CN101153475B - Redbeds mudstone filled high-speed railway subgrade and construction method thereof - Google Patents

Redbeds mudstone filled high-speed railway subgrade and construction method thereof Download PDF

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Publication number
CN101153475B
CN101153475B CN200710050182A CN200710050182A CN101153475B CN 101153475 B CN101153475 B CN 101153475B CN 200710050182 A CN200710050182 A CN 200710050182A CN 200710050182 A CN200710050182 A CN 200710050182A CN 101153475 B CN101153475 B CN 101153475B
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subgrade
mudstone
bed
filled
roadbed
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CN200710050182A
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Chinese (zh)
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CN101153475A (en
Inventor
魏永幸
蒋关鲁
朱颖
李海光
王智猛
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中铁二院工程集团有限责任公司
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Abstract

The invention discloses a red bed mudstone filled-up express railway subgrade and construction method thereof. The subgrade consists of a red bed mudstone filling layer (3), a subgrade bed (2) and a track concrete foundation (1) which are filled on a subgrade base (4) in sequence, wherein, a cross section of the subgrade is of rectangle, the surface of the subgrade adopts a fully-closed water-proof structure (5), a slope of the subgrade is provided with a slope protection structure (6) and strengthened by a slope strengthening structure (11), a waterproof and drainage cushion (7) is arranged between the subgrade base (4) and the bottom surface of the red bed mudstone filling layer (3). The subgrade has the characteristics of high strength, small deformation, good stability and durability,economy, etc., and can fulfill the requirements of high smoothness, stability and durability of ballastless tracks to lines. The construction method is of simple craftwork, reasonable technology, andeasy control of filling quality; cost used for purchasing and transporting high-quality fillers can be greatly saved, waste soils caused when the subgrade is filled can be reduced, environment is protected. The invention has important economic and social benefits.

