CN111235967A - High-speed railway water-soaking embankment structure in seasonal frozen soil area and construction method - Google Patents
High-speed railway water-soaking embankment structure in seasonal frozen soil area and construction method Download PDFInfo
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- CN111235967A CN111235967A CN202010158417.6A CN202010158417A CN111235967A CN 111235967 A CN111235967 A CN 111235967A CN 202010158417 A CN202010158417 A CN 202010158417A CN 111235967 A CN111235967 A CN 111235967A
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- 239000002689 soil Substances 0.000 title claims abstract description 34
- 230000001932 seasonal effect Effects 0.000 title claims abstract description 25
- 238000002791 soaking Methods 0.000 title abstract description 5
- 238000010276 construction Methods 0.000 title description 15
- 238000011065 in-situ storage Methods 0.000 claims abstract description 37
- 238000005192 partition Methods 0.000 claims description 19
- 239000004567 concrete Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 230000001050 lubricating effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000000945 filler Substances 0.000 description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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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
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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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- Structural Engineering (AREA)
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Abstract
The invention discloses a soaking embankment structure of a high-speed railway in a seasonal frozen soil area, which comprises an upper embankment, a lower embankment, bored cast-in-place piles, an elastic supporting layer and a bearing device, wherein the lower embankment is filled at the upper end of a foundation, the upper embankment is positioned at the upper end of the lower embankment, the elastic supporting layer is positioned at the top of the upper embankment, the bearing device is positioned at the top of the elastic supporting layer, the number of the bored cast-in-place piles is at least two, the at least two bored cast-in-place piles are arranged in the foundation at intervals in rows along the longitudinal direction of a line, at least two rows of bored cast-in-place piles are transversely arranged along the line. The cast-in-situ bored pile supports the bearing device, when the lower embankment deforms due to frost heaving, the elastic supporting layer contracts and deforms to reduce the influence of frost heaving force on the bearing device, and when the embankment does not frost heaving, the elastic supporting layer contracts and deforms to restore to provide surface supporting force for the bearing device, so that the engineering investment of the bearing device is saved, and the structure has good upward arch deformation resistance.
Description
Technical Field
The invention relates to railway engineering, in particular to a soaking embankment structure of a high-speed railway in a seasonal frozen soil area and a construction method.
Background
Seasonal frozen soil occupies more than half of the territory of China, and the construction of high-speed railway roadbed engineering in the seasonal frozen soil area is very difficult and needs to solve the problem of frost heaving, upwarp and deformation of the roadbed. At present, problems encountered when high-speed railway roadbed engineering is built in a seasonal frozen soil area are not related to water level influence, even if underground water is influenced, the underground water level is reduced by arranging a drainage blind ditch, and the key points of the problem solving at present are concentrated on two aspects of roadbed filling selection and water prevention and drainage measures. At present, no case exists for building a high-speed railway embankment submerged in water in a seasonal frozen soil area, when a ballastless track high-speed railway built in the seasonal frozen soil area meets the submerged embankment, the existing problem of deformation of an upper arch of a roadbed is more complicated and more obvious, and the problem of deformation of the upper arch is very difficult to solve.
Disclosure of Invention
The invention aims to: aiming at solving the problem of difficult upwarp deformation when a ballastless track high-speed railway is built in a seasonal frozen soil area in the prior art, the submerged embankment structure and the construction method for the high-speed railway in the seasonal frozen soil area are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-speed railway immersion embankment structure in a seasonal frozen soil area comprises an upper embankment, a lower embankment, bored cast-in-place piles, an elastic supporting layer and a bearing device;
the lower embankment is filled at the upper end of the foundation, and the upper embankment is positioned at the upper end of the lower embankment;
the elastic supporting layer is positioned at the top of the upper embankment, and the bearing device is positioned at the top of the elastic supporting layer;
the number of the cast-in-situ bored piles is at least two, the at least two cast-in-situ bored piles are arranged in the foundation at intervals along the longitudinal direction of the line, at least two rows of cast-in-situ bored piles are transversely arranged along the line, and the tops of the cast-in-situ bored piles extend out of the foundation and are fixedly connected with the bearing device.
