CN107805987A - The hassock layer Foam lightweight soil road structure and construction method in deep soft foundation section - Google Patents

The hassock layer Foam lightweight soil road structure and construction method in deep soft foundation section Download PDF

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Publication number
CN107805987A
CN107805987A CN201710826281.XA CN201710826281A CN107805987A CN 107805987 A CN107805987 A CN 107805987A CN 201710826281 A CN201710826281 A CN 201710826281A CN 107805987 A CN107805987 A CN 107805987A
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CN
China
Prior art keywords
layer
light
hassock
weight foamed
deep soft
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Pending
Application number
CN201710826281.XA
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Chinese (zh)
Inventor
李永良
杨平
李美霞
尹利华
张留俊
刘耀富
杨德广
黄亚飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Pearl River Delta Investment Development Co Ltd
CCCC First Highway Consultants Co Ltd
Third Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
Original Assignee
China Railway Pearl River Delta Investment Development Co Ltd
CCCC First Highway Consultants Co Ltd
Third Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
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Publication date
Application filed by China Railway Pearl River Delta Investment Development Co Ltd, CCCC First Highway Consultants Co Ltd, Third Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC filed Critical China Railway Pearl River Delta Investment Development Co Ltd
Priority to CN201710826281.XA priority Critical patent/CN107805987A/en
Publication of CN107805987A publication Critical patent/CN107805987A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • E01C3/04Foundations produced by soil stabilisation
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12Consolidating by placing solidifying or pore-filling substances in the soil

Abstract

It is construction method the present invention relates to the hassock layer Foam lightweight soil road structure in deep soft foundation section, it is bottom-up including hassock layer, light-weight foamed earth roadbed and supercrust;Hassock layer is along road longitudinal direction making on deep soft soil foundation;Light-weight foamed earth roadbed placement layer by layer on hassock layer, every two layers of placement layer by layer it is light-weight foamed it is earth roadbed between be provided with galvanized wire mesh;Light-weight foamed earth roadbed top surface is provided with supercrust;Movement joint is provided with along light-weight foamed earth roadbed longitudinal direction;Plant native bound edge and form protective layer in light-weight foamed earth roadbed both sides.The present invention have the characteristics that adaptation differential settlement ability it is strong, it is easy for construction, reduce investment outlay, for deep soft soil foundation, particularly broad way base significant effect, successfully solve the excessive technical barrier of deep soft foundation section settlement of subgrade.

