High-speed railway flaky stone pile plate structure roadbed in permafrost region and construction method of high-speed railway flaky stone pile plate structure roadbed

Abstract

The invention discloses a permafrost region high-speed railway rubble pile-slab structure roadbed and a construction method thereof, and relates to the technical field of railway roadbeds, the rubble pile-slab structure roadbed comprises a pile-slab structure pile foundation, a pile-slab structure joist, a pile-slab structure bearing platform plate, a rubble roadbed and a foundation bed surface layer, the rubble roadbed comprises a sand gravel lower cushion layer, a rubble layer, a gravel upper cushion layer, a medium-coarse sand inverted filter layer and a roadbed filling layer which are sequentially arranged from bottom to top. According to the method, the flaky and blocky stone roadbed is laid below the pile-slab structure bearing platform plate, and the purpose of actively protecting the permafrost is achieved; through cooperative bearing of the pile-slab structure and the slice and block stone roadbed on the lower portion, part of load is transmitted to the pile-slab structure pile body through the pile-slab structure bearing platform plate and the pile-slab structure supporting beam and then diffused to a base, and part of load is transmitted to the slice and block stone roadbed through the pile-slab structure bearing platform plate and the pile-slab structure supporting beam and then diffused to a foundation soil body. Therefore, the purpose of controlling the settlement deformation of the flaky stone subgrade is achieved, and the stability of the railway subgrade is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of railway roadbed, and in particular to a high-speed railway block stone pile slab structure roadbed in permafrost areas and a construction method thereof. Background Art

[0002] China is the third largest frozen soil country in the world. Permafrost accounts for about 22.4% of my country's land area, mainly distributed in high-latitude and high-altitude areas such as the Qinghai-Tibet Plateau, Greater Khingan Range and Tianshan Mountains. The severe climate conditions and the existence of permafrost make the roadbed engineering diseases in permafrost areas different from those in general areas. There are many types of roadbed diseases in permafrost areas. The annual freezing and thawing cycle of the active layer of the roadbed is the root cause of the freezing and thawing diseases of the roadbed in permafrost areas. Thaw settlement caused by the melting of permafrost is the main cause of deformation and damage of the roadbed in permafrost areas. In the process of railway construction, human activities inevitably increase the heat entering the permafrost layer, causing the ground temperature to rise, leading to the melting of the permafrost layer, which directly threatens the stability of the railway roadbed, especially in high-temperature permafrost areas and areas with thick underground ice. Thaw settlement is very likely to occur.

[0003] The most widely used design principle in frozen soil projects is the permafrost protection design principle. The rubble air-cooled roadbed is an active permafrost protection roadbed that has been widely used in the permafrost section of the Qinghai-Tibet Railway. It changes the heat transfer mode by changing the embankment structure, so that the heat transferred into the embankment not only relies on the heat conduction heat transfer of soil particles, but also forms a heat transfer mechanism dominated by convection heat transfer through the gaps between the artificially created media in the embankment. Taking advantage of the climate characteristics of the plateau frozen soil area where the negative accumulated temperature is much greater than the positive accumulated temperature, the temperature field in the embankment is changed to achieve the purpose of lowering the base temperature and protecting permafrost.

[0004] The design of high-speed railways needs to take into account their high speeds and also ensure that the post-construction settlement control reaches the millimeter level. However, the existing stone air-cooled roadbed cannot meet the construction requirements. Therefore, it is urgent to provide a stone pile slab structure roadbed for high-speed railways in permafrost areas and a construction method thereof to solve the deficiencies in the existing technology. Summary of the invention

[0005] The purpose of the present invention is to provide a high-speed railway block stone pile slab structure roadbed in permafrost areas and a construction method thereof, so as to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned object, the present invention provides a high-speed railway block stone pile slab structure roadbed in permafrost areas, comprising:

[0007] Pile foundations of the pile-sheet structure are arranged at intervals along the longitudinal direction of the line, and the lower part of the pile foundations of the pile-sheet structure is buried below the upper limit of permafrost;

[0008] A pile-sheet structure joist is arranged on the top of the pile foundation of the pile-sheet structure, and the pile-sheet structure joist is arranged transversely along the line;

[0009] A pile-and-board structure capping plate is horizontally arranged above the pile-and-board structure joist, and the pile-and-board structure capping plate is located above the natural ground;

[0010] The block stone roadbed is arranged between the pile-plate structure cap plate and the natural ground, and the block stone roadbed includes a gravel lower cushion layer, a sheet stone layer, a crushed stone upper cushion layer, a medium-coarse sand filter layer and a roadbed fill layer arranged in sequence from bottom to top;

[0011] The base surface layer is arranged on the top of the pile-plate structure cap plate.

