CN104631220A - High speed railway cement improved reinforced loess roadbed and construction method thereof - Google Patents
High speed railway cement improved reinforced loess roadbed and construction method thereof Download PDFInfo
- Publication number
- CN104631220A CN104631220A CN201410848981.5A CN201410848981A CN104631220A CN 104631220 A CN104631220 A CN 104631220A CN 201410848981 A CN201410848981 A CN 201410848981A CN 104631220 A CN104631220 A CN 104631220A
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- Prior art keywords
- loess
- cement
- roadbed
- layer
- speed railway
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Classifications
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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
-
- 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
Abstract
The invention discloses high speed railway cement improved reinforced loess roadbed and a construction method of the high speed railway cement improved reinforced loess roadbed. The roadbed is composed of a reinforced improved cement loess layer, a cement improved loess layer and a compacted loess layer in sequence from top to bottom, and the high speed railway roadbed settlement amount can be controlled at about 5mm by the high speed railway cement improved reinforced loess roadbed and the construction method of the high speed railway cement improved reinforced loess roadbed; by laying a geogrid into the improved cement loess layer and rolling multilayer combination materials, not only is the whole roadbed compression resisting strength and the shearing strength improved, but also the shock resisting property of foundations is strengthened. Compared with traditional high speed railway roadbed processing methods, the settlement is reduced, the vibration collapse of a loess roadbed caused by locomotive vibration can be eliminated, and the physical and mechanical property of loess can be substantially improved; the technology is simple in construction, practical, economical, and capable of guaranteeing high speed train operation safety.
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, extensively adopt conditioned soil to carry out consolidation process to roadbed at present, to solve raw subgrade Lack of support or the excessive problem of deflection, prevent engineering later stage settlement of subgrade from high-speed railway is run to the adverse effect brought.
But existing roadbed treatment mode not yet considers that bullet train vibrates the roadbed shake caused and falls into problem; The Long-term Vibration of bullet train produces certain depression to roadbed, thus makes roadbed occur differential settlement, causes high-speed railway interruption of service, therefore, need improve the performance of the resistance to compression of roadbed entirety, shearing resistance and antivibration; If merely by increasing the additive levels such as cement and improve high-speed railway subgrade bearing capacity and antivibration falling into ability, improve DeGrain, and cause the significantly raising of construction cost.
Therefore, how the meeting subgrade strengthening and eliminating on the basis of Loess Collapsibility of economical rationality, eliminates the loess subgrade caused due to locomotive vibration and shakes sunken, become those skilled in the art's problem demanding prompt solution.
Summary of the invention
For solving the problem, the invention provides a kind of high-speed railway cement improvement reinforced loess roadbed and construction method thereof, for eliminating, shaking of causing due to train vibration of loess subgrade is sunken.
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 factor is more than or equal to 4%, and coefficient of consolidation 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/m
2be of a size of 40 × 40mm; Tensile strength: longitudinal 26.09kN/m, horizontal 25.91kN/m; Elongation per unit length: longitudinal 12.3%, horizontal 12.8%.
Wherein, described loess is the Northwest Q
3and Q
2loess, described cement is P.O.32.5 level Portland cement.
Wherein, in described strength concrete pile layer, cement factor is more than or equal to 4%, and coefficient of consolidation is more than or equal to 0.92.
Wherein, in described Compacted Loess layer, the coefficient of consolidation of Compacted Loess is 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: hit reality to the loess of below buried depth 6m, by roadbed leveling compacting, after compacting, carry out an acceptance inspection, process non-compliant substrate;
The laying of S3, strength concrete pile layer: according to optimum water content, by the loess after process and cement with 4% match ratio carry out, after mix, being transported to roadbed place through lorry mounted mixer, 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, process non-compliant substrate;
The laying of S4, reinforcement improvement Cement Loess layer: according to optimum water content, by process after loess and cement with 4% match ratio carry out after mix through lorry mounted mixer, be 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 the real filling-up thickness of all the other each laminations is 20cm; Direction earthwork grille is laid respectively at buried depth 1.8m and 2.6m place;
S5, the laying of subgrade bed end face and the laying of track.
