CN106758628A - Treatment of Expansive Soil Embankment structure and construction method that the improvement of compound core-spun method is reinforced - Google Patents
Treatment of Expansive Soil Embankment structure and construction method that the improvement of compound core-spun method is reinforced Download PDFInfo
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- CN106758628A CN106758628A CN201710058987.6A CN201710058987A CN106758628A CN 106758628 A CN106758628 A CN 106758628A CN 201710058987 A CN201710058987 A CN 201710058987A CN 106758628 A CN106758628 A CN 106758628A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention discloses Treatment of Expansive Soil Embankment structure and construction method that a kind of improvement of compound core-spun method is reinforced, the structure includes surface layer of subgrade bed, bottom layer of subgrade, roadbed body successively from top to bottom, and roadbed body fills region by swelled ground and conditioned soil is filled region and is spaced apart and constitutes；Roadbed body both sides side slope is provided with anti-slippery grid, surface layer of subgrade bed, bottom layer of subgrade bottom and roadbed body middle expansive soils fill sections bottom and are all provided with transverse drainage slope, swelled ground is filled buries oblique spilled water hole in the transverse drainage slope in region, loaded filter is provided with around oblique spilled water hole.The present invention overcomes the swelled ground can not to use the technology prejudice of embankment, so that quality meets requirement after the construction of swelled ground area embankment, and betterment expense can be greatly reduced, simplify construction technology process, it is easy to extensive construction continuously to fill, reach technology rationally, the purpose of cost, with wide application value.
Description
Technical field
The present invention relates to railway subgrade works field, in particular to the Treatment of Expansive Soil Embankment that a kind of improvement of compound core-spun method is reinforced
Structure and construction method.
Background technology
Often swelled ground is called disastrous soil to engineering circles, and its key property has：Breathing domestic animal, fissurity, overconsolidation, these three
The complicated collective effect of characteristic causes its engineering properties extreme difference, and usually all kinds of engineering constructions are caused with huge harm, and its
Harm often has multiple, repeatability and long-term potentiality.
China is that swelled ground is distributed one of most wide country, especially in the Changjiang river and the middle and lower reaches of the Yellow River, and southern edge
Sea and southwest, swelled ground are developed the most, are distributed the most universal.As a example by just on newly-built illiteracy Sinorael road, its circuit is three
Door gorge to Jingmen section is divided into cloth swelled ground about 211.3km, and the line is busy, and road is always about 45.5%；Wherein strong swelling soil about 34.8km, in
Deng swelled ground about 109.8km, weak expansive soil about 66.7km.Three chaste trees section expansive soils roadbed length about 155.83km, accounts for road
The 63.3% of base total length.Swelled ground is widely distributed along the line, desirable without high quality filler in the range of wherein Dengzhou to Xiangyang about 120km,
It is inevitable to utilize Expansive Soil Filling, the expansive soil improvement soil side of embankment about 15,810,000.
In highway and railway that national swelled ground area has been built, roadbed generally produces sinking outer crowded, and bedding is risen soil,
Slope erosion slip collapse, the serious plant disease such as slumping and landslide, some landslides not only cause roadbed to destroy in flakes, or even anti-together with roadbed
Shield reinforcing engineering is also damaged together, has a strong impact on traffic safety.Every year because of regulation subgrade in swelling soil zone disease, the investment of cost
More than 500,000,000 yuan, and the newborn disease of various subgrade in swelling soil zone is also constantly occurring.
Swelled ground is passed through more than the railway construction of region using type of bridge respectively under normal circumstances.When by some conditions limit
System, it is necessary to during using roadbed form, it is inevitably weaker using demi-inflation due to the regional allocations of swelled ground
Filler carries out roadbed filling construction, is easy to above-mentioned disease if roadbed is all directly constructed using Expansive Soil Fillings,
So being filled after being carried out chemical modifying using swelled ground is filling roadbed at present, the selection of modifying agent is generally lime or water more
Mud, determines that the volume of modifying agent carries out test section and fills according to laboratory test match ratio, promotes completely using after pass the test, but
Conditioned soil fill exist complicated construction technique, qualified filler yield poorly be not easy to continuously to fill, construction quality it is uppity tired
Difficulty, therefore roadbed design must use special structure type, and the unfavorable characteristic that swelled ground is filled both is eliminated so as to reach, it is ensured that
Roadbed safety can simplify subgrade construction technique again, increase economic efficiency.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide the swelled ground that a kind of improvement of compound core-spun method is reinforced
Embankment structure and construction method, with solve using demi-inflation soil filling roadbed rainy season cannot construction problem, Expansive Soil Filling contain
The change of water rate produces the quality problems such as breathing destruction, of the invention not only to cause to meet using after the filling roadbed construction of swelled ground
Quality requirement, can also greatly reduce expansive soil improvement processing cost, reach technology rationally, the purpose of cost, and embankment fills out
Gao Yue great, then can more embody the economy of the road structure.
