CN117051807A - Upper cushion layer structure for improving arch effect of composite foundation soil - Google Patents
Upper cushion layer structure for improving arch effect of composite foundation soil Download PDFInfo
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- CN117051807A CN117051807A CN202310757448.7A CN202310757448A CN117051807A CN 117051807 A CN117051807 A CN 117051807A CN 202310757448 A CN202310757448 A CN 202310757448A CN 117051807 A CN117051807 A CN 117051807A
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- geogrid
- cushion layer
- stone
- layer
- mesh
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- 239000002689 soil Substances 0.000 title claims abstract description 38
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 230000000694 effects Effects 0.000 title claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 67
- 239000002245 particle Substances 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims 2
- 239000008187 granular material Substances 0.000 abstract description 5
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 102100040428 Chitobiosyldiphosphodolichol beta-mannosyltransferase Human genes 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 244000173207 Phyllanthus amarus Species 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001483 mobilizing effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
-
- 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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0084—Geogrids
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of soft soil foundation treatment, and relates to an upper cushion layer structure for improving the arch effect of composite foundation soil, wherein the upper cushion layer structure comprises a first crushed stone cushion layer and an interlocking layer which are arranged in a stacked manner, and the upper cushion layer comprises a first block layer and a second block layer, wherein the first block layer is formed by stacking a first block layer and a second block layer, and the second block layer is formed by stacking a second block layer, and the third block layer is formed by stacking a third block: the embedded locking layer comprises a geogrid and a second stone cushion layer paved on the geogrid, the first stone cushion layer and the second stone cushion layer are graded stone, and the particle size distribution of the first stone cushion layer and the second stone cushion layer is D x The aperture of the mesh of the geogrid is d 1 And D is 50 ≤d 1 ≤2D 50 The occurrence of excessive broken stone granules is avoided from passing through the geogrid from meshes of the geogrid and falling into holes among pile bodies, the integrity and rigidity of the mattress cushion layer are improved, the stress diffusion angle is increased, the soil arch effect is enhanced, and the possibility of soil filling collapse of the upper part of the broken stone mattress cushion layer is reduced.
Description
Technical Field
The invention relates to the technical field of soft soil foundation treatment, in particular to an upper cushion layer structure for improving the arch effect of composite foundation soil.
Background
There are many situations in the engineering construction field where soft soil foundation treatment is required, such as roads, plateaus, yards, etc. Due to the difference of geological conditions, the soft soil foundation treatment methods are different, and for the sections with better geological conditions or shallower soft soil, a shallow layer reclamation method is often adopted, but for the deep silt or silt soft soil areas with poorer geological conditions, a preloading method, a vacuum preloading combined preloading method, a CFG pile composite foundation, a cement soil mixing pile composite foundation, a high-pressure jet grouting pile composite foundation, a rigid pile composite foundation and the like are adopted, and good effects are obtained.
In general, the composite foundation refers to that part of soil body in the natural foundation is solidified and reinforced or replaced to form a vertical reinforcement (pile body), and the reinforcement area consists of two parts of pile bodies and soil between piles, and load is shared together. Under the action of the flexible load of the filling soil, the pile body and the soil between piles distribute and jointly bear the load of the embankment through the soil arch effect to form the composite foundation.
The composite foundation is reinforced by arranging a gravel cushion layer on the upper part of the pile body as a drainage layer and arranging geogrids in the middle and lower parts of the gravel layer for reinforcement so as to reduce the uneven settlement of the foundation. However, in the conventional soft foundation treatment engineering, especially in the coastal undersolidified soft foundation, the soil between piles tends to subside under the action of upper load and dead weight, after the soil between the upper filling and the lower piles subsides to a certain extent, the soil arch effect loss is serious, the soil arch effect loss is developed along with time, and fine particles in the upper broken stone drainage layer and the filling fall into holes between piles through the geogrid, so that the upper filling is subsided and unstable.
Disclosure of Invention
The invention aims to provide an upper cushion layer structure for improving the soil arch effect of a composite foundation, which aims to reduce the loss of the soil arch effect of the composite foundation and reduce the possibility of collapse of a broken stone drainage cushion layer and filled soil.
