CN109736291A - One kind owing consolidation and blows on the base of alluvial plain that biological cement is reinforcing road bed and its construction method - Google Patents
One kind owing consolidation and blows on the base of alluvial plain that biological cement is reinforcing road bed and its construction method Download PDFInfo
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- CN109736291A CN109736291A CN201811582852.0A CN201811582852A CN109736291A CN 109736291 A CN109736291 A CN 109736291A CN 201811582852 A CN201811582852 A CN 201811582852A CN 109736291 A CN109736291 A CN 109736291A
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- 238000007596 consolidation process Methods 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 34
- 239000004568 cement Substances 0.000 title claims abstract description 27
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 18
- 239000010410 layer Substances 0.000 claims abstract description 105
- 239000004746 geotextile Substances 0.000 claims abstract description 81
- 230000002787 reinforcement Effects 0.000 claims abstract description 59
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 239000004575 stone Substances 0.000 claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 22
- 239000004927 clay Substances 0.000 claims abstract description 14
- 229920003023 plastic Polymers 0.000 claims abstract description 14
- 235000015097 nutrients Nutrition 0.000 claims description 28
- 230000002950 deficient Effects 0.000 claims description 24
- 239000004576 sand Substances 0.000 claims description 22
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- 241000894006 Bacteria Species 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 239000011083 cement mortar Substances 0.000 claims description 14
- 239000011440 grout Substances 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 13
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 12
- 108010046334 Urease Proteins 0.000 claims description 12
- 239000004202 carbamide Substances 0.000 claims description 12
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 11
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 11
- 239000001110 calcium chloride Substances 0.000 claims description 11
- 241000196324 Embryophyta Species 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 9
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- 238000000034 method Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
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- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
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- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000004566 building material Substances 0.000 claims description 3
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
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Landscapes
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Revetment (AREA)
Abstract
The invention belongs to Soft Ground field, it is related to a kind of consolidation of owing and blows that biological cement on the base of alluvial plain is reinforcing road bed and construction method.Grid broken stone pile in the roadbed, which is punched, owes under consolidation is blown alluvial plain base and is embedded in sleeping supporting course；Plastic draining board, which is squeezed into owe to consolidate, to be blown in the base of alluvial plain；Biological cement-grid reinforcement cushion is laid in the upper surface of grid broken stone pile；Biological cement-grid reinforcement cushion upper and lower surface is laid with non-woven geotextile；Non-woven geotextile and sealing film are sealed in the bottom rammed and fill out clay sealing ditch；Embankment filled soil fills on biological cement-grid reinforcement cushion upper surface non-woven geotextile；Biological waterproof layer is arranged in embankment filled soil upper surface and side；Soil layer is set on the biology waterproof layer of embankment side and plants slope-protecting vegetation, forms side slope of embankment ecological waterproof protective layer.The present invention has that structurally reasonable, bearing capacity is high, short construction period and advantages of environment protection, is a kind of green ecological structure being worthy to be popularized.
Description
Technical field
The invention belongs to foundation treatment technology field, it is related to a kind of road structure, more particularly to a kind of solid based on microorganism
The deficient consolidation of change technology blows on the base of alluvial plain that biological cement is reinforcing road bed and its construction method.
Background technique
Currently, since the demand to land resource is growing, to solve the problems, such as " having a large population and a few land ", many coastal cities
It takes extensive beach to enclose the mode filled out and opens up strand land resource energetically, reclamation by pumping filling is filled as a kind of economy, efficiently
Mode is widely used.But coastal area is limited to the limitation of sandstone material source resource, mostly uses dredging greatly
Mud carries out reclamation by pumping filling, and then causes to generate moisture content superelevation and the very poor deficient consolidation of Seep- Solidifying blows alluvial plain base.And such as
What, which is promoted, owes the concreteness that consolidation blows alluvial plain base, becomes one of the technical problem of current reclamation by pumping filling.
Currently, engineering circles carry out discharging consolidation, but long processing period to blowing-filling sludge ground frequently with technique of soft soil foundation treatment,
And there are still low bearing capacity, post-construction deformation is big the problems such as, can not effectively improve subgrade rating and control embankment stability.
Therefore, the road structure that a kind of bearing capacity is high, concreteness is good, stability is strong is needed.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, consolidation is owed the present invention provides one kind blow biology on the base of alluvial plain
Cement stabilization roadbed and its construction method are reinforced it is intended that blowing alluvial plain base to deficient consolidation by biological cement, and are tied
The improvement for closing drainage system promotes consolidation draining ability, to reduce moisture content, shortens construction period, thus solves the prior art
Concreteness, bearing capacity, stability deficiency technical problem.
