CN106676991A - Expansive soil embankment structure improved and reinforced by sandwich method and construction method - Google Patents
Expansive soil embankment structure improved and reinforced by sandwich method and construction method Download PDFInfo
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- CN106676991A CN106676991A CN201710058552.1A CN201710058552A CN106676991A CN 106676991 A CN106676991 A CN 106676991A CN 201710058552 A CN201710058552 A CN 201710058552A CN 106676991 A CN106676991 A CN 106676991A
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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
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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
Abstract
The invention discloses an expansive soil embankment structure improved and reinforced by a sandwich method and a construction method. The structure comprises a subgrade bed surface layer, a subgrade bed bottom layer and a subgrade body in sequence from top to bottom, wherein the subgrade body is composed of an expansive soil filling region and an improved soil filling region which are distributed at interval; anti-running slipping grids are arranged on side slopes at two sides of the subgrade body; transverse water drainage slopes are arranged at the bottoms of the subgrade bed surface layer and the subgrade bed bottom layer, and the bottom of the expansive soil filling region in the subgrade body; an inclined water discharge hole is buried in the transverse water drainage slope of the expansive soil filling region; a reversed filtering layer is arranged at the periphery of the inclined water discharge hole. According to the expansive soil embankment structure disclosed by the invention, a technical problem that expansive soil cannot be used for carrying out embankment filling is solved, and the quality meets the requirements after embankment filling construction of an expansive soil region is carried out; the improvement cost can be greatly reduced, and a flow of a construction process is simplified; large-scale construction and continuous filling are convenient to carry out, and the aims of reasonable technology and reduced cost are realized; the expansive soil embankment structure has a wide popularization and application value.
Description
Technical field
The present invention relates to railway subgrade works field, the Treatment of Expansive Soil Embankment structure reinforced is improved in particular to a kind of sandwich method
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 is developed the most, is 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 tree section expansive soils roadbed length about 155.83km, account for road
The 63.3% of base total length.Swelled ground along the line is widely distributed, desirable without high quality filler in the range of wherein Dengzhou to Xiangyang about 120km,
Unavoidably utilize Expansive Soil Filling, the expansive soil improvement soil side of embankment about 15,810,000.
The highway built in national swelled ground area and railway, roadbed generally produced and squeezed outside sinking, 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 renovating 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.
Under normal circumstances swelled ground is passed through more than the railway construction of region respectively using type of bridge.When by some condition limits
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 is easy to above-mentioned disease carrying out roadbed filling construction if roadbed is all directly constructed using Expansive Soil Filling,
So being carried out being filled after chemical modifying using swelled ground is filling roadbed at present, the selection of modifying agent mostly is Calx 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 adopt special version, and so as to reach the unfavorable characteristic that swelled ground is filled both is eliminated, it is ensured that
Roadbed safety can simplify subgrade construction technique again, increase economic efficiency.
The content of the invention
For the deficiencies in the prior art, it is an object of the invention to provide the Treatment of Expansive Soil Embankment that a kind of improvement of sandwich method is reinforced
Structure and construction method, so that solve cannot construction problem, Expansive Soil Filling moisture content using demi-inflation soil filling roadbed rainy season
Change produces the quality problems such as breathing destruction, and the present invention not only can cause to meet quality using after the filling roadbed construction of swelled ground
Require, can also greatly reduce expansive soil improvement processing cost, reach technology rationally, the purpose of cost, and embankment raising gets over
Greatly, then the economy of the road structure can more be embodied.
For achieving the above object, the Treatment of Expansive Soil Embankment structure that a kind of sandwich method improvement of the invention is reinforced, from top to bottom successively
Including surface layer of subgrade bed, bottom layer of subgrade, roadbed body, it is characterized in that, the both sides of the surface layer of subgrade bed are provided with shoulder protector, institute
The top both sides for stating bottom layer of subgrade are provided with fringing, and the two bottom sides of the roadbed body are provided with lower fringing, the lower edge
The bottom on side is provided with support spats, and the roadbed body fills region by swelled ground and conditioned soil is filled between region is layered up and down
Every distribution composition；Lower leaf in the roadbed body both sides side slope is provided with anti-slippery grid, the 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, and the swelled ground fills the horizontal row in region
Oblique spilled water hole is buried in water slope, around the oblique spilled water hole loaded filter is provided with.