In order to achieve the above object, the present invention provides an upper cushion structure for improving the arch effect of a composite foundation, wherein the upper cushion structure is laid on a pile body of the composite foundation and comprises a first gravel cushion layer and an interlocking layer which are stacked, wherein:
the interlocking layer comprises a geogrid and a second broken stone cushion layer paved on the geogrid;
the first stone cushion layer and the second stone cushion layer are graded stone, and the particle size distribution of the first stone cushion layer and the second stone cushion layer is D x ；
The aperture of the mesh of the geogrid is d 1 And D is 50 ≤d 1 ≤2D 50 。
Optionally, the particle size of the first and second stone cushions is d 2 Wherein, d is 20.ltoreq.d 2 ≤40。
Optionally, the upper cushion structure includes a plurality of interlocking layers, and a plurality of interlocking layers are stacked in order on the first gravel cushion.
Optionally, the first crushed stone cushion layer has a thickness s 1 Wherein, s is 50.ltoreq.s 1 ≤100。
Optionally, the thickness of the second macadam cushion layer is s 2 Wherein 200.ltoreq.s 2 ≤500。
Optionally, the geogrid has a first mesh, a second mesh, and a third mesh;
the first mesh, the second mesh, and the third mesh have different opening shapes.
Optionally, the openings of the first mesh are regular hexagons, the openings of the second mesh are isosceles trapezoids, and the openings of the third mesh are equilateral triangles.
Optionally, the diameter of the circumscribing circle of the first mesh is r, wherein r is more than or equal to 30mm and less than or equal to 40mm.
Optionally, the thickness of the geogrid is s 3 The side width of each mesh of the geogrid is s 4 Wherein s is 3 s 4 >1。
Optionally, the geogrid is a co-extruded clamped composite geogrid and is formed from three layers of polymeric material.
In the technical scheme of the invention, a first broken stone cushion layer, a geogrid and a second broken stone cushion layer are sequentially laid on a pile body of a composite foundation, meshes of the geogrid are used for embedding graded broken stone of the second broken stone cushion layer, and the apertures of the meshes of the geogrid are d 1 ，d 1 The particle size distribution of the first and the second stone cushions is D x ，D x Meaning less than D x The volume content of the crushed stone with the corresponding particle size accounts for x percent of the volume content of all the crushed stone, and D 50 Meaning less than D 50 The volume content of the crushed stone with the corresponding particle size is half of the volume of the whole crushed stone, and the pore diameter D of the mesh of the geogrid 50 ≤d 1 ≤2D 50 When the soil engineering grid is used, the crushed stone granules can be effectively restrained, the occurrence that the crushed stone granules excessively fall into holes among piles through the soil engineering grid from meshes of the soil engineering grid is avoided, the integrity and rigidity of the mattress cushion layer are improved, the stress diffusion angle is increased, the soil arch effect is enhanced, and the possibility of filling soil collapse on the upper part of the crushed stone mattress cushion layer is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure and load distribution of an embodiment of an upper mat structure according to the present invention;
FIG. 2 is a schematic view of a portion of the embodiment of FIG. 1;
fig. 3 is a cut-away layered schematic of the structure of fig. 2.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 1000 | Upper cushion layer structure | 211 | First mesh openings |
| 1 | First stone breaker | 212 | Second mesh |
| 2 | Interlocking layer | 213 | Third mesh |
| 21 | Geogrid | 22 | Second stone breaker |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention proposes an upper mat structure 1000 for improving the arch effect of a composite soil foundation, and fig. 1 to 3 are an embodiment of the present invention.
