CN104018403B - A kind of method of construction of Subgrade of Heavy-haul Railway bedding - Google Patents
A kind of method of construction of Subgrade of Heavy-haul Railway bedding Download PDFInfo
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- CN104018403B CN104018403B CN201410288757.5A CN201410288757A CN104018403B CN 104018403 B CN104018403 B CN 104018403B CN 201410288757 A CN201410288757 A CN 201410288757A CN 104018403 B CN104018403 B CN 104018403B
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Abstract
The method of construction of a kind of Subgrade of Heavy-haul Railway bedding, described subgrade bed is applicable to the heavy haul railway of design axle weight 30t, thickness of ballast bed 0.35m, and its way is to construct successively from bottom to up on embankment: K30Coefficient is 90MPa/m～109MPa/m, thickness be 1.8m bedding under bottom; K30Coefficient is 110MPa/m～129MPa/m, thickness be 1.5m bedding in bottom; K30Coefficient is 130MPa/m～149MPa/m, thickness is bottom on the bedding of 0.6m; K30Coefficient is 150MPa/m～189MPa/m, thickness is the bedding layer of 0.3m; K30Coefficient >=190MPa/m, thickness are the bedding upper epidermis of 0.3m. Subgrade of Heavy-haul Railway bedding long-time stability that this method is built up and good endurance, fill source scope is wide, and it is low to build cost, builds the time short.
Description
Technical field
The present invention relates to railway construction technical field, particularly relate to the method for construction of a kind of Subgrade of Heavy-haul Railway bedding.
Background technology
At present, heavy haul railway transport worldwide develops rapidly, and heavy haul transport by the internationally recognized principal direction for railway freight development, becomes the important trend of world's railway development. Railroad track is laid on railway roadbed, and railway roadbed is built again on the line tower foundation structures such as roadbed, bridge or tunnel. Roadbed is compared with bridge, tunnel, and in heavy haul railway line tower foundation structure, proportion is higher, generally individually more than 50%. Therefore, heavy haul railway payes attention to the design-build of subgrade engineering especially.
Heavy haul railway heavily increases due to train axle and organizes into groups increase, and the continuous dynamic load amplitude that roadbed bears and effect number of times significantly increase, embankment load feature generation significant change. Wherein, train axle heavily increases and Adjacent vehicles distance between axles reduces the size and the depth of interaction that affect dynamic load, thus affecting thickness of subgrade bed. Train marshalling list increase causes that the continuous action number of times that roadbed bears increases, so that the accumulation pore pressure in filler is difficult to timely dissipation, causes the reduction of effective dynamic stress and the direct reduction of bedding intensity, causes bedding to destroy.
Roadbed under existing heavy haul railway railway roadbed is made up of the embankment below bedding and bedding, and bedding is made up of surface layer of subgrade bed and bottom layer of subgrade double-layer structure system. Bedding is under bearing the long-term cyclic load of train, not only to meet requirement of strength after being open to the traffic, also need to meet long-time stability and life requirement under train cyclic loading, but tradition foundation bed structure does not consider the Long-term Cyclic Loading impact on each Laminate construction thickness of bedding. When China's mixed passenger and freight railway is built with Existing railway promotion, constructing of foundation bed structure adopts strength control method more, with act on bottom layer of subgrade banket on dynamic stress be not more than allowable stress of banketing for control condition. Though the bedding adopting the method banket can meet be open to the traffic after requirement of strength, but the requirement of accumulated deformation under the long-term cyclic load of train (long-time stability and durability) can not be met.And, only have top layer and bottom double-layer structure system, the transition level of its carrying is few, thicker double-layer structure is both needed to meet certain intensity and accumulated deformation requirement, then the integral thickness of corresponding filling property and compaction and bedding is required height, thus causing that the cost of roadbed construction is excessive, build overlong time. Otherwise, if lowering the requirement, then its accumulated deformation increase can cause subgrade defect, affects train conevying efficiency and safe operation.
Summary of the invention
The goal of the invention of the present invention is to provide the method for construction of a kind of Subgrade of Heavy-haul Railway bedding, the Subgrade of Heavy-haul Railway bedding that this method is built up, requirement of strength after being open to the traffic can not only be met, moreover it is possible to meet the accumulated deformation requirement under train cyclic loading, its long-time stability and good endurance; And the cost of subgrade bed build is little, builds the time short.