Further, the superiors' swelled ground of the roadbed body is filled and be provided with region anti-deformation reinforcing layer, described
The orlop swelled ground of roadbed body is filled and be provided with region waterproof cushion.Anti-deformation reinforcing layer is arranged on roadbed body
Portion, prevents overall collapse from deforming.Waterproof cushion makes the infiltration that swelled ground fills region be maintained at swelled ground and fill in region to pass through
Oblique spilled water hole is discharged and is not entered lower section conditioned soil and fill region and cause bedding disaster.
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 filling using AB fillers, partition pad is set in the bottom of bottom layer of subgrade
Layer.When filling using conditioned soil in the bottom layer of subgrade, in the top laying swelled ground of roadbed body region is filled；Filled out using AB
When material is filled, in the top laying conditioned soil of roadbed body region is filled.If bottom layer of subgrade fills conditioned soil, roadbed body
Top layer is generally swelled ground, and expense is both economical；If bottom layer of subgrade fills AB group fillers, the top layer of roadbed body should be to change
Good soil prevents Defect of Foundation Bed of Express.
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, the anti-slippery grid is laid by direction earthwork grille level and is formed, and outer ledge is inflection knot
Structure.
Further, the surface layer of subgrade bed, bottom layer of subgrade bottom and roadbed body middle expansive soils fill sections bottom
The slope on the transverse drainage slope of both sides is 4%.
A kind of construction method that the Treatment of Expansive Soil Embankment structure reinforced is improved according to above-mentioned sandwich method, it is characterized in that,
Comprise the 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) concrete 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) 1~3 layer of swelled ground is laid on the waterproof cushion and fills region, and sections bottom two is filled in swelled ground
Oblique spilled water hole is buried in side, then lays 1~2 layer of conditioned soil and fills region；
33) continue filling roadbed body, region is filled using conditioned soil and fills region interval filling construction with swelled ground, such as
This circulation；
34) region is filled in 1~2 layer of laying conditioned soil of the roadbed bodies top；
35) 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 filling 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 guaranteeing earth material must not be strong expansion, can only directly carry out roadbed filling using weak, middle expansive soils；Rainy season
During construction, before rainfall is arrived complete conditioned soil and fill region and to fill reach waterproof effect；When using lime improvement road-mix method
During construction, swelled ground is paved on roadbed filling face, be sprinkled with Calx as dry in the sun place, treat that its moisture content is reduced to suitable model
Road-mix construction is carried out after enclosing.
A kind of sandwich method that the present invention is provided improves the Treatment of Expansive Soil Embankment structure and construction method reinforced, and its core point is
During embankment, after often filling 1~3 layer of swelled ground, 1~2 layer is filled using conditioned soil, such intercycle is filled, and can be solved
Certainly swelled ground rainy season cannot construction problem, it is ensured that it is equal that layer is filled at the continuous construction of roadbed filling, roadbed body bottom portion and top
Filled using conditioned soil.
The Treatment of Expansive Soil Embankment structure and construction method that a kind of sandwich method improvement proposed by the present invention is reinforced has following a few sides
The advantage in face：
(1) present invention is applied to swelled ground area embankment engineering, and compared to conventional swelled ground area high-quality is lacked
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
High economic benefit.
(2) roadbed body is filled using conditioned soil and swelled ground interval, roadbed water proof effect is strengthened, while so that roadbed
Construction is affected to reduce by rainy season, as long as completing to ensure that roadbed filling construction is not received by conditioned soil fills layer before rainfall is arrived
Affect.
(3) compare and all version was 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 version railway embankment,
And do not affected by rainy season, meet extensive construction and continuously fill requirement.
(4) when roadbed filling adopts lime improvement road-mix construction, swelled ground can be sprinkled with Calx and is paved and be filled out in roadbed
Build on face, use as interim dry in the sun place, after swelled ground moisture content is reduced to OK range road-mix construction is carried out,
Expansive Soil Filling lacks dry in the sun 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.
(5) 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 to stablize, and takes these measures effectively to prevent roadbed side slope cracking, slip and collapse.
China's swelled ground is widely distributed, and the present invention overcomes swelled ground not only to be caused with the technology prejudice of embankment
Quality meets and requires after the embankment construction of swelled ground area, and can greatly reduce betterment expense, simplify construction technology process,
Be easy to extensive construction continuously to fill, reach technology rationally, the purpose of cost, with wide application value.
