CN108532380A - A kind of railway bed bedding cored structure of windy and sandy area - Google Patents
A kind of railway bed bedding cored structure of windy and sandy area Download PDFInfo
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- CN108532380A CN108532380A CN201810436771.3A CN201810436771A CN108532380A CN 108532380 A CN108532380 A CN 108532380A CN 201810436771 A CN201810436771 A CN 201810436771A CN 108532380 A CN108532380 A CN 108532380A
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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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/02—Receptacles, e.g. flower-pots or boxes; Glasses for cultivating flowers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Environmental Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a kind of railway bed bedding cored structure of windy and sandy area, this kind of bedding cored structure mainly applies to windy and sandy area, is suitable for the widely distributed section of Along Railway Sand-Accumulated Silt Sand.Affiliated railway is mixed passenger and freight railway, and design speed per hour is less than 200km/h Ballast tracks, and surface layer of subgrade bed design thickness is 0.6m, is mainly filled by the good land pebble of grading, while the transverse drainage slope of roadbed both sides is no less than 4%.For roadbed bottom using the cored structure of land pebble and Extra-fine sand composition, bottom layer of subgrade design thickness is 1.9m, the gradient 1：1.75 1:2.0.Roadbed bottom both sides are filled with Extra-fine sand, and center is filled with the land pebble of certain ratio of slope, form a kind of cored structure；One layer of direction earthwork grille is laid between bottom layer of subgrade and surface layer of subgrade bed.Subgrade bed cored structure of the present invention, can meet《Railway bed design specification》（TB10001‑2016）Requirement for roadbed adapts to the railway construction of windy and sandy area environment, has saved cost.
Description
Technical field
The invention belongs to apply to the railway bed field of structural design of windy and sandy area, especially a kind of iron of windy and sandy area
Road subgrade bed cored structure.
Background technology
Subgrade bed is the basis of bearing track and train load, belongs to the earth structure to work in complex condition,
Under the comprehensive function of the factors such as train cyclic loading and climatic environment, the effect of long-term circulation power and accumulating plastic deformation
Line construction deformation is would potentially result in, the military service performance of roadbed is influenced.Existing foundation bed structure is all based on greatly elastic theory frame
Intensity under frame and Deformation control condition.Strength control condition is determined premised on filler does not destroy, Deformation control condition
Really rule is the deformation requirements being subject to no more than a certain determination.
The railway of desert area, surrounding filler distribution feature are：Coarse grained soil filler is opposite to be lacked, A, B group filler maximum fortune
Away from having reached 96km.Widely distributed along the line to have drift-sand, drift-sand has grading not based on the fine sand of flour sand or disproportionately graded
It is good, without stickiness, natural moisture content is small, poor water retention property, water penetration is strong, depression is fast, full water easily compacting and capillary water height is small
The features such as, according to《Railway bed design specification》（TB10001-2016）Classification to filler, Sand-Accumulated Silt Sand belong to C3 groups and fill out
Material, cannot meet requirement of the specification to bottom layer of subgrade filler, therefore, it is necessary to take the road structure form of reasonable to ensure
When Extra-fine sand is as roadbed bottom filler, roadbed can meet the requirement of upper load and deformation.
Existing railway bed structural research is primarily present the deficiency of following aspect：1, existing railway bed structure design
It is unfolded mainly for the excellent situation of soil property, specification is unsatisfactory for for filling property and the poor subgrade engineering of construction environment is built
If correlative study it is less；2, the design of Special Roadbed structure lacks further investigation, special in roadbed dynamic stress transfer law, power
Property and Settlement Deformation Rules research in terms of need to be goed deep into；3, in numerical analysis process, software analysis can not be fully achieved with
The degree being actually consistent, part conclusion is up for further proving；4, the structure design, construction method of cored roadbed, after
Phase safeguards and the research of monitoring etc. is less, and theoretical foundation and engineering experience relatively lack.
Invention content
The purpose of the present invention is to provide a kind of railway bed bedding cored structures of windy and sandy area, not for filling property
Meet code requirement and the poor windy and sandy area of construction environment, bedding can be carried out as filler using original Extra-fine sand
Bottom fills, and reduces cost of building the road.
The object of the present invention is achieved like this, a kind of railway bed bedding cored structure of windy and sandy area, including embankment,
Bottom layer of subgrade land pebble packing layer is set in the middle part of the top surface of embankment, the thickness of the packing layer is 1.9m, the two of the packing layer
Side grade of side slope is 1:1.0-1.5, Extra-fine sand packing layer, Extra-fine sand filler is respectively set on the embankment of the packing layer both sides
The outside grade of side slope of layer is 1:1.75 1：2.0, straw checkerboard barrier sand is respectively set in the outside side slope of Extra-fine sand packing layer
Barrier, the grid size of straw checkerboard barrier sand-protecting barrier are 1m × 1m, on grid line plant have wheat straw or a straw, wheat straw or straw basset height
Degree is 20-25cm, implantation depth 15cm；On the top surface of the bottom layer of subgrade land pebble packing layer and Extra-fine sand packing layer
Direction earthwork grille layer is set, is covered above geogrids layer and surface layer of subgrade bed land pebble packing layer is set, surface layer of subgrade bed
Thickness is 0.6m, and the gradient of surface layer of subgrade bed both sides side slope is 1:1.5.
