CN215758302U - High liquid limit soil roadbed structure - Google Patents
High liquid limit soil roadbed structure Download PDFInfo
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- CN215758302U CN215758302U CN202121090039.9U CN202121090039U CN215758302U CN 215758302 U CN215758302 U CN 215758302U CN 202121090039 U CN202121090039 U CN 202121090039U CN 215758302 U CN215758302 U CN 215758302U
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Abstract
The utility model discloses a high liquid limit soil roadbed structure, wherein a lamella layer is paved on a base of a soft foundation subjected to dredging, a primary high liquid limit soil platform is filled on the surface of the lamella layer, a geogrid layer is paved on the surface of the primary high liquid limit soil platform, a secondary high liquid limit soil platform is arranged on the geogrid layer, a non-high liquid limit soil layer is paved on the surface of the secondary high liquid limit soil platform, a lamella stone interlayer is paved on the surface of the non-high liquid limit soil layer, a non-high liquid limit soil layer is paved on the surface of the lamella stone interlayer, and a three-level high liquid limit soil platform is filled on the surface of the non-high liquid limit soil layer. Because the flaky stone layer is paved on the substrate after the soft foundation is desilted, the strength of the roadbed is improved, and the permeable roadbed is beneficial to downward drainage; because the rubble interlayer is additionally arranged between the second-level high liquid limit soil platform and the third-level high liquid limit soil platform, the problem of uneven subgrade settlement is solved.
Description
Technical Field
The utility model relates to the field of roadbed filling, in particular to a high liquid limit soil roadbed structure.
Background
High liquid limit soil is distributed in the residual soil on slopes of Jurasia volcanic rock and granite areas in Yanshan mountain period and full-strength weathered rock, in the south humid area of China, the soil quality is high liquid limit soil, the rainy season of the local area is 4-9 months per year, the rainy season is relatively long, rainfall is frequent, and the average number of days of rainfall per month is more than 20 days. Shallow soft soil is distributed in mountain depression, valley, basin corridor zones and mountain depression road sections, and the stability of embankment filling is not good due to consolidation and settlement of the soft soil. Soft soil is scattered and buried with depth not exceeding 3m under general condition; when the thickness of the soft soil is more than 12 meters, the soil is called a high-fill subgrade.
When the liquid limit of the high liquid limit soil is more than 50 percent and less than =60 percent, and the content of fine particles is more than 90 percent, the subgrade is easily influenced by external climate, the humidity migrates in the high liquid limit soil to cause uneven settlement, especially in rainy season (4 to 9 months per year), the subgrade is influenced by frequent rainfall and long rainfall period, the difficulty on improving and filling construction organization of the high liquid limit soil is high, the construction period is long, the construction cost is high, the improvement construction is unfavorable in rainy season, the material waste is easy to cause, the replacement engineering quantity is large for the high fill subgrade, and the damage to the nearby natural environment can be caused at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a high liquid limit soil roadbed structure, which solves one or more technical problems in the prior art and at least provides a beneficial selection or creation condition.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
a rubble layer is paved on a base after soft foundation dredging, a first-level high liquid limit soil platform is filled on the surface of the rubble layer, a geogrid layer is paved on the surface of the first-level high liquid limit soil platform, a second-level high liquid limit soil platform is arranged on the geogrid layer, a non-high liquid limit soil layer is paved on the surface of the second-level high liquid limit soil platform, a rubble interlayer is paved on the surface of the non-high liquid limit soil layer, a non-high liquid limit soil layer is paved on the surface of the rubble interlayer, and a third-level high liquid limit soil platform is filled on the surface of the non-high liquid limit soil layer.
Furthermore, a geogrid layer is paved on the surface of the three-level high liquid limit soil platform, and the four-level high liquid limit soil platform is arranged on the geogrid layer.
Furthermore, an anti-seepage geomembrane is laid on the surface of the four-stage high liquid limit soil platform.
Furthermore, the rubble intermediate layer comprises a rubble lower layer, a geogrid layer and a rubble upper layer from bottom to top in sequence.
Further, the particle size of the flaky stone is 10 cm-30 cm.
Further, the thicknesses of the lower layer of the flaky stone and the upper layer of the flaky stone are both 40-60 cm.
Further, the impermeable geomembrane is an M1/PE impermeable geomembrane.
Further, the geogrid layer adopts a TX150 polypropylene geogrid.
Further, the thickness of the sheet stone layer is 100cm-150 cm; the thickness of the first-level high liquid limit soil platform is 120-180 cm; the thickness of the second-level high liquid limit soil platform is 500-600 cm.