To achieve the above object, the Treatment of Expansive Soil Embankment structure that a kind of compound core-spun method improvement of the invention is reinforced, from top to bottom
Include surface layer of subgrade bed, bottom layer of subgrade, roadbed body successively, it is characterized in that, the both sides of the surface layer of subgrade bed are provided with shield
Shoulder, the top both sides of the bottom layer of subgrade are provided with fringing, and the two bottom sides of the roadbed body are provided with lower fringing, described
The bottom of lower fringing is provided with support spats, and the top of the roadbed body, bottom and side slope fill region, middle part for conditioned soil
Region is filled by swelled ground and conditioned soil is filled region and is layered to be spaced apart up and down and constitutes；The roadbed body both sides side slope is upper and lower
Layering is provided with anti-slippery grid, and the surface layer of subgrade bed, bottom layer of subgrade bottom and roadbed body both sides side slope are all provided with horizontal row
Water slope, buries oblique spilled water hole in the transverse drainage slope of the roadbed body, loaded filter is provided with around the oblique spilled water hole.
Further, the top conditioned soil of the roadbed body is provided with anti-deformation reinforcing layer in filling region, described swollen
The bottom that swollen soil fills region is provided with waterproof cushion.Anti-deformation reinforcing layer is arranged at the top of roadbed body, prevents overall mistake
Steady deformation.Waterproof cushion makes the infiltration that swelled ground fills region be maintained at during swelled ground fills region to be discharged by oblique spilled water hole
Cause bedding disaster without filling region into lower section conditioned soil.
Further, filled using AB fillers in the bottom layer of subgrade or conditioned soil is filled, filled using conditioned soil
When, at the top of bottom layer of subgrade, waterproof cushion is set；When being filled using AB fillers, partition pad is set in the bottom of bottom layer of subgrade
Layer.If bottom layer of subgrade fills conditioned soil, the top layer of roadbed body is generally swelled ground, and expense is both economical；If bedding bottom
Layer fills AB group fillers, and the top layer of roadbed body should prevent Defect of Foundation Bed of Express for conditioned soil.
Further, the waterproof cushion is medium coarse sand bed course, and one layer of composite earthwork is pressed from both sides in the middle part of medium coarse sand bed course
Film or capillary drainage plate.
Further, described to prevent that slippery grid is laid by direction earthwork grille level, outer ledge is inflection structure.
Further, the transverse drainage slope of the surface layer of subgrade bed, bottom layer of subgrade bottom and roadbed body both sides side slope
Slope be 4%.
Further, the superiors' swelled ground of the roadbed body is also equipped with anti-deformation reinforcing layer in filling region.
A kind of construction method of the Treatment of Expansive Soil Embankment structure reinforced according to the improvement of above-mentioned sandwich method, it is characterized in that,
Comprise the following steps：1) conditioned soil is made；2) foundation bearing capacity is detected；3) placement in layers roadbed body；4) bottom layer of subgrade is filled；
5) surface layer of subgrade bed is filled；Wherein step 3) specific steps include：
31) 1~2 layer of laying conditioned soil of roadbed body bottom portion is filled into region, one layer of waterproof cushion is laid on top；
32) all filled using conditioned soil near the both sides of side slope, 1~3 layer of swelled ground is laid on the waterproof cushion
Region is filled, basic body of satisfying the need both sides conditioned soil, centre swelled ground separately pave, unification is rolled；
33) region two bottom sides are filled in swelled ground and buries oblique spilled water hole, then lay 1~2 layer of conditioned soil reclamation district
Domain；
34) continue filling roadbed body, region is filled using conditioned soil and fills region interval filling construction with swelled ground, such as
This circulation；
35) region is filled in 1~2 layer of laying conditioned soil of the roadbed bodies top；
36) anti-slippery grid is laid at equal intervals along vertical height in roadbed body both sides side slope.