The content of road structure design mainly carries out inspection calculation to intensity and two aspect of malformation.China's passenger-cargo co iron
When road and Existing railway promotion foundation bed structure design mostly use strength control method, due to surface layer of subgrade bed filler and compaction compared with
Good, there is no problem for its own intensity, and protection lower part, which is banketed, just becomes most basic requirement, therefore to act on bottom layer of subgrade bankets
Dynamic stress no more than banketing allowable stress condition in order to control.Railway bed bedding cored structure is a kind of discontented in bedding filler
The non-laminar road structure form that roadbed bearing load and resistance capacity to deformation can be effectively improved when sufficient code requirement, in swelled ground
There is certain application prospect in the Subgrade soils such as area, desert area region.
The technical solution adopted in the present invention is by designing a kind of railway bed bedding that can apply to windy and sandy area
Cored structure, structure design include surface layer of subgrade bed and bottom layer of subgrade, and being characterized mainly in that for this design takes full advantage of wind
The original land pebble in sand ground area forms the structure type of bottom layer of subgrade cored with the widely distributed Sand-Accumulated Silt Sand in downline road,
By proposing that suitable railway bed bedding cored structure mainly solves under the premise of meeting upper load and deformation requirements
The problem of bottom layer of subgrade lacks high quality filler, so as to largely reducing project cost.
In specific design, according to specification《Railway bed design specification》（TB10001-2016）, railway bed bedding
Structure should meet the requirement of intensity and deformation, need to ensure its train load, precipitation, drying and watering cycle and Frozen-thawed cycled etc. because
There are long-time stability under the influence of element.
In specific design, the design speed per hour of the circuit is 160km/h, so the subsoil within the scope of bottom layer of subgrade
Basic bearing ability should be not less than 150kPa.
In specific design, railway belongs to mixed passenger and freight railway, and the thickness of surface layer of subgrade bed is set as 0.6m, while foundation
《Railway bed design specification》（TB10001-2016）, the shape of road bed should be set as triangular shaped, and road is arranged
The transverse drainage slope of base both sides is no less than 4%, and the Slope Design gradient of surface layer of subgrade bed is 1：1.5.
In specific design, affiliated railway is mixed passenger and freight railway, and the thickness of bottom layer of subgrade is set as 1.9m, while institute
It states bottom layer of subgrade both sides transverse drainage slope and is not preferably less than 4%, the Slope Design gradient of bottom layer of subgrade is 1：2.
In specific design, railway belongs to mixed passenger and freight railway, and design speed per hour is 160km/h, surface layer of subgrade bed it is optional
Filler classification preferentially selects A1, A2 group filler in gravel class, rubble class, secondly in gravel class, rubble class and sandy soil
B1, B2 filler.
In specific design, bottom layer of subgrade uses the road structure of cored, and the form of structure is by the cross-section of road structure
Face is observed and is divided into three parts from left to right, is filled by Extra-fine sand filler with right part on the left of subgrade cross section, middle part
Divide and is then filled by the land pebble filler being distributed along the line.
In specific design, the middle section of bottom layer of subgrade is filled by land pebble, and it is trapezoid that land pebble, which fills shape,
The gradient 1：M, wherein m value ranges 1.0~1.5.Hem width degree on trapezoid, i.e., the width for the part that is in contact with surface layer of subgrade bed, with
Top train Load Distribution Width is equal.
When carrying out subgrade construction, one can be laid between bottom layer of subgrade and surface layer of subgrade bed later by having filled bottom layer of subgrade
Layer direction earthwork grille can play the stability of enhancing bottom layer of subgrade both sides and middle section, slow down dynamic load wherein in this way
The effect of distribution ensures that roadbed bottom can reach《Railway bed design specification》（TB10001-2016）Want substantially
It asks.
In further design, is needed in windy and sandy area while considering to protect railway bed, it is anti-to carry out roadbed
When shield design, need to follow basic principle to be adaptation to local conditions, safe and reliable, economic and practical, suitable for managing and protecting, taking into account landscape original
Then, while rock and soil properties and climatic environment in conjunction with side slope are needed.
