CN113026711A - Fiber reinforced foam solidified soil hard shell layer foundation structure and construction method - Google Patents
Fiber reinforced foam solidified soil hard shell layer foundation structure and construction method Download PDFInfo
- Publication number
- CN113026711A CN113026711A CN202110261756.1A CN202110261756A CN113026711A CN 113026711 A CN113026711 A CN 113026711A CN 202110261756 A CN202110261756 A CN 202110261756A CN 113026711 A CN113026711 A CN 113026711A
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- layer
- solidified soil
- crust
- foundation
- fiber reinforced
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- 239000002689 soil Substances 0.000 title claims abstract description 82
- 239000000835 fiber Substances 0.000 title claims abstract description 79
- 239000006260 foam Substances 0.000 title claims abstract description 47
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000004088 foaming agent Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 210000003205 muscle Anatomy 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- -1 and meanwhile Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- 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)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Foundations (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a fiber reinforced foam solidified soil hard shell layer foundation structure and a construction method thereof. The invention improves the bearing capacity of the soft soil foundation and reduces the additional stress and the settlement deformation of the lower horizontal layer; the additional stress in the foundation can be reduced, so that the bearing capacity of the foundation is improved; simple construction, environmental protection and good economical efficiency.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a fiber reinforced foam solidified soil crust layer foundation structure and a construction method thereof.
Background
In the construction of roads, ports, wharfs and citizens, mud ponds and ultra-soft soil foundations are frequently encountered, the traditional foundation treatment is usually through foundation treatment measures such as replacement filling, dynamic compaction and composite foundations, the above measures have poor effect on settlement control, particularly for backfill problems, backfill load and upper load effect increase additional stress of the lower lying foundation, and later settlement is larger. The composite foundation with the rigid piles with better settlement control has poor economy and can not exert the advantages of the rigid piles, so that a foundation treatment technology with light weight and good stress transmission effect is urgently needed.
The invention provides a fiber reinforced foam solidified soil crust layer foundation treatment technology, wherein the foundation treatment material used in the technology is fiber reinforced foam solidified soil, and the technology has the following characteristics: the light foam solidified soil has low density, can greatly reduce the additional stress in the soil body, improves the bearing capacity of the foundation and effectively controls the settlement deformation of the foundation; the light hard shell layer has higher strength and plays a good role in stress diffusion; the stress transmission effect is good, so that the bearing capacity of the foundation is higher, and the cost performance is better.
Disclosure of Invention
The invention aims to solve the technical problems that aiming at the defects in the prior art, the invention provides a fiber reinforced foam solidified soil hard shell layer foundation structure and a construction method thereof, which improve the bearing capacity of a soft soil foundation and reduce the additional stress and settlement deformation of a lower horizontal layer; the additional stress in the foundation can be reduced, so that the bearing capacity of the foundation is improved; simple construction, environmental protection and good economical efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a fibre adds muscle foam solidified soil crust layer foundation structure, includes mattress pad layer, fibre adds muscle foam solidified soil and crust layer, and geogrid and mattress pad layer have been laid in proper order to the upper surface of crust layer, and the crust layer is buried underground in soft soil foundation, and fibre adds muscle foam solidified soil and sets up in the crust layer.
According to the technical scheme, an embankment is arranged above the geogrid.
According to the technical scheme, the hard shell layer is an integral hard shell layer or a plurality of fiber solidified mounds; the covering surface of the integral hard shell layer is larger than the mattress layer and the area of the foam soil embankment 1 on the mattress layer, and the fiber solidified soil piers are uniformly distributed at the bottom of the mattress layer at intervals.
According to the technical scheme, the thickness of the integral hard shell layer is 3-5 m, the length of the fiber curing mound is 5-8 m, and the diameter of the fiber curing mound is 0.8-1.2 m.
According to the technical scheme, the fiber reinforced foam solidified soil is formed by mixing fibers, a foaming agent and a curing agent.
According to the technical scheme, the fibers are polyester fibers.
According to the technical scheme, the length of the fiber is 30-100 mm.
