CN102605797B - Peg and plate shell structure for controlling deformation of soft soil foundation under embankment - Google Patents
Peg and plate shell structure for controlling deformation of soft soil foundation under embankment Download PDFInfo
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- CN102605797B CN102605797B CN201210105709.9A CN201210105709A CN102605797B CN 102605797 B CN102605797 B CN 102605797B CN 201210105709 A CN201210105709 A CN 201210105709A CN 102605797 B CN102605797 B CN 102605797B
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Abstract
The invention discloses peg and plate shell structural technology for controlling deformation of a soft soil foundation under an embankment. The peg and plate shell structural technology is characterized by including steps of flattening a construction field, paving a cushion layer according to hardness of a surface soil layer, and leading the surface soil layer to be capable of bearing construction machinery; pouring pegs on the spot, or driving the prefabricated pegs into the foundation, and mounting formworks on the edges of the embankment; placing a reinforcement cage and leading the reinforcement cage to be connected with connecting reinforcements on the pegs; pouring concrete plates; and building the embankment on the concrete plates after the concrete plates are maintained to achieve proper strength. The lengths of the pegs range from 2m to 5m, pitches among the pegs range from 3m to 10m, the pegs can be arranged in a quincunx or square manner, the thicknesses of the reinforcement concrete plates range from 30cm to 50cm, and the widths of the reinforcement concrete plates are equal to the width of the bottom of the embankment. The peg and plate shell structural technology eliminates the problem that the 'pot-bottom-shaped' differential settlement is produced on the cross section of an embankment treated by a conventional method, longitudinal cracks of the foundation are avoided, buckling failure of a slope of the foundation is also avoided, the earthwork volume of filled soil of the foundation is reduced, settlement is low after construction, work period is short, and manufacturing cost is low.
Description
Technical field
The invention belongs to technical field of civil engineering, particularly stub-the plate and shell structure of soft soil foundation Deformation control under embankment.
Background technology
China is just carrying out large-scale infrastructure construction, and most of engineering construction is positioned at China coast and soft clay area, lake, ground.On soft soil foundation, building highway, high-speed railway, river dike etc., need to process soft soil foundation, to control settlement after construction.For high-grade embankment, settlement after construction is defined as pavement construction and finishes the sedimentation in 15 years afterwards, according to < < highway subgrade design specifications > > (JTGD30-2004), the control technique of settlement after construction of end of the bridge section is at 10cm, the control technique of settlement after construction of end of the bridge changeover portion is at 20cm, and the control technique of settlement after construction in general section is at 30cm.When natural ground settlement after construction can not meet the demands, carrying out in the past two conventional class methods of ground processing is consolidation and compound foundation method.On deep soft soil foundation, build high-grade embankment, after adopting consolidation to process, in ground originally without drainage channel, consolidation settlement is very little, adopt band drain in ground, to form on the contrary drainage channel, therefore often at the construction period soil body, do not reach completely fixed, in pavement construction finishes certain hour, produce on the contrary larger consolidation settlement, cause road surface settlement after construction to increase, result of use is not good.And adopt compound foundation method to process, be divided into flexible pile composite foundation and rigid pile composite foundation two classes, flexible pile is as cement mixing method (slurry, wet spraying pile), sand pile and broken stone pile etc., rigid pile has CFG stake, pile for prestressed pipe (PHC stake) and major diameter cast-in-situ concrete thin-wall (PCC stake) etc., flexible pile composite foundation is generally processed 15 meters of below grounds only with interior soft foundation, should not be for deep layer processing soft soil, and due to the flexible nature of stake, its pile body still has sedimentation to produce in reinforcing scope; Rigid pile is to process one of feasible method of deep layer weak soil, and consolidation effect is good, but ground processing cost is high.