To achieve the goals above, the present invention provides one kind to owe consolidation reinforcing road bed, the packet that blows on the base of alluvial plain biological cement
Include: the deficient consolidation blow on the base of alluvial plain biological cement it is reinforcing road bed include lower sleeping supporting course, owe consolidation and blow alluvial plain base, embankment, life
Object waterproof layer cultivates soil layer, slope-protecting vegetation, and blows between the base of alluvial plain in embankment and deficient consolidation, punches to owe to consolidate and blow alluvial plain
The Embankment Subsidence control structure of sleeping supporting course under base and insertion；
The Embankment Subsidence control structure includes the stake of biological cement-grid reinforcement cushion, multiple grid broken stone piles composition
Group pattern, vertical plastic draining board, sealing film, the first non-woven geotextile and rammer fill out clay sealing ditch；Biology cement-the lattice
Grid reinforcement cushion, which is laid on grid broken stone pile and owes consolidation, blows alluvial plain base upper surface；The plastic draining board insertion owes consolidation and blows silt
Ground is at away from lower sleeping supporting course preset distance；The sealing film is set in the interlayer of the first non-woven geotextile；First nothing
It spins geotextiles and is set to consolidate and blow between alluvial plain base upper surface and biological cement-grid reinforcement cushion lower surface；The sealing film with
The edge seal of first non-woven geotextile fills out clay sealing ditch bottom in rammer；
The embankment is in biological cement-grid reinforcement cushion upper surface；The biology waterproof layer is laid on embankment top
Face and side waterproofing geomembrane upper surface；The cultivation soil layer is laid on embankment side biology waterproof layer upper surface；The slope protection
Vegetation is planted in cultivation soil layer.
Further, it is by dredging silt hydraulic reclamation to predetermined absolute altitude that the deficient consolidation, which blows alluvial plain base, and natural drying is to pre-
It is formed after determining undrained shear strength；First non-woven geotextile is by first layer non-woven geotextile and second layer nonwoven geotechnique
The sandwich structure of cloth composition；The deficient consolidation blows alluvial plain base upper surface and is successively laid with first layer non-woven geotextile, close from the bottom to top
Sealer and second layer non-woven geotextile；Criss-cross chimney filter, structure are laid between the first layer non-woven geotextile and sealing film
Build the horizontal drainage system that consolidation blows alluvial plain base of owing.
Further, the grid broken stone pile is by circumferential three-dimensional geogrid-non-woven geotextile casing and unweathered
Roll rubble composition；The grid broken stone pile presses rectangular, rectangle or quincuncial arrangement, spacing 2.0-3.0m；The three-dimensional geotechnique
Grid-non-woven geotextile casing is by the first three-dimensional geogrid and the second non-woven geotextile along pile body length direction and pile body diameter
It is formed to interval binding is carried out；The tensile strength that first three-dimensional geogrid meets when elongation is 0.5% is not less than
300kN/m, the mesh size of the first three-dimensional geogrid are 15-25mm；The rubble of rolling is natural grading, and clay content is little
In 5%, maximum particle diameter is not more than 4cm.
Further, the biological cement-grid reinforcement cushion includes the second three-dimensional geogrid, waste tire aggregate-
Calcareous sand mixture, flexible grout pipe, flexible drain pipe and biological cement；Second three-dimensional geogrid is in biological cement-
Through-thickness layered arrangement layer 2-3 in grid reinforcement cushion；The mixture be filled in each the second three-dimensional geogrid of layer it
Between, mixture-grid reinforcement cushion, compactness 30-50% are constituted, mixture-grid reinforcement cushion upper surface is equipped with third
Layer non-woven geotextile；The flexible grout pipe is arranged in mixture-grid reinforcement cushion upper surface and third layer nonwoven geotechnique
Between cloth lower surface, for injecting urease-producing bacterium and nutrient solution into mixture-grid reinforcement cushion；The flexibility drain pipe cloth
It sets between mixture-grid reinforcement cushion lower surface and second layer non-woven geotextile upper surface, it is new for urease-producing bacterium to be discharged
Old metabolic waste liquid；The biology cement is the product that urease-producing bacterium carries out metabolism using nutrient solution.
Further, the flexible grout pipe and flexible drain pipe are flexible plastic pipe, and diameter is 30-50 mm；It is described
Flexible grout pipe and flexible drain tube wall are equipped with equally distributed small sircle hole, one layer of third nonwoven geotechnique of external each package
Cloth, end are connected with grouting pump and positive displacement pump respectively；Waste tire aggregate-calcareous sand the mixture by waste tyre particle,
Tyre strip is sufficiently mixed with calcareous sand, and waste tyre particle mass content is 5 ± 0.5%, and waste tire mass content is 10
± 0.5%；The waste tyre particle maximum particle diameter is no more than 3mm, tyre strip width 15-20mm, length 40-50mm；It is described
Calcareous sand maximum particle diameter is no more than 3mm.
Further, the biological waterproof layer is to spray nutrition by the biological cement mortar on embankment top and side
Liquid is formed by curing；The biology cement mortar is biological mud and the mixed uniformly product of medium coarse sand 1:10 in mass ratio；It is described
1.0h is mixed by the nutrient solution of 0.5 mol/L of isometric urease-producing bacterium and molar concentration in biological mud, then stands deposition
Supernatant acquisition is filtered out after 0.5h, the nutrient solution is the mixed liquor of urea and calcium chloride, the molar concentration of urea and calcium chloride
Than for 1:1；The laying depth of the biology cement mortar is 10-15cm；The partial size of the medium coarse sand is 0.5-2.0mm.