Through the structure, the cast-in-situ bored pile supports the bearing device, and when the lower embankment deforms due to frost heaving, the elastic support layer at the bottom of the bearing device contracts and deforms, so that the influence of frost heaving force on the bearing device can be greatly reduced, and the contraction deformation recovery of the elastic support layer can provide surface support force for the bearing device when the embankment is not frost heaving, so that the engineering investment of the bearing device is saved, and the constructed immersed embankment structure has good anti-upwarp deformation capability.
As a preferred scheme of the invention, the embankment structure further comprises a geogrid, the geogrid is laid on the foundation and fixedly connected with the cast-in-situ bored pile, and the lower embankment is filled on the top of the geogrid. Through the structure, geogrid is used for the foundation reinforcement, forms stable plane with the fixed linking to each other of bored concrete pile, lower part embankment, the partition layer, upper portion embankment and elastic support layer produce under the action of gravity and subside for geogrid exerts decurrent great pulling force to bored concrete pile, the last arch frictional force that transmits for bored concrete pile when can effectively balancing lower part embankment frost heaving, thereby avoided bored concrete pile to cause top load-bearing device to produce and arch up and warp.
As a preferred scheme of the invention, the embankment structure further comprises a partition layer, the partition layer is positioned between the upper embankment and the lower embankment, the lower embankment is filled with water-permeable soil, and the upper embankment is filled with qualified filler. Through above-mentioned structure, infiltration soil filler has good water permeability, can increase the drainage of ground, reduces subsiding of ground, and the isolation layer can effectively prevent the moisture of lower part embankment upwards to migrate, avoids upper portion embankment to produce unfavorable frost heaving deformation.
As a preferable scheme of the present invention, the embankment structure further includes a track structure, and the track structure is fixedly arranged on the top of the carrying device. Through above-mentioned structure, avoid track structure to receive the influence of arching and subsiding the deformation on the railway.
As a preferable scheme of the invention, the exterior of the pile body of the cast-in-situ bored pile extending out of the foundation is provided with a lubricating material coating. Through the structure, the lubricating material outside the pile body can weaken the transmission of frost heaving force, so that the constructed embankment structure has good anti-arching deformation capability.
As a preferred scheme of the invention, the elastic supporting layer consists of a bottom plate, a spring structure, a top plate and a flexible side wall, the bottom plate, the top plate and the flexible side wall form a closed structure, the spring structure is positioned in the closed structure, and two ends of the spring structure are respectively connected with the bottom plate and the top plate. Through the structure, the spring structure can absorb and store the force which enables the embankment to generate the upward arching and sinking deformation, so that the embankment has good deformation resistance.
A construction method of a high-speed railway submerged embankment in a seasonal frozen soil area is used for constructing the embankment structure and comprises the following steps:
s1: arranging the cast-in-situ bored piles in the foundation at intervals in rows along the line in the longitudinal direction, and extending the top of the cast-in-situ bored piles out of the foundation;
s2: filling a lower embankment on the foundation;
s3: filling an upper embankment at the upper end of the lower embankment;
s4: excavating a construction elastic supporting layer at the top of the upper embankment;
s5: and the bearing device is arranged on the top of the elastic supporting layer and is fixedly connected with the top of the pile body of the cast-in-situ bored pile, which extends out of the foundation.
The construction method ensures effective realization of the functions of the embankment structure, and has the advantages of simple and convenient construction, controllable quality, good economical efficiency, environmental protection and contribution to popularization.
In a preferred embodiment of the present invention, after step S1, a lubricant is applied to the exterior of the pile body of the cast-in-situ bored pile extending out of the foundation.
In a preferred embodiment of the present invention, the embankment structure includes a partition layer between the upper and lower embankments, and the upper embankment is filled on top of the partition layer in step S3.