In addition,, for the high-grade embankment on deep soft soil foundation, because embankment filled soil load is a kind of flexible load, easily produce distortion.No matter adopt consolidation or adopt compound foundation method to carry out ground processing, the problem that all exists the subsidiary stress at embankment center and embankment edge to vary in size, the subsidiary stress at general embankment center is greater than embankment edge, the settling amount that embankment center is produced is larger than embankment edge, thereby make earth's surface produce the differential settlement of " the bottom of a pan " shape, when serious, cause highway to produce longitudinal crack, comfortableness and the safety of impact driving.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, provide that a kind of cost is low, quick construction, do not produce the stub-plate and shell structure of soft soil foundation Deformation control under the embankment of differential settlement of " the bottom of a pan " shape.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Stub-plate and shell structure of soft soil foundation Deformation control under embankment, is characterized in that: smooth construction plant, depending on surface soil layer soft or hard situation, lay bed course, and make to reach the construction machinery requirement of marching into the arena; Cast on-site stub, or precast piling is driven into ground, the length of stub is 2～5m, pile spacing is 3～10m, is arranged to quincunx or square; At embankment edge installation form; Place reinforcing cage, reinforcing cage is connected with the connecting reinforcement on stub; Concreting plate, steel concrete plate thickness is 30～50cm, width equals embankment bottom width; Until concrete slab maintenance, reach after intensity, thereon railway embankment using; Or other plate and shell structures such as beam-shell combining structure that deflection deformation is little, the mixed combining structure of concrete-steel plate, ribbed steel shell structure, railway embankment using on plate and shell structure be set on stub.
Connecting reinforcement is inserted at described cast-in-place stub top before material of body of a pile solidifies, and connecting reinforcement stretches out stake top 10～30cm;
Reserved connecting reinforcement when described precast piling is prefabricated in the factory, connecting reinforcement stretches out stake top 10～30cm;
Described stub top can arrange cover plate.
Described stub is positioned at that stake in the middle of embankment is long can be longer than the stake at embankment edge, and stake end is positioned at Soft Soil Layer.
Described stub is circular cross-section solid pile or pile tube, X-shaped stake, Y shape stake.
Described stub end face arranges pile cover.
Advantage of the present invention and effect are:
Sheet pile technology of the present invention, belongs to shallow foundation category, more much lower than deep foundation costs such as general stake raft, stake plates, and easy construction, during construction pile foundation, can directly be pressed into, and does not need pile driver, and speed of application is fast.
The armored concrete slab of stub and rigidity is set under embankment filled soil, the bending rigidity of armored concrete slab itself is very large, stub is played a supporting role to concrete slab itself, therefore be out of shape little, eliminated the relative settlement at embankment edge and embankment center, make the whole evenly sinking of embankment, avoided roadbed to produce longitudinal crack.
Because concrete slab intensity is very high, so can there is not unstable failure in side slope of embankment, and side slope is steepening suitably, thereby reduced side's amount of embankment filled soil, saved construction costs.
Adopt stub and rigid slab to replace conventional method for processing foundation, make embankment flexible load become rigid load, produce bulk deformation, indifference sedimentation, does not need ground to process to eliminate relative settlement, has therefore saved expensive ground disposal cost.
Compare with consolidation, the present invention is because discharging consolidation is slow, and after work, in certain hour, sedimentation is little, and settlement after construction is little.Compare with compound foundation method, cost of the present invention is low.Duration of the present invention is short, only considers to banket the duration, and particularly suitable is with general section on deep soft soil foundation.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Protection scope of the present invention is not limited with the specific embodiment, but is limited by claim.
Accompanying drawing explanation
Fig. 1 rigidity sheet pile of the present invention technology schematic diagram;
Fig. 2 the present invention and natural ground and band drain scheme sedimentation～time graph comparison diagram
Fig. 3 the present invention and natural ground and band drain scheme embankment cross section settlement after construction comparison diagram
In figure: 1 is soft foundation, 2 is stub, and 3 is armored concrete slab, and 4 is geotextiles, and 5 is embankment, and 6 is ground surface.