To achieve the goals above, other side according to the invention provides a kind of foregoing consolidation of owing and blows
The reinforcing road bed construction method of biological cement on the base of alluvial plain, comprising the following steps:
Step 1: blowing-filling sludge foundation construction:
On lower sleeping supporting course, using conventional hydraulic reclamation technology by dredging silt hydraulic reclamation to target absolute altitude, alluvial plain base is blown in formation,
And natural drying to undrained shear strength is not less than 50kPa；
Step 2: it builds temporary working platform:
After the completion of step 1, bamboo fragrant plant, interim non-woven geotextile and interim are laid with respectively from the bottom to top blowing alluvial plain primary surface
Then three-dimensional geogrid is applied and inserts vertical plastic draining board, carry out discharging consolidation by piling prepressing, the discharging consolidation period is not low
In 3 months, then one layer of geotechnical grid was laid on interim three-dimensional geogrid and fills rubble building temporary working platform, and really
The stake position for the grid broken stone pile that fixes；
Step 3: grid the Macadam Pile Construction:
After the completion of step 2, under successively stake holes is excavated in progress stake position, vibration hammer is transferred in pile pipe to predetermined depth, pile pipe
It puts and launches rubble, intermittent vibration in three-dimensional geogrid-non-woven geotextile casing, three-dimensional geogrid-non-woven geotextile casing
Tube drawing is moved to ground pile step；
Step 4: biological cement-grid reinforcement cushion construction and embankment:
After the completion of step 3, the building material of temporary working platform is recycled, including bamboo fragrant plant, interim non-woven geotextile, interim
Three-dimensional geogrid, geotechnical grid and rubble；Then successively it is laid with first layer nonwoven soil from the bottom to top at the top of grid broken stone pile
Work cloth, sealing film, second layer non-woven geotextile and flexible drain pipe, and arranged between first layer non-woven geotextile and sealing film
Chimney filter；Then layering is laid with the second three-dimensional geogrid and waste tire aggregate-calcareous sand above second layer non-woven geotextile
Mixture constructs uncured mixture-grid reinforcement cushion, and at the top of uncured mixture-grid reinforcement cushion by
Under carry out piling prepressing after supreme placement of flexible Grouting Pipe and third layer non-woven geotextile, the piling prepressing period is not less than 3 months,
Railway embankment after piling prepressing unloading, and bacterium solution and nutrient solution are periodically injected by flexible grout pipe, while passing through flexible drain
Pipe extracts waste liquid, until stopping slip casting after uncured mixture-grid reinforcement cushion reaches predetermined solidification intensity, obtaining
Biological cement-grid reinforcement cushion；
Step 5: embankment protection layer and green layer construction:
After the completion of step 4, it is laid with one layer of waterproofing geomembrane in side slope of embankment and top surface, is then poured on waterproofing geomembrane
Biological cement mortar is built, and spraying nutrient solution makes biological cement mortar be formed by curing biological waterproof layer；Then at side slope of embankment
Biological waterproof layer upper surface be laid with cultivation soil layer, and plant slope-protecting vegetation carry out ecological slope protection；At the side slope slope foot of embankment
Gutter is set, by first layer non-woven geotextile, second layer non-woven geotextile and third layer non-woven geotextile and sealing film sealing
Ramming the bottom for filling out clay sealing ditch.
Further, in step 3, the intermittent vibration pipe-drawing is stopping vibration after rubble dispensing, vibratory compaction, and with
Pile pipe is extracted certain distance along pile body length direction by predetermined speed, and then repeatedly rubble is launched, vibrated, tube drawing operates, until
Pile pipe is pulled out to ground.
Further, in step 5, the molar concentration of the nutrient solution is 1.0mol/L, between the spray time of nutrient solution
It is divided into for 24 hours, spray age is not less than 7 days.
Further, the nutrient solution is the mixed liquor of urea and calcium chloride, and the molar concentration rate of urea and calcium chloride is
1:1。
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial to effect
Fruit:
1, road structure of the invention uses the Double-Direction Composite Ground operating mode of " pile foundation+reinforcement cushion ", and combines heap
It carries prestressing technology and microorganism curing technology handles reinforcement cushion, " granular media " reinforcement cushion is promoted first to blow silt with deficient consolidation
Ground occurs to coordinate predeformation, and then the reinforcement cushion of predeformation is processed into some strength using microorganism curing technology
With " semi-rigid " bed course of rigidity, preferable load transport system is constituted, reduces the bearing capacity of weak soil between stake, strengthens roadbed
Structural bearing performance improves its ability for controlling post-construction deformation；
2, the present invention uses " grid broken stone pile+sand reinforcement cushion " and is aided with the operating mode of plastic draining board, and building is owed
Consolidation blows vertical-horizontal drainage system of alluvial plain base, with meets owe to consolidate blow alluvial plain base work after long period consolidation draining the needs of.