As a preferable aspect of the present invention, the embankment structure further includes a track structure, and the track structure is fixedly installed on the top of the carrier after the step of S5 is completed.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the cast-in-situ bored pile supports the bearing device, and when the lower embankment deformed because of frost heaving, the elastic support layer at the bottom of the bearing device contracted and deformed, so that the influence of frost heaving force on the bearing device can be greatly reduced, and the elastic support layer contracted and deformed to recover when not frost heaving can provide surface support force for the bearing device, thereby saving the engineering investment of the bearing device, and enabling the constructed submerged embankment structure to have good anti-upwarp deformation capability.
The construction method ensures effective realization of the functions of the embankment structure, and has the advantages of simple construction, controllable quality, good economy, environmental protection and contribution to popularization.
Drawings
Fig. 1 is a schematic cross-sectional view of a high-speed railway water-immersed embankment structure in a seasonal frozen soil area according to the invention.
Fig. 2 is a schematic structural view of the elastic support layer described in the present invention.
Icon: 1-drilling a cast-in-place pile; 2-geogrid; 3-lower embankment; 4-a partition layer; 5-upper embankment; 6-an elastic support layer; 61-a base plate; 62-a top plate; 63-spring configuration; 64-a flexible sidewall; 7-a carrier device; 8-track structure; a-foundation; b-highest water level line.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1-2, the present embodiment provides a submerged embankment structure for a high-speed railway in a seasonal frozen soil area, which comprises an upper embankment 5, a lower embankment 3, a geogrid 2, a partition layer 4, bored piles 1, an elastic support layer 6, a bearing device 7 and a track structure 8.
The quantity of bored concrete pile 1 is two, and bored concrete pile 1 sets up in the ground A along the vertical interval of circuit in row, transversely is equipped with two at least rows of bored concrete pile 1 along the circuit, and the top of bored concrete pile 1 stretches out ground A and with the bottom fixed connection who bears device 7, and the outside of the pile body that bored concrete pile 1 stretches out ground A has been paintd with lubricating material.
Geogrid 2 is laid on foundation A and with drilling bored concrete pile 1 fixed connection, specifically, geogrid 2 and the taut ligature fixed connection of drilling bored concrete pile 1.
And the lower embankment 3 is filled with water-permeable soil filler on the top of the geogrid 2.
Partition layer 4 sets up at the top of lower part embankment 3, and is specific, and partition layer 4 comprises well coarse sand and presss from both sides two-layer composite geomembrane, and the position of setting is higher than highest waterline B.
And the upper embankment 5 is filled at the top of the partition layer 4, and the upper embankment 5 adopts high-speed railway qualified filler.
The elastic support layer 6 is arranged on the top of the upper embankment 5, the elastic support layer 6 is composed of a bottom plate 61, a spring structure 63, a top plate 62 and a flexible side wall 64, the bottom plate 61, the top plate 62 and the flexible side wall 64 form a closed structure, the spring structure 63 is located in the closed structure, and two ends of the spring structure 63 are respectively connected with the bottom plate 61 and the top plate 62.
The rail structures 8 are two in number and are fixedly arranged on top of the carrier device 7.
