CN106223348A - A kind of microorganism GSZ associating reinforcement method - Google Patents

A kind of microorganism GSZ associating reinforcement method Download PDF

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Publication number
CN106223348A
CN106223348A CN201610567494.0A CN201610567494A CN106223348A CN 106223348 A CN106223348 A CN 106223348A CN 201610567494 A CN201610567494 A CN 201610567494A CN 106223348 A CN106223348 A CN 106223348A
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gsz
microorganism
associating
retaining wall
reinforcement method
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CN106223348B (en
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高玉峰
王丽亚
张飞
何嫁
杨尚川
顾张翔
杭磊
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Hohai University HHU
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/18—Making embankments, e.g. dikes, dams
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0084—Geogrids

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)

Abstract

The invention provides a kind of microorganism GSZ associating reinforcement method, on the basis of original geogrid reinforced retaining wall, utilize " biological cement " technology, strengthen the rubbing action that GSZ bankets with surrounding, reduce the drawing rib length needed, improve lacing wire withdrawal resistance.The microbial reaction process that the present invention relies on is nature, the process that especially in the ecological environment of the soil body, itself exists, compare in Geotechnical Engineering frequently with the method such as grouting, effect on environment of the present invention is much smaller；The microorganism GSZ associating reinforcement method that the present invention uses, compares traditional retaining wall, is provided that bigger withdrawal resistance, it is ensured that the performance that lacing wire acts in retaining wall, improve the safety of reinforced earth retaining wall；The present invention constructs simply, and the construction time is short, GSZ and microorganism reinforcing process is combined, i.e. economy environmental protection again.