The process not only enables waste and scrap to recycle, but also environmentally harmful substance will not be generated in microbial process, symbol
Close green, economic, environmental protection feature.
3, the side slope of embankment ecological waterproof protective layer in road structure of the present invention is processed into based on microorganism curing technology
Biological waterproof layer, while slope-protecting vegetation, the hydrolysis in microorganism solidification process can be planted by being laid with cultivation soil layer on it
Product can provide nitrogen source abundant for the slope-protecting vegetation of plantation, realize heat recovery.
4, method of the invention handles reinforcement cushion using waste tire aggregate, and part substitutes sandstone filler, both effectively subtracted
Lack " black " pollution and floor space caused by waste tire, realizes waste and scrap resource utilization, while also effectively
Sandstone material resource scarcity is alleviated, while granular media reinforcement cushion is handled using microorganism curing technology, green economy is environmentally friendly, with
The theory of construction economy type society, China is mutually agreed with.
5, road structure provided by the invention has a good vertical and horizontal drainage system, embankment can quickly, have
Effect be transferred to pile body, can satisfy owe consolidation blow alluvial plain base later period consolidation draining demand and effectively control embankment post-construction deformation,
Improve its stability.
6, it is provided by the invention be suitable for owing consolidation blow road structure on the base of alluvial plain have structurally reasonable, bearing capacity is high,
Short construction period and advantages of environment protection are a kind of green ecological structures being worthy to be popularized.
Detailed description of the invention
Fig. 1 is that a kind of consolidation of owing disclosed in this invention blows the reinforcing road bed schematic diagram of biological cement on the base of alluvial plain；
Fig. 2 is biological cement-grid reinforcement cushion diagrammatic cross-section of the present invention；
Fig. 3 is side slope of embankment ecological waterproof protective layer schematic diagram of the present invention；
Fig. 4 is grid broken stone pile schematic diagram of the present invention；
Fig. 5 is that grid broken stone pile of the present invention and biological cement-grid reinforcement cushion overlap schematic diagram.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
Crouch supporting course under 1-；2- blows alluvial plain base；3- embankment；4- biology cement-grid reinforcement cushion；5- grid broken stone pile；
The vertical plastic draining board of 6-；7- seals film；8- non-woven geotextile；9- rammer fills out clay sealing ditch；10- three-dimensional geogrid；11- is soft
Property Grouting Pipe；12- flexibility drain pipe；13- biology waterproof layer；14- waterproofing geomembrane；15- cultivates soil layer；16- slope-protecting vegetation；
The gutter 17-；18- grid-non-woven geotextile casing；19- Plastic Bandage.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
It is reinforcing road bed that the deficient consolidation of one kind blows biological cement on the base of alluvial plain, as shown in Figure 1, including lower sleeping supporting course 1, owing to consolidate
Alluvial plain base 2, embankment 3, biological waterproof layer 13, cultivation soil layer 15, slope-protecting vegetation 16 are blown, and blows silt in embankment 3 and deficient consolidation
Between ground 2, punch the Embankment Subsidence control structure for owing sleeping supporting course 1 under consolidation is blown alluvial plain base 2 and is embedded in；
The Embankment Subsidence control structure includes that biological cement-grid reinforcement cushion 4, multiple grid broken stone piles 5 form
Stake group pattern, vertical plastic draining board 6, sealing film 7, the first non-woven geotextile 8 and rammer fill out clay sealing ditch 9；The biology
Cement-grid reinforcement cushion 4, which is laid on grid broken stone pile 5 and owes consolidation, blows 2 upper surface of alluvial plain base；The plastic draining board 6 is inserted
Enter to owe consolidation and blows alluvial plain base 2 at away from lower sleeping supporting course preset distance；The edge of the sealing film 7 and the first non-woven geotextile 8
It is sealed in rammer and fills out clay sealing 9 bottom of ditch；The embankment 3 is filled in biological cement -4 upper surface of grid reinforcement cushion；The life
Object waterproof layer 13 is laid on 14 upper surface of 3 top surface of embankment and side waterproofing geomembrane；The cultivation soil layer 15 is laid on 3 side of embankment
It looks unfamiliar 13 upper surface of object waterproof layer；The slope-protecting vegetation 16 is planted in cultivation soil layer 15.
Referring to Fig. 1 and Fig. 2, it is by dredging silt hydraulic reclamation to predetermined absolute altitude that deficient consolidation of the present invention, which blows alluvial plain base 2,
It is formed, and the first non-woven geotextile 8 includes first layer non-woven geotextile 81 and second layer non-woven geotextile 82；The deficient consolidation is blown
Base 2 upper surface in alluvial plain is successively laid with first layer non-woven geotextile 81, sealing film 7 and second layer non-woven geotextile 82 from the bottom to top；
Criss-cross chimney filter is laid between the first layer non-woven geotextile 81 and sealing film 7, constructs to owe to consolidate and blows alluvial plain base 2
Horizontal drainage system.
