CN114182763A - Barrier wall and construction method thereof - Google Patents
Barrier wall and construction method thereof Download PDFInfo
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- CN114182763A CN114182763A CN202111638983.8A CN202111638983A CN114182763A CN 114182763 A CN114182763 A CN 114182763A CN 202111638983 A CN202111638983 A CN 202111638983A CN 114182763 A CN114182763 A CN 114182763A
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- hole
- barrier wall
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- drilling
- bacterial liquid
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- 230000004888 barrier function Effects 0.000 title claims abstract description 69
- 238000010276 construction Methods 0.000 title abstract description 25
- 230000001580 bacterial effect Effects 0.000 claims abstract description 59
- 238000005553 drilling Methods 0.000 claims abstract description 57
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 239000004576 sand Substances 0.000 claims abstract description 40
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 20
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 15
- 230000035699 permeability Effects 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 5
- 239000011259 mixed solution Substances 0.000 claims description 28
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 26
- 239000000243 solution Substances 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 24
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 18
- 239000004202 carbamide Substances 0.000 claims description 18
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 17
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 17
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 13
- 238000012258 culturing Methods 0.000 claims description 13
- 241000894006 Bacteria Species 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 244000005700 microbiome Species 0.000 claims description 5
- 241000863422 Myxococcus xanthus Species 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 241000193469 Clostridium pasteurianum Species 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 2
- 238000002347 injection Methods 0.000 description 61
- 239000007924 injection Substances 0.000 description 61
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 36
- 239000003814 drug Substances 0.000 description 26
- 238000000926 separation method Methods 0.000 description 13
- 239000004568 cement Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- 239000012466 permeate Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 6
- 241000193395 Sporosarcina pasteurii Species 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 241000588986 Alcaligenes Species 0.000 description 4
- 241000589516 Pseudomonas Species 0.000 description 4
- 241000607598 Vibrio Species 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 241000193830 Bacillus <bacterium> Species 0.000 description 3
- 241000606860 Pasteurella Species 0.000 description 3
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 description 3
- 235000011092 calcium acetate Nutrition 0.000 description 3
- 239000001639 calcium acetate Substances 0.000 description 3
- 229960005147 calcium acetate Drugs 0.000 description 3
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 3
- 229940062672 calcium dihydrogen phosphate Drugs 0.000 description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 235000019691 monocalcium phosphate Nutrition 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 241001509286 Thiobacillus denitrificans Species 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 241001453369 Achromobacter denitrificans Species 0.000 description 1
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 1
- 241000589540 Pseudomonas fluorescens Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 241000605008 Spirillum Species 0.000 description 1
- 241000605118 Thiobacillus Species 0.000 description 1
- 108010046334 Urease Proteins 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000006194 liquid suspension Substances 0.000 description 1
- 238000009629 microbiological culture Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
Abstract
The invention provides a barrier wall, wherein the column body comprises a filler and a continuous, complete and compact calcium carbonate column filled in pores of the filler; the permeability coefficient of the column is 10‑9cm/s or less. The invention also provides a construction method of the barrier wall, wherein the barrier wall is the barrier wall, and the construction method comprises the following steps: drilling holes, and filling filler into the holes; slowly pouring bacterial liquid into the pores of the filler, injecting calcium ion solution and standing until the permeability coefficient of the column body is 10‑9cm/s or less; sealing the drilling hole; and circulating the steps to connect the plurality of columns to form the barrier wall. When the site is repaired and removed in the later period, the blocking wall structure can collapse only by drilling the hole and slowly injecting the acid solution, and the fine sand is pumped out by the mud pump, so that the blocking wall can be realized without secondary excavationThe partition wall is dismantled, so that the partition wall is simpler to dismantle.
Description
Technical Field
The invention relates to the field of a barrier wall, in particular to a barrier wall and a construction method thereof.
Background
With the development of social economy, the process of urbanization is continuously promoted, chemical plants, oil extraction plants, smelting plants and other industrial sites need to be moved to new low points, and a large amount of residual heavy metals and organic pollutants may remain in the residual sites. These contaminants may enter the groundwater and migrate with the water, presenting a safety risk to people in the watershed.
For the site where the pollutants are infiltrated, the barrier wall is a control measure with higher priority. The method comprises the steps of firstly, establishing a barrier wall at the periphery of a polluted area to prevent further diffusion of pollutants, and then repairing underground pollutants in a control area.
The conventional barrier wall mainly comprises a slurry wall, a cement wall, a steel sheet pile and the like. The mud wall and the cement wall achieve the barrier effect by converting the liquid suspension into a compact solid wall; the steel sheet pile realizes vertical water isolation by vertically driving a steel sheet into the ground.