Preferably, the step 4) filled using AB fillers or conditioned soil is filled, when being filled using AB fillers, described
Bottom layer of subgrade bottom laying 0.1m thick medium coarse sand bed course, and one layer of composite geo-membrane, shape are pressed from both sides in the middle part of the medium coarse sand bed course
Into waterproof cushion；When being filled using conditioned soil, then waterproof cushion is laid at the top of the bottom layer of subgrade.
Preferably, when filling swelled ground and fill region, the swellability index of earth material need to be chemically examined by the batch of regulation,
The shallow gesture grade of dilatancy for ensuring earth material must not be strong expansion, can only directly carry out roadbed filling using weak, middle expansive soils；Rainy season
During construction, completion conditioned soil is filled region and is filled and reaches waterproof effect before rainfall arriving；When using lime improvement road-mix method
During construction, swelled ground is paved on roadbed filling face, be sprinkled with lime as place is dried, treat that its moisture content is reduced to suitable model
Road-mix construction is carried out after enclosing.
Treatment of Expansive Soil Embankment structure and construction method that a kind of compound core-spun method improvement that the present invention is provided is reinforced, its core point
It is that its core point is that roadbed body both sides, top surface and bottom are processed using water proof filler, inside is direct using swelled ground
The structure type filled.External environment can be prevented to internal Expansive Soil Filling moisture content using water proof filler treatment roadbed both sides
Influence, prevents it from producing swell-shrinking deformation and cracking, it is ensured that roadbed quality, while the usage amount of conditioned soil is greatly decreased, improves
Efficiency of construction and economic benefit.
The Treatment of Expansive Soil Embankment structure and construction method that a kind of compound core-spun method improvement proposed by the present invention is reinforced have following
The advantage of several respects：
(1) present invention is applied to swelled ground area embankment engineering, and high-quality is lacked compared to conventional swelled ground area
All using conditioned soil come the design form of railway embankment in the case of filler, can using described embankment structure form railway embankment
Greatly reduce quantity, modifying agent material cost, working procedure and the engineering time of conditioned soil, so as to reduce engineering cost, carry
Economic benefit high.
(2) conditioned soil is filled using side slope position, the preferable water stability of conditioned soil filler is prevented effectively from usual swelled ground
The issuable side slope of roadbed is slipped and collapses, improves its erosion resistance.Conditioned soil fills region by embankment internal expansion soil reclamation district
Domain separates with external environment, influence of the moisture completely cut off in air to Expansive Soil Filling, makes its moisture content kept stable,
The intensity and stabilization of Expansive Soil Filling are ensure that, the safe mass requirement of roadbed is met.
(3) roadbed body middle part is filled using conditioned soil and swelled ground interval, further enhances roadbed water proof effect, together
When cause subgrade construction by rainy season influenceed reduce, as long as rainfall arriving before complete conditioned soil fill layer by ensure that roadbed is filled out
Build construction unaffected.
(4) compare and structure type was all filled using conditioned soil in the past, due to conditioned soil filling construction complex procedures, work efficiency
Slowly, it is unfavorable for that extensive construction is continuously filled, conditioned soil usage amount can be greatly reduced using the structure type railway embankment,
And do not influenceed by rainy season, meet extensive construction and continuously fill requirement.
(5) when roadbed filling uses lime improvement road-mix construction, swelled ground can be sprinkled with lime and is paved and filled out in roadbed
Build on face, used as the interim place that dries, road-mix construction is carried out after swelled ground moisture content is reduced to OK range,
Expansive Soil Filling lacks drying place when can solve the problems, such as continuously to fill on a large scale to a certain extent, it is ensured that the company of construction
Continuous property.
(6) roadbed bodies top using three-dimensional geogrid draw the wide bed set, and swelled ground fill a layer bottom bury it is oblique
Spilled water hole, keeps roadbed inner stuffing moisture content stabilization, takes these measures effectively to prevent roadbed side slope from ftractureing, slipping and collapse.
China's swelled ground is widely distributed, the technology prejudice for overcoming swelled ground to use embankment of the invention, not only causes
Quality meets and requires after the embankment construction of swelled ground area, and can greatly reduce betterment expense, simplify construction technology process,
It is easy to extensive construction continuously to fill, reaches that technology is reasonable, the purpose of cost, with wide application value.
