CN110965398B - Expansive soil foundation structure containing ballastless track roadbed and construction method - Google Patents
Expansive soil foundation structure containing ballastless track roadbed and construction method Download PDFInfo
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- CN110965398B CN110965398B CN201911168759.XA CN201911168759A CN110965398B CN 110965398 B CN110965398 B CN 110965398B CN 201911168759 A CN201911168759 A CN 201911168759A CN 110965398 B CN110965398 B CN 110965398B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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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
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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
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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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
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides an expansive soil foundation structure containing a ballastless track roadbed and a construction method, wherein the expansive soil foundation structure comprises a porous pipe pile, an expansive soil foundation, a geosynthetic material reinforced cushion layer and a ballastless track roadbed, wherein the porous pipe pile and the expansive soil foundation are arranged at the lowest part, and the geosynthetic material reinforced cushion layer and the ballastless track roadbed are sequentially arranged above the porous pipe pile and the expansive soil foundation from bottom to top; the vertical many porous tubular piles that are provided with in the inflation soil foundation, porous tubular pile includes hollow porous pile body and fills the elastomer material in it, hollow porous pile body is hollow reinforced concrete structure, porous tubular pile still includes the radial through-hole that upwards link up hollow porous pile body inside and outside wall. The method effectively reduces the expansion and shrinkage deformation of the expansive soil foundation during water immersion and dehydration, controls the expansion and shrinkage deformation of the ballastless track roadbed within a reasonable range, meets the high-speed and safe operation requirements of a train on the ballastless track roadbed, and saves the cost for reinforcing and treating the expansive soil foundation.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering foundation reinforcement, and particularly relates to an expansive soil foundation structure containing a ballastless track roadbed and a construction method.
Background
The ballastless track of the high-speed railway has the advantages of high speed, high stability, high safety and the like, and is widely developed and applied, however, the realization of the advantages needs to ensure that the deformation control of the roadbed is in an extremely strict range. The expansive soil is a special soil with remarkable expansion and contraction characteristics, and can seriously threaten the deformation of a ballastless track roadbed, even cause deformation diseases such as uneven settlement, upwarp deformation, external extrusion of a bed and the like of the railway roadbed, and the diseases have repeatability and long-term property and are difficult to treat, thereby seriously restricting the construction of the ballastless track roadbed of the high-speed railway in an expansive soil area. Therefore, it is necessary to provide a measure for treating the expansive and shrinkage deformation of the expansive soil foundation applicable to the ballastless track of the high-speed railway.
At present, in order to treat the swelling deformation caused by the expansive soil foundation, proposed measures comprise reinforcement measures such as long and short micro piles, gravel piles, anchoring piles and the like, the swelling force of the expansive soil is limited through the friction resistance of the pile periphery interface, and then the swelling deformation of the foundation is controlled, but under the extreme and long-term service environment, the friction resistance of the pile periphery interface may not be enough to limit the larger swelling force, and even may gradually fail, so that the expansive soil foundation still generates the swelling deformation. The method for limiting the expansion force by increasing the frictional resistance of the pile periphery interface still has the defects of principle limitation and technical obstacle in application.
Patent document CN201710609816 discloses a ballastless track railway expanded dirt road-cutting structure and a construction method, which comprises the following steps: the cement fly ash gravel piles are transversely and longitudinally arranged in rows at intervals to form a composite foundation in the expansive soil foundation, and the arrangement depth of the cement fly ash gravel piles exceeds the atmospheric influence thickness of the expansive soil; the elastic geotechnical section is arranged in the surface layer of the expansive soil foundation between two rows of transversely adjacent cement fly ash gravel piles and extends longitudinally along the expansive soil foundation; the cushion layer structure is filled on the top of the composite foundation layer by layer; the foundation bed bottom layer is filled on the top of the cushion layer structure in a layered mode, and the foundation bed surface layer is filled on the top of the foundation bed bottom layer in a layered mode; and the drainage side ditches are arranged at two sides of the cutting structure, and the bottom of the drainage side ditches is provided with a longitudinal blind ditch. The patent directly releases the vertical deformation of the expansive soil foundation by utilizing the elastic capacity of the elastic geotechnical section, thereby reducing the expansive force and the uplift deformation of the foundation, but when excessive vertical deformation is released, the excessive exceeding of the settlement deformation of the expansive soil foundation is easily caused; although this patent has utilized cement fly ash gravel pile and bed course structure, too big settlement deformation can lead to the bed course to destroy and the inflation soil foundation appears the space and warp, causes the potential safety hazard of high-speed rail train operation.