When the separation wall made of the steel sheet piles is driven into the ground, the separation wall is easy to bend in a hammering process, and the connecting positions of two adjacent steel plates are staggered, so that the whole separation wall is notched, and the separation function of the separation wall cannot be realized. When the slurry wall and the cement wall are built, the used raw materials are mostly fine powdery materials, and the powdery materials are mixed into suspension liquid and then injected into the groove of the separation wall to be solidified to form the separation wall. Although the mud wall and the cement wall can effectively realize the function of separation, the mud wall and the cement wall can only be removed by digging when the field is repaired at the later stage, and the removal is very difficult.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the separation wall made of the cement wall and the slurry wall in the prior art is difficult to remove.
Therefore, the invention provides a barrier wall which is formed by connecting a plurality of columns; the column body comprises a filler and a continuous, complete and compact calcium carbonate column filled in the pores of the filler; the permeability coefficient of the column is 10-9cm/s or less.
Further, the filler is fine sand, and the particle size of the fine sand is 5-20 meshes.
Further, the calcium carbonate column is synthesized in the pores of the filler by using a calcium ion solution through microorganisms in a bacterial liquid; the microorganism in the bacterial liquid is selected from one or more of myxococcus xanthus, sulfate reducing bacteria, denitrifying bacteria and bacillus pasteurianus; the sulfate reducing bacteria comprise at least one of vibrio devulcani, spirillum devulcani and vibrio sporogenes devulcani; the denitrifying bacteria comprise at least one of thiobacillus denitrificans, pseudomonas and alcaligenes. Wherein the Pseudomonas comprises at least one of Pseudomonas aeruginosa, Pseudomonas fluorescens, Pseudomonas farci and Pseudomonas pseudolaricis; the Alcaligenes includes at least one of Alcaligenes pseudoalcaligenes, Alcaligenes denitrificans and Alcaligenes aromatica.
Further, the method for obtaining the bacterial liquid comprises the following steps:
adding 20-30g/L of corresponding strain powder, 15-20g/L of ammonium sulfate and 10-15g/L of urea into water to obtain a mixed solution, adjusting pH of the mixed solution to 6.5-9.5 with dilute sulfuric acid and ammonia water, and fermenting and culturing at 25-37 deg.C for 24-72 h.
Further, the concentration of the calcium ion solution is 0.05-0.1 mol/L.
The invention provides a construction method of a barrier wall, wherein the barrier wall is the barrier wall, and the construction method comprises the following steps:
drilling holes, and filling filler into the holes;
slowly pouring bacterial liquid into the pores of the filler, injecting calcium ion solution and standing until the permeability coefficient of the column body is 10-9cm/s or less;
sealing the drilling hole;
and circulating the steps to connect the plurality of columns to form the barrier wall.
Further, the standing time after the calcium ion solution is injected is 1 to 2 days.
Further, before filling the filler, a medicine injection tube is placed in the drill hole, the medicine injection tube extends into the drill hole, the end part of the medicine injection tube is close to the bottom of the hole, and calcium ion solution is injected through the medicine injection tube.
Further, in the standing process, if the separation wall sinks, the bacteria liquid and the calcium ion solution are sequentially supplemented.
Further, the amount of the bacteria liquid poured in and the amount of the calcium ion solution injected in are both one pore volume of all the fine sand in one drilling volume.
The technical scheme of the invention has the following advantages:
1. according to the barrier wall provided by the invention, the bacterial colony in the bacterial liquid can generate urease, decompose urea and generate calcium carbonate deposition with calcium ions, and in the calcium carbonate deposition process, the filler is used as a growth crystal nucleus to realize the bonding between the fillers, so that the barrier wall with the strength and the permeability coefficient meeting the requirements is formed. When the later stage place is restoreed, only need to open the drill way, slowly pour into acid solution into, can make the separation wall structure collapse, the rethread slush pump take out the fine sand can, need not secondary excavation and can realize dismantling of separation wall, make dismantling of separation wall simpler.
2. According to the barrier wall provided by the invention, fine sand is pollution-free, so that secondary pollution caused by fine sand residue is avoided. And in the construction process, extremely fine materials such as bentonite and cement are not needed, so that the contact of construction workers to dust in the construction process is reduced, and the physical health of the construction workers is guaranteed to a certain extent.
3. The barrier wall provided by the invention has the advantages that the compressive strength is more than 20MPa, and the permeability coefficient is 10-9The thickness is less than cm/s, which meets the basic use requirement of the barrier wall.