In the present inventionIn the illustrated embodiment, as shown in fig. 1 to 3, the upper mat structure 1000 is laid on a pile body of a composite foundation, and the upper mat structure 1000 includes a first gravel mat 1 and an interlocking layer 2 which are stacked, wherein: the interlocking layer 2 comprises a geogrid 21 and a second gravel cushion layer 22 paved on the geogrid 21, the first gravel cushion layer 1 and the second gravel cushion layer 22 are graded gravels, and the particle size distribution of the first gravel cushion layer 1 and the second gravel cushion layer 22 is D x The mesh of the geogrid 21 has a pore diameter d 1 And D is 50 ≤d 1 ≤2D 50 。
In the technical scheme of the invention, a first gravel cushion layer 1, a geogrid 21 and a second gravel cushion layer 22 are sequentially paved on a pile body of a composite foundation, meshes of the geogrid 21 are used for embedding graded gravel of the second gravel cushion layer 22, and apertures of the meshes of the geogrid 21 are d 1 ，d 1 The particle size distribution of the first and second stone mats 1 and 22 is D x ，D x Meaning less than D x The volume content of the crushed stone with the corresponding particle size accounts for x percent of the volume content of all the crushed stone, and D 50 Meaning less than D 50 The volume content of the crushed stone with the corresponding grain size is half of the total crushed stone volume, and the pore diameter D of the mesh holes of the geogrid 21 50 ≤d 1 ≤2D 50 When the geotechnical grid is used, the crushed stone granules can be effectively restrained, the occurrence that the crushed stone granules excessively fall into holes among piles through the geotechnical grid 21 from meshes of the geotechnical grid is avoided, the integrity and rigidity of the mattress cushion layer are improved, the stress diffusion angle is increased, the soil arch effect is enhanced, and the possibility of filling soil collapse on the upper part of the crushed stone mattress cushion layer is reduced.
For selecting the size of graded crushed stone, in one embodiment, the particle size of the first and second crushed stone cushions 1 and 22 is d 2 Wherein, d is 20.ltoreq.d 2 The graded broken stone is not more than 40, namely the selected graded broken stone is coarse aggregate, the coarse aggregate can provide good strength and stability, has good drainage performance, can be used as a broken stone drainage layer of a composite soil base, and is suitable for bearing larger loadAnd (5) carrying out engineering.
In order to improve the application range of the upper mat structure 1000, in an embodiment, the upper mat structure 1000 includes a plurality of interlocking layers 2, and a plurality of interlocking layers 2 are sequentially stacked on the first gravel mat 1, that is, the lowest layer of the upper mat structure 1000 is the first gravel mat 1, the geogrid 21 and the second gravel mat 22 are sequentially paved upward, and the process of paving the geogrid 21 and the second gravel mat 22 is repeated to adapt to various building environment requirements.
The thickness of the first macadam cushion 1 is s 1 Wherein, s is 50.ltoreq.s 1 The thickness of the first crushed stone cushion layer 1 is less than or equal to 100, the first crushed stone cushion layer 1 is a leveling layer so as to provide a smoother environment for the subsequent laying of the geogrid 21, and the thickness of the first crushed stone cushion layer 1 is the depth for the pile body of the composite foundation to penetrate into the upper cushion layer structure 1000, and is less than or equal to 50 s 1 The penetration depth range less than or equal to 100 can ensure that the pile top has certain penetration deformation, and the capacity of mobilizing the composite foundation and exerting the load of the soil is improved.
The thickness of the second stone blanket 22 is s 2 Wherein 200.ltoreq.s 2 Less than or equal to 500, and meets the engineering requirements.
In order to enhance the interlocking capability of the geogrid 21 to graded crushed stone, in one embodiment, the geogrid 21 has a first mesh 211, a second mesh 212 and a third mesh 213, and the openings of the first mesh 211, the second mesh 212 and the third mesh 213 are different in shape, and the difference between the minimum aperture and the maximum aperture is complex, so that the interlocking capability to crushed stone is enhanced, and the amount of crushed stone sinking into soil between piles due to bearing load in use is reduced. In an embodiment, the opening shape of the first mesh 211 is a regular hexagon, the opening shape of the second mesh 212 is an isosceles trapezoid, the opening shape of the third mesh 213 is an equilateral triangle, as shown in fig. 2, each side of the regular hexagon is a common side of the short sides of the isosceles trapezoid, the long side of the isosceles trapezoid is a common side of the equilateral triangle, the first mesh 211, the second mesh 212 and the third mesh 213 are uniformly arranged, and the jogging effect is good. In other embodiments, the shapes of the first mesh openings 211, the second mesh openings 212, and the third mesh openings 213 are not particularly limited, and can be combined with each other to form a dense complete geogrid 21.
In a further embodiment, the diameter of the circumscribing circle of the first mesh hole 211 is r, wherein r is 30mm less than or equal to 40mm less than or equal to the grain size of graded broken stone, so as to better lock the broken stone.