Referring to fig. 2, biological cement-grid reinforcement cushion 4 of the present invention include three-dimensional geogrid 10, it is waste and old
Tire aggregate-calcareous sand mixture, flexible grout pipe 11, flexible drain pipe 12 and biological cement；The three-dimensional geogrid 10
In through-thickness layered arrangement layer 2-3 in biological cement-grid reinforcement cushion 4；The mixture is filled in each layer three-dimensional soil
Between work grid 10, mixture-grid reinforcement cushion, compactness 30-50% are constituted；The flexible grout pipe 11 is arranged in mixed
Material-grid reinforcement cushion upper surface is closed, for injecting urease-producing bacterium and nutrient solution into mixture-grid reinforcement cushion；It is described
Flexible drain pipe 12 is arranged in mixture-grid reinforcement cushion lower surface, for urease-producing bacterium metabolic waste liquid to be discharged；Institute
It states biological cement and carries out metabolism induction generation using nutrient solution by urease-producing bacterium；The nutrient solution is molar concentration
The urea and calcium chloride mixed liquor of 1.0mol/L, urea and calcium chloride molar concentration rate are 1:1.
Referring to fig. 2, flexible grout pipe 11 of the present invention and flexible drain pipe 12 are flexible plastic pipe, and diameter is
30-50mm；The flexible grout pipe 11 is equipped with equally distributed small sircle hole, one layer of outside package with flexible 12 tube wall of drain pipe
Third non-woven geotextile, end are connected with grouting pump and positive displacement pump respectively；Waste tire aggregate-calcareous sand the mixture is by giving up
Old tire particle, tyre strip and calcareous sand are sufficiently mixed, and waste tyre particle mass content controls in 5 ± 0.5% ranges, are given up
Old tire mass content controls in 10 ± 0.5% ranges；The waste tyre particle maximum particle diameter is no more than 3mm, tire
Width 15-20mm, length 40-50mm；The calcareous sand maximum particle diameter is no more than 3mm.
Referring to Fig. 3, biology waterproof layer 13 of the present invention is by per for 24 hours to being laid on the top of embankment 3 and side
On biological cement mortar spray molar concentration be 1.0mol/L nutrient solution be formed by curing, spray age be 7 days；The biology
Cement mortar is to be mixed to prepare by biological mud and medium coarse sand 1:10 in mass ratio；The laying of the biology cement mortar
With a thickness of 10-15cm；The biological mud is that the nutrient solution for being 0.5mol/L by isometric urease-producing bacterium and molar concentration mixes
Stirring 1.0h is closed, then filters out supernatant acquisition after standing deposition 0.5h；The partial size of the medium coarse sand is 0.5-2.0mm.The battalion
Nutrient solution is urea and calcium chloride mixed liquor, and urea and calcium chloride molar concentration rate are 1:1.
Referring to fig. 4,5, grid broken stone pile 5 of the present invention is by circumferential three-dimensional geogrid-non-woven geotextile set
Pipe 18 and unweathered rubble of rolling are constituted；The grid broken stone pile 5 is by rectangular, rectangle or quincunx array arrangement, spacing
2.0-3.0m；The grid-non-woven geotextile casing 18 is by the first three-dimensional geogrid and the second non-woven geotextile, using modeling
Material band 19 radially carries out interval binding along pile body length direction and pile body and is formed, and top is by the 4th nothing after filling rolls rubble
Geotextiles 84 are spun to seal；The three-dimensional geogrid meets tensile strength when elongation is 0.5% not less than 300kN/m, and three
It is 15-25mm to the mesh size of TGXG；The rubble is natural grading, and clay content is not more than 5%, and maximum particle diameter is little
In 4cm.
It blows the construction method that biological cement is reinforcing road bed on the base of alluvial plain to above-mentioned deficient consolidation below to be introduced, the present invention is excellent
The construction method of choosing the following steps are included:
Step 1: blowing-filling sludge foundation construction: on lower sleeping supporting course 1, using conventional hydraulic reclamation technology by dredging silt hydraulic reclamation
To target absolute altitude, blowing-filling sludge ground 2 is formed, and natural drying to undrained shear strength reaches 100kPa；
Step 2: building temporary working platform: after the completion of step 1, being laid with respectively from the bottom to top blowing 2 surface of alluvial plain base
One layer of bamboo fragrant plant, interim non-woven geotextile and interim three-dimensional geogrid, and slotting length is applied using artificial or semi-artificial semi-machine mode
Degree is the vertical plastic draining board of 1m, after being carried out discharging consolidation 3 months by piling prepressing, on interim three-dimensional geogrid upper berth
If one layer of geotechnical grid simultaneously fills rubble, temporary working platform is constructed, then determines the stake position of grid broken stone pile 5；
Step 3: grid broken stone pile 5 is constructed: after the completion of step 2, carrying out including that stake holes, vibration hammer decentralization stake are excavated in stake position
Grid-non-woven geotextile casing 18 is transferred in pipe to predetermined depth, pile pipe, rubble, intermittent vibration pipe-drawing are launched in casing 18
To ground pile；
The grid-non-woven geotextile casing 18 is radial along pile body length direction and pile body using Plastic Bandage 19, by the
One three-dimensional geogrid and the second non-woven geotextile carry out interval binding；The intermittent vibration pipe-drawing is that rubble is launched, vibrated
Stop vibration after closely knit, and pipe is extracted into certain distance along pile body length direction at a predetermined velocity, then repeatedly rubble is launched, shakes
The operation such as dynamic, tube drawing, until pile pipe is pulled out to ground.It specifically, such as can be according to the speed of 1m/min, along pile body length direction
Every tube drawing stops tube drawing up to 50cm, continues to repeat above-mentioned dispensing rubble, vibration, tube drawing process after vibrating 20s, until pile pipe
It pulls out to ground.