4. The construction method of the barrier wall provided by the invention is simple, easy to operate and easy to dismantle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a top view of a barrier wall in an embodiment of the invention.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
The used myxococcus xanthus powder has the preservation number: ATCC 25232, purchased from the American type culture Collection.
The sulfate reducing bacteria powder is common desulfurization vibrio powder, and the preservation number is as follows: CGMCC 1.5190, purchased from China general microbiological culture Collection center.
The denitrifying bacteria powder is denitrogenated thiobacillus powder, and the preservation number is as follows: DSM 26407, available from the German Collection of microorganisms and cells.
The used Bacillus pasteurianus powder has a preservation number: ATCC 11859, purchased from the American type culture Collection.
Example 1
The present embodiment provides a partition wall, as shown in fig. 1, which is formed by connecting a plurality of columns, and the method for constructing the partition wall includes the following steps:
s1, adding 30g/L of pasteurella bacillus powder, 20g/L of ammonium sulfate and 10g/L of urea into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 36 hours at 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 2
The structure of the barrier wall provided by the embodiment is the same as that of the embodiment 1, and the construction method of the barrier wall comprises the following specific steps:
s1, adding 30g/L of pasteurella bacillus powder, 20g/L of ammonium sulfate and 10g/L of urea into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 36 hours at 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 5 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 3
The structure of the partition wall provided by the embodiment is the same as that of the embodiment 1, the formula of the fermentation medium used in the construction process of the partition wall is a mixed solution of ammonium sulfate and urea, wherein the concentration of the ammonium sulfate is 15g/L, the concentration of the urea is 15g/L, and the construction method of the partition wall comprises the following specific steps:
s1, adding the bacillus pasteurii powder with the adding amount of 20g/L, the ammonium sulfate with the adding amount of 15g/L and the urea with the adding amount of 15g/L into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 36 hours at the temperature of 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 850mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 20 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 4
The structure of the barrier wall provided by the embodiment is the same as that of the embodiment 1, and the construction method of the barrier wall comprises the following specific steps:
s1, adding the bacillus pasteurii powder with the adding amount of 20g/L, the ammonium sulfate with the adding amount of 15g/L and the urea with the adding amount of 15g/L into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 24 hours at 37 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 5
The structure of the barrier wall provided by the embodiment is the same as that of the embodiment 1, and the construction method of the barrier wall comprises the following specific steps:
s1, adding the bacillus pasteurii powder with the adding amount of 20g/L, the ammonium sulfate with the adding amount of 15g/L and the urea with the adding amount of 15g/L into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 72 hours at the temperature of 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium nitrate solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium nitrate solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium nitrate solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 6
The structure of the barrier wall provided by the embodiment is the same as that of the embodiment 1, and the construction method of the barrier wall comprises the following specific steps:
s1, adding the bacillus pasteurii powder with the adding amount of 20g/L, the ammonium sulfate with the adding amount of 15g/L and the urea with the adding amount of 15g/L into water to prepare a mixed solution, adjusting the pH of the mixed solution to 6.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 36 hours at the temperature of 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting calcium dihydrogen phosphate solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium dihydrogen phosphate solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium dihydrogen phosphate solution is 0.1 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 7
The structure of the barrier wall provided by the embodiment is the same as that of the embodiment 1, and the construction method of the barrier wall comprises the following specific steps:
s1, adding the bacillus pasteurii powder with the adding amount of 20g/L, the ammonium sulfate with the adding amount of 15g/L and the urea with the adding amount of 15g/L into water to prepare a mixed solution, adjusting the pH of the mixed solution to 9.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 36 hours at the temperature of 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium acetate solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium acetate solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium acetate solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 8
The structure of the barrier wall provided by the embodiment is the same as that of the embodiment 1, and the construction method of the barrier wall comprises the following specific steps:
s1, adding 20g/L of myxococcus xanthus powder, 15g/L of ammonium sulfate and 15g/L of urea into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing at 25 ℃ for 36 hours;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 9
The structure of the barrier wall provided by the embodiment is the same as that of the embodiment 1, and the construction method of the barrier wall comprises the following specific steps:
s1, adding 20g/L of thiobacillus denitrificans powder, 15g/L of ammonium sulfate and 15g/L of urea into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing at 25 ℃ for 36 hours;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Example 10
The construction method of the barrier wall in the embodiment is the same as that in embodiment 1, and comprises the following specific steps:
s1, adding 20g/L of common vibrio devulcani powder, 15g/L of ammonium sulfate and 15g/L of urea into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 36 hours at 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 1 day after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Comparative example 1
The comparative example discloses a construction method of a barrier wall, which comprises the following steps:
s1, preparing cement paste: firstly, mixing water and cement according to a mass ratio of 1: 1, starting the stirrer to stir for 10-20min, and finishing cement preparation.