Description

A kind of microorganism-GSZ associating reinforcement method
Technical field
The invention belongs to field of civil engineering, relate to a kind of bank protection processing method, be specifically related to a kind of microorganism-geotechnique's lattice Grid associating reinforcement method.
Background technology
For reinforced earth retaining wall, at slip-crack surface during slope instability, pulling force is mainly born by lacing wire, side slope slip-crack surface with The soil body between shingle nail has the trend that lacing wire is extracted the soil body, if between drawing rib length deficiency or lacing wire and surrounding soil Rubbing action the least, it may appear that the failure mode that lacing wire is pulled out.In order to ensure the resistance to plucking stability of reinforced earth retaining wall, need Calculating drawing rib length, utilize traditional method for designing to calculate, the wall that drawing rib length is generally 0.5～0.7 is high, but in some feelings Under condition, it is necessary to build retaining wall in limited space.Such as can there is some excavation slopes, side slope in natural mountain terrain While being the building fixed, another side is highway or park or other buildings, in order to save a cubic metre of earth cost, this kind of side slope The gradient is generally large and width is little, is suitable for using the form of reinforced earth retaining wall.But, its width is usually unsatisfactory for designing needs Drawing rib length, what lacing wire often occurred extracts destruction.For another example, along with the propelling of Development of China's Urbanization, the volume of traffic is greatly increased, a lot Existing highway needs to carry out widening process could meet transport need.Conventional way be exactly at the body of wall originally built or Fill the soil body before person's embankment and build retaining wall.The embankment widened all is made up of the outside soil body, and the earth volume of needs is very big, examines Consider and arrive transport and construction cost and the surrounding buildings restriction to embankment, it is necessary in limited space, prune side slope of embankment.
The reinforced earth retaining wall built in above-mentioned two situations is referred to as " narrow wall ".For " narrow wall ", the length of its lacing wire Degree can not meet traditional calculating requirement, easily extracts destruction if do not processed.So extracting destruction for lacing wire, having must Propose a kind of new method, strengthen the rubbing action between lacing wire and soil, improve the withdrawal resistance of lacing wire, to ensure lacing wire effect Performance.
From the point of view of determining in terms of drawing rib length, the rubbing action between itself and lacing wire to surrounding soil is relevant, if The rubbing action between lacing wire and surrounding soil can be improved and just can effectively increase the resistance to plucking stability of reinforced earth retaining wall.Cause This, design one and can improve frictional force between surrounding soil, retaining wall is played reinforcing, the scheme of Stabilization very must Want.
Summary of the invention
Solve the technical problem that: in order to overcome lacing wire in prior art and frictional force between the soil body is little about, lacing wire The defect that lacing wire withdrawal resistance that length is unreasonable etc. causes is weak, " narrow into the reinforced earth of the coarse-grained soils such as sand for banketing behind Wall ", the invention provides a kind of microorganism-GSZ associating reinforcement method, at original geogrid reinforced retaining wall On the basis of, utilize " biological cement " technology, strengthen the rubbing action that GSZ bankets with surrounding, reduce the lacing wire needed long Degree, improves lacing wire withdrawal resistance.
Technical scheme:
A kind of microorganism-GSZ associating reinforcement method, comprises the steps of
1st step: treating reinforcing side slope edge or intending newly-built retaining wall position level one layer of GSZ of laying；
2nd step: backfill one layer of sand, thickness is 3～5 centimetres, sprays microorganism suspension, and described microorganism is Pasteur's bud Spore bacillus, turbid liquid concentration is 108-109cell/mL；Spray the CaCl of 0.05-0.2mol/L subsequently2Weak solution；
3rd step: spray consolidation process liquid on sandy soils, wait 5 minutes～6 hours, then spray a consolidation process liquid； Described consolidation process liquid is carbamide and CaCl2Mixed solution, the concentration of carbamide is 0.75mol/L-1.0mol/L, carbamide with CaCl2Concentration than for 1:1-1:2, the two volume ratio is 1:1；
4th step: one layer of sand of backfill again, to sand engineered fill height, it is thus achieved that reinforce band, is formed and widens reinforcing body；
5th step: repeat the 1st step～the 4th step, to the design height of retaining wall.
Preferably, in the 2nd step, in the range of the end 1/4-1/2 of GSZ, spray microorganism suspension.
Preferably, described in the 2nd step, microorganism concn is 109cell/mL。
Preferably, CaCl described in the 2nd step2The concentration of solution is 0.1mol/L.
Preferably, the 3rd step is sprayed on sandy soils consolidation process liquid, after 30 minutes, then sprays a consolidation process liquid； Described consolidation process liquid is 0.75mol/L carbamide and 1.5mol/LCaCl2Mixed solution, the two volume ratio is 1:1.
Preferably, the reinforcing band in described method comprises microbial cells, the preferred Bacillus pasteurii of described thalline.
Beneficial effect: the microbial reaction process that (1) present invention relies on is nature, especially in the ecological environment of the soil body The process that itself exists, compare in Geotechnical Engineering frequently with the method such as grouting, effect on environment of the present invention is much smaller；(2) originally The microorganism that invention uses-GSZ associating reinforcement method, compares traditional retaining wall, is provided that bigger withdrawal resistance, protect Demonstrate,prove the performance that lacing wire acts in retaining wall, improve the safety of reinforced earth retaining wall；(3) at original Fill Reinforced With Geogrids On the basis of soil retaining wall, the present invention utilizes " biological cement " technology, strengthens the rubbing action that GSZ bankets with surrounding, subtracts Few drawing rib length needed, improves lacing wire withdrawal resistance；(4) present invention constructs simply, and the construction time is short, by GSZ and microorganism Reinforcing process combines, i.e. economy environmental protection again.
Accompanying drawing explanation
Fig. 1 is microorganism-GSZ associating reinforcement test model figure；