[0012] Preferably, the pile diameter of the pile foundation of the pile-sheet structure is 1.25 m, the longitudinal spacing along the line is 7 m, and the transverse spacing along the line is 3.5 m.

[0013] Preferably, the longitudinal reinforcement of the pile foundation of the pile-sheet structure is arranged throughout the entire length, and is reinforced by stirrups at one end close to the natural upper limit of the frozen soil.

[0014] Preferably, the pile foundation of the pile-board structure is rigidly connected to the pile-board structure supporting beam; the pile-board structure supporting beam is rigidly connected to the pile-board structure cap plate at the mid-span position, and the pile-board structure supporting beam is hinged to the pile-board structure cap plate at the side span position.

[0015] Preferably, the slab stone used in the slab stone layer has a uniaxial saturated compressive strength of not less than 30 MPa, a crushing value of not more than 25%, a particle size of 100 mm to 300 mm, a minimum side length of not less than 150 mm, and an aspect ratio of not more than 3.

[0016] Preferably, the paving thickness of the slab stone layer is not less than 1.0 m.

[0017] Preferably, when the height of the slab stone roadbed is ≤2.5m, the slab stone layer is paved 0.3m to 0.5m below the natural ground;

[0018] When the height of the slab stone roadbed is greater than 2.5 m, the slab stone layer is paved 0.3 m to 0.5 m above the natural ground.

[0019] Preferably, the filler gravel particle size of the gravel lower cushion layer is 30mm-50mm, and the thickness of the gravel lower cushion layer is 0.2m; the filler gravel particle size of the crushed stone upper cushion layer is 10mm-30mm, and the thickness of the crushed stone upper cushion layer is 0.2m.

[0020] Preferably, a cap plate expansion joint is provided between two adjacent cap plates of the pile-plate structure, and the cap plate expansion joint is provided corresponding to the supporting beam of the pile-plate structure.

[0021] The present invention provides a construction method for a high-speed railway block stone pile slab structure roadbed in permafrost regions, comprising the following steps:

[0022] Prefabrication of pile foundation, pile-sheet structure joist and pile-sheet structure cap slab, planning and arranging the prefabrication site according to the prefabrication, transportation and hoisting technology of prefabricated components;

[0023] Level and compact the natural ground;

[0024] The pile foundation of the pile-sheet structure is constructed by using the pile-sinking construction method;

[0025] The rubble roadbed is filled in layers, where the rubble layer is filled in a pouring manner and filled to the designed height at one time, and then compacted after leveling and filling;

[0026] Determine the installation method of the pile-sheet structure joist, wherein the installation method includes integral prefabrication installation and / or segmented prefabrication installation; before installing the pile-sheet structure joist, check whether the installation position on the pile-sheet structure joist is consistent with the installation position on the pile-sheet structure pile foundation, and hollow out the fill body at the installation position of the pile-sheet structure joist on the block stone roadbed;

[0027] Installation of pile-sheet structure cap plate;

[0028] The rails are laid after the surface layer of the base bed above the pile-sheet structure cap is filled and compacted to meet the requirements.

[0029] Compared with the prior art, the present invention has the following advantages and technical effects:

[0030] 1. The block stone pile-slab structure roadbed for high-speed railway in permafrost area provided by the present invention has the pile-slab structure and the lower block stone roadbed bearing in cooperation, part of the load is transferred to the pile body of the pile-slab structure through the pile-slab structure cap plate and the pile-slab structure support beam, and then diffused to the base, and part of the load is transferred to the block stone roadbed through the pile-slab structure cap plate and the pile-slab structure support beam, and then diffused to the foundation soil, so as to achieve the purpose of controlling the settlement and deformation of the block stone roadbed. The "thermal semiconductor" effect and forced convection effect of the stone layer of the block stone roadbed increase the cold reserve of the shallow foundation and reduce the ground temperature, thereby protecting the permafrost. The lifting of the upper limit of the permafrost is conducive to maintaining the lateral friction resistance of the pile foundation of the shallow pile-slab structure, and reducing the adverse effect of the degradation of the shallow frozen soil on the negative friction resistance of the pile foundation of the pile-slab structure.