Description

The hassock layer Foam lightweight soil road structure and construction method in deep soft foundation section
Technical field
The present invention relates to road engineering technical field, and in particular to a kind of hassock layer Foam lightweight soil in deep soft foundation section Road structure and construction method.
Background technology
Weak soil has the characteristics that high-compressibility, macrovoid ratio, and destabilization of roadbed occurs for the road Louis built on soft soil foundation And the problems such as differential settlement.Therefore, Soft Ground turns into the problem in road project.Solves the way of this problem Footpath has two kinds, and a kind of is the differential settlement for reducing ground, and another kind is adaptation of the enhancing structure thing to uneven settlement of foundation Property.
Foam lightweight soil is that foam and cement mortar are uniformly mixed into fluid, and one kind of final coagulation forming contains The artificial light-duty filling material of a large amount of sealed porositys.Foam lightweight soil can mitigate permanent lotus suffered by ground instead of Stone Filled Embankment of banketing Carry, reduce uneven settlement of foundation, be widely used in traffic civil engineering field.But Foam lightweight soil is rigidity Larger fragile material, brittle break easily occurs when larger uniform settlement occurs for ground, reduces the traffic capacity of road, prestige Coerce traffic safety.
The content of the invention
It is an object of the invention to provide the hassock layer Foam lightweight soil road structure and construction party in a kind of deep soft foundation section Method, solves uneven subsidence when broad width road crosses over deep soft foundation.
The technical solution adopted in the present invention is:
The hassock layer Foam lightweight soil road structure in deep soft foundation section, it is characterised in that:
It is bottom-up including hassock layer is light-weight foamed earth roadbed and supercrust;
Hassock layer is along road longitudinal direction making on deep soft soil foundation;
Light-weight foamed earth roadbed placement layer by layer on hassock layer, every two layers of placement layer by layer it is light-weight foamed it is earth roadbed between be provided with Galvanized wire mesh;Light-weight foamed earth roadbed top surface is provided with supercrust.
Movement joint is provided with along light-weight foamed earth roadbed longitudinal direction.
Plant native bound edge and form protective layer in light-weight foamed earth roadbed both sides.
Hassock layer making is on deep soft soil foundation, thickness range 0.5m ~ 1.2m.
For light-weight foamed earth roadbed placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, using step slope, i.e., The width of after-pouring layer is less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5.
Light-weight foamed earth roadbed every 10m ~ 20m one of movement joint of setting, the width of movement joint is 1cm ~ 2cm.
Native bound edge is planted in roadbed both sides, and the thickness for planting soil is not less than 1m.
The construction method of the hassock layer Foam lightweight soil road structure in deep soft foundation section, it is characterised in that:
Comprise the following steps:
Step 1:Cleaning leveling construction site, presses design requirement making hassock layer after the acceptance(check) of base;
Step 2:Lateral baffle plate and segmentation template are installed, it is completely light-weight foamed earth roadbed using segmentation, comprehensively subregion, layering Cast;For light-weight foamed earth roadbed placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, using step slope, i.e., The width of after-pouring layer is less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5;Longitudinal section length 10m ~ 20m, use false form between longitudinally adjacent cast section, laying 1~2cm thickness plastic foamboards after plate;Strength of mould stripping to be achieved It is to remove false form, leaves plastic foamboard and ensure vertical as movement joint, movement joint;Often poured one layer it is light-weight foamed Soil one layer of galvanized wire mesh of laying, galvanized wire mesh net disconnects in deformation joint, in the light-weight foamed concrete that last layer pours Next layer is poured before initial set;
Step 3:After light-weight foamed concrete reaches design strength and acceptance(check), plant native bound edge and form protective layer, plant soil Thickness is not less than 1m;
Step 4:Carry out supercrust and the construction of other affiliated facilities.
The present invention has advantages below:
The present invention earth roadbed force-mechanism light-weight foamed from soft soil foundation is started with, there is provided one kind is used for deep soft foundation section Hassock layer Foam lightweight soil new-type embankment structure, there is advantages below:
(1) light-weight foamed earth roadbed " bridge formation " effect in Deep Thick Soft Ground is proposed, it is indicated that brittle break easily occurs for roadbed Root, drawn the relation curve of cushion thickness and roadbed bottom tension.
(2) new-type embankment structure of the invention improves the comfortableness and service level of road travel, reduces operation maintenance Cost.The stress concentration of ground is alleviated using hassock layer, have adjusted the differential settlement amount of roadbed, reduces road structure Tension and shear stress;Wire netting between Foam lightweight soil has coordinated the deflection of road structure each several part, makes uniform force; One of movement joint is set every 10m ~ 20m, it is allowed to which fraction of convergent-divergent and differential settlement occur for way of concrete foundations.
(3) new-type embankment structure construction of the invention is quality controllable.Light-weight foamed way of concrete foundations belongs to large volume coagulation Soil application work, the heat of hydration of concrete can be reduced using placement layer by layer, prevents thermal cracking.
(4) easy for construction, the saving time, reduce investment outlay.Deep gas reservoir need not be carried out so that construction can be quick Promote, hassock layer can use the materials such as gravelly soil, gravel, slag, convenient material drawing, low cost.
(5) product is environmentally friendly, attractive in appearance.Using native bound edge is planted, not only with landscape but also roadbed material can be protected.
Brief description of the drawings
Fig. 1 is the bridging action of dual extension-compression modulus roadbed.
Fig. 2 is Foam lightweight soil bottom tension and cushion thickness relation curve
