CN104631220B - A kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof - Google Patents
A kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof Download PDFInfo
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- CN104631220B CN104631220B CN201410848981.5A CN201410848981A CN104631220B CN 104631220 B CN104631220 B CN 104631220B CN 201410848981 A CN201410848981 A CN 201410848981A CN 104631220 B CN104631220 B CN 104631220B
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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
- E01B37/00—Making, maintaining, renewing, or taking-up the ballastway or the track, not provided for in a single one of groups E01B27/00 - E01B35/00
-
- 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
-
- 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
-
- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/123—Consolidating by placing solidifying or pore-filling substances in the soil and compacting the soil
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/08—Deep or vertical foundation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/13—Geometrical or physical properties having at least a mesh portion
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
- E02D2300/0034—Steel; Iron in wire form
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0084—Geogrids
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Railway Tracks (AREA)
Abstract
The invention discloses a kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof, described roadbed is made up of reinforcement improvement Cement Loess layer, strength concrete pile layer, Compacted Loess layer from top to bottom successively, and high-speed railway subgrade settling amount can be controlled at about 5mm by the present invention；By setting GSZ at improvement cement soil layer middle berth, and multiple layer combination material is rolled, not only increase the overall resistance to compression of roadbed and shearing strength, and the resistance to shock of the ground strengthened；Compared with traditional high-speed railway subgrade processing method, reduce sedimentation, and eliminate the loess subgrade caused due to locomotive vibration and shake sunken, inherently improve the physico-mechanical properties of loess；This construction technology is simple, practical, economical, it is ensured that bullet train operation security.
Description
Technical field
The present invention relates to a kind of consolidation roadbed of high-speed method, be specifically related to a kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof.
Background technology
In high-speed railway subgrade processing technology field, roadbed is carried out consolidation process by widely used conditioned soil at present, to solve raw subgrade Lack of support or the excessive problem of deflection, it is prevented that high-speed railway is run the adverse effect brought by engineering later stage settlement of subgrade.
But existing roadbed treatment mode not yet considers that the roadbed shake that bullet train vibration causes falls into problem；Roadbed is produced certain depression by the Long-term Vibration of bullet train, so that differential settlement occurs in roadbed, causes high-speed railway interruption of service, therefore, need to improve the performance of the overall resistance to compression of roadbed, shearing resistance and antivibration；Improve high-speed railway subgrade bearing capacity and the sunken ability of antivibration if simple by additive levels such as increase cement, improve DeGrain, and cause being greatly improved of construction cost.
Therefore, how economical rationality meeting subgrade strengthening and eliminate Loess Collapsibility basis on, eliminate the loess subgrade caused due to locomotive vibration and shake sunken, become those skilled in the art's problem demanding prompt solution.
Summary of the invention
For solving the problems referred to above, the invention provides a kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof, sunken for shaking of eliminating that loess subgrade causes due to train vibration.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of high-speed railway cement improvement reinforced loess roadbed, it is characterized in that, described roadbed is made up of reinforcement improvement Cement Loess layer, strength concrete pile layer, Compacted Loess layer from top to bottom successively, the thickness of described reinforcement improvement Cement Loess layer is 2.3m, the thickness of described strength concrete pile layer is 2.7m, described reinforcement improvement Cement Loess is the composite foundation that two-layer steel plastic geogrid combines with strength concrete pile, in described strength concrete pile, cement content is more than or equal to 4%, and compacting factor is more than or equal to 0.95.
Wherein, described steel plastic geogrid is direction earthwork grille, and inside is provided with steel wire, and its main physical and mechanical preperties is as follows: described steel plastic geogrid mass area ratio is 520g/m2It is of a size of 40 × 40mm；Tensile strength: longitudinal 26.09kN/m, horizontal 25.91kN/m；Elongation percentage: longitudinal 12.3%, horizontal 12.8%.
Wherein, described loess is the Northwest Q3And Q2Loess, described cement is P.O.32.5 level Portland cement.
Wherein, in described strength concrete pile layer, cement content is more than or equal to 4%, and compacting factor is more than or equal to 0.92.
Wherein, in described Compacted Loess layer the compacting factor of Compacted Loess more than or equal to 0.92.