Disclosure of Invention
The invention aims to provide an expansive soil foundation structure containing a ballastless track roadbed and a construction method thereof, which aim to solve the problems of the expansive soil foundation provided in the background technology that the expansive soil foundation is lifted and deformed when immersed in water and is contracted and deformed when dehydrated, so that the expansive and contracted deformation of the ballastless track roadbed can be controlled in a reasonable range.
In order to achieve the purpose, the invention provides an expansive soil foundation structure containing a ballastless track roadbed, which comprises a porous pipe pile, an expansive soil foundation, a geosynthetic material reinforced cushion layer and a ballastless track roadbed, wherein the porous pipe pile and the expansive soil foundation are arranged at the lowest part, and the geosynthetic material reinforced cushion layer and the ballastless track roadbed are sequentially arranged above the porous pipe pile and the expansive soil foundation from bottom to top; a plurality of porous tubular piles are vertically arranged in the expansive soil foundation, each porous tubular pile comprises a hollow porous pile body and an elastomer material filled in the hollow porous pile body, each hollow porous pile body is of a hollow reinforced concrete structure, and each porous tubular pile further comprises a radial through hole which radially penetrates through the inner wall and the outer wall of each hollow porous pile body; the geosynthetic reinforcement mat comprises a geogrid and a sand layer and/or a soil layer which are arranged above and below the geogrid.
In a specific embodiment, the geosynthetic reinforcement mat is formed by stacking a lower medium coarse sand layer, a geogrid, an upper medium coarse sand layer, a lower coarse particle soil layer, the geogrid and an upper coarse particle soil layer which are sequentially laid from bottom to top.
In a specific embodiment, the thickness of the lower medium coarse sand layer and the thickness of the upper medium coarse sand layer are both 0.08-0.12 m; the thickness of the lower coarse particle soil layer and the thickness of the upper coarse particle soil layer are both 0.12-0.18 m.
In a particular embodiment, the elastomeric material is a particulate material, preferably waste tire rubber particles; the whole porous tubular pile is in a hollow cylinder shape; 2-4 radial through holes on each porous tubular pile are uniformly distributed at intervals along the circumferential direction of the pile; the radial through holes on each porous tubular pile are uniformly arranged at intervals along the pile length direction.
In a specific embodiment, the porous pipe piles are arranged in the expansive soil foundation at regular intervals in a rectangular or quincunx shape along the longitudinal and transverse directions in the horizontal direction; the outer diameter of the porous tubular pile is not more than 0.6m, and the aperture of the radial through hole is 0.03-0.08 m; the setting depth of the length of the porous pipe pile body in the expansive soil foundation exceeds the atmospheric influence depth.
In a specific embodiment, the geosynthetic reinforcement mat is provided with 3% to 5% of drainage slopes towards both sides along the center of the roadbed.
The invention also provides a construction method of the expansive soil foundation structure containing the ballastless track roadbed, and the construction method comprises the following steps:
step 1: processing and binding a reinforcement cage in a prefabrication plant, assembling a template with a reserved hole on the inner side of the hollow porous pile body, hoisting the reinforcement cage in place, and assembling the template with the reserved hole on the outer side of the hollow porous pile body;
step 2: pouring concrete, curing and forming, removing the template after the concrete of the hollow porous pile body reaches the strength required by the design, continuing curing to reach the design strength, and then transporting the hollow porous pile body to a construction site;
and step 3: according to the arrangement position of the porous pipe piles, a drilling machine is adopted to drill a lead hole in advance in the expansive soil foundation, after the lead hole is formed, a hollow porous pile body is hoisted into the lead hole, a pile driver is utilized to drive the hollow porous pile body into the expansive soil foundation to a depth below the atmospheric influence depth in the expansive soil foundation, then, an elastomer material is densely filled in the hollow interior of the hollow porous pile body, and finally, a pile top orifice is filled, compacted and sealed by clay;
and 4, step 4: laying a geosynthetic material reinforced cushion layer on the surface of the expansive soil foundation;
and 5: filling filler on the reinforced cushion layer of the geosynthetic material and compacting to form the ballastless track roadbed.