Description

Redbeds mudstone filled high-speed railway subgrade and construction method thereof
Technical field
The present invention relates to railway bed and construction method thereof, particularly a kind of in the high-speed railway engineering with Redbeds mudstone filled track base without broken stones and construction method thereof.
Background technology
Ballastless track on the high-speed railway ballastless track proposes requirement, particularly soil subgrade very high to the ride comfort of circuit, stability, durability etc., the settlement amount after construction of the base base that satisfies the need and differential settlement amount all have strict restriction.In general, track base without broken stones should adopt high quality filler such as A, B group filler etc. to fill.
Red-bed mudstone is a kind of special coarse grain class filler, and its particle is easily broken, and intensity is low, and easy disintegrating also has weak dilatancy with softening behind the chance water, shows and the general different engineering mechanics property of filler.It is extensive that China's west and south district railway construction is faced with red beds branch, and the problem that high quality filler lacks is particularly outstanding.China also lacks the rational method that uses red-bed mudstone in the high-speed railway engineering at present, therefore, press for and carry out the application study of red-bed mudstone in the high-speed railway track base without broken stones, propose the Redbeds mudstone filled roadbed and the construction method thereof of use of a cover system.
Summary of the invention
One of technical problem to be solved by this invention provides a kind of Redbeds mudstone filled high-speed railway subgrade, this roadbed has intensity height, little, the stability of distortion and good endurance, economic dispatch characteristics, can adapt to ballastless track to circuit high ride, stability, durability requirement.
The technical solution adopted for the present invention to solve the technical problems is: Redbeds mudstone filled high-speed railway subgrade of the present invention, the cross section of this roadbed is trapezoidal, red-bed mudstone packing course, subgrade bed, the track concrete foundation of being filled by order in the roadbed substrate constitute, it is characterized in that: totally-enclosed water proof structure is adopted on the road surface of described roadbed, and roadbed side slope has the slope protection structure and reinforced by the slope reinforcement structure; Be provided with anti-drainage blanket between described roadbed substrate and the red-bed mudstone packing course bottom surface.
In technique scheme, slope protection, slope reinforcement and perfect waterproof, drainage measure have comprehensively been adopted, therefore Redbeds mudstone filled roadbed of the present invention have that intensity height, distortion are little, stability and good endurance, economic dispatch characteristics, can adapt to ballastless track to circuit high ride, stability, durability requirement.
Another technical problem to be solved by this invention provides a kind of construction method of above-mentioned Redbeds mudstone filled high-speed railway subgrade.
The technical solution adopted for the present invention to solve the technical problems is: the construction method of Redbeds mudstone filled roadbed as claimed in claim 1 of the present invention, comprise the steps: 1. to handle the roadbed substrate and prepare sub-layer, the basic bearing capacity of roadbed substrate is not less than 200kpa, and embankment completion groundwork settlement after construction is not more than 15mm; Prepare the red-bed mudstone filler; Placement in layers red-bed mudstone packing course, and carry out the construction of slope reinforcement structure; Filling roadbed bedding; Fill the track concrete foundation; Carry out slope protection structure and subgrade and pavement and adopt totally-enclosed water proof structure construction.
The construction method of Redbeds mudstone filled high-speed railway subgrade of the present invention, technology is simple, and technology is reasonable; fill system easy to control the quality; can save the expense that is used to buy, transport high quality filler in a large number, also can reduce spoir, protection environment when filling roadbed, have important economy and society benefit.
Description of drawings
This manual comprises following nine width of cloth accompanying drawings:
Fig. 1 is the structural map section of Redbeds mudstone filled high-speed railway subgrade of the present invention;
Fig. 2 is the structural map section of Redbeds mudstone filled high-speed railway subgrade of the present invention;
Fig. 3 is the top structural map section of Redbeds mudstone filled high-speed railway subgrade of the present invention;
Fig. 4 is the structural representation that reinforcement is reinforced structure in the Redbeds mudstone filled high-speed railway subgrade of the present invention;
Fig. 5 is the structural representation that reinforcement is reinforced structure in the Redbeds mudstone filled high-speed railway subgrade of the present invention;
Fig. 6 is the enlarged diagram of local A among Fig. 2;
Fig. 7 is the enlarged diagram of local B among Fig. 1 and Fig. 2;
Fig. 8 is the structural representation of domatic protective construction in the Redbeds mudstone filled high-speed railway subgrade of the present invention;
Fig. 9 is the structural representation of domatic protective construction in the Redbeds mudstone filled high-speed railway subgrade of the present invention.
Position and pairing mark among the figure: track concrete foundation 1, subgrade bed 2, red-bed mudstone packing course 3, roadbed substrate 4, totally-enclosed water proof structure 5, slope protection structure 6, rhone 6a, anti-drainage blanket 7, sand gravel layer 7a, composite earthwork rete 7b, waterproof bed course 8, medium-sand seam 8a, composite earthwork rete 8b, gutter 9, slope reinforcement structure 11, the short muscle material of geo-grid 11a, the long muscle material of geo-grid 11b.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