The construction method of above-mentioned a kind of high-speed railway cement improvement reinforced loess roadbed, comprises the steps:
Prepare and levelling of the land before S1, construction；
S2, Compacted Loess layer: the loess of below buried depth 6m is hit reality, by roadbed leveling compacting, after compacting, carry out an acceptance inspection, non-compliant substrate processed；
S3, strength concrete pile layer laying: according to optimum moisture content, carry out, after mix, being transported to roadbed place through mixer with the match ratio of 4% by the loess after processing and cement, carry out filling, compacting operation；Filling-up thickness is 2.7m, and bottom two layers placement in layers compacted depth is 25cm, and all the other each layer placement in layers compacted depthes are 20cm, totally 13 layers, after compacting, carry out an acceptance inspection, non-compliant substrate is processed；
The laying of S4, reinforcement improvement Cement Loess layer: according to optimum moisture content, loess after process and cement are carried out after mix with the match ratio of 4% through mixer, it is transported to roadbed place, carry out smooth, pave, compacting, the construction operation such as cloth muscle, from surface layer of subgrade bed end face, fill 11 layers of strength concrete pile layer altogether to buried depth 3.3m place, bottom two layers compacting filling-up thickness is 25cm, and all the other each lamination reality filling-up thicknesses are 20cm；Direction earthwork grille is laid respectively at buried depth 1.8m and 2.6m place；
The laying of S5, the laying of subgrade bed end face and track.
The method have the advantages that
High-speed railway subgrade settling amount can be controlled at about 5mm；By setting GSZ at improvement cement soil layer middle berth, and multiple layer combination material is rolled, not only increase the overall resistance to compression of roadbed and shearing strength, and the resistance to shock of the ground strengthened；Compared with traditional high-speed railway subgrade processing method, reduce sedimentation, and eliminate the loess subgrade caused due to locomotive vibration and shake sunken, inherently improve the physico-mechanical properties of loess；This construction technology is simple, practical, economical, it is ensured that bullet train operation security.
Accompanying drawing explanation
The structural representation of a kind of high-speed railway cement improvement reinforced loess roadbed that Fig. 1 provides for the embodiment of the present invention.
In figure: 1-reinforcement improvement Cement Loess layer；2-strength concrete pile layer；3-Compacted Loess layer；4-steel plastic geogrid；5-strength concrete pile；6-bottom layer of subgrade；7, surface layer of subgrade bed.
Detailed description of the invention
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, embodiments provide a kind of high-speed railway cement improvement reinforced loess roadbed, described roadbed is made up of reinforcement improvement Cement Loess layer 1, strength concrete pile layer 2, Compacted Loess layer 3 from top to bottom successively, the thickness of described reinforcement improvement Cement Loess layer 1 is 2.3m, the thickness of described strength concrete pile layer 2 is 2.7m, described reinforcement improvement Cement Loess 1 is the composite foundation that two-layer steel plastic geogrid 4 combines with strength concrete pile 5, in described strength concrete pile 5, cement content is more than or equal to 4%, and compacting factor is more than or equal to 0.95.
Described steel plastic geogrid 4 is direction earthwork grille, and inside is provided with steel wire, and its main physical and mechanical preperties is as follows: described steel plastic geogrid mass area ratio is 520g/m2；It is of a size of 40 × 40mm；Tensile strength: longitudinal 26.09kN/m, horizontal 25.91kN/m；Elongation percentage: longitudinal 12.3%, horizontal 12.8%.
Described loess is the Northwest Q3And Q2Loess, described cement is P.O.32.5 level Portland cement.
In described strength concrete pile layer 2, cement content is more than or equal to 4%, and compacting factor is more than or equal to 0.92.
In described Compacted Loess layer 3, the compacting factor of Compacted Loess is more than or equal to 0.92.
The embodiment of the present invention additionally provides the construction method of a kind of high-speed railway cement improvement reinforced loess roadbed, comprises the steps:
Prepare and levelling of the land before S1, construction；
S2, Compacted Loess layer 3: the loess of below buried depth 6m is hit reality, by roadbed leveling compacting, after compacting, carry out an acceptance inspection, non-compliant substrate processed；
S3, strength concrete pile layer 2 laying: according to optimum moisture content, carry out, after mix, being transported to roadbed place through mixer with the match ratio of 4% by the loess after processing and cement, carry out filling, compacting operation；Filling-up thickness is 2.7m, and bottom two layers placement in layers compacted depth is 25cm, and all the other each layer placement in layers compacted depthes are 20cm, totally 13 layers, after compacting, carry out an acceptance inspection, non-compliant substrate is processed；
The laying of S4, reinforcement improvement Cement Loess layer 1: according to optimum moisture content, loess after process and cement are carried out after mix with the match ratio of 4% through mixer, it is transported to roadbed place, carry out smooth, pave, compacting, the construction operation such as cloth muscle, from surface layer of subgrade bed end face, fill 11 layers of strength concrete pile layer 1 altogether to buried depth 3.3m place, bottom two layers compacting filling-up thickness is 25cm, and all the other each lamination reality filling-up thicknesses are 20cm；Direction earthwork grille is laid respectively at buried depth 1.8m and 2.6m place；
The laying of S5, the laying of subgrade bed end face and track.