Fig. 2 is highway widening microorganism-GSZ associating reinforced soil retaining wall structural representation；
Fig. 3 is mountain ridge excavation slope microorganism-GSZ associating reinforced soil retaining wall structural representation；
Fig. 4 is microorganism-GSZ associating friction-type reinforced soil retaining wall structural representation；
Wherein, 1 is GSZ, and 2 for reinforcing band, and 3 for widening reinforcing body, and A end is that withdrawal force applies end, and B end is model Free end.
Detailed description of the invention
Following example further illustrate present disclosure, but should not be construed as limitation of the present invention.Without departing substantially from In the case of present invention spirit and essence, the amendment that the inventive method, step or condition are made and replacement, belong to the present invention Scope.If not specializing, the conventional means that technological means used in embodiment is well known to those skilled in the art.
Embodiment 1
In order to check microbial process to the withdrawal resistance of muscle material in reinforced earth bulkhead, width be 15cm, a length of 25cm, Highly for the model of 7cm has carried out the geotechnological lattice under simple GSZ and microorganism-GSZ synergy respectively Grid pull-out bond test, the sand of employing is normal sand.
Wherein, the method for microorganism-GSZ associating reinforced earth bulkhead, comprise the steps of
1st step: insert sand in model box, thickness is 3.5cm, and lays one layer of GSZ at upper horizontal；
2nd step: backfill overlying sand, thickness is 3.5cm, sprays microorganism suspension, and described microorganism is Pasteur's spore Bacillus, turbid liquid concentration is 109cell/mL；Spray the CaCl of 0.1mol/L subsequently2Weak solution；
3rd step: spray consolidation process liquid on sandy soils, wait 6 hours, then spray a consolidation process liquid；Described add Gu treatment fluid is carbamide and CaCl2Mixed solution, the concentration of carbamide is 0.75mol/L, CaCl2Concentration be 1.5mol/L；
Wherein, in the 2nd step, on GSZ, gross area sprays microorganism suspension.
Not spraying microorganism suspension in simple Geogrid Reinforced Earth Retaining Wall, remaining step is identical.
As it is shown in figure 1, GSZ prolongs the long * width horizontal layout of model, a width of 15cm, grille plane is from model bottom surface The position of 3.5cm.Model A end is the one end applying withdrawal force, and B end is the other end, i.e. free end.At GSZ withdrawal process In, if the area of GSZ is model box floor space, the lifting surface area of GSZ can be caused to reduce, impact practice knot Really.Completely carrying out for guarantee test, GSZ total length is 40cm, and GSZ one end highlights Model B end 10cm, to protect Card GSZ lifting surface area is unaffected, and the other end highlights model A end 5cm, to facilitate the clamping of withdrawal force implementation tool.
Result shows, the not GSZ withdrawal resistance through microorganism consolidation process that test obtains is 26.7N, passes through The withdrawal resistance that microorganism consolidation process is twice is 287.6N, it can be seen that microorganism-GSZ combination method can improve geotechnique's lattice Grid withdrawal resistance about 10 times.
Embodiment 2
As in figure 2 it is shown, microorganism of the present invention-GSZ associating reinforced soil retaining wall is applied to highway widening, tool Body step is as follows:
1st step: lay one layer of GSZ 1 intending newly-built retaining wall position level；
2nd step: backfill one layer of sand, thickness is 3～5 centimetres, sprays in the range of GSZ end to its length 1/2 Microorganism suspension, described microorganism is Bacillus pasteurii, and turbid liquid concentration is 109cell/mL；Spray 0.1mol/L subsequently CaCl2Weak solution；
3rd step: spray consolidation process liquid on sandy soils, wait 30 minutes, then spray a consolidation process liquid；Described add Gu treatment fluid is carbamide and CaCl2Mixed solution, the concentration of carbamide is 0.75mol/L, carbamide and CaCl2Concentration be 1.5mol/L, the two volume ratio is 1:1；
4th step: one layer of sand of backfill again, to sand engineered fill height, it is thus achieved that reinforce band 2, is formed and widens reinforcing body 3；
5th step: repeat the 1st step～the 4th step, to the design height of retaining wall.
Embodiment 3
As shown in Figure 3,4, microorganism of the present invention-GSZ associating reinforced soil retaining wall is used for excavation limit, the mountain ridge Slope.
1st step: lay one layer of GSZ 1 in ridge, Gushan Mountain to be added excavation slope marginal position level；
2nd step: backfill one layer of sand, thickness is 3～5 centimetres, sprays microorganism and hang in the range of GSZ end 1/3 Turbid liquid, described microorganism is Bacillus pasteurii, and turbid liquid concentration is 109cell/mL；Spray the CaCl of 0.1mol/L subsequently2Dilute Solution；
3rd step: spray consolidation process liquid on sandy soils, wait 30 minutes, then spray a consolidation process liquid；Described add Gu treatment fluid is carbamide and CaCl2Mixed solution, the concentration of carbamide is 0.75mol/L, carbamide and CaCl2Concentration be 1.5mol/L, the two volume ratio is 1:1；
4th step: one layer of sand of backfill again, to sand engineered fill height, it is thus achieved that reinforce band 2, is formed and widens reinforcing body 3；5th step: repeat the 1st step～the 4th step, to the design height of retaining wall.Embodiment 4 microorganisms-GSZ associating friction-type Reinforced soil retaining wall
In reinforced earth retaining wall work progress, there are two kinds of processing modes, a kind of employing when processing panel and reinforcing body Anchoring pieces etc. carry out mechanical linkages to both, and another kind is not process the two, utilizes rubbing between reinforcing body and panel Wiping power makes the two to interact.The reinforcing body stress in the one end connected with panel is bigger, so at for the second Reason mode, uses microorganism cement technology, reinforces reinforcing body and the panel attached portion i.e. front end of GSZ, can be effective Improve the stressing conditions of GSZ, increase its breakout capacity.It is embodied as step identical with 3 with embodiment 2, the most right GSZ is connected end and carries out microorganism suspension and the sprinkling of consolidation process liquid to the 1/4 of GSZ with panel Operation.
Visible by embodiment 2～4, microorganism of the present invention-GSZ associating reinforced soil retaining wall, open up at highway Wide, mountain ridge excavation slope is reinforced and all can be played the effect improving GSZ withdrawal resistance.Additionally, reinforcement of the present invention gear When cob wall uses friction-type, it is also possible to effectively improve the stressing conditions of GSZ, increase its breakout capacity.

