CN102561132B - Plate supporting type embankment structure for post-construction settlement controlling of deep soft soil foundation on high-grade highway - Google Patents

Plate supporting type embankment structure for post-construction settlement controlling of deep soft soil foundation on high-grade highway Download PDF

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CN102561132B
CN102561132B CN201210007123.9A CN201210007123A CN102561132B CN 102561132 B CN102561132 B CN 102561132B CN 201210007123 A CN201210007123 A CN 201210007123A CN 102561132 B CN102561132 B CN 102561132B
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embankment
foundation
concrete slab
settlement
soft soil
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CN102561132A (en
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丁选明
刘汉龙
庄妍
陈育民
高德清
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Hohai University HHU
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Hohai University HHU
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Abstract

The invention discloses a plate supporting type embankment structure for post-construction settlement controlling of a deep soft soil foundation on a high-grade highway. A reinforced concrete plate is arranged as a hard shell layer between the soft soil foundation and embankment earth filling, the thickness of the concrete plate ranges from 300 mm to 1000 mm, the concrete plate can be located above the earth surface or be partly embedded into the foundation or be fully embedded into the foundation, a cushion layer can be arranged at the bottom of the concrete plate, the slope ratio of the embankment earth filling is smaller than 1:1.5, the slope surface is wrapped by geotextile, a low retaining walls can be arranged on each of two sides of the concrete plate, the two sides of the concrete plate are close to the edges of the embankment, the bottom of each low retaining wall is fixed with the concrete plate, and overall deformation is achieved. By means of the plate supporting type embankment structure for the post-construction settlement controlling of the deep soft soil foundation on the high-grade highway, differential settlement of the embankment edges and the embankment center is eliminated, longitudinal cracks of the foundation are avoided, an embankment side slope can not lose stability and not be damaged, and compensation earth volume of the embankment earth filling is decreased. Compared with drainage concretion methods, by means of the plate supporting type embankment structure, post-construction settlement is effectively reduced. Compared with composite foundation methods, the plate supporting type embankment structure is low in cost. According to the plate supporting type embankment structure for the post-construction settlement controlling of the deep soft soil foundation on the high-grade highway, construction time is short, construction time of the earth filling is merely considered, and the plate supporting type embankment structure is particularly applicable to ordinary road sections on the deep soft soil foundation.