In a specific embodiment, in the step 3, the hollow porous pile bodies are sequentially driven from the center of the roadbed to two sides.
In a specific embodiment, in the step 4, the geosynthetic reinforcement mat layer is provided with 3% to 5% of drainage slopes towards two sides along the center of the roadbed.
In a specific embodiment, in the step 4, the geosynthetic material reinforced cushion layer is formed by stacking a lower medium coarse sand layer, a geogrid, an upper medium coarse sand layer, a lower coarse particle soil layer, a geogrid and an upper coarse particle soil layer, which are sequentially laid from bottom to top.
Compared with the prior art, the invention has the following beneficial effects:
the invention effectively reduces the swelling deformation of the expansive soil foundation during soaking and the shrinkage deformation of the expansive soil foundation during water loss, so that the swelling deformation of the ballastless track roadbed is controlled in a reasonable range, the high-speed and safe operation requirements of a train on the ballastless track roadbed are met, and the engineering investment for the treatment of the expansive soil foundation reinforcement can be saved.
When the expansive soil foundation is soaked in water and expanded, the lateral expansion deformation of the expansive soil foundation can be released through the combined action of the radial through holes arranged on the hollow porous pile bodies of the porous pipe piles and the compressed elastomer material, so that the expansive force of the expansive soil foundation is weakened, the bulging deformation of the expansive soil foundation and the upward interface friction resistance of the porous pipe piles caused by the bulging deformation are reduced, and the problem of the ballastless track subgrade bulging deformation caused by the expansive soil foundation in water is solved. When the expansive soil foundation is dehydrated and contracted, the compressed elastomer material generates rebound deformation and is transversely transmitted through the radial through hole on the hollow porous pile body, so that the lateral expansion deformation of the expansive soil foundation can be recovered to reduce the settlement deformation of the ballastless track roadbed. When a train is repeatedly loaded, a geosynthetic reinforced cushion layer is arranged on the surface of the expansive soil foundation and the top surface of the porous pipe pile, so that the load of the train transmitted by the ballastless track roadbed can be borne under the condition of dehydration shrinkage of the expansive soil foundation, and transmitted to the top of the porous pipe pile, and further transmitted to the depth below the atmospheric influence depth of the expansive soil foundation, thereby solving the settlement and deformation of the ballastless track roadbed caused by dehydration shrinkage of the expansive soil foundation and the repeated loading action of the train, ensuring the stable deformation of the ballastless track roadbed, meeting the high-speed, stable and safe operation requirements of the train, and having great significance and application value for building the ballastless track roadbed of the high-speed railway in the expansive soil area.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a cross-sectional view of one embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an expansive soil foundation and a porous pipe pile according to an embodiment of the present invention;
fig. 3 is a view showing a construction of a geosynthetic reinforcement mat according to an embodiment of the present invention;
FIG. 4 is a view showing the construction of a porous pipe pile according to an embodiment of the present invention;
wherein, 1, a porous pipe pile; 2. a geosynthetic reinforcement mat; 3. a ballastless track subgrade; 4. expanding the soil foundation; 11. a hollow porous pile body; 12. an elastomeric material; 13. a radial through hole; 21. a geogrid; 22. a lower medium coarse sand layer; 23. a middle coarse sand layer is arranged; 24. a coarse particle soil layer is arranged; 25. and (5) covering a coarse particle soil layer.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1