Furthermore, a platform drainage ditch and a displacement pier are arranged at the left side and the right side of the second-level high liquid limit soil platform and the left side and the right side of the third-level high liquid limit soil platform.
The utility model has the beneficial effects that:
because the flaky stone layer is paved on the substrate after the soft foundation is desilted, the strength of the roadbed is improved, and the permeable roadbed is beneficial to downward drainage; because the rubble interlayer is additionally arranged between the second-level high liquid limit soil platform and the third-level high liquid limit soil platform, the problem of uneven subgrade settlement is solved; a layer of waterproof and anti-seepage geomembrane is laid on the upper and lower submitting interfaces, so that the influence of humidity migration can be effectively isolated.
Drawings
The utility model is further described with the aid of the accompanying drawings, in which the embodiments do not constitute any limitation, and for a person skilled in the art, without inventive effort, further drawings may be obtained from the following figures:
fig. 1 is a schematic structural view of a roadbed according to the present invention;
fig. 2 is an enlarged view of a point a shown in fig. 1.
In the figure: 1. a base surface after dredging; 2. A flaky stone layer; 3. A first-level high liquid limit soil platform; 4. A geogrid layer; 5. A secondary high liquid limit soil platform; 6. a non-high liquid limit soil layer; 7. a stone interlayer; 8. a non-high liquid limit soil layer; 9. a three-level high liquid limit soil platform; 10. a geogrid layer; 11. a four-stage high liquid limit soil platform; 12. an impermeable geomembrane; 13. a platform drainage ditch; 14. displacing the pier; 71. a lower layer of slate; 72. a geogrid layer; 73. and (5) a flaky stone upper layer.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it is to be noted that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward", "reverse", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
As shown in fig. 1 and 2, a high liquid limit soil roadbed structure comprises the following steps: a sheet stone layer 2 is laid on a substrate 1 after soft foundation dredging, the thickness of the sheet stone layer 2 is 100cm-150cm, a primary high liquid limit soil platform 3 is filled on the surface of the sheet stone layer 2, the thickness of the primary high liquid limit soil platform 3 is 120 plus materials 180cm, a geogrid layer 4 is laid on the surface of the primary high liquid limit soil platform 3, a secondary high liquid limit soil platform 5 is arranged on the geogrid layer 4, the thickness of the secondary high liquid limit soil platform 5 is 500 plus materials 600cm, a non-high liquid limit soil layer 6 is laid on the surface of the secondary high liquid limit soil platform 5, a sheet stone interlayer 7 is laid on the surface of the non-high liquid limit soil layer 6, a non-high liquid limit soil layer 8 is laid on the surface of the sheet stone interlayer 7, a tertiary high liquid limit soil platform 9 is filled on the surface of the non-high liquid limit soil layer 8, a geogrid layer 10 is laid on the surface of the tertiary high liquid limit soil platform 9, a quaternary high liquid limit soil platform 11 is arranged on the geogrid layer 10, and a seepage-proofing membrane 12 is arranged on the surface of the quaternary high liquid limit soil platform 11, the impermeable geomembrane 12 is an M1/PE impermeable geomembrane. And a platform drainage ditch 13 and a displacement pier 14 are arranged at the left side and the right side on the second-stage high liquid limit soil platform 5 and the left side and the right side on the third-stage high liquid limit soil platform 9.
Wherein, the rubble interlayer 7 comprises a rubble lower layer 71, a geogrid layer 72 and a rubble upper layer 73 from bottom to top in sequence. The particle size of the flaky stones is 10-30 cm, the thicknesses of the lower layer of the flaky stones and the upper layer of the flaky stones are both 40-60 cm, and the geogrid layer 73 adopts a TX150 polypropylene geogrid.
The construction process of the high liquid limit soil roadbed structure comprises the following steps:
step 1, soft foundation dredging and bearing capacity testing.
Step 2, filling and replacing the soft foundation with the rubble: and paving the flakelets on the desilted base surface 1 in a manner of lattice forming and feeding, marking pole hanging and bulldozer stone pushing to form a flakelet layer 2 capable of seeping water downwards.
Step 3, filling the embankment in layers: the method comprises the steps of adopting horizontal layered filling, layered rolling and layered edge covering, using high liquid limit soil meeting filling requirements as fillers, using clay to cover two side edges of each layer of fillers in the layered filling process, and filling the embankment in layers to form a first-level high liquid limit soil platform 3.
Step 4, performing dynamic compaction and high-strength geogrid construction on the first-level high-liquid soil-limiting platform 3: during dynamic compaction, point compaction construction is firstly carried out, and then full compaction construction is carried out.
and 6, dynamically tamping the secondary high liquid limit soil platform 5 and paving a laminated stone layer 7.