The specific embodiment
As shown in Figure 1,2 and 3, the stub-plate and shell structure of soft soil foundation Deformation control under a kind of embankment, first smooth construction plant, lays bed course depending on surface soil layer soft or hard situation, makes to reach the construction machinery requirement of marching into the arena.In soft foundation (1), first set stub (2), long 2～the 5m of stub (2), pile spacing is 3～10m, can be arranged to quincunx or square, stub (2) can be various types of rigid pile such as circle, X-shaped, Y shape, cross, adopt cast-in-place or prefabricated form, stub arranges cover plate on (2).The long variation of stub (2) stake, being positioned at that stake in the middle of embankment (5) is long can be longer than the stake at embankment (5) edge, because stake is shorter, therefore do not penetrate Soft Soil Layer, stake end is positioned at Soft Soil Layer, and stub (2) mainly plays supporting armored concrete slab (3) and reduces the effect of the amount of deflection of armored concrete slab (3).At the upper armored concrete slab (3) of arranging of stub (2), armored concrete slab (3) adopts on-the-spot integrated poured mode, generally at embankment edge installation form; Place reinforcing cage, reinforcing cage is connected with the connecting reinforcement on stub, and connecting reinforcement stretches out stake top 10～30cm; Concreting plate, steel concrete plate thickness is 30～50cm, width equals embankment bottom width.After concrete curing reaches intensity, in the upper railway embankment using (5) of armored concrete slab (3), embankment (5) side slope can adopt geotextiles (4) parcel.Armored concrete slab (3) surface can flush with ground surface (6), or is positioned under ground surface (6).Armored concrete slab of the present invention (3) also available other structures replaces, as beam-shell combining structure, concrete-steel plate combination construction, ribbed steel shell structure etc., as long as it is little to meet this plate and shell structure deflection deformation under embankment loading.
Present embodiment is calculated the embankment on a deep soft soil foundation, and in calculating: embankment bottom width is taken as 38m, embankment top width is taken as 29m, embankment filled soil height is 3m, and thickness of soft soil is 15m, calculates the long 3m of stub stake, thickness of slab 40cm, band drain length 15m, spacing of prefabricated drain 1.3m.Contrasted the settlement Control effect (Fig. 2 and Fig. 3) of the present invention and consolidation scheme and natural ground.Result of calculation shows: in ground, beat after band drain, the rate of settling is accelerated greatly, and therefore in same consolidation time, the settling amount of this processing method is maximum; Natural ground is because Soft Soil Layer is deep, so consolidation rate is slower, and sedimentation development trend is much slower than adopting band drain; And after adopting stake plated construction to process, settlement of foundation is less.Therefore, for deep soft soil foundation, be not that the more drainage channels of setting are better, on the contrary, in ground, originally there is no drainage channel, ground consolidation is slow, settlement after construction is little, has after drainage channel and makes on the contrary ground consolidation speed accelerate, but can not guarantee to reach completely fixed in the construction period, therefore cause settlement after construction to increase, play reaction.From Fig. 3 settlement after construction result of calculation, more can describe the problem, suppose that the construction period is 1 year (365 days) in figure, the sedimentation that deducts the 1st year with the sedimentation of the 16th year (5840 days) is settlement after construction.From figure, result can be found out, the settlement after construction after embankment center sheet pile is processed is 13cm, and the settlement after construction that natural ground is not processed is 23cm, and adopting band drain to process rear settlement after construction is 45cm, and the effect that visible stake plate is processed is best.In figure, result also shows, after employing stake plate is processed, the relative settlement at embankment center and embankment edge is minimum, almost there is no relative settlement, has further verified the effect of the rear embankment bulk deformation of sheet pile processing; And natural ground and band drain process after the relative settlement at embankment center and embankment edge larger, reach respectively 20cm and more than 30cm, thereby make embankment cross section produce the differential settlement of " the bottom of a pan " shape, cause road surface to produce the possibility of longitudinal crack.
From the above analysis, the stub-plate and shell structure of soft soil foundation Deformation control under embankment, has effectively controlled embankment settlement after construction, and embankment cross-sectional deformability is even, and speed of application is fast, cost is low, is the optimization technique of processing general section deep soft foundation.