Brief description of the drawings
Fig. 1 is the structural representation of the first implementation method of the Treatment of Expansive Soil Embankment structure of compound core-spun method improvement reinforcing of the present invention
Figure；
Fig. 2 is the structural representation of second implementation method of Treatment of Expansive Soil Embankment structure that compound core-spun method improvement of the present invention is reinforced
Figure；
Fig. 3 is the structural representation of the third implementation method of the Treatment of Expansive Soil Embankment structure of compound core-spun method improvement reinforcing of the present invention
Figure；
Fig. 4 is the 4th kind of structural representation of implementation method of Treatment of Expansive Soil Embankment structure that compound core-spun method improvement of the present invention is reinforced
Figure；
Fig. 5 is anti-slippery grid outside inflection structure type in Fig. 1~Fig. 4；
Fig. 6 is oblique spilled water hole thin portion structure type in Fig. 1~Fig. 4.
In figure：Surface layer of subgrade bed 1, bottom layer of subgrade 2, roadbed body 3, waterproof cushion 4, swelled ground fills region 5, and conditioned soil is filled out
Region 6 is built, slippery grid 7 is prevented, oblique spilled water hole 8, anti-deformation reinforcing layer 9 supports spats 10, loaded filter 11, shoulder protector 12, upper edge
Side 13, lower fringing 14.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The Treatment of Expansive Soil Embankment structure that a kind of compound core-spun method improvement of the present invention is reinforced, one embodiment such as Fig. 1, Fig. 5, figure
Shown in 6, the road bed of Treatment of Expansive Soil Embankment structure is shaped as triangle road camber, includes surface layer of subgrade bed 1, bedding bottom successively from top to bottom
Layer 2, roadbed body 3.The thickness 0.6m of surface layer of subgrade bed 1, fills A groups filler (except sandy soil).The thickness 1.9m of bottom layer of subgrade 2, fills and changes
Good soil.The top of bottom layer of subgrade 2 is provided with waterproof cushion 4.Waterproof cushion 4 is the thick medium coarse sand bed courses of 0.1m, and in medium coarse sand
The composite geo-membrane or capillary drainage plate of one layer of bed course middle part folder.The paving location of waterproof cushion 4 is filled out according to bottom layer of subgrade
Material is different otherwise varied.
The both sides of surface layer of subgrade bed 1 are provided with shoulder protector 12, and the top both sides of bottom layer of subgrade 2 are provided with fringing 13, roadbed sheet
The two bottom sides of body 3 are provided with lower fringing 14, and the bottom of lower fringing 14 is provided with support spats 10.
Roadbed body 3 fills region 5 by swelled ground and conditioned soil is filled region 6 and constituted.The top of roadbed body 3, bottom
With side slope for conditioned soil fills region 6, middle part fills region 5 by swelled ground and conditioned soil fills lower leaf interval point on region 6
Cloth is constituted.Orlop swelled ground is also equipped with waterproof cushion 4 in filling region 5.Waterproof cushion 4 is the thick medium coarse sand pads of 0.1m
Layer, and one layer of composite geo-membrane or capillary drainage plate are pressed from both sides in the middle part of medium coarse sand bed course.
The both sides side slope of bottom and roadbed body 3 of surface layer of subgrade bed 1 and bottom layer of subgrade 2 is all provided with transverse drainage slope, is all provided with inclining
Slope is 4% transverse drainage slope.Oblique spilled water hole 8 is buried in transverse drainage slope in roadbed body 3.Oblique spilled water hole 8 is adopted
Managed with pvc, tube wall need to leave spilled water hole, loaded filter 11 need to be set in embedment roadbed part, loaded filter 11 can use rubble or sand
Gravel adds sand, and outside is wrapped up using geotextile.
The anti-slippery grid 7 that the both sides side slope of roadbed body 3 is provided with upper and lower layered arrangement carries out reinforcement with to side slope of embankment
Reinforcement measure, at interval of the anti-slippery grid 7 of 0.6m height levels laying, prevents slippery grid 7 typically using two-way one layer geotechnological lattice
Grid, width should be greater than conditioned soil bound edge transverse width, prevent that the outer ledge of slippery grid 7 uses inflection mode, diffraction length to answer root
According to《Railway bed geosynthetics application design specification》Calculated.The anti-bidirectional stretch intensity of slippery grid 7 is not less than
25kN/m.Also unidirectional GSZ can be used, tensile strength is not less than 25kN/m, and tensile strength direction should be along roadbed section transverse direction
Laying.