And 7, filling a third-level high liquid limit soil platform 9 and a fourth-level high liquid limit soil platform 11 in a layered mode, and paving a geogrid layer 10 on the surface of the third-level high liquid limit soil platform 9.
And 8, dynamically tamping the four-stage high liquid limit soil platform 11 and paving an impermeable geomembrane 12.
Application examples of the utility model: the contract segment TJ5 from Fenghua highway to Wuhua segment is located in Wuhua county of Meizhou city, from K104+920 to K112+780, the length is about 7.86km, the highway grade is the highway, and the designed speed per hour is 100 km/m. 1790m/8 of bridge; the culvert extends the length of a rice/15 channel by 88 m, and the roadbed comprises 6070m/8 sections. The width of the integral roadbed is 26.0m, wherein: the middle belt width is 3.5m, the lane width is 2 multiplied by 7.5m, the hard road shoulder width is 2 multiplied by 3.0m, and the soil road shoulder width is 2 multiplied by 0.75 m.
The standard section belongs to a wet area in south of Ling, soil quality is high liquid limit soil, a high filling embankment is formed when the soil quality is more than 12 meters, the embankment of the standard section is the high filling embankment, and the maximum filling height is 38 m. On the basis of ensuring the construction safety and quality of the roadbed, the filling construction of the K108+ 130-270 section of the high liquid limit soil roadbed is quickly completed. By the method, the high liquid limit soil abandonment amount and the improved engineering amount are reduced, the comprehensive utilization rate of the high liquid limit soil is greatly improved, and great economic benefits are brought to projects.
Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A high liquid limit soil roadbed structure is characterized in that a lamella layer is paved on a base of a soft foundation subjected to dredging, a first-level high liquid limit soil platform is filled on the surface of the lamella layer, a geogrid layer is paved on the surface of the first-level high liquid limit soil platform, a second-level high liquid limit soil platform is arranged on the geogrid layer, a non-high liquid limit soil layer is paved on the surface of the second-level high liquid limit soil platform, a lamella stone interlayer is paved on the surface of the non-high liquid limit soil layer, a non-high liquid limit soil layer is paved on the surface of the lamella stone interlayer, and a third-level high liquid limit soil platform is filled on the surface of the non-high liquid limit soil layer.
2. The high liquid limit soil roadbed structure of claim 1, wherein: the surface of the third-level high liquid limit soil platform is paved with a geogrid layer, and the fourth-level high liquid limit soil platform is arranged on the geogrid layer.
3. The high liquid limit soil roadbed structure of claim 2, wherein: and an anti-seepage geomembrane is laid on the surface of the four-stage high liquid limit soil platform.
4. The high liquid limit soil roadbed structure of claim 3, wherein: the stone interlayer sequentially comprises a stone lower layer, a geogrid layer and a stone upper layer from bottom to top.
5. The high liquid limit soil roadbed structure of claim 4, wherein: the particle size of the flaky stone is 10-30 cm.
6. The high liquid limit soil subgrade structure of claim 5, wherein: the thickness of the lower layer of the flaky stone and the thickness of the upper layer of the flaky stone are both 40-60 cm.
7. The high liquid limit soil roadbed structure of claim 3, wherein: the impermeable geomembrane is an M1/PE impermeable geomembrane.
8. The high liquid limit soil roadbed structure of claim 1, wherein: the geogrid layer adopts TX150 polypropylene geogrid.
9. The high liquid limit soil subgrade structure of claim 5, wherein: the thickness of the flaky stone layer is 100cm-150 cm; the thickness of the first-level high liquid limit soil platform is 120-180 cm; the thickness of the second-level high liquid limit soil platform is 500-600 cm.
10. The high liquid limit soil subgrade structure of claim 5, wherein: and a platform drainage ditch and a displacement pier are arranged at the left side and the right side on the second-stage high liquid limit soil platform and the left side and the right side on the third-stage high liquid limit soil platform.
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| CN202121090039.9U CN215758302U (en) | 2021-05-20 | 2021-05-20 | High liquid limit soil roadbed structure |
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| CN202121090039.9U CN215758302U (en) | 2021-05-20 | 2021-05-20 | High liquid limit soil roadbed structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479698A (en) * | 2023-06-21 | 2023-07-25 | 湖南大学 | Roadbed structure based on construction waste and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479698A (en) * | 2023-06-21 | 2023-07-25 | 湖南大学 | Roadbed structure based on construction waste and construction method thereof |
| CN116479698B (en) * | 2023-06-21 | 2023-09-15 | 湖南大学 | Roadbed structure based on construction waste and construction method thereof |
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