The construction method for the fiber reinforced foam solidified soil hard shell layer foundation structure comprises the following steps:
1) when the hard shell layer is an integral hard shell layer, excavating a foundation pit according to the thickness of the integral hard shell layer, and when the hard shell layer is a plurality of fiber solidified piers, drilling a steel sleeve on the soft soil foundation according to the position of each fiber solidified pier;
2) when the crust layer is an integral crust layer, waterproof geosynthetic materials are laid at the bottom and around the foundation pit,
when the hard shell layer is a plurality of fiber solidified soil piers, placing waterproof reinforced geosynthetic sleeves into the drilled holes in the steel sleeves;
3) pouring fiber reinforced foam solidified soil into the foundation pit or the geosynthetic sleeve, and maintaining to the designed strength;
4) sequentially laying a geogrid and a broken stone mattress layer on the upper surface of the hard shell layer; the geogrid is laid on the lower surface of the gravel cushion layer or on the upper surface and the lower surface of the gravel cushion layer;
5) and carrying out embankment structure construction on the mattress layer.
According to the technical scheme, in the step 5), the embankment is made of foam light soil.
In the step 3), the fiber reinforced foam solidified soil is formed by mixing fibers, a foaming agent and a curing agent, and the content and the proportion of the fibers, the foaming agent and the curing agent are determined according to the bearing capacity requirement of the foundation.
The invention has the following beneficial effects:
the fiber reinforced foam solidified soil is light and high in strength, and the bearing capacity of a soft soil foundation is improved; the hard shell layer has the function of stress diffusion, and reduces the additional stress and the settlement deformation of the lower lying layer; the density of the foamed light solidified soil is less than that of water, so that the additional stress in the foundation can be reduced, and the bearing capacity of the foundation can be improved; simple construction, environmental protection and good economical efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a fiber reinforced foam solidified soil crust layer foundation structure in one embodiment of the invention;
FIG. 2 is a schematic structural diagram of a fiber reinforced foam solidified soil crust layer foundation structure in a second embodiment of the invention;
in the figure, 1-foam soil embankment, 2-mattress layer, 3-geogrid, 4-fiber reinforced foam solidified soil, 5-waterproof geosynthetic material, 6-soft soil foundation, 7-waterproof reinforced geosynthetic material sleeve and 8-fiber solidified soil pier.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, the fiber reinforced foam solidified soil hard shell layer foundation structure in the first embodiment of the invention includes a mattress layer 2, fiber reinforced foam solidified soil 4 and a hard shell layer, wherein a geogrid 3 and the mattress layer 2 are sequentially laid on the upper surface of the hard shell layer, the hard shell layer is buried in a soft soil foundation 6, the fiber reinforced foam solidified soil 4 is filled in the hard shell layer, and the geogrid 3 and the mattress layer 2 are laid on the ground of the soft soil foundation 6.
Further, an embankment is arranged above the geogrid 3, and the embankment is a foam soil embankment 1.
Further, the hard shell layer is an integral hard shell layer; the covering surface of the integral hard shell layer is larger than the area of the mattress layer 2 and the area of the foam soil embankment 1 on the mattress layer, and the thickness of the integral hard shell layer is 3-5 m.
Further, the fiber reinforced foam solidified soil 4 is formed by mixing fibers, a foaming agent and a curing agent, and the fibers play a reinforcement role.
Further, the fibers are polyester fibers; the fiber can be artificial, biological, synthetic, wheat straw and other fibers with the strength meeting the requirement.
Further, the fiber length is 30mm to 100 mm.
As shown in fig. 2, the second embodiment of the present invention is different from the first embodiment in that: the crust layer is a plurality of fiber solidified soil piers 8 to form a pier soil composite crust layer, the fiber solidified soil piers 8 are uniformly distributed at the bottom of the mattress layer 2 at intervals, the length of the fiber solidified soil piers 8 is 5-8 m, the diameter of the fiber solidified soil piers 8 is 0.8-1.2 m, and the rest structures of the second embodiment are the same as those of the first embodiment.
