CN111501425A - High-speed railway expansive soil dike structure and construction method - Google Patents
High-speed railway expansive soil dike structure and construction method Download PDFInfo
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- CN111501425A CN111501425A CN202010417311.3A CN202010417311A CN111501425A CN 111501425 A CN111501425 A CN 111501425A CN 202010417311 A CN202010417311 A CN 202010417311A CN 111501425 A CN111501425 A CN 111501425A
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- filling
- pile
- speed railway
- embankment
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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
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
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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
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Railway Tracks (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a high-speed railway expansive soil embankment structure and a construction method thereof. Pile structure and roof structure form the support basis of railway track structure, the roof structure stress state that is in the face contact obviously is better than the unsettled stress state of traditional road bed pile slab structure, pile slab structure warp through the friction of stake with soil, the deformation time is fast, can accomplish fast and subside deformation until stable, the pile capacity that railway track structure and train load weight were applyed is less than the weight of pile-loading pre-compaction, make the embankment structure satisfy high-speed railway's deformation control requirement, can reduce the engineering investment simultaneously.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to a high-speed railway expansive soil dike structure and a construction method thereof.
Background
When the high-speed railway constructed in the expansive land area lacks qualified roadbed filling, the investment for constructing roadbed engineering is high, the high-speed railway specification stipulates that improved expansive soil is not suitable for roadbed filling, and the expansive soil waste dug by the cutting is not beneficial to environmental protection. How to realize the economy of constructing the high-speed railway subgrade in the expansive soil area and meet the deformation control requirement of the high-speed railway is a technical problem which needs to be solved.
Therefore, the provided expansive soil embankment structure and construction method for the high-speed railway have important significance.
Disclosure of Invention
The invention aims to: aiming at the problem that the prior art cannot meet the deformation control requirement of a high-speed railway, the invention provides a high-speed railway expansive soil embankment structure and a construction method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-speed railway expanded soil embankment structure comprises a filling structure, a pile structure and a top plate structure;
the filling structure is filled above the foundation;
the pile structure penetrates through the filling structure, and the top of the pile structure extends out of the filling structure;
the top plate structure is located at the top of the filling structure and fixedly connected with the top of the pile structure, and the bottom of the top plate structure is attached to the top of the filling structure.
Through the structure, the pile structure and the top plate structure form a supporting foundation of a railway track structure, the top plate structure and the filling structure are in surface contact, the stress state is obviously better than the suspension stress state of the traditional roadbed pile plate structure, the soil foundation is in consolidation deformation, the deformation time is long, the pile structure and the top plate structure deform through the friction action of piles and soil, the deformation time is short, the sinking deformation time of the pile structure under the action of upper load is obviously shorter than the consolidation settling deformation time of the soil foundation, the settling deformation can be quickly completed until the stabilization, by utilizing the characteristic that the settling of the pile structure and the top plate structure is faster than the settling of the soil foundation, after the roadbed structure is formed, the top of the top plate structure can be preloaded, the weight of the preloaded load is larger than the sum of the loads of the track structure and a train, under the action of the loads, the pile structure and the top plate structure can be quickly settled and deformed until the stabilization, the, in the subsequent running process of the high-speed railway, the settlement deformation generated by the embankment structure is greatly reduced, so that the embankment structure meets the deformation control requirement of the high-speed railway, and meanwhile, the engineering investment can be reduced.
As a preferable scheme of the invention, at least two rows of pile structures are arranged along the width direction of the line, and a plurality of pile bodies are arranged at intervals along the length direction of the line in each row of pile structures.
In a preferred embodiment of the present invention, the filling structure includes a filling substructure and a filling skin structure, the filling substructure is filled in layers on the foundation, and the filling skin structure is filled above the filling substructure. Through above-mentioned structure, fill surface layer structure can strengthen the intensity of road bed face, is favorable to the construction operation, fill surface layer structure and fill substructure and can guarantee the stability of pile structure in the transverse direction to replace the required high-quality filler of traditional high-speed railway, practice thrift the engineering investment, reduce and abandon the sediment volume, the environmental protection simultaneously.
In a preferred embodiment of the present invention, a composite waterproof and drainage plate is laid between the lower filling structure and the upper filling structure. Through the structure, the composite water-proof and drainage plate is used for preventing the ground surface infiltration water from entering the filling substructure, so that the purpose of protecting the filling substructure is achieved, and the ground surface infiltration water can be discharged.