[0031] 2. The pile-board structure has strong integrity and good stability, and has the advantages of relatively simple design and convenient construction. The slab stones of the slab layer maintain the thermal stability of the pile foundation of the pile-board structure, and the slab stone roadbed shares the overlying load, which can appropriately reduce the length of the pile foundation of the pile-board structure, greatly reduce the construction difficulty and the thermal disturbance of the pile foundation construction of the pile-board structure on the frozen soil, and reduce the project cost.

[0032] 3. The active cooling effect of the ground temperature by the stone blocks paved along the route can reduce the problem of damage to the road surface flatness caused by the uneven longitudinal settlement of the stone blocks roadbed. The rigid cap plate of the pile-plate structure can avoid the cracking of the stone blocks roadbed caused by the uneven lateral deformation of the stone blocks roadbed.

[0033] 4. The pile-slab structure is applied to the roadbed in permafrost areas to control the foundation settlement and deformation damage. At the same time, the stone roadbed is laid under the pile-slab structure cap to actively protect the permafrost. The two work together to ensure the stability of the railway roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a longitudinal section layout diagram of the block stone pile slab structure roadbed of the high-speed railway in permafrost areas of the present invention;

[0036] Figure 2 for Figure 1 The cross-sectional layout along the AA direction;

[0037] Figure 3 for Figure 1 The cross-sectional layout along the BB direction;

[0038] Figure 4 It is a plan view of the block stone pile slab structure roadbed of the high-speed railway in permafrost areas of the present invention;

[0039] Figure 5 It is a layered schematic diagram of the block stone roadbed of the present invention;

[0040] In the figure: 1. Pile foundation of pile-sheet structure; 2. Support beam of pile-sheet structure; 3. Capping plate of pile-sheet structure; 4. Block stone roadbed; 5. Surface layer of base bed; 6. Sand and gravel lower cushion layer; 7. Stone layer; 8. Crushed stone upper cushion layer; 9. Medium-coarse sand filter layer; 10. Roadbed fill layer; 11. Expansion joint of capping plate. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0042] like Figures 1 to 5 As shown, the present invention provides a high-speed railway block stone pile slab structure roadbed in permafrost areas, comprising:

[0043] The pile foundations 1 of the pile-sheet structure are arranged at intervals along the longitudinal direction of the line, and the lower part of the pile foundations 1 of the pile-sheet structure is buried below the upper limit of the permafrost;

[0044] The pile-sheet structure joist 2 is arranged on the top of the pile foundation 1 of the pile-sheet structure, and the pile-sheet structure joist 2 is arranged transversely along the line;

[0045] The pile-sheet structure cap plate 3 is horizontally arranged above the pile-sheet structure joist 2, and the pile-sheet structure cap plate 3 is located above the natural ground;

[0046] The block stone roadbed 4 is arranged between the pile-sheet structure cap plate 3 and the natural ground, and the block stone roadbed 4 includes a gravel lower cushion layer 6, a sheet stone layer 7, a crushed stone upper cushion layer 8, a medium-coarse sand filter layer 9 and a roadbed fill layer 10 arranged in sequence from bottom to top;

[0047] The base surface layer 5 is arranged on the top of the pile-plate structure cap plate 3 .

[0048] According to the further optimization scheme, the pile diameter of the pile foundation 1 of the pile-sheet structure is 1.25m, the longitudinal spacing along the line is 7m, and the transverse spacing along the line is 3.5m.

[0049] According to a further optimization scheme, the longitudinal reinforcement of the pile foundation 1 of the pile-sheet structure is arranged throughout the entire length, and is reinforced by stirrups at one end close to the natural upper limit of the frozen soil.

[0050] According to a further optimization scheme, the pile foundation 1 of the pile-sheet structure is rigidly connected to the pile-sheet structure supporting beam 2; the pile-sheet structure supporting beam 2 is rigidly connected to the pile-sheet structure cap plate 3 at the mid-span position, and the pile-sheet structure supporting beam 2 is hinged to the pile-sheet structure cap plate 3 at the side span position.