Second embodiment of the invention as shown in Fig. 2 be with the difference of one embodiment：Bottom layer of subgrade 2 is filled
AB fillers, waterproof cushion 4 is arranged between the bottom of subfoundation 2, subfoundation 2 and roadbed body 3.
3rd embodiment of the invention as shown in figure 3, be with the difference of one embodiment：In roadbed body 3
Top conditioned soil sets anti-deformation reinforcing layer 9 in filling region 6, is also set in the superiors' bentonite of roadbed body 3 fills region 5
Put anti-deformation reinforcing layer 9.Anti-deformation reinforcing layer 9 uses three-dimensional geogrid, 1~2 layer of three-dimensional geogrid completely to spread bottom layer of subgrade
2, three-dimensional tensile strength is not less than 110kN/m.
4th embodiment of the invention as shown in figure 4, be with the difference of second embodiment：In roadbed body 3
Top conditioned soil sets anti-deformation reinforcing layer 9 in filling region 6, is also set in the superiors' bentonite of roadbed body 3 fills region 5
Put anti-deformation reinforcing layer 9.Anti-deformation reinforcing layer 9 typically uses three-dimensional geogrid, 1~2 layer of three-dimensional geogrid completely to spread bedding
Bottom 2, three-dimensional tensile strength is not less than 110kN/m.
The construction method of the Treatment of Expansive Soil Embankment structure reinforced based on the improvement of above-mentioned compound core-spun method, is comprised the following steps：
1) conditioned soil is made.With reference to the regional concrete condition of construction, by laboratory test determine conditioned soil evolutionary approach and
Match ratio is general that swelled ground is improved as modifying agent using cement or lime.
2) foundation bearing capacity is detected.The location inadequate to bearing capacity carries out stiffening basic ground.
3) placement in layers roadbed body, when roadbed body 3 is filled, every layer of compacted depth is no more than 30cm.
31) 1~2 layer of 3 bottom of roadbed body laying conditioned soil is filled into region 6, one layer of 0.1m thickness medium coarse sand is laid on top
One layer of composite geo-membrane of folder in the middle of bed course, bed course, forms waterproof cushion 4.
32) all filled using conditioned soil near the both sides of side slope, 1~3 layer of swelled ground is laid on waterproof cushion 4 and is filled
Region 5, the both sides conditioned soil of basic body of satisfying the need 3, centre swelled ground are separately paved, and unification is rolled.
When filling conditioned soil region 6, side slope position has carried out water proof treatment, and processing method can gather materials on the spot, using swollen
Swollen land reform is good, or uses other water-resisting property fillers, and usual swelled ground is prevented effectively from using the preferable water stability of water-resisting property filler
The issuable side slope of roadbed is slipped and collapses, improves its erosion resistance.After taking water proof to process, embankment internal expansion soil and extraneous ring
Border separates, influence of the moisture completely cut off in air to Expansive Soil Filling, makes its moisture content kept stable, it is ensured that expansion
The intensity and stabilization of native filler, meet the safe mass requirement of roadbed.
When filling swelled ground and filling region 5, the swellability index of earth material need to be chemically examined by the batch of regulation, it is ensured that soil
The shallow gesture grade of dilatancy of material must not be strong expansion, can only directly carry out roadbed filling using weak, middle expansive soils；Rainy season construction
When, completion conditioned soil is filled region 6 and is filled and reaches waterproof effect before rainfall arriving；When using lime improvement road-mix construction
When, swelled ground is paved on roadbed filling face, lime is sprinkled with as place is dried, after its moisture content is reduced to OK range
Carry out road-mix construction.
The conditioned soil that swelled ground fills the both sides of region 5 fills the conditioned soil bound edge width in region 6 according to equation below calculating
Dmax=dmax/λ
In formula, L-bound edge width；Dmax- conditioned soil air dramatic impact depth；M-slope gradient；dmax- swelled ground
Air dramatic impact depth；Swelled ground atmospheric effect reduction coefficient, typically takes 3~4 after λ-improvement.