Description of the drawings
Fig. 1 is the structural representation of the first embodiment of the Treatment of Expansive Soil Embankment structure of sandwich method improvement reinforcing of the present invention；
Fig. 2 is the structural representation of second embodiment of Treatment of Expansive Soil Embankment structure that sandwich method improvement of the present invention is reinforced；
Fig. 3 is the structural representation of the third embodiment of the Treatment of Expansive Soil Embankment structure of sandwich method improvement reinforcing of the present invention；
Fig. 4 is the structural representation of the 4th kind of embodiment of Treatment of Expansive Soil Embankment structure that sandwich method improvement of the present invention is reinforced；
Fig. 5 is that slippery grid outside inflection version is prevented in Fig. 1~Fig. 4；
Fig. 6 is oblique spilled water hole thin portion version 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 sandwich method improvement of the present invention is reinforced, one embodiment such as Fig. 1, Fig. 5, Fig. 6 institute
Show, the road bed of Treatment of Expansive Soil Embankment structure is shaped as triangle road camber, include surface layer of subgrade bed 1, bottom layer of subgrade successively from top to bottom
2nd, roadbed body 3.The thickness 0.6m of surface layer of subgrade bed 1, fills A group fillers (except sandy soil).The thickness 1.9m of bottom layer of subgrade 2, fills improvement
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 pad
The composite geo-membrane or capillary drainage plate of one layer of layer middle part folder.Filler of the paving location of waterproof cushion 4 according to bottom layer of subgrade
It 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 lower leaf on region 6 and is spaced apart and constitutes.Roadbed
The orlop swelled ground of body 3 fills and waterproof cushion 4 is also equipped with 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.
Each swelled ground fills the bottom of region 5 and is all provided with by bottom, the roadbed body 3 of surface layer of subgrade bed 1 and bottom layer of subgrade 2
The heart is to the transverse drainage slope that both sides slope is 4%.Swelled ground fills the bottom of region 5 and oblique sluicing is buried in transverse drainage slope
Hole 8.Oblique spilled water hole 8 is managed using pvc, and tube wall need to leave spilled water hole, and in embedment roadbed part loaded filter 11, loaded filter need to be arranged
11 can add sand, outside to be wrapped up using geotextile using rubble or sand gravel.
Roadbed body 3 fills scope domestic demand and carries out reinforcement reinforcement measure, roadbed to side slope of embankment using geosynthetics
Lower leaf in the both sides side slope of body 3 is provided with anti-slippery grid 7, anti-slip at interval of the anti-slippery grid 7 of 0.6m height levels laying
Sliding grid 7 typically adopts two-way one layer of GSZ, width to should be greater than conditioned soil bound edge transverse width, prevents the outside of slippery grid 7
Edge adopts inflection mode, and diffraction length should basis《Railway bed geosynthetics Application Design specification》Calculated.It is anti-
The bidirectional stretch intensity of slippery grid 7 is not less than 25kN/m.Unidirectional GSZ is may also be employed, tensile strength is not less than 25kN/m,
Tensile strength direction should laterally lay along roadbed section.
Second embodiment of the present 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 present invention as shown in figure 3, be with the difference of one embodiment：In bottom layer of subgrade 2
Bottom arranges anti-deformation reinforcing layer 9 near the region of roadbed body 3, and anti-deformation reinforcing layer 9 adopts three-dimensional geogrid, 1~2 layer three
Bottom layer of subgrade 2 is completely spread to GSZ, three-dimensional tensile strength is not less than 110kN/m.
4th embodiment of the present invention as shown in figure 4, be with the difference of second embodiment：In bottom layer of subgrade 2
Bottom arranges anti-deformation reinforcing layer 9 near the region of roadbed body 3, and anti-deformation reinforcing layer 9 typically adopts three-dimensional geogrid, and 1~2
Layer three-dimensional geogrid completely spreads bottom layer of subgrade 2, and three-dimensional tensile strength is not less than 110kN/m.
The construction method of the Treatment of Expansive Soil Embankment structure reinforced is improved based on above-mentioned sandwich method, is comprised the 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 typically improved as modifying agent using cement or Calx to swelled ground.
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, per layer of compacted depth is less 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) 1~3 layer of swelled ground is laid on waterproof cushion 4 and fills region 5, and the two bottom sides of region 5 are filled in swelled ground
The transverse drainage slope that slope is 4% is set, and oblique spilled water hole 8 is buried in weathering, then lay 1~2 layer of conditioned soil
Fill region 6.