Claims (6)

1. microorganism-GSZ associating reinforcement method, it is characterised in that comprise the steps of
1st step: treating reinforcing side slope edge or intending newly-built retaining wall position level one layer of GSZ (1) of laying；
2nd step: backfill one layer of sand, thickness is 3～5 centimetres, sprays microorganism suspension, and described microorganism is Pasteur's spore bar Bacterium, turbid liquid concentration is 108-109cell/mL；Spray the CaCl of 0.05-0.2mol/L subsequently2Weak solution；
3rd step: spray consolidation process liquid on sandy soils, wait 5 minutes～6 hours, then spray a consolidation process liquid；Described Consolidation process liquid is carbamide and CaCl2Mixed solution, the concentration of carbamide is 0.75mol/L-1.0mol/L, carbamide and CaCl2's Concentration is than for 1:1-1:2, and the two volume ratio is 1:1；
4th step: one layer of sand of backfill again, to sand engineered fill height, it is thus achieved that reinforce band (2), is formed and widens reinforcing body (3)；
5th step: repeat the 1st step～the 4th step, to the design height of retaining wall.
Microorganism the most according to claim 1-GSZ associating reinforcement method, it is characterised in that in the 2nd step, at soil Microorganism suspension is sprayed in the range of the end 1/4-1/2 of work grid (1).
Microorganism the most according to claim 1-GSZ associating reinforcement method, it is characterised in that micro-described in the 2nd step Biological concentration is 109cell/mL。
Microorganism the most according to claim 1-GSZ associating reinforcement method, it is characterised in that described in the 2nd step CaCl2The concentration of solution is 0.1mol/L.
Microorganism the most according to claim 1-GSZ associating reinforcement method, it is characterised in that at sand in the 3rd step Spray consolidation process liquid on layer, after 30 minutes, then spray a consolidation process liquid；Described consolidation process liquid is 0.75mol/L urine Element and 1.5mol/LCaCl2Mixed solution, the two volume ratio is 1:1.
6. according to the arbitrary described microorganism of Claims 1 to 5-GSZ associating reinforcement method, it is characterised in that described side Reinforcing band (2) in method comprises microbial cells, the preferred Bacillus pasteurii of described thalline.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106835878A (en) * 2017-01-24 2017-06-13 华中科技大学 A kind of embankment structure and construction method
CN106968219A (en) * 2017-04-17 2017-07-21 中国农业大学 A kind of the old and new's dyke joint portion ruggedized construction and its application
CN106978795A (en) * 2017-04-17 2017-07-25 中国农业大学 A kind of Novel geogrid and its application for the old and new's dyke joint portion
CN107938480A (en) * 2017-11-01 2018-04-20 重庆大学 A kind of microorganism cures the desert highway embankment and its construction method of joint TGXG
CN109736291A (en) * 2018-12-24 2019-05-10 华中科技大学 One kind owing consolidation and blows on the base of alluvial plain that biological cement is reinforcing road bed and its construction method
CN110424449A (en) * 2019-07-16 2019-11-08 河海大学 A kind of microbe controlling method of reinforced earth bulkhead and its long-time stability
CN110770400A (en) * 2017-05-30 2020-02-07 洛桑联邦理工学院 Geotextile
CN110964533A (en) * 2018-10-01 2020-04-07 首尔大学校产学协力团 Composition for preventing soil loss by inducing precipitation of calcium carbonate using microorganism and method for preventing soil loss using same
CN112878339A (en) * 2021-01-11 2021-06-01 湘潭大学 Biological self-repairing gabion unit device for filler, preparation method and slope reinforcement method
CN115059111A (en) * 2022-05-25 2022-09-16 同济大学 Marginal backfill reinforced retaining wall and preparation method thereof