Fig. 3 is the schematic cross-sectional view of this new-type embankment structure.
Fig. 4 is the schematic longitudinal section of this new-type embankment structure.
In figure, 1- hassock layers, 2- is light-weight foamed earth roadbed, 3- galvanized wire mesh, 4- movement joints, 5- protective layers.
Embodiment
With reference to embodiment, the present invention will be described in detail.
Establish the simplified light-weight foamed way of concrete foundations structural finite element model FEM model of deep soft foundation.Pass through change The ratio of rigidity of ground and embankment, obtain subgrade reaction distribution curve.Referring to the drawings 1, Modulus of Subgrade is 0.5 times of ground basic mode During amount, subgrade reaction is basin shape, substantially identical with upper pressure distribution shape, is that the subgrade reaction of typical flexible foundation is special Sign;Subgrade reaction is the shape of a saddle when Modulus of Subgrade is 50 times of ground;Modulus of Subgrade is 250 times or 1000 of ground Times when, middle subgrade reaction very little, and both sides subgrade reaction is very big, there is obvious bridging action, this will cause roadbed material Brittle break.Light-weight foamed earth roadbed modular ratio weak soil is high 100 to 1000 times, therefore can be considered rigid foundation substantially, builds bridge Effect will seriously damage Foam lightweight soil road structure.
Using Foam lightweight soil+bed course processing deep soft foundation, change cushion thickness and choose(0.5m, 1m, 1.5m, 2m, 3m and 4m), while simulation takes the ground of different modulus of elasticity(3MPa, 5MPa, 10MPa, 20MPa and 40MPa), obtained different pads Light soil embankment bottom tension and the relation of uneven settlement of foundation under thickness degree, referring to the drawings 2.Research finds ground inequality Even sedimentation is bigger, and light soil bottom tension is bigger;When formed objects differential settlement occurs for ground, cushion thickness is bigger, gently Matter dirt road basal part tension is smaller.
As can be seen here, bed course can weaken bridging action, weaken influence of the uneven settlement of foundation to road structure, bed course Influence of the thicker ground to roadbed is smaller.In order to avoid increasing the increase that settlement of foundation is caused while the thickness of bed course, this hair The bright cushion thickness scope used is 0.5m ~ 1.2m.
Referring to the drawings 3, accompanying drawing 4, the present invention proposes the hassock layer Foam lightweight soil road structure in deep soft foundation section, under Upwards including hassock layer 1, light-weight foamed earth roadbed 2 and supercrust.Hassock layer 1 along road longitudinal direction making in deep soft soil foundation it On;Light-weight foamed earth roadbed 2 placement layer by layer on hassock layer 1, every two layers of placement layer by layer light-weight foamed earth roadbed 2 between set There is galvanized wire mesh 3;Light-weight foamed earth roadbed top surface is provided with supercrust.
Movement joint 4 is provided with along light-weight foamed earth roadbed 2 longitudinal direction.Plant native bound edge and form protection in light-weight foamed earth roadbed 2 both sides Layer 5.
The making of hassock layer 1 is on deep soft soil foundation, thickness range 0.5m ~ 1.2m.Light-weight foamed earth roadbed 2 placement layer by layer In on hassock layer, every layer of thickness poured is 0.5m, and using step slope, i.e. the width of after-pouring layer is less than the width of preceding layer Degree, both sides step slope ratio of slope are not less than 1:1.5.It is light-weight foamed earth roadbed every 10m ~ 20m one of movement joint 4 of setting, deformation The width of seam is 1cm ~ 2cm.Native 5 bound edges are planted in roadbed both sides, and the thickness for planting soil is not less than 1m.
In Deep Thick Soft Ground it is light-weight foamed it is earth roadbed there is obvious " bridges formation " to act on, subgrade reaction centre is small, and both sides are big, Subgrade reaction distribution map is in the shape of a saddle, thus the moment of flexure suffered by road structure and shearing are larger, and brittle break easily occurs for roadbed;Pad Layer can mitigate the stress concentration of ground, adjust the differential settlement amount of roadbed, so as to reduce the tension of road structure and cut Stress.
The present invention have the characteristics that adaptation differential settlement ability it is strong, it is easy for construction, reduce investment outlay, for Deep Thick Soft Ground Base, particularly broad way base significant effect, successfully solve the excessive technical barrier of deep soft foundation section settlement of subgrade.
The construction method of the hassock layer Foam lightweight soil road structure in above-mentioned deep soft foundation section, comprises the following steps:
Step 1:Cleaning leveling construction site, removes place branch, mud, before cushion construction, substrate without obvious ponding, without pine Weak soil.Design requirement making hassock layer is pressed after the acceptance(check) of base.
Step 2:Lateral baffle plate and segmentation template are installed, it is completely light-weight foamed earth roadbed using segmentation, subregion, comprehensive Laminated pouring.For light-weight foamed earth roadbed placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, is put using step Slope, the i.e. width of after-pouring layer are less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5.Longitudinal section length 10m ~ 20m, use false form between longitudinally adjacent cast section, laying 1~2cm thickness plastic foamboards after plate.Form removal to be achieved Intensity is to remove false form, leave plastic foamboard and must assure that vertical as movement joint, movement joint.One layer is often poured Foam lightweight soil lays layer of metal net, and wire netting have to be off in deformation joint, in the light-weight foamed coagulation that last layer pours Next layer is poured before native initial set.
Step 3:After light-weight foamed concrete reaches design strength and acceptance(check), plant native bound edge and form protective layer, plant The thickness of soil is not less than 1m.
Step 4:Carry out supercrust and the construction of other affiliated facilities.
Present disclosure is not limited to cited by embodiment, and those of ordinary skill in the art are by reading description of the invention And any equivalent conversion taken technical solution of the present invention, it is that claim of the invention is covered.