Referring to fig. 1, 2 and 4, the expansive soil foundation structure containing the ballastless track roadbed comprises a porous pipe pile 1, an expansive soil foundation 4, a geosynthetic material reinforced cushion layer 2 and a ballastless track roadbed 3. The porous tubular pile 1 is composed of a hollow porous pile body 11 and waste tire rubber particles as an elastomer material 12. The hollow porous pile body 11 of the porous pipe pile 1 consists of concrete and reinforcing steel bars embedded in the concrete, the interior of the pile body is hollow, and a series of radial through holes 13 are arranged at intervals along the pile body, namely the radial through holes on each porous pipe pile are uniformly arranged at intervals along the peripheral direction of the pile; the radial through holes on each porous tubular pile are also uniformly arranged at intervals along the pile length direction. The inside of porous tubular pile 1 adopts the closely knit packing of discarded tire rubber granule. The lateral expansion deformation of the expansive soil foundation 4 can be allowed to be released through the radial through holes 13 of the pile body and the compressed waste tire rubber particles, so that the expansion force of the expansive soil foundation 4 in the process of soaking is weakened, the bulging deformation of the expansive soil foundation 4 and the upward interface friction resistance of the pile body caused by the bulging deformation of the expansive soil foundation 4 are reduced, and the bulging deformation of the ballastless track subgrade 3 caused by the water-soaking expansion of the expansive soil foundation 4 is solved; when the expansive soil foundation 4 loses water and contracts, the compressed waste tire rubber particles generate deformation resilience and are transversely transferred through the radial through holes 13 on the hollow porous pile body 11, so that the lateral expansion deformation of the expansive soil foundation 4 can be recovered to reduce the settlement deformation of the ballastless track roadbed 3. If the uplift deformation is reduced only by the friction resistance of the pile body interface or by releasing the vertical deformation of the expansive soil foundation 4 by the elastomer material 12, the uplift deformation can be reduced by directly releasing the vertical deformation of the expansive soil foundation 4, but the settlement deformation of the expansive soil foundation 4 is extremely easy to exceed the standard. According to the invention, through the release and resilience of the lateral expansion deformation of the expansive soil foundation 4, the bulging deformation of the expansive soil foundation 4 is reduced, and the problem that the settlement deformation of the expansive soil foundation 4 is easy to exceed the standard is solved. Porous tubular piles 1 are arranged in the expansive soil foundation 4 at equal intervals in a square mode in the longitudinal direction and the transverse direction, and the length of a pile body is larger than the atmospheric influence depth in the expansive soil foundation 4. The geosynthetic material reinforced cushion layer 2 is laid on the surface of the expansive soil foundation 4 and above the top surface of the porous tubular pile 1, the train load transmitted by the ballastless track roadbed 3 can be borne under the condition of further guaranteeing the dehydration shrinkage of the expansive soil foundation 4, the train load is transmitted to the pile top of the porous tubular pile 1, and then the train load is transmitted to the expansive soil foundation 4 to the depth below the atmospheric influence depth, so that the settlement and deformation of the ballastless track roadbed 3 caused by the dehydration shrinkage of the expansive soil foundation 4 and the repeated loading action of the train are solved, the deformation stability of the ballastless track roadbed 3 is guaranteed, and the requirements of high speed, stability and safe operation of the train are met. The method has great significance and application value for building the ballastless track subgrade of the high-speed railway in the expanded land area. The atmospheric influence depth refers to the effective depth of the lifting deformation of soil caused by factors such as precipitation, evaporation, ground temperature and the like under the action of natural climate; the value of the soil is determined by the observation of deep deformation of soil in each climate zone or the observation of water content and the observation of ground temperature, and if no data exists, the value can be taken according to the regulations in relevant specifications. Common atmospheric depths of influence range from 3m to 5 m.
Referring to fig. 2, the porous pipe piles 1 are arranged in the expansive soil foundation 4 at intervals in the longitudinal and transverse directions and are arranged at equal intervals in a rectangular or quincunx shape on a plane, the pile diameter is not more than 0.6m, and the pile body length exceeds the atmospheric influence depth in the expansive soil foundation 4.
Referring to fig. 4, the diameter of the radial through hole 13 formed in the hollow porous pile body of the porous tubular pile 1 is 0.03m to 0.08 m.