[0051] According to a further optimization scheme, the slab stone used in the slab stone layer 7 has a uniaxial saturated compressive strength of not less than 30 MPa, a crushing value of not more than 25%, a particle size of 100 mm to 300 mm, a minimum side length of not less than 150 mm, and an aspect ratio of not more than 3.

[0052] According to a further optimization scheme, the paving thickness of the slab stone layer 7 is not less than 1.0 m.

[0053] Further optimization scheme, when the height of the slab stone roadbed 4 is ≤2.5m, the slab stone layer 7 is paved 0.3m to 0.5m below the natural ground;

[0054] When the height of the slab stone roadbed 4 is greater than 2.5 m, the slab stone layer 7 is paved 0.3 m to 0.5 m above the natural ground.

[0055] According to the further optimization scheme, the filler gravel particle size of the gravel lower cushion layer 6 is 30mm-50mm, and the thickness of the gravel lower cushion layer 6 is 0.2m; the filler gravel particle size of the crushed stone upper cushion layer 8 is 10mm-30mm, and the thickness of the crushed stone upper cushion layer 8 is 0.2m.

[0056] According to a further optimization scheme, a cap plate expansion joint 11 is provided between two adjacent cap plates 3 of the pile-plate structure, and the cap plate expansion joint 11 is provided corresponding to the pile-plate structure support beam 2 .

[0057] The present invention provides a construction method for a high-speed railway block stone pile slab structure roadbed in permafrost regions, comprising the following steps:

[0058] Prefabrication of pile foundation 1, pile-sheet structure joist 2 and pile-sheet structure cap slab 3, planning and arranging the prefabrication site according to the prefabrication, transportation and hoisting technology of prefabricated components;

[0059] Level and compact the natural ground;

[0060] The pile foundation 1 of the pile-sheet structure is constructed by using a driven pile construction method;

[0061] The slab stone roadbed 4 is filled in layers, wherein the slab stone layer 7 is filled in a pouring manner and filled to the designed height at one time, and then compacted after leveling and filling;

[0062] Determine the installation method of the pile-sheet structure joist 2, wherein the installation method includes integral prefabrication installation and / or segmented prefabrication installation; before installing the pile-sheet structure joist 2, check whether the installation position on the pile-sheet structure joist 2 is consistent with the installation position on the pile-sheet structure pile foundation 1, and hollow out the filling body at the installation position of the pile-sheet structure joist 2 on the block stone roadbed 4;

[0063] Installation of pile-sheet structure cap plate 3;

[0064] After the subgrade surface layer 5 above the pile-sheet structure cap slab 3 is filled and compacted to meet the requirements, the rails are laid.

[0065] Example

[0066] A construction method for a high-speed railway block stone pile slab structure roadbed in permafrost regions comprises the following steps:

[0067] Step 1: Factory prefabrication of pile-slab structure pile foundation 1; the prefabrication site planning and layout should be specially designed, and the prefabrication, transportation and lifting technology of prefabricated components should be considered;

[0068] The pile diameter of pile foundation 1 of the pile-sheet structure is 1.25m. The pile-sheet structure is arranged in a matrix, with a longitudinal pile spacing of 7.0m and a transverse pile spacing of 3.5m.

[0069] The pile foundation 1 of the pile-sheet structure is prefabricated with C35 concrete; after the prefabrication of the pile foundation 1 of the pile-sheet structure is completed, it is hoisted and transported to the site and constructed using the sinking pile construction method;

[0070] Step 2: Filling of block stone roadbed 4; Checking the source of stone material and transportation conditions, and conducting a review and test of the filling material; Before the construction of block stone roadbed, a test section should be built, and the compaction process and parameters should be determined through field tests;

[0071] The quality of the stone blocks should be tested before filling to ensure that they meet the quality requirements of the stone blocks;

[0072] The paving stone roadbed includes a gravel lower cushion layer 6, a paving stone layer 7, a crushed stone upper cushion layer 8, a medium-coarse sand filter layer 9 and a roadbed fill layer 10; wherein the filler particle size of the paving stone layer 7 is 100mm-300mm, the filler particle size of the gravel lower cushion layer 6 is 30mm-50mm, and the filler particle size of the crushed stone upper cushion layer 8 is 10mm-30mm;