The construction method for the fiber reinforced foam solidified soil hard shell layer foundation structure comprises the following steps:
1) determining the thickness of a hard shell layer according to design, determining the solidification depth of a soil body or the pier length of a solidified soil pier, excavating a foundation pit according to the thickness of the integral hard shell layer when the hard shell layer is the integral hard shell layer, and drilling a steel sleeve on a soft soil foundation 6 according to the position of each fiber solidified soil pier 8 when the hard shell layer is a plurality of fiber solidified soil piers 8;
2) when the crust layer is an integral crust layer, waterproof geosynthetic material 5 is laid at the bottom and around the foundation pit,
when the crust layer is a plurality of fiber solidified soil piers 8, putting waterproof reinforced geosynthetic sleeves 7 into the drilled holes in the steel sleeves;
3) pouring fiber reinforced foam solidified soil 4 into the foundation pit or the geosynthetic sleeve, and maintaining to the designed strength;
4) laying a layer of geogrid 3 on the upper surface of the hard shell layer, and laying a broken stone mattress layer 2; the geogrid 3 is paved on the lower surface of the gravel cushion layer 2 or on the upper surface and the lower surface of the gravel cushion layer 2;
5) and (4) carrying out embankment structure construction on the mattress layer 2.
Further, in the step 5), the embankment is made of foam light soil.
In the step 3), the fiber reinforced foam solidified soil 4 is formed by mixing fibers, a foaming agent and a curing agent, and the content and the proportion of the fibers, the foaming agent and the curing agent are determined according to the bearing capacity requirement of the foundation.
The foundation treatment material is fiber reinforced foam solidified soil 4, and the technology has the following characteristics: the light foam solidified soil has low density, can greatly reduce the additional stress in the soil body, improves the bearing capacity of the foundation and effectively controls the settlement deformation of the foundation; the light hard shell layer has higher strength and plays a good role in stress diffusion; the stress transmission effect is good, so that the bearing capacity of the foundation is higher, and the cost performance is better.
In conclusion, the hard shell layer formed by curing the soil body by adopting the fiber light foam curing agent has higher strength; the hard shell layer has small mass, can reduce additional stress in the foundation, and has certain burial depth, so that the bearing capacity of the foundation is improved; sedimentation can be effectively controlled; the solidified soil is made of local materials, and meanwhile, solid waste materials such as engineering construction residue soil and the like can be consumed, so that the solid waste resource utilization is realized, and the social and economic benefits are higher.
The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.
Claims (9)
1. The utility model provides a fibre adds muscle foam solidified soil crust layer foundation structure which characterized in that, includes mattress pad layer, fibre adds muscle foam solidified soil and crust layer, and geogrid and mattress pad layer have been laid in proper order to the upper surface of crust layer, and the crust layer is buried underground in the soft soil foundation, and fibre adds muscle foam solidified soil and sets up in the crust layer.
2. The fiber reinforced foam solidified soil crust base structure according to claim 1, wherein an embankment is disposed above the geogrid.
3. The fiber reinforced foam solidified soil crust layer foundation structure of claim 1, wherein the crust layer is an integral crust layer or a plurality of fiber solidified soil piers.
4. The fiber reinforced foam solidified soil crust layer foundation structure of claim 3, wherein the thickness of the integral crust layer is 3-5 m, the length of the fiber solidified soil pier is 5-8 m, and the diameter of the fiber solidified soil pier is 0.8-1.2 m.
5. The fiber reinforced foam solidified soil crust foundation structure of claim 1, wherein the fiber reinforced foam solidified soil is formed by mixing fibers, a foaming agent and a curing agent.
6. The fiber reinforced foam solidified soil crust foundation structure of claim 5, wherein the fibers are polyester fibers.
7. The fiber reinforced foam solidified soil crust foundation structure of claim 5, wherein the fiber length is 30mm to 100 mm.
8. The construction method of the fiber reinforced foam solidified soil crust layer foundation structure according to claim 1 is characterized by comprising the following steps:
1) when the hard shell layer is an integral hard shell layer, excavating a foundation pit according to the thickness of the integral hard shell layer, and when the hard shell layer is a plurality of fiber solidified piers, drilling a steel sleeve on the soft soil foundation according to the position of each fiber solidified pier;
2) when the crust layer is an integral crust layer, waterproof geosynthetic materials are laid at the bottom and around the foundation pit,
when the hard shell layer is a plurality of fiber solidified soil piers, placing waterproof reinforced geosynthetic sleeves into the drilled holes in the steel sleeves;
3) pouring fiber reinforced foam solidified soil into the foundation pit or the geosynthetic sleeve, and maintaining to the designed strength;
4) sequentially laying a geogrid and a broken stone mattress layer on the upper surface of the hard shell layer;
5) and carrying out embankment structure construction on the mattress layer.