See figures.1.and.2, Redbeds mudstone filled high-speed railway subgrade of the present invention, the cross section of this roadbed is trapezoidal, red-bed mudstone packing course 3, subgrade bed 2, the track concrete foundation 1 of being filled by order in roadbed substrate 4 constitute.For making roadbed have good stable, the height of described red-bed mudstone packing course 3 should be less than 8m, and the side slope form adopts linear pattern, and the side slope ratio of slope is preferably 1: 1.8; According to local amount of precipitation feature, roadbed both sides curb 9 should respectively be widened 0.6~1.0m than the standard roadbed.For the intensity that improves roadbed and reduce its distortion, roadbed side slope has slope protection structure 6 and is reinforced by slope reinforcement structure 11.For strengthening the waterproof and the drainage performance of roadbed, be provided with anti-drainage blanket 7 between described roadbed substrate 4 and red-bed mudstone packing course 3 bottom surfaces.
Roadbed substrate 4 should meet following condition: basic bearing capacity is not less than 200kpa, and embankment completion groundwork settlement after construction is not more than 15mm.
With reference to Fig. 3, described subgrade bed 2 can adopt A, the B group filler of 0.4m graded broken stone+2.3m graded broken stone to fill.Between described subgrade bed 2 bottom surfaces and red-bed mudstone packing course 3 end faces herringbone weathering (gradient is generally 4%) is set, and is equipped with waterproof bed course 8 betwixt.With reference to Fig. 6, described waterproof bed course 8 is made of medium-sand seam 8a and middle folded one deck composite earthwork rete 8b thereof, and the thickness of medium-sand seam 8a is generally 20cm.Carry out draining, water proof processing by anti-7 pairs of subgrade beds of drainage blanket 2.With reference to Fig. 7, described anti-drainage blanket 7 is made of sand gravel layer 7a and middle folded one deck composite earthwork rete 7b thereof, and the common thickness of sand gravel layer 7a is 40cm.Composite earthwork rete 7b should lay along the subgrade cross section direction, adopts ultrasonic bonding between the width of cloth and the width of cloth.Composite geo-membrane 7b, 7b adopt the composite geo-membrane of " geotextiles--geomembrane--geotextiles " structure, and its geotextiles is a non-woven geotextile, and every square of weight is not less than 100g, and the thickness of geomembrane is not less than 0.4mm.
With reference to Fig. 3 and Fig. 4, the short muscle material of geo-grid 11a, the long muscle material of geo-grid 11b that described slope reinforcement structure 11 is laid by longitudinal separation in red-bed mudstone packing course 3 constitute.The short muscle material of geo-grid 11a extends internally by roadbed side slope is domatic.Usually, it is 4m that the short muscle material of geo-grid 11a lays width, vertically is spaced apart 0.6m.The long muscle material of geo-grid 11b draws the wide bed to establish in the full section width of roadbed, and the long muscle material of geo-grid 11b lays two-layer at interval, and wherein bottom is not more than 1.0m apart from the distance on roadbed substrate 4 surfaces, and the second layer is 1.8m apart from the distance of bottom.The short muscle material of geo-grid 11a, the long muscle material of geo-grid 11b structure should adopt the low two-way geo-grid of strain high strength, and its ultimate tensile strength is not less than 50KN/m, and the nominal strength elongation per unit length is not more than 10%, mesh size 80~150mm, fabric width 4m.With reference to Fig. 8 and Fig. 9, described slope protection structure 6 is along the mortar flag stone of slope masonry or the concrete skeleton bank protection of burying underground that has rhone 10a.Concrete skeleton is arch form or the chevron shaped skeleton of 6a with drainage channels, turfing in the skeleton, hydraulic pressure sow grass seeds by duster grass planting or mortar flag stone etc.The skeleton buried depth is not less than 0.4m, needs with mortar flag stone or concrete fringing around the bank protection, and toe is provided with gutter 9 outward.
With reference to Fig. 3, described totally-enclosed water proof structure 5 is for covering the asphalt concrete layer on the curb 9.
By road bed, roadbed side slope and roadbed toe draining building, in conjunction with the anti-drainage of substrate, form perfect waterproof and water drainage system, guaranteed that the red-bed mudstone roadbed is not softened by surface water or phreatic infiltration.
The construction method of Redbeds mudstone filled high-speed railway subgrade of the present invention mainly comprises the steps: 1. to handle roadbed substrate 4 and prepares sub-layer, and the basic bearing capacity of roadbed substrate 4 is not less than 200kpa, and embankment completion groundwork settlement after construction is not more than 15mm; 2. prepare the red-bed mudstone filler; 3. placement in layers red-bed mudstone packing course 3, and carry out 11 constructions of slope reinforcement structure; 4. filling roadbed bedding 2; 5. fill track concrete foundation 1; 6. carry out slope protection structure 6 and subgrade and pavement and adopt totally-enclosed water proof structure 5 constructions.
Concrete construction technology and control as follows:
1. base treatment and prepare sub-layer
Substrate should meet following condition: basic bearing capacity is not less than 200kpa, and embankment completion groundwork settlement after construction is not more than 15mm.
Carry out substrate draining, water proof facility according to designing requirement.
The sub-layer surfacing is solid, has the road camber (4% draining horizontal wall inscription) of regulation, without any discrete material and weak place.The planeness and the degree of compaction of sub-layer are up to specification.During base treatment, press the construction of design and construction standard relevant requirements.