[0073] The uniaxial saturated compressive strength of the flake stone shall not be less than 30MPa, the crushing value shall not be greater than 25%, the minimum side length shall be greater than 150mm, and the slenderness ratio shall not be greater than 3;

[0074] The paving thickness of the block stone layer should not be less than 1.0m, the thickness of the gravel lower cushion layer 6 should be 0.2m, and the thickness of the crushed stone upper cushion layer 8 should be 0.2m;

[0075] Before construction, the base should be treated, the ground should be leveled, and compacted with a heavy roller;

[0076] Step 3: prefabricate the pile-sheet structure joist 2 in the factory; based on the structural characteristics, transportation capacity, lifting capacity, and convenience of construction of the pile-sheet structure joist 2, determine whether to adopt overall prefabrication installation or segmented prefabrication installation;

[0077] The pile-slab structure joist 2 is 0.85m high, 1.6m wide (along the line direction), and 7.4m long (perpendicular to the line direction), and is cast with C35 concrete;

[0078] The pile-sheet structure joist 2 and the pile-sheet structure pile foundation 1 are rigidly connected;

[0079] Before installing the prefabricated components of the pile-sheet structure joist 2, it is necessary to first check whether the position of the reserved slot (hole) of the pile-sheet structure joist 2 is consistent with the corresponding position of the pile foundation 1 of the pile-sheet structure. If there is a deviation, appropriate measures should be taken to adjust it;

[0080] Before the pile-sheet structure joist 2 is hoisted and spliced, the stone roadbed 4 at the location of the pile-sheet structure joist 2 should be excavated;

[0081] Arrangement 4: Factory prefabricated pile-sheet structure cap slab 3; the pile-sheet structure cap slab 3 is 0.8m thick, each unit is 21m long (along the line direction), 7m wide (perpendicular to the line direction), and is cast with C35 concrete;

[0082] A capping plate expansion joint 11 is arranged every 21m along the line direction on the capping plate 3 of the pile-sheet structure, and the capping plate expansion joint 11 is 2cm wide;

[0083] The pile-sheet structure cap slab 3 of the side span is overlapped with the pile-sheet structure joist 2, and the pile-sheet structure cap slab 3 of the middle span is rigidly connected with the pile-sheet structure joist 2;

[0084] Step 5: fill the base surface layer 5 above the pile-sheet structure cap plate 3, and lay the rails after the base surface layer 5 is filled and compacted to meet the requirements.

[0085] The present invention uses the combined structure of the pile-board structure and the block stone roadbed 4, and utilizes the forced convection effect and "thermal semiconductor" effect of the block stone to increase the cold storage of the shallow foundation, thereby protecting the permafrost; the lifting of the upper limit of the permafrost is conducive to maintaining the lateral friction of the shallow pile foundation, and reducing the adverse effect of the degradation of the shallow frozen soil on the negative friction of the pile foundation. Utilizing the synergistic bearing of the pile-board structure and the block stone roadbed 4, part of the load is transferred to the pile-board structure pile foundation 1 through the pile-board structure cap plate 3 and the pile-board structure support beam 2, and then diffused to the foundation soil, and part of the load is transferred to the block stone roadbed 4 through the pile-board structure cap plate 3 and the pile-board structure support beam 2, and then diffused to the foundation soil, thereby achieving the purpose of controlling the settlement and deformation of the roadbed. Due to the maintenance of the thermal stability of the pile-board structure pile foundation 1 by the block stone (active cooling) and the sharing of the overlying load by the block stone roadbed 4, the pile length of the pile-board structure pile foundation 1 can be appropriately reduced, reducing the engineering cost. In addition, the active cooling effect of the ground temperature of the fully paved stones along the line direction can reduce the problem of damage to the road surface flatness caused by the uneven longitudinal settlement of the stone roadbed 4; the rigid pile-sheet structure cap plate 3 of the pile-sheet structure can avoid the cracking of the stone roadbed 4 caused by the uneven lateral deformation of the stone roadbed 4.