Description

High-grade highway deep soft soil foundation the control technique of settlement after construction plate holds formula embankment structure
Technical field
The invention belongs to technical field of civil engineering, particularly high-grade highway deep soft soil foundation the control technique of settlement after construction plate holds formula embankment technology.
Background technology
There is a large amount of soft soil foundations in China coast and interior ground lakeland, building highway, high-speed railway, river dike etc. on soft soil foundation, need to process soft soil foundation, to control settlement after construction (being the sedimentation producing after embankment puts into effect) within a period of time in 10~15 years of overhaul.For high-grade highway, general section the control technique of settlement after construction requires as 30cm, and end of the bridge section is 10cm.The control technique of settlement after construction method for deep soft soil foundation generally has two classes: a class is consolidation, as preloading, vacuum method, precipitating, pre-pressing method etc., generally needs in conjunction with vertical plastic draining board as drainage channel; Another kind of is compound foundation method, can be subdivided into again flexible pile composite foundation and rigid pile composite foundation method.Flexible pile is as cement mixing method (slurry, wet spraying pile), sand pile and broken stone pile etc., and rigid pile has CFG stake, pile for prestressed pipe (PHC stake) and cast-in-situ concrete large-diameter tubular pile (PCC stake) etc.Draining preloading technology maturation, construction is simple, can process the degree of depth and reach 20 meters of above soft bases, but its main deficiency is that the precompressed processing time is long, and after processing, settlement after construction is larger, and compensation earth volume is large, and operation way of escape levee crown reparation compensation cubic metre of earth can produce new load, causes again new sedimentation.Flexible pile composite foundation is generally processed 15 meters of below grounds only with interior soft foundation, should not be used for deep layer processing soft soil, and in reinforcing scope due to the flexible nature of stake, its pile body still has sedimentation to produce.The rigid pile such as CFG are to process one of feasible method of deep layer weak soil, and stake footpath is generally 50 centimetres of left and right, and pilespacing is generally not more than 1.5 meters, and consolidation effect is good, but ground processing cost is very high.For the high-grade embankment on deep soft soil foundation, owing to being a kind of flexible load, therefore adopt above-mentioned processing method to carry out after reinforcing soft foundation, the subsidiary stress at embankment center and embankment edge varies in size, the subsidiary stress at embankment center is greater than embankment edge, makes the settling amount at embankment center larger than embankment edge, thereby makes 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, settlement after construction high-grade highway deep soft soil foundation the control technique of settlement after construction plate little, that do not produce " the bottom of a pan " shape differential settlement hold formula embankment structure.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of high-grade highway deep soft soil foundation the control technique of settlement after construction plate holds formula embankment structure, between soft foundation and embankment filled soil, armored concrete slab is set as crust layer, it is characterized in that: concrete slab thickness is 300mm~1000mm; Concrete slab can be positioned on earth's surface, or partly imbeds ground, or all imbeds ground; Bed course can be laid in concrete slab bottom; The gradient of embankment filled soil is steeper, and slope ratio is less than 1:1.5, domatic employing geotextiles parcel; Concrete slab can arrange low barricade near embankment both sides of edges; Concrete slab arranges shrinkage joint in road Cross Section direction; Concrete slab variable thickness.
The material that bed course is laid in described concrete slab bottom can be rubble, graded sand and stone, building masonry rubbish etc.
Described embankment filled soil is divided into multistage filling, domatic one deck geotextiles parcel that adopts respectively that every one-level is banketed.
Described barricade is vertical with concrete slab, and is fixed together with concrete slab, bulk deformation, and wall height is not more than embankment filled soil height.
Described shrinkage joint should be arranged on the depth of fill and geological conditions changes little position, cross section, and shrinkage joint direction is vertical with road travel direction.
Described concrete slab can be adjusted thickness, thickness of slab attenuation when foundation soil is harder, thickness of slab thickening when foundation soil is softer according to the variation of geological condition along road direction.
The embankment filled soil on described concrete slab top can be selected light material, as EPS particle light mixed soil, bubble lightweight composite soil etc., alleviates embankment deadweight, with concrete slab acting in conjunction compatible deformation, controls better Embankment Subsidence.
Advantage of the present invention and effect are:
The armored concrete slab of rigidity is set on soft foundation, under embankment filled soil, the bending rigidity of armored concrete slab itself is very large, is therefore out of shape littlely, has eliminated the relative settlement at embankment edge and embankment center, embankment entirety is evenly sunk, avoided roadbed to produce longitudinal crack.
By concrete slab is partly or entirely imbedded to ground, in concrete slab bottom, lay bed course, bearing capacity of foundation soil can be met the demands, and convenient construction.
Course can adopt building waste, has played the effect of environmental protection.
Because concrete slab intensity is very high, can there is not unstable failure in side slope of embankment therefore, and side slope is steepening suitably, or barricade is set, thereby reduced side's amount of embankment filled soil, saved construction costs.