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106835878A (en) * 2017-01-24 2017-06-13 华中科技大学 A kind of embankment structure and construction method
CN106968219A (en) * 2017-04-17 2017-07-21 中国农业大学 A kind of the old and new's dyke joint portion ruggedized construction and its application
CN106978795A (en) * 2017-04-17 2017-07-25 中国农业大学 A kind of Novel geogrid and its application for the old and new's dyke joint portion
CN110770400A (en) * 2017-05-30 2020-02-07 洛桑联邦理工学院 Geotextile
CN110770400B (en) * 2017-05-30 2021-11-12 洛桑联邦理工学院 Geotextile
CN107938480A (en) * 2017-11-01 2018-04-20 重庆大学 A kind of microorganism cures the desert highway embankment and its construction method of joint TGXG
CN110964533A (en) * 2018-10-01 2020-04-07 首尔大学校产学协力团 Composition for preventing soil loss by inducing precipitation of calcium carbonate using microorganism and method for preventing soil loss using same
CN109736291A (en) * 2018-12-24 2019-05-10 华中科技大学 One kind owing consolidation and blows on the base of alluvial plain that biological cement is reinforcing road bed and its construction method
CN110424449A (en) * 2019-07-16 2019-11-08 河海大学 A kind of microbe controlling method of reinforced earth bulkhead and its long-time stability
CN110424449B (en) * 2019-07-16 2021-06-15 河海大学 Microorganism control method for long-term stability of reinforced retaining wall
CN112878339A (en) * 2021-01-11 2021-06-01 湘潭大学 Biological self-repairing gabion unit device for filler, preparation method and slope reinforcement method
CN112878339B (en) * 2021-01-11 2021-10-29 湘潭大学 Biological self-repairing gabion unit device for filler, preparation method and slope reinforcement method
CN115059111A (en) * 2022-05-25 2022-09-16 同济大学 Marginal backfill reinforced retaining wall and preparation method thereof
CN115059111B (en) * 2022-05-25 2023-09-26 同济大学 Marginal backfill reinforced retaining wall and preparation method thereof

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