[0086] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-speed railway block stone pile slab structure roadbed in permafrost areas, characterized in that: include: Pile foundations (1) of a pile-sheet structure are arranged at intervals along the longitudinal direction of the line, and the lower part of the pile foundations (1) of the pile-sheet structure is buried below the upper limit of permafrost; A pile-sheet structure joist (2) is arranged on the top of the pile foundation (1) of the pile-sheet structure, and the pile-sheet structure joist (2) is arranged transversely along the line; A pile-sheet structure capping plate (3) is horizontally arranged above the pile-sheet structure joist (2), and the pile-sheet structure capping plate (3) is located above the natural ground; A block stone roadbed (4) is arranged between the pile-plate structure foundation plate (3) and the natural ground, and the block stone roadbed (4) comprises a gravel lower cushion layer (6), a stone layer (7), a crushed stone upper cushion layer (8), a medium-coarse sand filter layer (9) and a roadbed fill layer (10) arranged in order from bottom to top; The base bed surface layer (5) is arranged on the top of the pile-plate structure cap plate (3).

2. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 1, characterized in that: The pile diameter of the pile foundation (1) of the pile-sheet structure is 1.25 m, the longitudinal spacing along the line is 7 m, and the transverse spacing along the line is 3.5 m.

3. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 1, characterized in that: The longitudinal reinforcement of the pile foundation (1) of the pile-sheet structure is arranged throughout the entire length, and is reinforced by stirrups at one end close to the natural upper limit of the frozen soil.

4. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 1, characterized in that: The pile foundation (1) of the pile-sheet structure is rigidly connected to the pile-sheet structure supporting beam (2); the pile-sheet structure supporting beam (2) is rigidly connected to the pile-sheet structure cap plate (3) at the mid-span position, and the pile-sheet structure supporting beam (2) is hinged to the pile-sheet structure cap plate (3) at the side span position.

5. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 1, characterized in that: The slab stones used in the slab stone layer (7) have a uniaxial saturated compressive strength of not less than 30 MPa, a crushing value of not more than 25%, a particle size of 100 mm to 300 mm, a minimum side length of not less than 150 mm, and an aspect ratio of not more than 3.

6. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 5, characterized in that: The paving thickness of the slab stone layer (7) is not less than 1.0 m.

7. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 6, characterized in that: When the height of the slab stone roadbed (4) is ≤2.5m, the slab stone layer (7) is paved 0.3m to 0.5m below the natural ground; When the height of the slab stone roadbed (4) is greater than 2.5 m, the slab stone layer (7) is paved 0.3 m to 0.5 m above the natural ground.

8. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 1, characterized in that: The filler gravel of the gravel lower cushion layer (6) has a particle size of 30 mm to 50 mm, and the thickness of the gravel lower cushion layer (6) is 0.2 m; the filler gravel of the crushed stone upper cushion layer (8) has a particle size of 10 mm to 30 mm, and the thickness of the crushed stone upper cushion layer (8) is 0.2 m.

9. The permafrost region high-speed railway block stone pile slab structure roadbed according to claim 1, characterized in that: A capping plate expansion joint (11) is provided between two adjacent capping plates (3) of the pile-plate structure, and the capping plate expansion joint (11) is provided corresponding to the supporting beam (2) of the pile-plate structure.

10. A method for constructing a high-speed railway stone pile slab structure roadbed in permafrost regions according to any one of claims 1 to 9, characterized in that: The following steps are involved: Prefabrication of the pile foundation (1), the pile-sheet structure joist (2) and the pile-sheet structure cap plate (3), and planning and arranging the prefabrication site according to the prefabrication, transportation and hoisting process of the prefabricated components; Level and compact the natural ground; The pile foundation (1) of the pile-sheet structure is constructed by using a driven pile construction method; The slab stone roadbed (4) is filled in layers, wherein the slab stone layer (7) is filled in a pouring manner and filled to the designed height at one time, and then compacted after leveling and filling; Determine the installation method of the pile-sheet structure joist (2), wherein the installation method includes integral prefabrication installation and / or segmented prefabrication installation; before installing the pile-sheet structure joist (2), check whether the installation position on the pile-sheet structure joist (2) is consistent with the installation position on the pile-sheet structure pile foundation (1), and hollow out the fill body at the installation position of the pile-sheet structure joist (2) corresponding to the block stone roadbed (4); Installation of the pile-sheet structure cap plate (3); The rails are laid after the surface layer (5) of the base bed above the pile-sheet structure cap plate (3) is filled and compacted to meet the requirements.

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