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, before rainfall is arrived complete conditioned soil and fill region 6 and to fill reach waterproof effect；When using lime improvement road-mix construction
When, swelled ground is paved on roadbed filling face, Calx is sprinkled with as dry in the sun place, after its moisture content is reduced to OK range
Carry out road-mix construction.
33) 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.
34) 1~2 layer of the top of roadbed body 3, laying conditioned soil fills region 6.
35) side slope of roadbed body 3 carries out reinforcement reinforcement using anti-slippery grid 7 to Treatment of Expansive Soil Embankment side slope, at interval of
The two-way one layer of GSZ of the high layings of 0.6m, the spacing between each layer geosynthetics is not preferably less than each layer and fills layer most
Little thickness, and 1m is not preferably greater than, the width of anti-slippery grid 7 should be greater than conditioned soil bound edge transverse width, prevent the outside of slippery grid 7
Edge adopts inflection mode, and diffraction length should basis《Railway bed geosynthetics Application Design specification》Calculated.It is double
It is not less than 25kN/m to the bidirectional stretch intensity of GSZ.Unidirectional GSZ is may also be employed, 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 near the region of bottom layer of subgrade 2.Anti-deformation reinforcing layer 9 is using three-dimensional geotechnique
Grid, 1~2 layer of 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, per layer of compacted depth is less 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 one layer of composite geo-membrane of folder 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 have high demands, 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, so as to reach in the premise for ensureing roadbed quality
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 sandwich method improvement is reinforced, includes successively from top to bottom surface layer of subgrade bed (1), bottom layer of subgrade
(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 bottom layer of subgrade
(2) top both sides are provided with fringing (13), and the two bottom sides of the roadbed body (3) are provided with lower fringing (14), described
The bottom of lower fringing (14) is provided with support spats (10), and the roadbed body (3) fills region (5) and conditioned soil by swelled ground
Fill lower leaf on region (6) and be spaced apart composition；Lower leaf in the side slope of roadbed body (3) both sides is provided with anti-slippery lattice
Grid (7), it is equal that the surface layer of subgrade bed (1), bottom layer of subgrade (2) bottom and roadbed body (3) middle expansive soils fill region (5) bottom
If transverse drainage slope, the swelled ground is filled and bury in the transverse drainage slope in region (5) oblique spilled water hole (8), described oblique to let out
Loaded filter (11) is provided with around water hole (8).
2. the Treatment of Expansive Soil Embankment structure that sandwich method improvement according to claim 1 is reinforced, it is characterised in that：The roadbed sheet
The superiors' swelled ground of body (3) fills and anti-deformation reinforcing layer (9) is provided with region (5), the orlop of the roadbed body (3)
Swelled ground fills and waterproof cushion (4) is provided with region (5).
3. the Treatment of Expansive Soil Embankment structure that sandwich method improvement according to claim 1 and 2 is reinforced, it is characterised in that：The base
Filled using AB fillers in bed bottom (2) or conditioned soil is filled, when being filled using conditioned soil, at the top of bottom layer of subgrade (2)
Waterproof cushion (4) is set；When filling 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 sandwich method improvement according to claim 3 is reinforced, it is characterised in that：The partition pad
Layer (4) is medium coarse sand bed course, 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.
5. the Treatment of Expansive Soil Embankment structure that the sandwich method improvement according to claims 1 or 2 is reinforced, it is characterised in that：It is described
Prevent that slippery grid (7) is laid by direction earthwork grille level to be formed, outer ledge is inflection structure.
6. the Treatment of Expansive Soil Embankment structure that sandwich method improvement according to claim 3 is reinforced, it is characterised in that：The bedding bottom
When filling using conditioned soil in layer (2), in the top laying swelled ground of roadbed body (3) region (5) is filled；Filled out using AB fillers
When building, in the top laying conditioned soil of roadbed body (3) region (6) is filled.
7. the Treatment of Expansive Soil Embankment structure that sandwich method improvement according to claim 1 is reinforced, it is characterised in that：The bedding table
Layer (1), bottom layer of subgrade (2) bottom and roadbed body (3) middle expansive soils fill the transverse drainage slope of region (5) two bottom sides
Slope is 4%.