In concrete slab both sides, barricade can be set, the fixing entirety that forms of barricade and concrete slab, the wall of barricade is subject to the effect of soil body lateral pressure, makes the concrete slab of bottom produce the moment of flexure of top tension, bottom pressurized; The soil pressure that acts on concrete floor produces the moment of flexure that makes concrete slab produce upper portion pressurized, bottom tension, and both just in time cancel out each other, and make the amount of deflection of concrete slab and stress all less.In addition, it is more even that barricade can make top banket, and keeps stress balance on base plate, is equivalent to evenly distributed load.
Adopt 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 processing to eliminate relative settlement, has therefore saved expensive ground disposal cost.
Compared 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.Compared 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
The plate that Fig. 1 concrete slab of the present invention is positioned on earth's surface holds formula embankment schematic diagram;
The plate that Fig. 2 concrete slab of the present invention is positioned under earth's surface holds formula embankment schematic diagram;
Fig. 3 the present invention has the plate of barricade to hold formula embankment schematic diagram;
Fig. 4 the present invention and band drain are processed embankment center sedimentation~time graph comparison diagram;
Fig. 5 the present invention and band drain are processed embankment edge sedimentation~time graph comparison diagram;
Fig. 6 the present invention and band drain are processed embankment cross section settlement after construction comparison diagram.
In figure: 1 is soft foundation, 2 is bed course, and 3 is concrete slab, and 4 is geotextiles, and 5 is embankment, and 6 is barricade, and 7 is ground surface.
The specific embodiment
As shown in Figure 1,2 and 3, a kind of high-grade highway deep soft soil foundation the control technique of settlement after construction plate holds formula embankment structure, between soft foundation (1) and embankment (5), armored concrete slab (3) is set as crust layer; Armored concrete slab (3) rigidity is large, the ability of resistance to deformation is strong, under the Action of Gravity Field of embankment (5), the relative deformation of plate center and panel edges is less, be that amount of deflection is less, embankment while making foundation settlement (5) sinks together with forming entirety with concrete slab (3), does not produce pan bottom shape relative settlement.Concrete slab (3) can be positioned on ground surface (7) (as Fig. 1), or partly imbeds ground, or all imbeds ground, is positioned under ground surface (7) (as Fig. 2); The advantage that concrete slab (3) is imbedded ground be to make at the bottom of plate stressed more evenly, reduce at the bottom of plate subsidiary stress and reduce sedimentation.Bed course (2) is laid in concrete slab (3) bottom; Because ground surface (7) is weak soil, laying bed course (2) is in order to make topsoil have certain bearing capacity, and convenient construction machinery and personnel march into the arena.The gradient of embankment (5) is steeper, and slope ratio is less than 1:1.5, domatic employing geotextiles (4) parcel; Geotextiles (4) is divided into multilayer according to the thickness of embankment (5) stage filling, and after geotextiles (4) parcel, it is stable that grade of side slope steepening also can keep, and at the bottom of slope, be the concrete slab (3) of rigidity, do not have the problem of slope and land slide.Concrete slab (3) also can arrange concrete guard wall (6) near embankment (5) both sides of edges, and barricade (6) is more favourable to the stress deformation of concrete slab (3).In side slope, wrap up geotextiles (4) or the amount of banketing that barricade (6) can be saved embankment (5) is set.
Take the Soft Soil Layer of the 25m degree of depth as example, suppose that the depth of fill is 3m below, embankment bottom width is 30m, and embankment end face width is 21m.Fig. 4 has provided the present invention and band drain is processed embankment center sedimentation~time graph comparison diagram, as can be seen from Fig., Deep Thick Soft Ground has formed drainage channel after adopting band drain to process in ground, accelerated soil solidifying, therefore foundation settlement speed quickening, year settling amount increase; And adopt plate to hold after the technical finesse of formula embankment, and in deep soft soil foundation, there is no drainage channel, therefore soil solidifying is extremely slow, and foundation settlement is much smaller compared with band drain scheme.In high-grade embankment engineering construction, General Definition settlement after construction is: the sedimentation occurring within 15 years after pavement construction finishes.During this example assumes construction 1 year, pavement construction finishes, and is settlement after construction so since the sedimentation of the 1st year to the 16th year, and in Fig. 4, S1 is the settlement after construction of band drain processing scheme, and S2 is the settlement after construction that plate of the present invention holds formula embankment scheme.Fig. 5 has provided the present invention and band drain is processed embankment edge sedimentation~time graph comparison diagram.In figure, also reflected the fast feature of the band drain scheme rate of settling, but ground consolidation reaches (as 20 years) after certain hour, the final settlement difference of the present invention and band drain scheme is little.
Fig. 6 gives the present invention and band drain is processed embankment cross section settlement after construction comparison diagram.From scheming, band drain scheme embankment edge settlement after construction is 10.3cm, and is 18.8cm after embankment center sedimentation work, and embankment center sedimentation, much larger than embankment edge, forms " the bottom of a pan " shape at subgrade cross section; It is 8.5cm that plate holds formula embankment scheme embankment edge settlement after construction, and embankment center settlement after construction is 9.4cm, and embankment center sedimentation and embankment edge settlement difference are less, does not form " the bottom of a pan " shape.This is in embankment bottom, to have the rigid slab that rigidity is very large because plate holds formula embankment scheme, embankment differential deformation is reduced, form the form that entirety is evenly sunk, and band drain scheme, the flexible embankment of ground top direct filling, therefore embankment centerand edge differential deformation is large, and this further illustrates superiority of the present invention, be the present invention not only total settlement is little, and embankment differential deformation is little.