Claims (2)
1. stub-the plate and shell structure of soft soil foundation Deformation control under embankment, it is characterized in that: precast piling is driven into soft soil foundation, or cast on-site stub, the length of stub is 2 ~ 5m, being positioned at the long ratio of stub stake in the middle of embankment, to be positioned at the stub stake at embankment edge long, pile spacing is 3 ~ 10m, is arranged to quincunx or square; At embankment edge installation form; Place reinforcing cage, reinforcing cage is connected with the connecting reinforcement on stub; Concreting plate, steel concrete plate thickness is 30 ~ 50cm, width equals embankment bottom width; Until concrete slab maintenance, reach after intensity, thereon railway embankment using.
2. stub-the plate and shell structure of soft soil foundation Deformation control under embankment according to claim 1, is characterized in that: connecting reinforcement is inserted at cast-in-place stub top before material of body of a pile solidifies, and connecting reinforcement stretches out stake top 10 ~ 30cm.
3. stub-the plate and shell structure of soft soil foundation Deformation control under embankment according to claim 1, is characterized in that: reserved connecting reinforcement when precast piling is prefabricated in the factory, connecting reinforcement stretches out stake top 10 ~ 30cm.
4. stub-the plate and shell structure of soft soil foundation Deformation control under embankment according to claim 1, is characterized in that: stub top arranges cover plate.
5. stub-the plate and shell structure of soft soil foundation Deformation control under embankment according to claim 1, is characterized in that: stub is circular cross-section solid pile or pile tube, X-shaped stake, Y shape stake.
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| CN102605797B true CN102605797B (en) | 2014-04-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211052A (en) * | 2020-09-29 | 2021-01-12 | 中南大学 | Long and short pile-plate structure for controlling uneven settlement of transition section of highway and construction method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592568B (en) * | 2016-12-28 | 2018-06-26 | 浙江理工大学 | A kind of terrace uniform settlement structure and construction method |
| CN110952386B (en) * | 2019-12-17 | 2021-02-02 | 同济大学 | Micro pile reinforcing method for controlling transverse uneven settlement of high-speed rail wide embankment |
| CN111335308A (en) * | 2020-04-25 | 2020-06-26 | 开封市通达公路勘察设计有限公司 | Method for processing passage under soft foundation by using small prefabricated pile group |
Citations (4)
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| JP2006045793A (en) * | 2004-07-30 | 2006-02-16 | Sekkeishitsu Soil:Kk | Structure of foundation |
| RU2006131655A (en) * | 2006-09-05 | 2008-03-10 | Федеральное государственное унитарное предпри тие"Научно-исследовательский центр "Строительство", ФГУП "НИЦ "Строительство" (RU) | METHOD FOR ESTABLISHING A PLATE AND PILED BASE |
| CN101368383A (en) * | 2008-09-11 | 2009-02-18 | 中国科学院武汉岩土力学研究所 | Method for treating soft soil roadbed by artificial composite crust layer |
| CN101440622A (en) * | 2008-12-17 | 2009-05-27 | 何志红 | CFG pile, pipe pile embankment reinforcement system and construction method thereof |
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2012
- 2012-04-12 CN CN201210105709.9A patent/CN102605797B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006045793A (en) * | 2004-07-30 | 2006-02-16 | Sekkeishitsu Soil:Kk | Structure of foundation |
| RU2006131655A (en) * | 2006-09-05 | 2008-03-10 | Федеральное государственное унитарное предпри тие"Научно-исследовательский центр "Строительство", ФГУП "НИЦ "Строительство" (RU) | METHOD FOR ESTABLISHING A PLATE AND PILED BASE |
| CN101368383A (en) * | 2008-09-11 | 2009-02-18 | 中国科学院武汉岩土力学研究所 | Method for treating soft soil roadbed by artificial composite crust layer |
| CN101440622A (en) * | 2008-12-17 | 2009-05-27 | 何志红 | CFG pile, pipe pile embankment reinforcement system and construction method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211052A (en) * | 2020-09-29 | 2021-01-12 | 中南大学 | Long and short pile-plate structure for controlling uneven settlement of transition section of highway and construction method thereof |
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