In one embodiment, the geogrid 21 has a thickness s 3 The width of each mesh of the geogrid 21 is s 4 Wherein s is 3 s 4 >1 to increase the strength of the geogrid 21 and reduce the possibility of side damage to the mesh openings thereof.
The geogrid 21 is a co-extrusion clamping composite geogrid 21, and can be formed into a multi-layer structure by adopting a plurality of materials through co-extrusion, in this embodiment, as shown in fig. 3, the geogrid is integrally formed by adopting three layers of polymer materials after punching and directional stretching, so as to improve the structural rigidity, the interfacial friction performance and the like of the geogrid 21; in the figures, (1), (2) and (3) represent three layers of polymeric material.
The construction process of the composite foundation is as follows:
firstly, constructing a pile body, curing the pile body to a specified strength, and checking and accepting the pile body to be qualified, wherein the pile body is generally a CFG pile, a gravel pile, a cement soil stirring pile, a jet grouting pile, a tubular pile and the like;
paving a first broken stone cushion layer 1 and leveling;
paving a geogrid 21 and a second broken stone cushion layer 22; the second gravel cushion 22 is laid according to the designed thickness and compacted as required;
according to the construction requirements of the construction site, multiple layers of geogrids 21 are repeatedly paved, and the geogrids 21 are filled and compacted by broken stone, namely, second broken stone cushions 22 are arranged between the geogrids 21.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The utility model provides an upper portion bed course structure of improvement compound foundation soil arch effect, upper portion bed course structure lays on the pile body of compound foundation, its characterized in that, upper portion bed course structure is including the first rubble bed course of range upon range of setting and the interlocking layer, wherein:
the interlocking layer comprises a geogrid and a second broken stone cushion layer paved on the geogrid;
the first stone cushion layer and the second stone cushion layer are graded stone, and the particle size distribution of the first stone cushion layer and the second stone cushion layer is D x ；
The aperture of the mesh of the geogrid is d 1 And D is 50 ≤d 1 ≤2D 50 。
2. The upper mat structure of claim 1, wherein said first and second crushed stone mats have a particle size d 2 Wherein, d is 20.ltoreq.d 2 ≤40。
3. The upper mat structure of claim 1, wherein said upper mat structure includes a plurality of said interlocking layers, a plurality of said interlocking layers being stacked in sequence on said first crushed stone mat.
4. The upper mat structure of claim 1, wherein the first crushed stone mat has a thickness s 1 Wherein, s is 50.ltoreq.s 1 ≤100。
5. The upper mat structure of claim 1, wherein said second crushed stone mat has a thickness s 2 Wherein 200.ltoreq.s 2 ≤500。
6. The upper mat structure of claim 1, wherein the geogrid has a first mesh, a second mesh, and a third mesh;
the first mesh, the second mesh, and the third mesh have different opening shapes.
7. The upper mattress construction of claim 6, wherein the openings of the first cells are regular hexagons, the openings of the second cells are isosceles trapezoids, and the openings of the third cells are equilateral triangles.
8. The upper mattress structure of claim 7, wherein the circumscribed circle of the first cells has a diameter r, wherein 30mm +.r +.40 mm.
9. The upper mattress structure of claim 1, wherein said geogrid has a thickness s 3 The side width of each mesh of the geogrid is s 4 Wherein s is 3 s 4 >1。
10. The upper mat structure of claim 1, wherein the geogrid is a co-extruded sandwich composite geogrid and is formed from three layers of polymeric material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310757448.7A CN117051807A (en) | 2023-06-25 | 2023-06-25 | Upper cushion layer structure for improving arch effect of composite foundation soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310757448.7A CN117051807A (en) | 2023-06-25 | 2023-06-25 | Upper cushion layer structure for improving arch effect of composite foundation soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117051807A true CN117051807A (en) | 2023-11-14 |
Family
ID=88654183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310757448.7A Pending CN117051807A (en) | 2023-06-25 | 2023-06-25 | Upper cushion layer structure for improving arch effect of composite foundation soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117051807A (en) |
-
2023
- 2023-06-25 CN CN202310757448.7A patent/CN117051807A/en active Pending
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