8. the Treatment of Expansive Soil Embankment structure that a kind of sandwich method improvement according to any claim in claim 1~7 is reinforced
Construction method, it is characterised in that：Comprise the steps：1) conditioned soil is made；2) foundation bearing capacity is detected；3) placement in layers road
Basic body (3)；4) bottom layer of subgrade (2) is filled；5) surface layer of subgrade bed (1) is filled；Wherein step 3) concrete 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) 1~3 layer of swelled ground is laid on the waterproof cushion (4) and fills region (5), and region (5) bottom is filled in swelled ground
Portion buries both sides oblique spilled water hole (8), then lays 1~2 layer of conditioned soil and fills region (6)；
33) 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；
34) 1~2 layer of the roadbed body (3) top, laying conditioned soil fills region (6)；
35) anti-slippery grid (7) is laid at equal intervals along vertical height in roadbed body (3) both sides side slope.
9. sandwich method according to claim 8 improves the construction method of the Treatment of Expansive Soil Embankment structure reinforced, it is characterised in that：
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) bottom
Laying 0.1m 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 waterproof cushion
(4)；When being filled using conditioned soil, then in the bottom layer of subgrade (2) top laying waterproof cushion (4).
10. sandwich method according to claim 8 improves the construction method of the Treatment of Expansive Soil Embankment structure reinforced, and its feature exists
In：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 earth material
The shallow gesture grade of dilatancy must not be strong expansion, can only directly carry out roadbed filling using weak, middle expansive soils；During rainy season construction,
Conditioned soil is completed before rainfall is arrived and fills region (6) and to fill reach waterproof effect；When using lime improvement road-mix construction
When, swelled ground is paved on roadbed filling face, Calx is sprinkled with as dry in the sun place, after its moisture content is reduced to OK range
Carry out road-mix construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710058552.1A CN106676991A (en) | 2017-01-23 | 2017-01-23 | Expansive soil embankment structure improved and reinforced by sandwich method and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710058552.1A CN106676991A (en) | 2017-01-23 | 2017-01-23 | Expansive soil embankment structure improved and reinforced by sandwich method and construction method |
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| Publication Number | Publication Date |
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| CN106676991A true CN106676991A (en) | 2017-05-17 |
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| CN107881892A (en) * | 2017-12-04 | 2018-04-06 | 祥达建设有限公司 | A kind of town road roadbed construction method |
| CN109235469A (en) * | 2018-10-25 | 2019-01-18 | 北京星河园林景观工程有限公司 | A kind of Cut Slopes of Expansive Soil structure and its construction method |
| CN109281235A (en) * | 2018-11-29 | 2019-01-29 | 西南交通大学 | A kind of volcanic slag railway bed and its process for constructing |
| CN111255477A (en) * | 2020-01-22 | 2020-06-09 | 昆明理工大学 | Lining structure of high backfill tunnel open cut tunnel in high-intensity expansive soil region |
| CN113774742A (en) * | 2021-09-27 | 2021-12-10 | 蓝海建设集团有限公司 | Road bed filling method based on strongly weathered sand-gravel material or waste building material |
| CN114032723A (en) * | 2021-11-26 | 2022-02-11 | 山东大学 | Method for regulating and controlling water content and compact state of roadbed based on weather-resistant hydrogel in operation period |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107881892A (en) * | 2017-12-04 | 2018-04-06 | 祥达建设有限公司 | A kind of town road roadbed construction method |
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| CN109235469A (en) * | 2018-10-25 | 2019-01-18 | 北京星河园林景观工程有限公司 | A kind of Cut Slopes of Expansive Soil structure and its construction method |
| CN109281235A (en) * | 2018-11-29 | 2019-01-29 | 西南交通大学 | A kind of volcanic slag railway bed and its process for constructing |
| CN111255477A (en) * | 2020-01-22 | 2020-06-09 | 昆明理工大学 | Lining structure of high backfill tunnel open cut tunnel in high-intensity expansive soil region |
| CN113774742A (en) * | 2021-09-27 | 2021-12-10 | 蓝海建设集团有限公司 | Road bed filling method based on strongly weathered sand-gravel material or waste building material |
| CN114032723A (en) * | 2021-11-26 | 2022-02-11 | 山东大学 | Method for regulating and controlling water content and compact state of roadbed based on weather-resistant hydrogel in operation period |
| WO2023093468A1 (en) * | 2021-11-26 | 2023-06-01 | 山东交通学院 | Water content and dense state regulation and control method based on weather-resistant hydrogel roadbed operation period |
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Application publication date: 20170517 |