Step 4: biological cement-construction of grid reinforcement cushion 4 and embankment 3 fill: after the completion of step 3, recycling bamboo fragrant plant faces
When the temporary working platforms such as non-woven geotextile, interim three-dimensional geogrid, geotechnical grid and rubble building material, then in lattice
5 top of grid broken stone pile is successively laid with first layer non-woven geotextile 81, sealing film 7,82 and of second layer non-woven geotextile from the bottom to top
Flexible drain pipe 12, and chimney filter is arranged between first layer non-woven geotextile 81 and sealing film 7；Then in second layer nonwoven geotechnique
Layering is laid with three-dimensional geogrid 10 and waste tire aggregate-calcareous sand mixture above cloth 82, and every layer with a thickness of 100mm, structure
Uncured mixture-grid reinforcement cushion is built, and is arranged from the bottom to top at the top of uncured mixture-grid reinforcement cushion
It is carried out piling prepressing 3 months after flexible grout pipe 11 and third layer non-woven geotextile 83, piling prepressing unloads laggard walking along the street dike 3
It fills, and bacterium solution and nutrient solution is periodically injected by flexible grout pipe 11, while waste liquid is extracted by flexible drain pipe 12, reach
To after predetermined solidification intensity, stop slip casting；Wherein, rate when spraying bacterium solution is 5ml/min, continuous sprinkling 6 hours, Zhi Houjing
It sets 4 hours；Rate when spraying nutrient solution is 10ml/min, concentration 1mol/L, and continuous sprinkling 8 hours, interval is followed for 24 hours
Ring spray spills nutrient solution, and coprocessing 7-10 days.
Step 5: embankment protection layer and green layer construction: after the completion of step 4,3 side slope of embankment and top surface are laid with one layer and prevent
Water geomembrane 14, and after-pouring Biological water cement mortar, and spraying nutrient solution makes it be formed by curing biological waterproof layer 13；Then on road
13 upper surface of biological waterproof layer of 3 side slope of dike is laid with cultivation soil layer 15, and plants slope-protecting vegetation 16 and carry out ecological slope protection；On road
Gutter 17 is set at dike side slope slope foot, by first layer non-woven geotextile 81, second layer non-woven geotextile 82 and third layer nonwoven
Geotextiles 83 and sealing film 7 are sealed in the bottom rammed and fill out clay sealing ditch 9.
In general, the reinforcing road bed structure of biological cement of the invention and its construction method are to blow alluvial plain base based on deficient consolidation
What the problem that the middle consolidation draining period is long and post-construction deformation is big proposed.The present invention makes granular media reinforcement by using piling prepressing technology
Bed course generates predeformation, completes to owe the primary consolidation sedimentation that consolidation blows alluvial plain base, is later added granular media using microorganism curing technology
Muscle bed course is processed into " plate " structure with some strength and rigidity, more loads can not only be transferred to pile body, more preferably
Ground controls embankment post-construction deformation, but also lateral and vertical bidirectional drainage system can be constituted with grid broken stone pile, can satisfy
It is deficient to consolidate the demand for blowing alluvial plain base later period consolidation draining.Meanwhile waste tire bone is mixed in biological cement-grid reinforcement cushion
Material, instead of part sandstone dosage, realizes waste and scrap resource utilization, alleviates sandstone material situation in short supply, have
Economic and environment-friendly advantage.
The present invention uses the side slope of embankment ecological waterproof protective layer of microorganism curing technology setting, and preferable permeability has
Help at storm seepage to side slope sough, while the hydrolysate in microorganism solidification process can plant for the green of plantation
Object provides nitrogen source abundant, realizes heat recovery.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. it is reinforcing road bed that the deficient consolidation of one kind blows biological cement on the base of alluvial plain characterized by comprising lower sleeping supporting course (1) owes solid
Knot blows alluvial plain base (2), embankment (3), biological waterproof layer (13), cultivation soil layer (15), slope-protecting vegetation (16), and is in embankment
(3) it blows between alluvial plain base (2) with deficient consolidation, punch the Embankment Subsidence for owing sleeping supporting course (1) under consolidation is blown alluvial plain base (2) and is embedded in
Control structure；
The Embankment Subsidence control structure includes biological cement-grid reinforcement cushion (4), multiple grid broken stone piles (5) composition
Stake group pattern, vertical plastic draining board (6), sealing film (7), the first non-woven geotextile (8) and rammer fill out clay sealing ditch (9)；
Biology cement-grid the reinforcement cushion (4), which is laid on grid broken stone pile (5) and owes consolidation, blows alluvial plain base (2) upper surface；It is described
Plastic draining board (6) insertion owes consolidation and blows alluvial plain base (2) at away from lower sleeping supporting course (1) preset distance；The sealing film (7) sets
In the interlayer of the first non-woven geotextile (8)；First non-woven geotextile (8) be set to consolidation blow alluvial plain base (2) upper surface with
Between biological cement-grid reinforcement cushion (4) lower surface；The edge seal of sealing film (7) and the first non-woven geotextile (8)
Clay sealing ditch (9) bottom is filled out in rammer；
The embankment (3) is filled in biological cement-grid reinforcement cushion (4) upper surface；The biology waterproof layer (13) is laid on
Embankment (3) top surface and side waterproofing geomembrane (14) upper surface；It is anti-that the cultivation soil layer (15) is laid on embankment (3) side biology
Water layer (13) upper surface；The slope-protecting vegetation (16) is planted in cultivation soil layer (15).