It in windy and sandy area, needs to take certain Sand-fixing Measures in roadbed both sides, side can be carried out using straw checkerboard barrier sand-protecting barrier
Slope is fixed the sand processing, and straw checkerboard barrier sand-protecting barrier is mainly to be spread on the side slope surface of roadbed with the stalk of the plants such as wheat straw, straw and reed
It is set as grid in flakes, the principle for the treatment of desertification with grass square is the grains of sand and the relatively small axis of proportion that sand-protecting barrier makes proportion larger
Stalk forms a kind of composite construction, reduces eolian erosion, strong wind action is resisted to play.
Main effective effect of the present invention is to be combined with local resources, makes full use of money widely distributed along the line
Source reaches and gathers materials on the spot, and saves the purpose of construction cost.By on-site inspection find along it is widely distributed be Extra-fine sand, belong to
C3 group fillers, are not achieved the requirement of bedding filler, if long-distance sand transport high quality filler, causes cost to increase considerably, so
It is combined with Extra-fine sand using existing land pebble, a kind of railway bed bedding cored knot being suitable for local windy and sandy area of invention
Structure combines the superperformance of two kinds of fillers, so as to meet in construction《Railway bed design specification》（TB10001-
2016）Requirement for roadbed, and it is adapted to windy and sandy area environment railway construction, save cost.
Description of the drawings
Below in conjunction with attached drawing, the present invention is described in further detail.
Fig. 1 is embodiment railway bed bedding cored structure transverse face schematic diagram；
Fig. 2 is embodiment roadbed side slope straw checkerboard barrier sand-protecting barrier structural schematic diagram.
Specific implementation mode
A kind of railway bed bedding cored structure of windy and sandy area, as shown in Figure 1 and Figure 2, including embankment 6, in the top surface of embankment 6
Bottom layer of subgrade land pebble packing layer 2 is set in portion, and the thickness of the packing layer 2 is 1.9m, the both sides grade of side slope of the packing layer 2
It is 1:1.0-1.5, be respectively set Extra-fine sand packing layer 3 on the embankment 6 of 2 both sides of packing layer, Extra-fine sand packing layer 3 it is outer
Side grade of side slope is 1:1.75 1：2.0, straw checkerboard barrier sand-protecting barrier 5 is respectively set in the outside side slope of Extra-fine sand packing layer 3, grass
The grid size of grid sand-protecting barrier 5 is 1m × 1m, and being transplanted on grid line has wheat straw or straw 7, and wheat straw or straw 7 basset highly
For 20-25cm, implantation depth 15cm；On the top surface of the bottom layer of subgrade land pebble packing layer 2 and Extra-fine sand packing layer 3
Direction earthwork grille layer 4 is set, and surface layer of subgrade bed land pebble packing layer 1, surface layer of subgrade bed is arranged in 4 top covering of geogrids layer
The thickness of land pebble packing layer 1 is 0.6m, and the gradient of 1 both sides side slope of surface layer of subgrade bed land pebble packing layer is 1:1.5.
Railway bed bedding cored structure for a kind of windy and sandy area invented, the concrete construction method of roadbed is such as
Under：
1, construction uses the construction process of general subgrade：Preparation of construction, foundation stabilization, bedding bottom and lower part fill, bedding table
Layer fills, entirety is checked and accepted.
2, when being filled to bedding, it is divided into three phases：Preparation stage, construction stage and last finishing rank
Section.For the railway bed bedding cored structure of invention, main construction is still adopted difference lies in the sequence of construction of bottom layer of subgrade
First the fine silty layer of both sides is filled, using " simultaneously, while implementing to be layered with the form of construction work of placement in layers
The form of construction work of compacting is filled in layering, symmetrical, level." every layer for powder fine sand soil construction terminate after again to middle section
Cobble soil layer is filled.Bull-dozer paving and leveling, vibrated roller vibrating compacting, it is ensured that every layer are used after the completion of every layer of construction
It fills finally parallel with road bed.
3, it needs to take safeguard measure to environment in work progress, avoids causing environment larger pollution, to generation
Pollutant is also required to be focused on.
4, after bottom layer of subgrade construction is completed, the laying of TGXG is carried out, integral construction completes later side slope again
The protection works of both sides-straw checkerboard barrier sand-protecting barrier is constructed.