The embodiment also provides a method for constructing the high-speed railway submerged embankment in the seasonal frozen soil area, which is used for constructing the embankment structure and comprises the following steps:
s1: arranging the cast-in-situ bored piles 1 in a foundation A at intervals in rows along a line in the longitudinal direction, and extending the top of the cast-in-situ bored piles 1 out of the foundation A;
specifically, connecting reinforcing steel bars are inserted into the periphery of a pile body at the intersection of the cast-in-situ bored pile 1 and the ground, the length of the reinforcing steel bars at the top of the cast-in-situ bored pile 1 extending out of the pile top is not less than 0.3m, and asphalt is applied to the outer part of the pile body extending out of the foundation A of the cast-in-situ bored pile 1 for lubrication treatment;
s2: filling a lower embankment 3 on the foundation A;
specifically, a geogrid 2 is laid on a foundation A, and is cut off when being intersected with a cast-in-situ bored pile 1, cut-off tie bars are tightly and fixedly connected with connecting steel bars of the cast-in-situ bored pile 1, the geogrid 2 is tensioned and fixed on the foundation A by adopting a geogrid bar, and a lower embankment 3 is filled at the upper end of the geogrid 2 in a layered mode;
s3: an upper embankment 5 is filled at the upper end of the lower embankment 3;
specifically, a partition layer 4 is installed on the top of the lower embankment 3, and an upper embankment 5 is constructed on the top of the partition layer 4;
s4: excavating a construction elastic supporting layer 6 at the top of the upper embankment 5;
s5: the bearing device 7 is arranged on the top of the elastic supporting layer 6 and is fixedly connected with the top of the pile body of the cast-in-situ bored pile 1 extending out of the foundation A;
specifically, the vertical mold is used for pouring bearing plate reinforced concrete and is fixedly connected with the extending reinforcing steel bars at the top of the cast-in-situ bored pile 1, and connecting reinforcing steel bars are embedded at the top of the bearing plate;
and (5) after the step S5 is completed, constructing the track structure 8 and fixedly connecting the track structure with the embedded connecting steel bars at the top of the bearing plate.
The soaking embankment structure of the high-speed railway in the seasonal frozen soil area and the construction method have the advantages that:
the number of the cast-in-situ bored piles 1 is two, the cast-in-situ bored piles 1 are longitudinally arranged in a row in a foundation A at intervals along a line, at least two rows of the cast-in-situ bored piles 1 are transversely arranged along the line, the top of each cast-in-situ bored pile 1 extends out of the foundation A and is fixedly connected with the bottom of a bearing device 7, the bearing device 7 is arranged at the top of an elastic supporting layer 6, a lower embankment 3 is filled at the top of a geogrid 2 by adopting water-permeable soil filler, when the lower embankment 3 deforms due to frost heaving, the elastic supporting layer 6 at the bottom of the bearing device 7 contracts and deforms, so that the influence of frost-heaving force on the bearing device 7 can be greatly reduced, and the elastic supporting layer 6 contracts and deforms to recover when the embankment 3 is not frost-heaving, surface supporting force can be provided for the bearing device 7, so that the engineering;
the exterior of the pile body of the cast-in-situ bored pile 1 extending out of the foundation A is coated with a lubricating material, so that the transmission of frost heaving force can be weakened, and the constructed embankment structure has good anti-arching deformation capability;
the geogrid 2 is laid on the foundation A and fixedly connected with the cast-in-situ bored pile 1, the geogrid 2 is used for reinforcing the foundation A and fixedly connected with the cast-in-situ bored pile 1 to form a stable plane, and the foundation A is settled under the action of gravity by the lower embankment 3, the partition layer 4, the upper embankment 5 and the elastic support layer 6, so that the geogrid 2 applies downward large pulling force to the cast-in-situ bored pile 1, the upward arching friction force transmitted to the cast-in-situ bored pile 1 during frost heaving of the lower embankment 3 can be effectively balanced, and the phenomenon that the cast-in-situ bored pile 1 causes the upward arching deformation of the top bearing device 7 is avoided;
the lower embankment 3 adopts water seepage soil filler, the upper embankment 5 adopts qualified filler, and the partition layer 4 is positioned between the upper embankment 5 and the lower embankment 3. The permeable soil filler has good water permeability, can increase the drainage of the foundation A and reduce the settlement of the foundation A, and the isolation layer 4 can effectively prevent the water of the lower embankment 3 from migrating upwards and avoid the upper embankment 5 from generating unfavorable frost heaving deformation;
the construction method ensures effective realization of the functions of the embankment structure, and has the advantages of simple and convenient construction, controllable quality, good economical efficiency, environmental protection and contribution to popularization.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A high-speed railway immersion embankment structure in a seasonal frozen soil area is characterized by comprising an upper embankment (5), a lower embankment (3), bored cast-in-place piles (1), an elastic supporting layer (6) and a bearing device (7);
the lower embankment (3) is filled at the upper end of a foundation (A), and the upper embankment (5) is positioned at the upper end of the lower embankment (3);
the elastic supporting layer (6) is positioned on the top of the upper embankment (5), and the bearing device (7) is positioned on the top of the elastic supporting layer (6);
the quantity of bored concrete pile (1) is at least two, at least two bored concrete pile (1) is in line longitudinal interval row setting along the route in ground (A), transversely is equipped with at least two rows along the route bored concrete pile (1), bored concrete pile (1) top stretches out ground (A) and with bear device (7) fixed the linking to each other.