This invention address that the first technical scheme that its technical problem adopts is, a kind of method of construction of Subgrade of Heavy-haul Railway bedding, described subgrade bed is applicable to the heavy haul railway of design axle weight 30t, thickness of ballast bed 0.35m, and its specific practice is to construct successively from bottom to up on embankment:
K30Coefficient is 90MPa/m～109MPa/m, thickness be 1.8m bedding under bottom;
K30Coefficient is 110MPa/m～129MPa/m, thickness be 1.5m bedding in bottom;
K30Coefficient is 130MPa/m～149MPa/m, thickness is bottom on the bedding of 0.6m;
K30Coefficient is 150MPa/m～189MPa/m, thickness is the bedding layer of 0.3m;
K30Coefficient >=190MPa/m, thickness are the bedding upper epidermis of 0.3m.
This invention address that the second technical scheme that its technical problem adopts is, a kind of method of construction of Subgrade of Heavy-haul Railway bedding, described subgrade bed is applicable to the heavy haul railway of design axle weight 30t, thickness of ballast bed 0.5m, and its specific practice is to construct successively from bottom to top on embankment:
K30Coefficient is 90MPa/m～109MPa/m, thickness be 3.1m bedding under bottom;
K30Coefficient is 110MPa/m～129MPa/m, thickness be 0.3m bedding in bottom;
K30Coefficient is 130MPa/m～149MPa/m, thickness is bottom on the bedding of 0.3m;
K30Coefficient is 150MPa/m～189MPa/m, thickness is the bedding layer of 0.3m;
K30Coefficient >=190MPa/m, thickness are the bedding upper epidermis of 0.3m.
Compared with prior art, the invention has the beneficial effects as follows
One, the Subgrade of Heavy-haul Railway bedding of the present invention is changed on bedding upper epidermis, bedding layer, bedding in bottom, bedding into 5 Rotating fields systems of bottom under bottom and bedding by traditional surface layer of subgrade bed and bottom layer of subgrade double-layer structure system. Owing in the bedding that vehicular load causes, stress is decayed gradually along with the degree of depth increase of bedding, therefore, the bedding upper epidermis maximum for vehicle load builds into K best in quality30The filling-material structure layer of coefficient >=190MPa/m, each structure sheaf quality reduces successively from top to bottom, K30Coefficient value gradually reduces, and under the bedding of most bottom surface, bottom is only required to be 90MPa/m≤K30The common fillers structure sheaf of < 110MPa/m. Theoretical checking computations prove: each structure sheaf all can meet be open to the traffic after requirement of strength, also can meet the accumulated deformation requirement under train cyclic loading, its long-time stability and good endurance.
Two, the Subgrade of Heavy-haul Railway bedding that the present invention builds, quality is good, K30The bedding upper epidermis thickness of >=190MPa/m is only 0.3m, and requires minimum (90MPa/m≤K30< 110MPa/m) bedding under underlayer thickness reach 1.8m or 3.1m, in the middle of its bedding, the filling property of each structure sheaf and compacting requirement are also below standard to filling property and compacting requirement of the bottom layer of subgrade of existing double-layer structure system, thus the present invention is under ensureing the premise of roadbed long-time stability and durability, require to reduce to filling property, fill source extensively, be easy to get;The compacting requirement of filler is also greatly reduced; Thus greatly reducing the cost of roadbed construction and the time of construction.
Three, the control thickness that filler is rolled by ordinary circumstance site operation is every layer of 0.3～0.5m, the each Laminate construction thickness of Subgrade of Heavy-haul Railway bedding that the present invention builds essentially conventional construction rolling controls the multiple of thickness (0.3m), grinding operation to filler when facilitating site operation, is easier to filling compaction to respective standard simultaneously.
Further, the filler that in first, second two schemes of the present invention, each structure sheaf of bedding uses is:
The filling material that described bedding upper epidermis uses is graded broken stone or graded sand gravel, coefficient of compaction K >=0.97 after compacting, dynamic deformation modulus Evd>=55MPa;
The filling material that described bedding layer uses is A group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that on described bedding, bottom uses is B group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The C group filler that filling material is coarse-grained soil that in described bedding, bottom uses, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that under described bedding, bottom uses is C group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd≥40MPa。
So, for the stress of each structure sheaf of bedding and construct feature, it is gradually lowered packing quality and the requirement rolling character from top to bottom, each structure sheaf filler is made to be prone to be densified to its corresponding construction standard, meet its intensity and accumulated deformation (long-time stability and durability) requirement, effectively reduce time and the cost of the construction of roadbed construction simultaneously.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 is the cross-sectional configuration schematic diagram of the Subgrade of Heavy-haul Railway bedding (including railway roadbed above and following embankment) that the embodiment of the present invention one method is built.