Referring to fig. 3, the geosynthetic reinforcement mat 2 is formed by stacking a lower medium coarse sand layer 22, a geogrid 21, an upper medium coarse sand layer 23, a lower coarse grain soil layer 24, the geogrid 21 and an upper coarse grain soil layer 25 in this order from bottom to top. The geosynthetic reinforcement mat layer 2 is provided with a 4% drainage gradient towards both sides along the center of the roadbed. The thicknesses of the lower middle coarse sand layer 22 and the upper middle coarse sand layer 23 are both 0.1 m. The thicknesses of the lower coarse particle soil layer 24 and the upper coarse particle soil layer 25 are both 0.15 m. The medium coarse sand refers to sand with the particle size of more than or equal to 0.5mm, and the coarse granular soil refers to granular soil with the maximum particle size of less than 60 mm.
Referring to fig. 1, the ballastless track bed 3 is filled on a geosynthetic reinforcement mat 2.
Referring to fig. 1, the invention also provides a construction method of the expansive soil foundation structure containing the ballastless track subgrade, which comprises the following steps:
step 1: processing and binding a reinforcement cage in a prefabrication plant, assembling a template with a reserved hole on the inner side of the hollow porous pile body 11, hoisting the reinforcement cage in place, and assembling the template with the reserved hole on the outer side of the hollow porous pile body 11;
step 2: pouring concrete, curing and forming, removing the template after the concrete of the hollow porous pile body 11 reaches the strength required by the design, continuing curing to reach the design strength, and then transporting the hollow porous pile body 11 to a construction site;
and step 3: according to the arrangement position of the porous pipe piles 1, a drilling machine drills guide holes in advance in the expansive soil foundation 4 to form the guide holes, namely, the hollow porous pile bodies 11 are hung in the guide holes, according to the principle of sequence from the center of the roadbed to two sides, a pile driver is utilized to drive the hollow porous pile bodies 11 into the expansive soil foundation 4 to a depth below the atmospheric influence depth in the expansive soil foundation 4, then waste tire rubber particles are densely filled in the hollow interiors of the hollow porous pile bodies 11, and finally, clay is utilized to fill, compact and seal the openings of pile tops;
and 4, step 4: sequentially laying a lower medium coarse sand layer 22, a geogrid 21, an upper medium coarse sand layer 23, a lower coarse particle soil layer 24, the geogrid 21 and an upper coarse particle soil layer 25 on the surface of the expansive soil foundation 4 from bottom to top to form the geosynthetic material reinforced cushion layer 2; the geosynthetic reinforcement cushion layer 2 is provided with 4% of drainage gradient towards two sides along the center of the roadbed;
and 5: filling materials are filled on the geosynthetic material reinforced cushion layer 2 and compacted to form the ballastless track roadbed 3.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The expansive soil foundation structure containing the ballastless track roadbed is characterized by comprising a porous pipe pile (1), an expansive soil foundation (4), a geosynthetic material reinforced cushion layer (2) and the ballastless track roadbed (3), wherein the porous pipe pile (1) and the expansive soil foundation (4) are arranged at the lowest part, and the geosynthetic material reinforced cushion layer (2) and the ballastless track roadbed (3) are sequentially arranged above the porous pipe pile (1) and the expansive soil foundation (4) from bottom to top; a plurality of porous tubular piles (1) are vertically arranged in the expansive soil foundation (4), each porous tubular pile (1) comprises a hollow porous pile body (11) and an elastomer material (12) filled in the hollow porous pile body, each hollow porous pile body (11) is of a hollow reinforced concrete structure, and each porous tubular pile (1) further comprises a radial through hole (13) which radially penetrates through the inner wall and the outer wall of each hollow porous pile body (11); the geosynthetic reinforcement mat (2) comprises a geogrid (21) and sand layers and/or soil layers arranged above and below the geogrid (21).
2. The expansive soil foundation construction according to claim 1, wherein the geosynthetic reinforcement mat (2) is constructed by stacking a lower and middle coarse sand layer (22), a geogrid (21), an upper and middle coarse sand layer (23), a lower coarse grain soil layer (24), a geogrid (21), and an upper coarse grain soil layer (25) sequentially laid from bottom to top.
3. The expansive soil foundation construction according to claim 2, wherein the lower and upper medium coarse sand layers (22, 23) each have a thickness of 0.08-0.12 m; the thickness of the lower coarse particle soil layer (24) and the thickness of the upper coarse particle soil layer (25) are both 0.12-0.18 m.