In the preferable scheme of the invention, the filling lower part structure adopts expansive soil, and the filling surface layer structure adopts A, B groups of fillers.
As a preferred scheme of the invention, the two sides of the filling lower structure in the width direction of the line are respectively provided with a reinforcing rib layer, each side is provided with at least two reinforcing rib layers, and the reinforcing rib layers on each side are arranged at intervals in the vertical direction. Through above-mentioned structure, the reinforced layer can strengthen the stability of adopting the fill substructure both sides side slope of inflation soil filling.
As a preferable scheme of the invention, the reinforced layer adopts geotextile or geogrid.
A construction method of a high-speed railway expansive soil dike structure comprises the following steps:
constructing an embankment structure;
carrying out preloading on the top of the top plate structure, wherein the preloading weight is greater than the sum of the high-speed railway track structure and the train load weight;
the roof structure is unloaded.
By the method, the bagged pre-compacted soil larger than the sum of the weight of the track structure and the load of the train is placed at the top of the top plate structure, the top plate structure and the pile structure generate settlement deformation under the action of the load larger than the sum of the weight of the track structure and the load of the train, the pre-compacted soil is unloaded after the settlement deformation is stable, the pile structure is stable at the moment, new settlement deformation cannot be generated under the action of the later track and the load of the train, the function of the embankment structure can be effectively realized, the operation is simple, the quality is controllable, and the popularization is facilitated.
As a preferred scheme of the present invention, after the step of unloading the roof structure is completed, a track structure foundation is constructed on the top of the roof structure.
As a preferred scheme of the invention, the step of constructing the embankment structure comprises the following steps:
laying a composite waterproof and drainage plate on the top of the filling lower part structure;
constructing a filling surface layer structure on the top of the composite waterproof and drainage plate;
constructing a pile structure at the top of the filling surface layer structure;
and constructing a top plate structure at the top of the filling surface layer structure, wherein the top plate structure is fixedly connected with the pile structure.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the pile structure and the top plate structure form a supporting foundation of a railway track structure, the top plate structure and the filling structure are in surface contact, the stress state is obviously better than the suspended stress state of the traditional roadbed pile plate structure, the soil foundation is in consolidation deformation and has long deformation time, the pile structure and the top plate structure deform through the friction action of piles and soil, the deformation time is short, the sinking deformation time of the pile structure under the action of upper load is obviously shorter than the consolidation settlement deformation time of the soil foundation, the settlement deformation can be quickly completed until the stabilization, by utilizing the characteristic that the settlement of the pile structure and the top plate structure is faster than the settlement of the soil foundation, after the roadbed structure is formed, the top of the top plate structure can be preloaded, the weight of the preloaded is larger than the sum of the loads of the track structure and a train, and under the action of the loads, the pile structure and the top plate structure quickly settle and deform until the stabilization and then the preloaded is, in the subsequent running process of the high-speed railway, the settlement deformation generated by the embankment structure is greatly reduced, so that the embankment structure meets the deformation control requirement of the high-speed railway, and meanwhile, the engineering investment can be reduced.
2. The embankment structure is simple to operate, controllable in quality and beneficial to popularization.
Drawings
Fig. 1 is a schematic structural diagram of a high-speed railway expansive soil embankment structure.
Icon: 1-pile construction; 2-fill substructure; 3-reinforcing rib layers; 4-composite water-proof and drainage plate; 5-filling the surface structure; 6-top plate construction.
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, the embodiment provides a high-speed railway expansive soil embankment structure, which comprises a filling structure, a pile structure 1, a reinforced layer 3, a composite waterproof and drainage plate 4 and a top plate structure 6;
the filling structure comprises a filling surface structure 5 and a filling lower structure 2, the filling lower structure 2 is filled above the foundation in a layered mode, the filling surface structure 5 is filled above the filling lower structure 2, specifically, the filling lower structure 2 adopts expansive soil, and the filling surface structure 5 adopts A, B groups of fillers.