Fig. 2 is the cross-sectional configuration schematic diagram of the Subgrade of Heavy-haul Railway bedding (including railway roadbed above and following embankment) that the embodiment of the present invention two method is built.
Fig. 1, Fig. 2 are numbered 0 for railway roadbed.
Detailed description of the invention
Embodiment one
Fig. 1 illustrates, a kind of detailed description of the invention of the present invention is, the method for construction of a kind of Subgrade of Heavy-haul Railway bedding, and described subgrade bed is applicable to the heavy haul railway of design axle weight 30t, thickness of ballast bed 0.35m, its specific practice is, constructs successively from bottom to up on embankment 6:
K30Coefficient is 90MPa/m～109MPa/m, thickness be 1.8m bedding under bottom 5;
K30Coefficient is 110MPa/m～129MPa/m, thickness be 1.5m bedding in bottom 4;
K30Coefficient is 130MPa/m～149MPa/m, thickness is bottom 3 on the bedding of 0.6m;
K30Coefficient is 150MPa/m～189MPa/m, thickness is the bedding layer 2 of 0.3m;
K30Coefficient >=190MPa/m, thickness are the bedding upper epidermis 1 of 0.3m.
In this example:
The filling material that described bedding upper epidermis 1 uses is graded broken stone or graded sand gravel, coefficient of compaction K >=0.97 after compacting, dynamic deformation modulus Evd>=55MPa;
The filling material that described bedding layer 2 uses is A group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that on described bedding, bottom 3 uses is B group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The C group filler that filling material is coarse-grained soil that in described bedding, bottom 4 uses, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that under described bedding, bottom 5 uses is C group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd≥40MPa。
Embodiment two
Fig. 2 illustrates, the another kind of detailed description of the invention of the present invention is, the method for construction of a kind of Subgrade of Heavy-haul Railway bedding, and described subgrade bed is applicable to the heavy haul railway of design axle weight 30t, thickness of ballast bed 0.5m, its specific practice is, constructs successively from bottom to top on embankment 6:
K30Coefficient is 90MPa/m～109MPa/m, thickness be 3.1m bedding under bottom 5 ';
K30Coefficient is 110MPa/m～129MPa/m, thickness be 0.3m bedding in bottom 4 ';
K30Coefficient is 130MPa/m～149MPa/m, thickness is bottom 3 ' on the bedding of 0.3m;
K30Coefficient is 150MPa/m～189MPa/m, thickness is the bedding layer 2 ' of 0.3m;
K30Coefficient >=190MPa/m, thickness are the bedding upper epidermis 1 ' of 0.3m.
In this example:
The filling material that described bedding upper epidermis 1 ' uses is graded broken stone or graded sand gravel, coefficient of compaction K >=0.97 after compacting, dynamic deformation modulus Evd>=55MPa;
The filling material that described bedding layer 2 ' uses is A group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that on described bedding, bottom 3 ' uses is B group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that in described bedding, bottom 4 ' uses is the C group filler of coarse-grained soil, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that under described bedding, bottom 5 ' uses is C group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd≥40MPa。
The definition of A group filler, B group filler and C group filler that the present invention uses, refers to The Ministry of Railway of the People's Republic of China, MOR " railway bed design specification " (TB10001-2005).
Claims (4)
1. a method of construction for Subgrade of Heavy-haul Railway bedding, described subgrade bed is applicable to the heavy haul railway of design axle weight 30t, thickness of ballast bed 0.35m, and its specific practice is, constructs successively from bottom to up on embankment (6):
K30Coefficient is 90MPa/m～109MPa/m, thickness be 1.8m bedding under bottom (5);
K30Coefficient is 110MPa/m～129MPa/m, thickness be 1.5m bedding in bottom (4);
K30Coefficient is 130MPa/m～149MPa/m, thickness is bottom (3) on the bedding of 0.6m;
K30Coefficient is 150MPa/m～189MPa/m, thickness is the bedding layer (2) of 0.3m;
K30Coefficient >=190MPa/m, thickness are the bedding upper epidermis (1) of 0.3m.