33) two bottom sides of region 5 are filled in swelled ground and the transverse drainage slope that slope is 4% is set, and in weathering
Embedded oblique spilled water hole 8, then 1~2 layer of the top of roadbed body 3, laying conditioned soil fills region 6.
34) continue filling roadbed body (3), region (6) is filled using conditioned soil fill region (5) with swelled ground and be spaced and fill out
Construction is built, so circulation.
35) 1~2 layer of the top of roadbed body 3, laying conditioned soil fills region 6.
36) the both sides side slope of roadbed body 3 carries out reinforcement reinforcement using anti-slippery grid 7 to Treatment of Expansive Soil Embankment side slope, often
The interval 0.6m two-way one layer of GSZ of laying high, the spacing between each layer geosynthetics is not preferably less than each layer and fills layer
Minimum thickness, and be not preferably greater than 1m, the width of anti-slippery grid 7 should be greater than conditioned soil bound edge transverse width, prevent slippery grid 7
Outer ledge uses inflection mode, and diffraction length should basis《Railway bed geosynthetics application design specification》Counted
Calculate.The bidirectional stretch intensity of direction earthwork grille is not less than 25kN/m.Also unidirectional GSZ can be used, tensile strength is not less than
25kN/m, tensile strength direction should laterally lay along roadbed section.
36) 1~2 layer of anti-deformation reinforcing layer 9 is completely spread in the superiors' swelled ground of roadbed body 3 fills region 5, and in roadbed
The middle berth of 3 top conditioned soil region of body 6 is set up defences and deforms reinforcing layer 9.Anti-deformation reinforcing layer 9 uses three-dimensional geogrid, 1~2 layer
Three-dimensional geogrid completely spreads bottom layer of subgrade 2, and three-dimensional tensile strength is not less than 110kN/m.
4) placement in layers bottom layer of subgrade 2, when bottom layer of subgrade 2 is filled, every layer of compacted depth is no more than 30cm.If bedding bottom
Layer 2 is filled using the AB group fillers of non-conditioned soil, then in the medium coarse sand bed course that the bottom laying 0.1m of bottom layer of subgrade 2 is thick, bed course
Middle part presss from both sides one layer of composite geo-membrane and forms waterproof cushion 4；If bottom layer of subgrade 2 is filled using conditioned soil, at the top of bottom layer of subgrade 2
Laying waterproof cushion 4.
5) surface layer of subgrade bed 1 is filled.
Because conditioned soil complicated construction technique, construction quality requirement are high, can be greatly decreased using above-mentioned road structure form
The usage amount of conditioned soil in work progress, is easy to extensive construction continuously to fill, and the premise of roadbed quality is being ensured so as to reach
The purpose of the lower construction efficiency for improving roadbed filling.Above-mentioned road structure is applied to road of the swelled ground area raising more than more than 3m
Dike fills location, and embankment raising is bigger, then can more embody the economy of the road structure.
Other unspecified parts are prior art.
Claims (10)
1. the Treatment of Expansive Soil Embankment structure that a kind of compound core-spun method improvement is reinforced, includes surface layer of subgrade bed (1), bedding successively from top to bottom
Bottom (2), roadbed body (3), it is characterised in that：The both sides of the surface layer of subgrade bed (1) are provided with shoulder protector (12), the bedding bottom
The top both sides of layer (2) are provided with fringing (13), and the two bottom sides of the roadbed body (3) are provided with lower fringing (14), institute
The bottom for stating lower fringing (14) is provided with support spats (10), and the top of the roadbed body (3), bottom and side slope are conditioned soil
Fill region (6), region (5) is filled in middle part by swelled ground and conditioned soil is filled lower leaf on region (6) and is spaced apart and constitutes；Institute
State lower leaf in the side slope of roadbed body (3) both sides and be provided with anti-slippery grid (7), the surface layer of subgrade bed (1), bottom layer of subgrade (2)
Bottom and roadbed body (3) both sides side slope are all provided with transverse drainage slope, are buried in the transverse drainage slope of the roadbed body (3) oblique
To spilled water hole (8), loaded filter (11) is provided with around the oblique spilled water hole (8).
2. the Treatment of Expansive Soil Embankment structure that compound core-spun method improvement according to claim 1 is reinforced, it is characterised in that：The road
The top conditioned soil of basic body (3) is filled and be provided with region (6) anti-deformation reinforcing layer (9), the roadbed body (3) most under
Layer swelled ground is provided with waterproof cushion (4) in filling region (5).