Pile structure 1 buries underground in the ground and runs through the structure of filling, pile structure 1's top stretch out fill surface layer structure 5 and with roof structure 6 fixed connection, the line width direction interval along the line is equipped with two at least rows of pile structure 1, every row of pile structure 1 is equipped with a plurality of piles bodies along the line length direction interval, roof structure 6's bottom and the top laminating of filling surface layer structure 5.
Add muscle layer 3 and set up in the both sides of filling substructure 2 along the line width, the quantity that adds muscle layer 3 of every side is two-layer at least, and the muscle layer 3 of every side sets up along vertical direction interval, and is concrete, adds muscle layer 3 and adopts high-strength geotechnological cloth or geogrid, and generally every 0.6m sets up the one deck, and the width of setting is not less than 5 m.
The composite waterproof and drainage plate 4 is laid on the top of the filling lower part structure 2, the filling surface layer structure 5 is filled on the top of the composite waterproof and drainage plate 4, specifically, the composite waterproof and drainage plate 4 consists of two layers of non-woven geotextile and one layer of geonet core, and the geonet core is positioned between the two layers of non-woven geotextile and has the function of drainage and isolation.
The embodiment also provides a construction method of the high-speed railway expansive soil embankment structure, which comprises the following steps:
s1: filling a filling lower structure 2, and paving reinforcing rib layers 3 at two sides of the filling lower structure 2 at intervals;
specifically, leveling the field, filling a filling lower structure 2 on the foundation layer by layer, and paving reinforcing rib layers 3 at intervals on two sides of the filling lower structure 2;
s2: laying a composite waterproof and drainage plate 4;
specifically, a composite water-drainage-preventing plate 4 is laid on the top of a filling lower part structure 2, a construction hole is reserved at the position where the pile structure 1 is arranged, and the diameter of the reserved construction hole is 1.2-1.3 times of that of the pile structure 1;
s3: constructing a filling surface structure 5;
specifically, a filling surface layer structure 5 is constructed on the top of the composite waterproof and drainage plate 4;
s4: constructing a pile structure 1;
specifically, a pile structure 1 is constructed at the top of a filling surface layer structure 5;
s5: constructing a top plate structure 6;
specifically, a top plate structure 6 is constructed at the top of the filling surface layer structure 5, and the top plate structure 6 is fixedly connected with the pile structure 1;
s6: carrying out preloading on the top of the top plate structure 6, wherein the preloading weight is greater than the sum of the high-speed railway track structure and the train load weight;
specifically, the top of the top plate structure 6 is piled and pre-pressed by adopting bagged soil, and the piling weight of the bagged soil is 1.1-1.2 times of the sum of the high-speed railway track structure and the train load weight;
s7: unloading the roof structure 6;
specifically, after the settlement deformation of the top plate structure 6 is stable, unloading the pre-pressed bagged soil;
s8: a track structure foundation is constructed on top of the roof structure 6.
The expansive soil dike structure of the high-speed railway and the construction method have the beneficial effects that:
the pile structure 1 and the top plate structure 6 form a supporting foundation of a railway track structure, the top plate structure 6 and the filling surface layer structure 5 are always in a surface contact state, the stress state of the top plate structure 6 in the surface contact state is obviously better than the suspension stress state of the traditional roadbed pile plate structure, the embankment structure can meet the deformation control requirement of a high-speed railway, and meanwhile, the engineering investment can be reduced;
the sinking deformation of the pile structure 1 under the action of the upper load is friction pile deformation, the deformation time is fast, the deformation time is different from the long-term consolidation deformation of the soil foundation, the deformation time is obviously shorter than the consolidation settlement deformation time of the soil foundation, the settlement deformation can be rapidly completed, the characteristics that the settlement of the pile structure 1 and the roof structure 6 is faster than the settlement of the soil foundation are utilized, after the roadbed structure is formed, the top of the roof structure 6 can be preloaded, and the weight of the preloaded load is larger than the sum of the loads of the track structure and the train, under the action of the load, the pile structure 1 and the top plate structure 6 are quickly settled and deformed until the pre-pressing load is removed after the pile structure and the top plate structure are stabilized, the settlement deformation generated by the embankment structure is greatly reduced in the subsequent high-speed railway operation process, therefore, the embankment structure meets the deformation control requirement of the high-speed railway, and meanwhile, the engineering investment can be reduced;
the filling surface layer structure 5 can enhance the strength of a roadbed and is beneficial to construction operation, the filling surface layer structure 5 and the filling substructure 2 can ensure the stability of the pile structure 1 in the transverse direction and replace high-quality fillers required by the traditional high-speed railway, the engineering investment is saved, the slag discarding amount is reduced, and the environment is protected;
the composite water-proof and drainage plate 4 is used for preventing the seepage water entering the ground surface from entering the filling substructure 2, so that the purpose of protecting the filling substructure 2 is achieved, and meanwhile, the seepage water entering the ground surface can be drained;
the reinforced layer 3 can enhance the stability of the slopes on two sides of the filling substructure 2 filled with the expansive soil;
place the bagged prepressing soil that is greater than track structure and train load weight sum at roof structure 6's top, roof structure 6 and pile structure 1 together produce to subside under the load effect that is greater than track structure and train load sum and warp, unload prepressing bagged soil after subsiding deformation stabilization, pile structure 1 has been stabilized this moment, can not produce new settlement deformation under later stage track and train load effect, can effectively realize the function of above-mentioned embankment structure, and the operation is simple, and the quality is controllable, and the promotion is favorable to.