2. The embankment structure for high-speed railway flooding in seasonal frozen soil area according to claim 1, characterized by further comprising a geogrid (2), wherein the geogrid (2) is laid on the foundation (A) and is fixedly connected with the cast-in-situ bored pile (1), and the lower embankment (3) is filled on top of the geogrid (2).
3. The immersed embankment structure for high-speed railways in the seasonal frozen soil area according to claim 1, further comprising a partition layer (4), wherein the partition layer (4) is located between the upper embankment (5) and the lower embankment (3), the lower embankment (3) is filled with permeable soil, and the upper embankment (5) is filled with qualified materials.
4. The embankment structure for flooding high-speed railways in seasonal frozen soil areas according to claim 1, characterized by further comprising a track structure (8), wherein the track structure (8) is fixedly arranged on top of the carrying device (7).
5. The embankment structure for flooding high-speed railways in seasonal frozen soil areas according to claim 1, characterized in that the bored pile (1) is provided with a coating of lubricating material extending outside the pile body of the foundation (a).
6. The embankment structure for high-speed railway flooding in seasonal frozen soil area according to claim 1, characterized in that the supporting resilient layer (6) is composed of a bottom plate (61), a spring structure (63), a top plate (62) and flexible side walls (64), the bottom plate (61), the top plate (62) and the flexible side walls (64) form a closed structure, the spring structure (63) is located in the closed structure, and both ends of the spring structure (63) are respectively connected with the bottom plate (61) and the top plate (62).
7. A method for constructing a submerged embankment for a high-speed railway in a seasonally frozen soil area, which is used for constructing the embankment structure according to any one of claims 1 to 6, comprising the steps of:
s1: arranging the cast-in-situ bored piles (1) in the foundation (A) at intervals in rows along the longitudinal direction of the line, and extending the top of the cast-in-situ bored piles (1) out of the foundation (A);
s2: -filling said lower embankment (3) on said foundation (a);
s3: filling the upper embankment (5) at the upper end of the lower embankment (3);
s4: excavating and constructing the elastic support layer (6) on the top of the upper embankment (5);
s5: and (3) installing the bearing device (7) on the top of the elastic supporting layer (6) and fixedly connecting the bearing device with the top of the pile body of the cast-in-situ bored pile (1) extending out of the foundation (A).
8. The method for constructing a submerged embankment for a high-speed railway in a seasonal frozen soil area according to claim 7, wherein after the step of S1 is completed, a lubricating material is applied to the outside of the pile body of the cast-in-situ bored pile (1) extending out of the foundation (A).
9. The method for constructing a flooded embankment for a high-speed railway in a seasonally frozen soil area according to claim 7, wherein the embankment structure comprises a partition layer (4), the partition layer (4) is located between the upper embankment (5) and the lower embankment (3), and the upper embankment (5) is filled on top of the partition layer (4) in the step S3.
10. The method for constructing a submerged embankment for a high-speed railway in a seasonal frozen soil area according to claim 7, wherein the embankment structure further comprises a track structure (8), and after the step of S5 is completed, the track structure (8) is fixedly installed on the top of the bearing device (7).
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| CN202010158417.6A CN111235967A (en) | 2020-03-09 | 2020-03-09 | High-speed railway water-soaking embankment structure in seasonal frozen soil area and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111945485A (en) * | 2020-08-12 | 2020-11-17 | 中铁八局集团第二工程有限公司 | High-speed railway roadbed with vibration damping and freezing prevention functions |
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