5, it constructs, is as follows to straw checkerboard barrier：
A, leveling processing is carried out to the bedding side slope for having filled completion, removes rubble existing for surface；
B, hanging wire or the grid cable of 1m × 1m is pulled using lime line in slope surface, because with reference to the correlative study of forefathers,
The square of 1m × 1m is a reasonable size of straw checkerboard barrier sand-protecting barrier cell；
C, the preparation of grass planting, for, firstly the need of some water are spilt, the purpose done so is to improve material on the material of straw checkerboard barrier
Flexibility, avoid carrying out straw checkerboard barrier being broken off when rolling；
D, it is disposed across the stalk of the wheat straw either plants such as straw is bundles of on grid line, is inserted into the stalk of plant with spade
It within sand bed, allows the both ends of stalk to tilt, stands upright on Shamian Island, the implantation depth of plant is 15cm, and the height basseted is about
20~25cm。
In above-mentioned steps 3, carry out needing to choose before the filling of large area representative location as test section,
Come parameters such as the physico-mechanical properties that obtain filler, wherein the physical property of the land pebble and Sand-Accumulated Silt Sand filler that carry out
Index and Static and dynamical behavior experimental study are as follows：
1, screening and compaction test are carried out to land pebble, screening, particle specific gravity is carried out to Sand-Accumulated Silt Sand, hit real, maximum and most
Fine pore obtains basic physical property index than experiment.For land pebble：Carry out the grade that sieve test determines land pebble filler
Match；It carries out compaction test and determines maximum dry density and optimum moisture content.For Extra-fine sand：It carries out sieve test and determines that aeolian accumulation powder is thin
The grading of sand filler；It carries out compaction test and determines maximum dry density and optimum moisture content；It carries out specific gravity of soil partical experiment and determines grogs
Proportion；The relative density test for carrying out Extra-fine sand determines the minimum and maximum void ratio of Extra-fine sand.
2, carry out static triarial test, system research land pebble and Extra-fine sand indoors in different water cut, compactness and enclose
Static mechanical performance under the conditions of pressure, including intensity index and deformation index with different water cut, compactness and confining pressure variation
Rule provides parameter for the research of dynamic triaxial tests scheme, bottom layer of subgrade bearer properties and deformation characteristic.
3, carry out dynamic triaxial tests indoors, system research land pebble and Extra-fine sand filler are in different water cut, compactness
With the dynamic performance under the conditions of confining pressure, including fatigue resistance, Dynamic Elastic Module, critical dynamic stress, flexible deformation, accumulating plastic deformation etc.
With the changing rule of moisture content, compactness and confining pressure, provided for the research of indoor model test, numerical simulation and parameter of structure design
With reference to and foundation.
Claims (1)
1. a kind of railway bed bedding cored structure of windy and sandy area, including embankment, it is characterized in that：It is set in the middle part of the top surface of embankment
Bottom layer of subgrade land pebble packing layer is set, the thickness of the packing layer is 1.9m, and the both sides grade of side slope of the packing layer is 1:1.0—
1.5, Extra-fine sand packing layer is respectively set on the embankment of the packing layer both sides, the outside grade of side slope of Extra-fine sand packing layer is 1:
1.75 1：2.0, straw checkerboard barrier sand-protecting barrier is respectively set in the outside side slope of Extra-fine sand packing layer, the grid of straw checkerboard barrier sand-protecting barrier is big
Small is 1m × 1m, and being transplanted on grid line has wheat straw or straw, and it is highly 20-25cm, implantation depth that wheat straw or straw, which basset,
For 15cm；Direction earthwork grille is set on the top surface of the bottom layer of subgrade land pebble packing layer and Extra-fine sand packing layer
Surface layer of subgrade bed land pebble packing layer is arranged in layer, the covering of geogrids layer top, and the thickness of surface layer of subgrade bed is 0.6m, surface layer of subgrade bed
The gradient of both sides side slope is 1:1.5.
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| CN201810436771.3A CN108532380A (en) | 2018-05-09 | 2018-05-09 | A kind of railway bed bedding cored structure of windy and sandy area |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912758A (en) * | 2020-06-30 | 2020-11-10 | 太原理工大学 | Test device and method for measuring drainage capacity of ballast track bed in different dirty states |
| CN112746540A (en) * | 2020-12-24 | 2021-05-04 | 龙建路桥股份有限公司 | Construction method for reinforcing aeolian sand to pass through roadbed in geocell |
| CN115299282A (en) * | 2022-05-27 | 2022-11-08 | 中国科学院、水利部成都山地灾害与环境研究所 | Method for soil stabilization and sand adjustment of slope |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912758A (en) * | 2020-06-30 | 2020-11-10 | 太原理工大学 | Test device and method for measuring drainage capacity of ballast track bed in different dirty states |
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| CN112746540A (en) * | 2020-12-24 | 2021-05-04 | 龙建路桥股份有限公司 | Construction method for reinforcing aeolian sand to pass through roadbed in geocell |
| CN115299282A (en) * | 2022-05-27 | 2022-11-08 | 中国科学院、水利部成都山地灾害与环境研究所 | Method for soil stabilization and sand adjustment of slope |
| CN115299282B (en) * | 2022-05-27 | 2023-09-19 | 中国科学院、水利部成都山地灾害与环境研究所 | Method for soil fixation and sand adjustment of slope |
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Application publication date: 20180914 |