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. The high-speed railway expansive soil embankment structure is characterized by comprising a filling structure, a pile structure (1) and a top plate structure (6);
the filling structure is filled above the foundation;
the pile structure (1) penetrates through the filling structure, and the top of the pile structure (1) extends out of the filling structure;
the top plate structure (6) is located at the top of the filling structure and fixedly connected with the top of the pile structure (1), and the bottom of the top plate structure (6) is attached to the top of the filling structure.
2. The expanded dirt embankment structure for high-speed railway according to claim 1, wherein at least two rows of pile structures (1) are arranged along the width direction of the road, and a plurality of pile bodies are arranged at intervals along the length direction of the road in each row of pile structures (1).
3. The expanded embankment structure for high speed railway according to claim 1, wherein the fill structure comprises a fill substructure (2) and a fill skin structure (5), the fill substructure (2) is layered on the foundation, and the fill skin structure (5) is filled above the fill substructure (2).
4. A high speed railway expansive soil dike structure according to claim 3, wherein a composite waterproof and drainage laminate (4) is laid between the fill substructure (2) and the fill surface structure (5).
5. The expansive soil embankment structure for high-speed railway according to claim 3, wherein the filling substructure (2) adopts expansive soil, and the filling surface structure (5) adopts A, B groups of fillers.
6. A high speed railway expanded dirt embankment structure according to claim 1, wherein said fill substructure (2) is provided with reinforcement layers (3) on both sides in the width direction of the road, at least two reinforcement layers (3) are provided on each side, and said reinforcement layers (3) on each side are vertically spaced apart.
7. A high speed railway expanded dirt embankment structure according to claim 6, characterized in that the reinforcement layer (3) is made of geotextile or geogrid.
8. A construction method of a high-speed railway expansive soil embankment structure is characterized by comprising the following steps:
constructing an embankment structure;
carrying out preloading on the top of the top plate structure (6), wherein the preloading weight is greater than the sum of the high-speed railway track structure and the train load weight;
the roof construction (6) is unloaded.
9. The method for constructing a high speed railway expansive soil embankment structure according to claim 8, wherein a track structure foundation is constructed on the top of the roof structure (6) after the step of unloading the roof structure (6) is completed.
10. The method for constructing an expansive soil embankment structure for a high-speed railway according to claim 8, wherein the step of constructing the embankment structure comprises the following steps:
laying a composite waterproof and drainage plate (4) on the top of the filling lower part structure (2);
constructing a filling surface layer structure (5) on the top of the composite waterproof and drainage plate (4);
constructing a pile structure (1) at the top of the filling surface structure (5);
and constructing a top plate structure (6) at the top of the filling surface layer structure (5), and fixedly connecting the top plate structure (6) with the pile structure (1).
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| CN209873457U (en) * | 2019-01-25 | 2019-12-31 | 中国铁道科学研究院集团有限公司 | Ballastless track structure |
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2020
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| JP2011144514A (en) * | 2010-01-12 | 2011-07-28 | Railway Technical Research Institute | Airtight bag banking |
| CN204000470U (en) * | 2014-02-28 | 2014-12-10 | 中铁第四勘察设计院集团有限公司 | The U-shaped waterproof construction of high stake |
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