3. the Treatment of Expansive Soil Embankment structure that compound core-spun method improvement according to claim 1 and 2 is reinforced, it is characterised in that：Institute
To state in bottom layer of subgrade (2) and filled using AB fillers or conditioned soil is filled, when being filled using conditioned soil, in bottom layer of subgrade (2)
Top sets waterproof cushion (4)；When being filled using AB fillers, waterproof cushion (4) is set in the bottom of bottom layer of subgrade (2).
4. the Treatment of Expansive Soil Embankment structure that compound core-spun method improvement according to claim 3 is reinforced, it is characterised in that：It is described every
Water subfill (4) is medium coarse sand bed course, and one layer of composite geo-membrane is pressed from both sides in the middle part of medium coarse sand bed course.
5. the Treatment of Expansive Soil Embankment structure that the compound core-spun method improvement according to claims 1 or 2 is reinforced, it is characterised in that：
Described to prevent that slippery grid (7) is laid by direction earthwork grille level, outer ledge is inflection structure.
6. the Treatment of Expansive Soil Embankment structure that compound core-spun method improvement according to claim 1 is reinforced, it is characterised in that：The base
The slope on the transverse drainage slope of bed top layer (1), bottom layer of subgrade (2) bottom and roadbed body (3) both sides side slope is 4%.
7. the Treatment of Expansive Soil Embankment structure that compound core-spun method improvement according to claim 2 is reinforced, it is characterised in that：The road
The superiors' swelled ground of basic body (3) is also equipped with anti-deformation reinforcing layer (9) in filling region (5).
8. the Treatment of Expansive Soil Embankment that a kind of compound core-spun method improvement according to any claim in claim 1~7 is reinforced
The construction method of structure, it is characterised in that：Comprise the following steps：1) conditioned soil is made；2) foundation bearing capacity is detected；3) layering is filled out
Basic body of building the road (3)；4) bottom layer of subgrade (2) is filled；5) surface layer of subgrade bed (1) is filled；Wherein step 3) specific steps include：
31) 1~2 layer of roadbed body (3) bottom laying conditioned soil is filled into region (6), one layer of waterproof cushion (4) is laid on top；
32) all filled using conditioned soil near the both sides of side slope, 1~3 layer of swelled ground is laid on the waterproof cushion (4) and is filled out
Region (5) is built, basic body of satisfying the need (3) both sides conditioned soil, centre swelled ground separately pave, unification is rolled；
33) region (5) two bottom sides are filled in swelled ground and buries oblique spilled water hole (8), then laid 1~2 layer of conditioned soil and fill
Region (6)；
34) continue filling roadbed body (3), region (6) is filled using conditioned soil fill region (5) with swelled ground and be spaced to fill and apply
Work, so circulation；
35) 1~2 layer of the roadbed body (3) top, laying conditioned soil fills region (6)；
36) anti-slippery grid (7) is laid at equal intervals along vertical height in roadbed body (3) both sides side slope.
9. compound core-spun method according to claim 8 improves the construction method of the Treatment of Expansive Soil Embankment structure reinforced, its feature
It is：The step 4) filled using AB fillers or conditioned soil is filled, when being filled using AB fillers, in the bottom layer of subgrade
(2) laying 0.1m in bottom thick medium coarse sand bed course, and one layer of composite geo-membrane is pressed from both sides in the middle part of the medium coarse sand bed course, form water proof
Bed course (4)；When being filled using conditioned soil, then in the bottom layer of subgrade (2) top laying waterproof cushion (4).
10. compound core-spun method according to claim 8 improves the construction method of the Treatment of Expansive Soil Embankment structure reinforced, its feature
It is：When filling swelled ground and filling region (5), the swellability index of earth material need to be chemically examined by the batch of regulation, it is ensured that soil
The shallow gesture grade of dilatancy of material must not be strong expansion, can only directly carry out roadbed filling using weak, middle expansive soils；Rainy season construction
When, completion conditioned soil is filled region (6) and is filled and reaches waterproof effect before rainfall arriving；Applied when using lime improvement road-mix method
In man-hour, swelled ground is paved on roadbed filling face, be sprinkled with lime as place is dried, treat that its moisture content is reduced to OK range
After carry out road-mix construction.
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