The present invention has following beneficial effect:
Can high-speed railway subgrade settling amount be controlled at about 5mm; By establishing geo-grid at improvement cement soil layer middle berth, and multiple layer combination material being rolled, not only increasing resistance to compression and the shear strength of roadbed entirety, 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, ensure 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 only in order to explain the present invention, be 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 factor is more than or equal to 4%, and coefficient of consolidation 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/m
2; Be of a size of 40 × 40mm; Tensile strength: longitudinal 26.09kN/m, horizontal 25.91kN/m; Elongation per unit length: longitudinal 12.3%, horizontal 12.8%.
Described loess is the Northwest Q
3and Q
2loess, described cement is P.O.32.5 level Portland cement.
In described strength concrete pile layer 2, cement factor is more than or equal to 4%, and coefficient of consolidation is more than or equal to 0.92.
In described Compacted Loess layer 3, the coefficient of consolidation of Compacted Loess is more than or equal to 0.92.
The embodiment of the present invention additionally provides a kind of construction method 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: hit reality to the loess of below buried depth 6m, by roadbed leveling compacting, after compacting, carry out an acceptance inspection, process non-compliant substrate;
The laying of S3, strength concrete pile layer 2: according to optimum water content, by the loess after process and cement with 4% match ratio carry out, after mix, being transported to roadbed place through lorry mounted mixer, 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, process non-compliant substrate;
The laying of S4, reinforcement improvement Cement Loess layer 1: according to optimum water content, by process after loess and cement with 4% match ratio carry out after mix through lorry mounted mixer, be 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 the real filling-up thickness of all the other each laminations is 20cm; Direction earthwork grille is laid respectively at buried depth 1.8m and 2.6m place;
S5, the laying of subgrade bed end face and the laying of 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, geo-grid lay district, detection zone; Nine flow processs are: surveying and locating, road groove base treatment, filler mixes and stirs, layering paves, flatten, roll compacting, lay geo-grid, 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 make some improvements and modifications, these improvements and modifications also should be considered 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 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 factor is more than or equal to 4%, and coefficient of consolidation 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 characterized 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/m
2; Be of a size of 40 × 40mm; Tensile strength: longitudinal 26.09kN/m, horizontal 25.91kN/m; Elongation per unit length: 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 characterized in that, described loess is the Northwest Q
3and Q
2loess, 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 characterized in that, in described strength concrete pile layer, cement factor is more than or equal to 4%, and coefficient of consolidation 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 characterized in that, in described Compacted Loess layer, the coefficient of consolidation 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, is characterized in that, comprise the steps:
Prepare and levelling of the land before S1, construction;
S2, Compacted Loess layer: hit reality to the loess of below buried depth 6m, by roadbed leveling compacting, after compacting, carry out an acceptance inspection, process non-compliant substrate;
The laying of S3, strength concrete pile layer: according to optimum water content, by the loess after process and cement with 4% match ratio carry out, after mix, being transported to roadbed place through lorry mounted mixer, 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, process non-compliant substrate;
The laying of S4, reinforcement improvement Cement Loess layer: according to optimum water content, by process after loess and cement with 4% match ratio carry out after mix through lorry mounted mixer, be 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 the real filling-up thickness of all the other each laminations is 20cm; Direction earthwork grille is laid respectively at buried depth 1.8m and 2.6m place;
S5, the laying of subgrade bed end face and the laying of track.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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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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| CN104631220A true CN104631220A (en) | 2015-05-20 |
| CN104631220B CN104631220B (en) | 2016-07-13 |
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Cited By (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 |
| 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 |
| CN111684131A (en) * | 2017-09-15 | 2020-09-18 | 坦萨技术有限公司 | Geotechnical engineering construction for railway |
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| CN106320313A (en) * | 2016-08-19 | 2017-01-11 | 西北大学 | Composite reinforced loess foundation and construction method thereof |
| CN111684131A (en) * | 2017-09-15 | 2020-09-18 | 坦萨技术有限公司 | Geotechnical engineering construction for railway |
| 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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|---|---|
| CN104631220B (en) | 2016-07-13 |
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Granted publication date: 20160713 Termination date: 20161227 |