Claims (8)

1. the hassock layer Foam lightweight soil road structure in deep soft foundation section, it is characterised in that:
It is bottom-up including hassock layer(1)It is light-weight foamed earth roadbed(2)And supercrust;
Hassock layer(1)Along road longitudinal direction making on deep soft soil foundation;
It is light-weight foamed earth roadbed(2)Placement layer by layer is in hassock layer(1)On, every two layers of placement layer by layer it is light-weight foamed earth roadbed (2)Between be provided with galvanized wire mesh(3);Light-weight foamed earth roadbed top surface is provided with supercrust.
2. the hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, it is characterised in that:
Along light-weight foamed earth roadbed(2)Longitudinal direction is provided with movement joint(4).
3. the hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, it is characterised in that:
It is light-weight foamed earth roadbed(2)Plant native bound edge and form protective layer in both sides(5).
4. the hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, it is characterised in that:
Hassock layer(1)Making is on deep soft soil foundation, thickness range 0.5m ~ 1.2m.
5. the hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, it is characterised in that:
It is light-weight foamed earth roadbed(2)For placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, using step slope, i.e., The width of after-pouring layer is less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5.
6. the hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 2, it is characterised in that:
It is light-weight foamed earth roadbed every 10m ~ 20m one of movement joint of setting(4), the width of movement joint is 1cm ~ 2cm.
7. the hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 3, it is characterised in that:
Plant soil in roadbed both sides(5)Bound edge, the thickness for planting soil are not less than 1m.
8. the construction method of the hassock layer Foam lightweight soil road structure in deep soft foundation section, it is characterised in that:
Comprise the following steps:
Step 1:Cleaning leveling construction site, presses design requirement making hassock layer after the acceptance(check) of base;
Step 2:Lateral baffle plate and segmentation template are installed, it is completely light-weight foamed earth roadbed using segmentation, comprehensively subregion, layering Cast;For light-weight foamed earth roadbed placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, using step slope, i.e., The width of after-pouring layer is less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5;Longitudinal section length 10m ~ 20m, use false form between longitudinally adjacent cast section, laying 1~2cm thickness plastic foamboards after plate;Strength of mould stripping to be achieved It is to remove false form, leaves plastic foamboard and ensure vertical as movement joint, movement joint;Often poured one layer it is light-weight foamed Soil one layer of galvanized wire mesh of laying, galvanized wire mesh net disconnects in deformation joint, in the light-weight foamed concrete that last layer pours Next layer is poured before initial set;
Step 3:After light-weight foamed concrete reaches design strength and acceptance(check), plant native bound edge and form protective layer, plant soil Thickness is not less than 1m;
Step 4:Carry out supercrust and the construction of other affiliated facilities.
CN201710826281.XA 2017-09-14 2017-09-14 The hassock layer Foam lightweight soil road structure and construction method in deep soft foundation section Pending CN107805987A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108797249A (en) * 2018-04-28 2018-11-13 广西驰胜农业科技有限公司 The construction method of soft soil roadbed high roadbed steep slope road section Foam lightweight soil
CN111877070A (en) * 2020-06-16 2020-11-03 中交第三公路工程局有限公司 Construction method of foamed light soil
CN112281580A (en) * 2020-10-21 2021-01-29 广东恒辉建设集团股份有限公司 Soft foundation filling structure and soft foundation filling method for stadium
CN112942357A (en) * 2021-01-28 2021-06-11 中国电建集团华东勘测设计研究院有限公司 Ultra-light foam concrete deep cushion layer using waste foam particles as filler and preparation method thereof
CN113308952A (en) * 2021-05-14 2021-08-27 浙大城市学院 Construction method of fabricated retaining wall bridgehead foam concrete light embankment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108797249A (en) * 2018-04-28 2018-11-13 广西驰胜农业科技有限公司 The construction method of soft soil roadbed high roadbed steep slope road section Foam lightweight soil
CN111877070A (en) * 2020-06-16 2020-11-03 中交第三公路工程局有限公司 Construction method of foamed light soil
CN111877070B (en) * 2020-06-16 2021-11-09 中交第三公路工程局有限公司 Construction method of foamed light soil
CN112281580A (en) * 2020-10-21 2021-01-29 广东恒辉建设集团股份有限公司 Soft foundation filling structure and soft foundation filling method for stadium
CN112942357A (en) * 2021-01-28 2021-06-11 中国电建集团华东勘测设计研究院有限公司 Ultra-light foam concrete deep cushion layer using waste foam particles as filler and preparation method thereof
CN113308952A (en) * 2021-05-14 2021-08-27 浙大城市学院 Construction method of fabricated retaining wall bridgehead foam concrete light embankment

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