2. the method for construction of a kind of Subgrade of Heavy-haul Railway bedding according to claim 1, is characterized in that:
The filling material that described bedding upper epidermis (1) uses is graded broken stone or graded sand gravel, coefficient of compaction K >=0.97 after compacting, dynamic deformation modulus Evd>=55MPa;
The filling material that described bedding layer (2) uses is A group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that on described bedding, bottom (3) uses is B group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The C group filler that filling material is coarse-grained soil that in described bedding, bottom (4) uses, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that under described bedding, bottom (5) uses is C group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
A group filler, B group filler and the C group filler that described A group filler, B group filler and C group filler respectively The Ministry of Railway of the People's Republic of China, MOR " railway bed design specification " (TB10001-2005) specify.
3. a method of construction for Subgrade of Heavy-haul Railway bedding, described subgrade bed is applicable to the heavy haul railway of design axle weight 30t, thickness of ballast bed 0.5m, and its specific practice is, constructs successively from bottom to top on embankment (6):
K30Coefficient is 90MPa/m～109MPa/m, thickness be 3.1m bedding under bottom (5 ');
K30Coefficient is 110MPa/m～129MPa/m, thickness be 0.3m bedding in bottom (4 ');
K30Coefficient is 130MPa/m～149MPa/m, thickness is bottom (3 ') on the bedding of 0.3m;
K30Coefficient is 150MPa/m～189MPa/m, thickness is bedding layer (2 ') of 0.3m;
K30Coefficient >=190MPa/m, thickness are bedding upper epidermis (1 ') of 0.3m.
4. the method for construction of a kind of Subgrade of Heavy-haul Railway bedding according to claim 3, is characterized in that:
The filling material that described bedding upper epidermis (1 ') uses is graded broken stone or graded sand gravel, coefficient of compaction K >=0.97 after compacting, dynamic deformation modulus Evd>=55MPa;
The filling material that described bedding layer (2 ') uses is A group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that on described bedding, bottom (3 ') uses is B group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that in described bedding, bottom (4 ') uses is the C group filler of coarse-grained soil, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
The filling material that under described bedding, bottom (5 ') uses is C group filler, coefficient of compaction K >=0.95 after compacting, dynamic deformation modulus Evd>=40MPa;
A group filler, B group filler and the C group filler that described A group filler, B group filler and C group filler respectively The Ministry of Railway of the People's Republic of China, MOR " railway bed design specification " (TB10001-2005) specify.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106065549B (en) * | 2016-06-14 | 2017-05-24 | 同济大学 | Railway geocell reinforcing roadbed scheme fast determining method |
| CN106555368B (en) * | 2017-01-22 | 2018-08-14 | 中铁二院工程集团有限责任公司 | Saline soil area high-speed railway embankment reinforcing construction |
| CN111914337B (en) * | 2020-08-10 | 2024-01-30 | 中铁第四勘察设计院集团有限公司 | Roadbed foundation bed structure of heavy haul railway and determination method thereof |
| CN113047087B (en) * | 2021-04-18 | 2022-07-29 | 中铁二院工程集团有限责任公司 | Design method of multilayer high-speed railway foundation bed structure |
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| CN101663437A (en) * | 2007-04-24 | 2010-03-03 | 亨内克股份有限公司 | The method and apparatus that is used for the foam filling of railway roadbed |
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| CN102251442A (en) * | 2010-05-21 | 2011-11-23 | 拜耳材料科技(中国)有限公司 | Polyurethane ballast layer as well as preparation method and application thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4397241A (en) * | 1979-09-19 | 1983-08-09 | Newman George R | System for laying a separation fabric on the subgrade of a railroad bed |
| JP2003293301A (en) * | 2002-03-29 | 2003-10-15 | Railway Technical Res Inst | Road-bed ballast material |
| CN101663437A (en) * | 2007-04-24 | 2010-03-03 | 亨内克股份有限公司 | The method and apparatus that is used for the foam filling of railway roadbed |
| CN102251442A (en) * | 2010-05-21 | 2011-11-23 | 拜耳材料科技(中国)有限公司 | Polyurethane ballast layer as well as preparation method and application thereof |
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