2. it is reinforcing road bed that deficient consolidation according to claim 1 blows biological cement on the base of alluvial plain, which is characterized in that described to owe solid
Knot, which blows alluvial plain base (2), to be formed by dredging silt hydraulic reclamation to predetermined absolute altitude, and after natural drying to predetermined undrained shear strength；
The interlayer that first non-woven geotextile (8) is made of first layer non-woven geotextile (81) and second layer non-woven geotextile (82)
Construction；The deficient consolidation blows alluvial plain base (2) upper surface and is successively laid with first layer non-woven geotextile (81), sealing film from the bottom to top
(7) and second layer non-woven geotextile (82)；It is laid between the first layer non-woven geotextile (81) and sealing film (7) criss-cross
Chimney filter, construct and owe consolidation and blow the horizontal drainage system of alluvial plain base (2).
3. it is reinforcing road bed that deficient consolidation according to claim 1 or 2 blows biological cement on the base of alluvial plain, which is characterized in that described
Grid broken stone pile (5) is made of circumferential three-dimensional geogrid-non-woven geotextile casing (18) and unweathered rubble of rolling；Institute
Grid broken stone pile (5) is stated by rectangular, rectangle or quincuncial arrangement, spacing 2.0-3.0m；The three-dimensional geogrid-nonwoven geotechnique
Cloth casing (18) is between radially being carried out by the first three-dimensional geogrid and the second non-woven geotextile along pile body length direction and pile body
It is formed every binding；The tensile strength that first three-dimensional geogrid meets when elongation is 0.5% is not less than 300kN/m, the
The mesh size of one three-dimensional geogrid is 15-25mm；The rubble of rolling is natural grading, and clay content is not more than 5%, maximum
Partial size is not more than 4cm.
4. deficient consolidation according to any one of claims 1 to 3 is blown on the base of alluvial plain, biological cement is reinforcing road bed, and feature exists
In the biology cement-grid reinforcement cushion (4) is mixed including the second three-dimensional geogrid (10), waste tire aggregate-calcareous sand
Close material, flexible grout pipe (11), flexible drain pipe (12) and biological cement；Second three-dimensional geogrid (10) is in Biological water
Mud-interior through-thickness layered arrangement the layer 2-3 of grid reinforcement cushion (4)；The mixture is filled in each the second three-dimensional of layer geotechnique
Between grid (10), mixture-grid reinforcement cushion, compactness 30-50%, table on mixture-grid reinforcement cushion are constituted
Face is equipped with third layer non-woven geotextile (83)；The flexible grout pipe (11) is arranged in the upper table of mixture-grid reinforcement cushion
Between face and third layer non-woven geotextile (83) lower surface, for into mixture-grid reinforcement cushion inject urease-producing bacterium and
Nutrient solution；The flexibility drain pipe (12) is arranged in mixture-grid reinforcement cushion lower surface and second layer non-woven geotextile
(82) between upper surface, for urease-producing bacterium metabolic waste liquid to be discharged；The biology cement is that urease-producing bacterium utilizes nutrition
Liquid carries out the product of metabolism.
5. deficient consolidation described in any one blows on the base of alluvial plain that biological cement is reinforcing road bed, and feature exists according to claim 1~4
In the flexible grout pipe (11) and flexible drain pipe (12) are flexible plastic pipe, diameter 30-50mm；The flexible note
Slurry pipe (11) and flexible drain pipe (12) tube wall are equipped with equally distributed small sircle hole, one layer of third nonwoven geotechnique of external each package
Cloth, end are connected with grouting pump and positive displacement pump respectively；Waste tire aggregate-calcareous sand the mixture by waste tyre particle,
Tyre strip is sufficiently mixed with calcareous sand, and waste tyre particle mass content is 5 ± 0.5%, and waste tire mass content is 10
± 0.5%；The waste tyre particle maximum particle diameter is no more than 3mm, tyre strip width 15-20mm, length 40-50mm；It is described
Calcareous sand maximum particle diameter is no more than 3mm.