2. construction lofting
(1) recover center line on sub-layer, every 10m establishes one, and in both sides curb peripheral hardware indication stake.
(2) carry out horizontal survey, in the indication stake of both sides, tie up the design height that red cloth bar (or white line rope) indicates every layer of edge.
3. get the raw materials ready and mix and stir
A, place are selected:
(1) place should be smooth, and drainage measure is arranged.
(2) sidewalk is unobstructed, is convenient to transport.
(3) should there be the area of economical rationality in the place, adapting to construction period, and is beneficial to and reclaims.
B, native fully:
(1) there are not tree root, turf and assorted soil in the soil.
(2) fetch earth and note pulverizing as far as possible soil block in the process.
C, check filler:
Need in the melting process filler is carried out the basic index check, meet table 1 requirement.
The requirement of table 1 red-bed mudstone basic index
The red-bed mudstone index Requirement
Particle diameter after disintegration or the fragmentation ??<15cm
Maximum compacted dry density ??>2.10g/cm3
Bearing ratio (CBR) value ??≥5
Coefficient of softening ??≥0.4
Expansion rate ??≤0.10%
4. filler transportation
The filler that mixes and stirs will be transported to the making scene as early as possible, and heavy duty dump truck is adopted in the filler transportation, and the filler on the car should cover, to reduce moisture loss.
5. filler paves
When adopting machineries such as bulldozer, land leveller to pave, according to calculating the good per car filler area that paves, the equidistant stacking of filler is in heaps, push away flat with bulldozer 4% horizontal wall inscription in accordance with regulations, with land leveller filler is paved evenly by loose laying depth again, should be behind the land leveller at any time with the levelling of hollow place.The filler paving width should design curb edge extra-fill and be not less than 0.5m.
6. roll
In time roll after the filler leveling with vibratory roller, roll in the middle of curb two side direction and carry out, the wheel seal is answered overlapping 0.4m when rolling, first pass adopts static pressure, rise for second time and change vibroroller cmpacting into, shake to shaking by force, roll and be performed until the degree of compaction that reaches regulation by weak, last is all over using static pressure instead, to eliminate the rut seal.Multiple pressure is answered 2~3 times in curb limit, both sides, and the part that the curb edge is not pressed onto can take oblique advance and retreat method to roll.
The connection of adjacent roadbed can be taked the staggered mode that overlaps of layering, and longitudinal lap joint length is not less than 2m, to guarantee the stability of roadbed.
After rolling, every layer of red-bed mudstone should possess weathering, so that discharge rainwater during rainfall rapidly; After the rainfall, should on the red-bed mudstone roadbed, roll several times.If have ready conditions, can when rainfall, in time the red-bed mudstone roadbed be covered with canvas cloth.
7. lay bed thickness management material
The artificial geo-grid of laying is adopted in roadbed placement in layers and after the assay was approved.
The short muscle material 11a of geo-grid vertically lays on road along the line, and the muscle material is 0.10m apart from the distance of roadbed side slope.The long muscle material of geo-grid 11b lays along cross-sectional direction, and muscle material end is 0.10m apart from the distance of roadbed side slope.Should volume is long consistent with the laying direction during laying.The geo-grid vertical, horizontal connects, and adopts overlap joint and pricks knot with the less nylon rope of elongation per unit length.Lap width is not less than 20cm, pricks the node interlaced arrangement, and spacing generally is not more than 50cm.Require bond strength to be not less than material body intensity.Geo-grid should be strained exceptionally straight, phenomenons such as arch camber, fold must not occur, and is fixed on " U " shape iron nail and fills Tu Mianshang, guarantees must not be moved when banketing.
Should in time fill filler after geo-grid paves, be exposed to the sun for a long time to avoid being subjected to sunlight.Generally speaking, blanking time should be above 48 hours.
As finding that geo-grid has quality problems such as breakage, crackle, should in time repair or do to change and handle before banketing.
The thickness of the layer must not be less than 15cm between construction machinery and the geo-grid, and the first floor filler should adopt light-duty bulldozer or front end loader operation.
Geo-grid should be transported to the scene from storehouse according to the daily requirement amount, unnecessary grid must not be deposited in the sun.
8. brush is sloping
Adopt man-machine cooperation brush slope, excavator brush slope, manual amendment.The brush slope is taken all factors into consideration according to mechanical performance and raising opportunity, but must not surpass the roadbed design shoulder height.Be advisable with raising 4m in general brush for the first time slope, later every raising 3m brush slope once.
Pave at roadbed filling, roll and fill in the process of the test, should test the rolling effect of Different Weight rolling compaction machine, different paving thickness, different number of rolling, to determine reasonable, economic paving thickness, number of rolling.
9. quality examination
Red-bed mudstone filling compaction quality control standards (QCS) should meet the requirement of table 2, in time test data is carried out finishing analysis, notices that each detects the correlation of index.
Table 2 red-bed mudstone filling compaction quality control standards (QCS)
Inspection item Coefficient of consolidation Kh ??K30(MPa/m) ??Ev2(MPa)
Test stone ??≥0.95 ??≥150 ??≥60
Other
Base treatment, bedding are built, side slope protection, laying ballastless track and bituminous concrete waterproofing course are implemented by relevant design, job specfication.