9. The construction method according to claim 8, wherein in the step 5), the embankment is made of foamed light soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110261756.1A CN113026711A (en) | 2021-03-10 | 2021-03-10 | Fiber reinforced foam solidified soil hard shell layer foundation structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110261756.1A CN113026711A (en) | 2021-03-10 | 2021-03-10 | Fiber reinforced foam solidified soil hard shell layer foundation structure and construction method |
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| Publication Number | Publication Date |
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| CN113026711A true CN113026711A (en) | 2021-06-25 |
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| CN202110261756.1A Pending CN113026711A (en) | 2021-03-10 | 2021-03-10 | Fiber reinforced foam solidified soil hard shell layer foundation structure and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1448370A (en) * | 2003-05-07 | 2003-10-15 | 河海大学 | Air bubble mixed light-weight earth and production method thereof |
| CN102505598A (en) * | 2011-10-09 | 2012-06-20 | 中铁六局集团有限公司 | Method for reinforcement construction of soft soil foundation by exchange-filling with foam lightweight soil |
| CN102704462A (en) * | 2012-06-28 | 2012-10-03 | 中铁十六局集团第五工程有限公司 | Composite treatment grouped piles for soft foundation |
| CN102797208A (en) * | 2012-08-15 | 2012-11-28 | 广东冠生土木工程技术有限公司 | Method for filling deep soft foundation zero additional load bubble mixed lightweight soil subgrade |
| CN104358196A (en) * | 2014-10-11 | 2015-02-18 | 杭州江润科技有限公司 | Construction method for embankment settlement treatment structure of road open to traffic |
| WO2016028234A1 (en) * | 2014-08-19 | 2016-02-25 | Scherfel Valter | Subbase layer and method of its realization |
| CN107419630A (en) * | 2017-06-13 | 2017-12-01 | 华中科技大学 | A kind of the soft soil foundation high-filled embankment and construction method of effectively control settlement after construction |
| CN109914161A (en) * | 2019-04-11 | 2019-06-21 | 中铁第六勘察设计院集团有限公司 | A kind of construction method of soft clay area high-speed railway filled-up ground |
| CN111395312A (en) * | 2020-03-23 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Composite light pile structure, manufacturing method, construction method and pile splicing method |
| CN211645809U (en) * | 2019-12-25 | 2020-10-09 | 广东泰禾建设有限公司 | Bridge platform back foam light soil roadbed structure |
-
2021
- 2021-03-10 CN CN202110261756.1A patent/CN113026711A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1448370A (en) * | 2003-05-07 | 2003-10-15 | 河海大学 | Air bubble mixed light-weight earth and production method thereof |
| CN102505598A (en) * | 2011-10-09 | 2012-06-20 | 中铁六局集团有限公司 | Method for reinforcement construction of soft soil foundation by exchange-filling with foam lightweight soil |
| CN102704462A (en) * | 2012-06-28 | 2012-10-03 | 中铁十六局集团第五工程有限公司 | Composite treatment grouped piles for soft foundation |
| CN102797208A (en) * | 2012-08-15 | 2012-11-28 | 广东冠生土木工程技术有限公司 | Method for filling deep soft foundation zero additional load bubble mixed lightweight soil subgrade |
| WO2016028234A1 (en) * | 2014-08-19 | 2016-02-25 | Scherfel Valter | Subbase layer and method of its realization |
| CN104358196A (en) * | 2014-10-11 | 2015-02-18 | 杭州江润科技有限公司 | Construction method for embankment settlement treatment structure of road open to traffic |
| CN107419630A (en) * | 2017-06-13 | 2017-12-01 | 华中科技大学 | A kind of the soft soil foundation high-filled embankment and construction method of effectively control settlement after construction |
| CN109914161A (en) * | 2019-04-11 | 2019-06-21 | 中铁第六勘察设计院集团有限公司 | A kind of construction method of soft clay area high-speed railway filled-up ground |
| CN211645809U (en) * | 2019-12-25 | 2020-10-09 | 广东泰禾建设有限公司 | Bridge platform back foam light soil roadbed structure |
| CN111395312A (en) * | 2020-03-23 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Composite light pile structure, manufacturing method, construction method and pile splicing method |
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