6. deficient consolidation described in any one blows on the base of alluvial plain that biological cement is reinforcing road bed, and feature exists according to claim 1~5
In the biology waterproof layer (13) is by the biological cement mortar spraying nutrient solution solidification on embankment (3) top and side
It is formed；The biology cement mortar is biological mud and the mixed uniformly product of medium coarse sand 1:10 in mass ratio；The biology mud
1.0h is mixed by the nutrient solution of isometric urease-producing bacterium and molar concentration 0.5mol/L in slurry, then filters after standing deposition 0.5h
Except supernatant obtains, the nutrient solution is the mixed liquor of urea and calcium chloride, and the molar concentration rate of urea and calcium chloride is 1:1；
The laying depth of the biology cement mortar is 10-15cm；The partial size of the medium coarse sand is 0.5-2.0mm.
7. a kind of deficient consolidation as described in claim 1~6 any one blows the construction that biological cement is reinforcing road bed on the base of alluvial plain
Method, which comprises the following steps:
Step 1: blowing-filling sludge foundation construction:
On lower sleeping supporting course (1), using conventional hydraulic reclamation technology by dredging silt hydraulic reclamation to target absolute altitude, alluvial plain base is blown in formation
(2), and natural drying to undrained shear strength is not less than 50kPa；
Step 2: it builds temporary working platform:
After the completion of step 1, bamboo fragrant plant, interim non-woven geotextile and interim are laid with respectively from the bottom to top blowing alluvial plain base (2) surface
Then three-dimensional geogrid is applied and inserts vertical plastic draining board (6), carry out discharging consolidation, discharging consolidation period by piling prepressing
Not less than 3 months, then on interim three-dimensional geogrid be laid with one layer of geotechnical grid and fill rubble building temporary working platform,
And determine the stake position of grid broken stone pile (5)；
Step 3: grid broken stone pile (5) construction:
After the completion of step 2, stake position excavation stake holes is successively carried out, vibration hammer transfers in pile pipe to predetermined depth, pile pipe and transfers three
Rubble, interval are launched into TGXG-non-woven geotextile casing (18), three-dimensional geogrid-non-woven geotextile casing (18)
Formula vibration pipe-drawing is to ground pile step；
Step 4: biological cement-grid reinforcement cushion (4) construction and embankment (3) fill:
After the completion of step 3, the building material of temporary working platform, including bamboo fragrant plant, interim non-woven geotextile, interim three-dimensional are recycled
TGXG, geotechnical grid and rubble；Then successively it is laid with first layer nonwoven geotechnique from the bottom to top at the top of grid broken stone pile (5)
Cloth (81), sealing film (7), second layer non-woven geotextile (82) and flexible drain pipe (12), and in first layer non-woven geotextile
(81) chimney filter is arranged between sealing film (7)；Then layering is laid with the second three-dimensional soil above second layer non-woven geotextile (82)
Work grid (10) and waste tire aggregate-calcareous sand mixture, construct uncured mixture-grid reinforcement cushion, and not
Placement of flexible Grouting Pipe (11) and third layer non-woven geotextile (83) from the bottom to top at the top of cured mixture-grid reinforcement cushion
After carry out piling prepressing, the piling prepressing period is not less than 3 months, railway embankment (3) after piling prepressing unloading, and passes through flexible note
Slurry pipe (11) periodically injects bacterium solution and nutrient solution, while extracting waste liquid by flexible drain pipe (12), until uncured mix
After conjunction material-grid reinforcement cushion reaches predetermined solidification intensity, stops slip casting, obtain biological cement-grid reinforcement cushion (4)；
Step 5: embankment protection layer and green layer construction:
After the completion of step 4, it is laid with one layer of waterproofing geomembrane (14) in embankment (3) side slope and top surface, then in waterproofing geomembrane
(14) biological cement mortar is poured on, and spraying nutrient solution makes biological cement mortar be formed by curing biological waterproof layer (13)；Then
Biological waterproof layer (13) upper surface at embankment (3) side slope is laid with cultivation soil layer (15), and plants slope-protecting vegetation (16) progress
Ecological slope protection；At the side slope slope foot of embankment (3) be arranged gutter (17), by first layer non-woven geotextile (81), the second layer without
It spins geotextiles (82) and third layer non-woven geotextile (83) and sealing film (7) is sealed in the bottom that rammer fills out clay sealing ditch (9).
8. construction method according to claim 7, which is characterized in that in step 3, the intermittent vibration pipe-drawing is rubble
It launches, stop vibration after vibratory compaction, and pile pipe is extracted into certain distance along pile body length direction at a predetermined velocity, then repeat
Rubble is launched, is vibrated, tube drawing operates, until pile pipe is pulled out to ground.
9. construction method according to claim 7 or 8, which is characterized in that in step 5, the nutrient solution it is mole dense
Degree is 1.0mol/L, is divided between the spray time of nutrient solution for 24 hours, spray age is not less than 7 days.
10. according to construction method described in claim 7~9 any one, which is characterized in that the nutrient solution is urea and chlorine
The molar concentration rate of the mixed liquor of change calcium, urea and calcium chloride is 1:1.
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