Claims (6)

1. high-grade highway deep soft soil foundation the control technique of settlement after construction plate holds a formula embankment structure, between soft foundation and embankment filled soil, armored concrete slab is set as crust layer, it is characterized in that: concrete slab thickness is 300mm ~ 1000mm; Concrete slab can be positioned on earth's surface, or partly imbeds ground, or all imbeds ground; Bed course is laid in concrete slab bottom; The gradient of embankment filled soil is steeper, and slope ratio is less than 1:1.5, domatic employing geotextiles parcel; Concrete slab can arrange concrete guard wall near embankment both sides of edges; Concrete slab arranges shrinkage joint in road Cross Section direction; Concrete slab variable thickness.
2. high-grade highway deep soft soil foundation the control technique of settlement after construction plate according to claim 1 holds formula embankment structure, it is characterized in that: the material that bed course is laid in concrete slab bottom is rubble, graded sand and stone, building masonry rubbish.
3. high-grade highway deep soft soil foundation the control technique of settlement after construction plate according to claim 1 holds formula embankment structure, it is characterized in that: embankment filled soil is divided into multistage filling, domatic one deck geotextiles parcel that adopts respectively that every one-level is banketed.
4. high-grade highway deep soft soil foundation the control technique of settlement after construction plate according to claim 1 holds formula embankment structure, it is characterized in that: barricade bottom is fixed together with concrete slab, bulk deformation, and wall height is not more than embankment filled soil height.
5. high-grade highway deep soft soil foundation the control technique of settlement after construction plate according to claim 1 holds formula embankment structure, it is characterized in that: expansion joint setting is in the depth of fill and the constant position, cross section of geological conditions.
6. high-grade highway deep soft soil foundation the control technique of settlement after construction plate according to claim 1 holds formula embankment structure, it is characterized in that: the embankment filled soil on concrete slab top is selected light material.
CN201210007123.9A 2012-01-11 2012-01-11 Plate supporting type embankment structure for post-construction settlement controlling of deep soft soil foundation on high-grade highway Active CN102561132B (en)

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CN106149497A (en) * 2015-04-02 2016-11-23 中国二十冶集团有限公司 A kind of sea sand roadbed side slope rock-steady structure and construction method
CN110158387B (en) * 2019-06-03 2021-09-17 上海港城建筑安装工程有限公司 Multilayer compacted roadbed for building protective dike and construction method thereof
CN110541336A (en) * 2019-09-11 2019-12-06 上海缘界体育发展有限公司 Structure of off-road track slope surface node and construction method thereof
CN110656546B (en) * 2019-09-24 2021-11-16 山东高速集团有限公司 Method for treating ultra-soft foundation shallow layer by using water-permeable concrete blocks

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Publication number Priority date Publication date Assignee Title
NL8500019A (en) * 1985-01-04 1986-08-01 Foundacon B V Pile-driven foundation construction method for car-park etc. - has pre-fabricated reinforced concrete panels supported on piles
JPH03247801A (en) * 1990-02-26 1991-11-06 Nishi Nippon Eng Kk Method for road construction
JPH06123101A (en) * 1991-12-16 1994-05-06 Hisao Kobayashi Constructing method for base using scrap-shaped rubber chip as aggregate and foundation ground
CN1380471A (en) * 2002-05-16 2002-11-20 王自成 Method for elimianting subsidence of backfilled roadbed, bridge abutment and culvert wall back
CN1948626A (en) * 2006-08-11 2007-04-18 周洪文 Treatment method of newly built high way railway engineering soft foundation
CN101368383B (en) * 2008-09-11 2010-04-14 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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8500019A (en) * 1985-01-04 1986-08-01 Foundacon B V Pile-driven foundation construction method for car-park etc. - has pre-fabricated reinforced concrete panels supported on piles
JPH03247801A (en) * 1990-02-26 1991-11-06 Nishi Nippon Eng Kk Method for road construction
JPH06123101A (en) * 1991-12-16 1994-05-06 Hisao Kobayashi Constructing method for base using scrap-shaped rubber chip as aggregate and foundation ground
CN1380471A (en) * 2002-05-16 2002-11-20 王自成 Method for elimianting subsidence of backfilled roadbed, bridge abutment and culvert wall back
CN1948626A (en) * 2006-08-11 2007-04-18 周洪文 Treatment method of newly built high way railway engineering soft foundation
CN101368383B (en) * 2008-09-11 2010-04-14 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

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