadbed reinforcement structure and reinforcement method |
| CN119824880A (en) * | 2025-03-19 | 2025-04-15 | 中交第一航务工程局有限公司 | A rapid reinforcement construction method for deep and ultra-soft foundation |
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