Claims (9)

1. Redbeds mudstone filled high-speed railway subgrade, the cross section of this roadbed is trapezoidal, by go up red-bed mudstone packing course (3), subgrade bed (2), track concrete foundation (1) formation that order is filled in roadbed substrate (4), it is characterized in that: totally-enclosed water proof structure (5) is adopted on the road surface of described roadbed, and roadbed side slope has slope protection structure (6) and reinforced by slope reinforcement structure (11); Be provided with anti-drainage blanket (7) between described roadbed substrate (4) and red-bed mudstone packing course (3) bottom surface.
2. Redbeds mudstone filled high-speed railway subgrade as claimed in claim 1 is characterized in that: between described subgrade bed (2) bottom surface and red-bed mudstone packing course (3) end face herringbone weathering is set, and is equipped with waterproof bed course (8) betwixt.
3. Redbeds mudstone filled high-speed railway subgrade as claimed in claim 2 is characterized in that: described waterproof bed course (8) is made of medium-sand seam (8a) and middle folded one deck composite earthwork rete (8b) thereof.
4. Redbeds mudstone filled high-speed railway subgrade as claimed in claim 1, it is characterized in that: the short muscle material (11a) of geo-grid, the long muscle material of geo-grid (11b) that described slope reinforcement structure (11) is laid by longitudinal separation in red-bed mudstone packing course (3) constitute, wherein the short muscle material of geo-grid (11a) extends internally by roadbed side slope is domatic, and the long muscle material of geo-grid (11b) draws the wide bed to establish in the full section width of roadbed.
5. Redbeds mudstone filled high-speed railway subgrade as claimed in claim 4 is characterized in that: described slope protection structure (6) is along the mortar flag stone of slope masonry or the concrete skeleton bank protection of burying underground that has rhone (6a).
6. Redbeds mudstone filled high-speed railway subgrade as claimed in claim 1 is characterized in that: described anti-drainage blanket (7) is made of sand gravel layer (7a) and middle folded one deck composite earthwork rete (7b) thereof.
7. Redbeds mudstone filled high-speed railway subgrade as claimed in claim 1 is characterized in that: described totally-enclosed water proof structure (5) is for covering the asphalt concrete layer on the curb.
8. the construction method of Redbeds mudstone filled high-speed railway subgrade as claimed in claim 1 comprises the steps:
1. handle roadbed substrate (4) and prepare sub-layer, the basic bearing capacity of roadbed substrate (4) is not less than 200kpa, and embankment completion groundwork settlement after construction is not more than 15mm;
2. prepare the red-bed mudstone filler;
3. placement in layers red-bed mudstone packing course (3), and carry out slope reinforcement structure (11) construction;
4. filling roadbed bedding (2);
5. fill track concrete foundation (1);
6. carry out slope protection structure (6) and subgrade and pavement and adopt totally-enclosed water proof structure (5) construction.
9. the construction method of Redbeds mudstone filled high-speed railway subgrade as claimed in claim 8 is characterized in that: step 2. described in the basic index of red-bed mudstone filler be: the particle diameter<15cm after disintegration or the fragmentation, maximum compacted dry density>2.10g/cm 3, bearing ratio (CBR) value 〉=5, coefficient of softening 〉=0.4, expansion rate 0.10%.
CN200710050182A 2007-09-30 2007-09-30 Redbeds mudstone filled high-speed railway subgrade and construction method thereof CN101153475B (en)

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GB0908280D0 (en) * 2009-05-14 2009-06-24 Geofabrics Ltd Trackbed liner and related methods
CN101974877A (en) * 2010-10-18 2011-02-16 中铁第四勘察设计院集团有限公司 Rapid transit railway soft rock-improved soil roadbed structure
CN101979766B (en) * 2010-10-21 2012-07-11 中铁第四勘察设计院集团有限公司 Subgrade bed structure of high-speed railway red clay cutting
CN102587244A (en) * 2012-01-19 2012-07-18 尚久駜 Stacked geogrid enhanced composite soil roadbed and side slope ecology protection structure thereof
CN102535261A (en) * 2012-03-19 2012-07-04 中铁第四勘察设计院集团有限公司 Railway subgrade structure of seismic area
CN106702823B (en) * 2016-12-21 2019-05-21 中铁二院工程集团有限责任公司 A kind of high-speed railway lattice embankment structure and construction method
CN106758559B (en) * 2017-01-12 2019-01-04 中铁二院工程集团有限责任公司 A kind of construction method of high-speed railway silt, flour sand embankment structure
GB201714867D0 (en) * 2017-09-15 2017-11-01 Tensar Tech Ltd Geoengineering constructions for use in railways

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