4. The expansive soil foundation construction as claimed in claim 1, wherein said elastomeric material (12) is a granular material, preferably waste tire rubber granules; the porous tubular pile (1) is integrally in a hollow cylindrical shape; the radial through holes (13) on each porous tubular pile (1) are uniformly distributed at intervals of 2-4 in the circumferential direction of the pile; radial through holes (13) on each porous tubular pile (1) are uniformly arranged at intervals along the pile length direction.
5. The expansive soil foundation construction according to claim 1, wherein the porous pipe piles (1) are arranged in the expansive soil foundation (4) at regular intervals in a rectangular or quincunx shape in the longitudinal and transverse directions in the horizontal direction; the outer diameter of the porous tubular pile (1) is not more than 0.6m, and the aperture of the radial through hole (13) is 0.03-0.08 m; the setting depth of the length of the pile body of the porous pipe pile (1) in the expansive soil foundation (4) exceeds the atmospheric influence depth.
6. The expansive soil foundation construction as claimed in claim 1, wherein the geosynthetic reinforcement mat (2) is provided with a drainage gradient of 3 to 5% toward both sides along the center of the subgrade.
7. A construction method of an expansive soil foundation structure containing a ballastless track roadbed is characterized by comprising the following steps:
step 1: processing and binding a reinforcement cage in a prefabrication plant, assembling a template with a reserved hole on the inner side of the hollow porous pile body (11), hoisting the reinforcement cage in place, and assembling the template with the reserved hole on the outer side of the hollow porous pile body (11);
step 2: pouring concrete, curing and forming, removing the template after the concrete of the hollow porous pile body (11) reaches the strength required by the design, continuing curing to reach the design strength, and then transporting the hollow porous pile body (11) to a construction site;
and step 3: according to the arrangement position of the porous pipe piles (1), a drilling machine is adopted to drill a lead hole in advance in the expansive soil foundation (4), after the lead hole is formed, a hollow porous pile body (11) is hoisted into the lead hole, a pile driver is utilized to drive the hollow porous pile body (11) into the expansive soil foundation (4) to a depth below the atmospheric influence depth in the expansive soil foundation (4), then, an elastomer material (12) is densely filled in the hollow interior of the hollow porous pile body (11), and finally, the opening of the pile top is tightly filled, compacted and sealed by clay;
and 4, step 4: laying a geosynthetic material reinforced cushion layer (2) on the surface of the expansive soil foundation (4);
and 5: filling filler on the reinforced cushion layer (2) made of the geosynthetic material and compacting to form the ballastless track roadbed (3).
8. The construction method according to claim 7, wherein in the step 3, the hollow porous piles (11) are constructed in a sequential manner from the center of the roadbed to both sides.
9. The construction method according to claim 7, wherein in the step 4, the geosynthetic reinforcement mat (2) is provided with a drainage gradient of 3% to 5% toward both sides along the center of the roadbed.
10. The construction method according to claim 7, wherein in the step 4, the geosynthetic reinforcement mat (2) is formed by stacking a lower and middle coarse sand layer (22), a geogrid (21), an upper and middle coarse sand layer (23), a lower coarse grain soil layer (24), the geogrid (21) and an upper coarse grain soil layer (25) which are sequentially laid from bottom to top.
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| CN112553991A (en) * | 2020-11-30 | 2021-03-26 | 中交路桥建设有限公司 | Weak expansive soil old roadbed reinforcing method and widening method |
| CN114411679A (en) * | 2022-02-09 | 2022-04-29 | 新疆兵团勘测设计院(集团)有限责任公司 | Deep silt foundation treatment device and method |
| CN114960305A (en) * | 2022-04-24 | 2022-08-30 | 南昌大学 | High-speed railway subgrade lower expansive soil foundation reinforcing structure and construction method |
| CN115419056B (en) * | 2022-09-08 | 2023-07-07 | 中铁二院工程集团有限责任公司 | Reinforcing structure for resisting expansion and shrinkage deformation of foundation and design method |
| CN115418985B (en) * | 2022-10-10 | 2024-05-28 | 中铁九局集团第一建设有限公司 | Reinforced structure of transition section of expansive soil road culvert of high-speed railway and construction method thereof |
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