Wherein, the laying concrete operation method of reinforcement improvement Cement Loess 1 was three stages, and five is interval, nine flow processs.Three stages were: Construction in Preparatory Stage, construction stage, trimming acceptance phase；Four intervals are: reclamation district, clear area, roll district, GSZ lay district, detection zone；Nine flow processs are: surveying and locating, road groove base treatment, filler mix and stir, be layered pave, flatten, roll compacting, lay GSZ, inspection visa, slope trimming.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (6)
1. a high-speed railway cement improvement reinforced loess roadbed, it is characterized in that, described roadbed is improved Cement Loess layer (1) by reinforcement from top to bottom successively, strength concrete pile layer (2), Compacted Loess layer (3) forms, the thickness of described reinforcement improvement Cement Loess layer (1) is 2.3m, the thickness of described strength concrete pile layer (2) is 2.7m, described reinforcement improvement Cement Loess is the composite foundation that two-layer steel plastic geogrid (4) combines with strength concrete pile (5), in described strength concrete pile (5), cement content is more than or equal to 4%, compacting factor is more than or equal to 0.95.
2. a kind of high-speed railway cement improvement reinforced loess roadbed as claimed in claim 1, it is characterised in that described steel plastic geogrid is direction earthwork grille, and inside is provided with steel wire, and described steel plastic geogrid mass area ratio is 520g/m2；It is of a size of 40 × 40mm；Tensile strength: longitudinal 26.09kN/m, horizontal 25.91kN/m；Elongation percentage: longitudinal 12.3%, horizontal 12.8%.
3. a kind of high-speed railway cement improvement reinforced loess roadbed as claimed in claim 1, it is characterised in that described loess is the Northwest Q3And Q2Loess, described cement is P.O.32.5 level Portland cement.
4. a kind of high-speed railway cement improvement reinforced loess roadbed as claimed in claim 1, it is characterised in that in described strength concrete pile layer, cement content is more than or equal to 4%, and compacting factor is more than or equal to 0.92.
5. a kind of high-speed railway cement improvement reinforced loess roadbed as claimed in claim 1, it is characterised in that in described Compacted Loess layer, the compacting factor of Compacted Loess is more than or equal to 0.92.
6. the construction method of a kind of high-speed railway cement improvement reinforced loess roadbed as described in any one of claim 1-5, it is characterised in that comprise the steps:
Prepare and levelling of the land before S1, construction；
S2, Compacted Loess layer: the loess of below buried depth 6m is hit reality, by roadbed leveling compacting, after compacting, carry out an acceptance inspection, non-compliant substrate processed；
S3, strength concrete pile layer laying: according to optimum moisture content, carry out, after mix, being transported to roadbed place through mixer with the match ratio of 4% by the loess after processing and cement, carry out filling, compacting operation；Filling-up thickness is 2.7m, and bottom two layers placement in layers compacted depth is 25cm, and all the other each layer placement in layers compacted depthes are 20cm, totally 13 layers, after compacting, carry out an acceptance inspection, non-compliant substrate is processed；
The laying of S4, reinforcement improvement Cement Loess layer: according to optimum moisture content, loess after process and cement are carried out after mix with the match ratio of 4% through mixer, it is transported to roadbed place, carry out smooth, pave, compacting, cloth muscle, from surface layer of subgrade bed end face, fill 11 layers of strength concrete pile layer altogether to buried depth 3.3m place, bottom two layers compacting filling-up thickness is 25cm, and all the other each lamination reality filling-up thicknesses are 20cm；Direction earthwork grille is laid respectively at buried depth 1.8m and 2.6m place；
The laying of S5, the laying of subgrade bed end face and track.
Priority Applications (1)
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| CN201410848981.5A CN104631220B (en) | 2014-12-27 | 2014-12-27 | A kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof |
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| CN201410848981.5A CN104631220B (en) | 2014-12-27 | 2014-12-27 | A kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof |
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| CN104631220B true CN104631220B (en) | 2016-07-13 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049211A (en) * | 2016-07-27 | 2016-10-26 | 西北大学 | Railway glass fiber ribbed loess roadbed and construction method thereof |
| CN106320313A (en) * | 2016-08-19 | 2017-01-11 | 西北大学 | Composite reinforced loess foundation and construction method thereof |
| GB201714867D0 (en) * | 2017-09-15 | 2017-11-01 | Tensar Tech Ltd | Geoengineering constructions for use in railways |
| CN107489137A (en) * | 2017-09-29 | 2017-12-19 | 山西省交通科学研究院 | A kind of method that collapsible loess foundation is handled using cement soil padding |
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