S2, drilling by a drilling machine: the drilling depth was 10m and the hole diameter was 600 mm.
S3, lifting the guniting pipe: after the guniting pipe sinks to reach the designed depth, the guniting pipe rotates and lifts while guniting according to the guniting pressure of 20-40MPa until the expected reinforcement height is reached.
S4, after completing the injection of 1 hole, standing for 1 day after the injection of the calcium chloride solution is completed, then sealing the drilling hole, and moving the pile machine to construct the next pile.
Comparative example 2
The comparative example discloses a construction method of a barrier wall, the formula of a fermentation medium is a mixed solution of ammonium sulfate and urea, wherein the concentration of the ammonium sulfate is 15g/L, the concentration of the urea is 15g/L, and the construction method of the barrier wall comprises the following specific steps:
s1, adding the pasteurella bacillus powder with the adding amount of 10g/L, the ammonium sulfate with the adding amount of 15g/L and the urea with the adding amount of 15g/L into water to prepare a mixed solution, adjusting the pH of the mixed solution to 7.5 by using ammonia water and dilute sulfuric acid with the concentration of 0.1mol/L, and fermenting and culturing for 36 hours at the temperature of 25 ℃;
s2, drilling a hole by using a drilling machine, wherein the depth of the hole is 10m, the diameter of the hole is 600mm, and after the drilling is finished, the medicine injection tube is stretched into the drilled hole, so that the end part of the medicine injection tube is close to the bottom of the hole;
s3, adding fine sand with the grain diameter of 10 meshes into the hole until the fine sand fills the hole;
s4, slowly pouring the bacterial liquid into the drill hole from the hole opening, so that the bacterial liquid permeates into the hole through the fine sand until the bacterial liquid emerges from the hole opening;
s5, injecting a calcium chloride solution with the same volume as the bacterial liquid into the drill hole through the injection tube, and lifting the injection tube while injecting, so that the calcium chloride solution is completely injected when the injection tube is completely lifted, and the concentration of the calcium chloride solution is 0.05 mol/L;
s6, standing for 2 days after the calcium chloride solution is injected, and then sealing the drilling hole;
and S7, repeating the steps S2-S6 to connect a plurality of columns to form a barrier wall.
Test example 1
The method comprises the following steps of constructing a barrier wall according to examples 1-11 and comparative examples 1-2 respectively, and testing the permeability coefficient of the barrier wall, wherein the specific test method comprises the following steps: (1) drilling a proper amount of calcium carbonate column material by using a Geoprobe (soil sampler) after the wall body is plastic and before a well mouth is closed; (2) determining the permeability coefficient according to GB/T19979.2-2006 determination of permeability coefficient of part 2 of the seepage-proofing performance of the geosynthetic material; the test results are shown in table 1:
TABLE 1 permeation coefficient test results
| Test of | Coefficient of penetration (cm/s) |
| Example 1 | 4.77×10-10 |
| Example 2 | 0.21×10-10 |
| Example 3 | 1.71×10-10 |
| Example 4 | 9.10×10-10 |
| Example 5 | 5.20×10-10 |
| Example 6 | 6.81×10-10 |
| Example 7 | 8.52×10-10 |
| Example 8 | 7.56×10-10 |
| Example 9 | 8.00×10-10 |
| Example 10 | 5.99×10-10 |
| Comparative example 1 | 8.84×10-10 |
| Comparative example 2 | 8.24×10-6 |
As can be seen from table 1, in examples 1 to 10, compared with comparative example 1, there is no significant difference in permeability coefficient, and the permeability coefficient of the produced calcium carbonate column is lower than that of the cement column under the condition of high addition concentration of bacterial powder, indicating that the barrier effect is better.
In comparison with comparative example 2, in examples 1 to 10, the wall permeability coefficient did not reach 10 within the same curing time due to the addition of the bacterial powder lower than the design value-9cm/s or less, indicating that the curing barrier effect is not as expected.
Test example 2
The method comprises the following steps of constructing the barrier wall according to examples 1-11 and comparative examples 1-2 respectively, and testing the compressive strength of the barrier wall, wherein the specific test method comprises the following steps: GB/T11837 and 2009 concrete pipe concrete compressive strength test method; the test results are shown in table 2:
TABLE 2 compressive Strength test results
As can be seen from Table 2, the compressive strength of examples 1-10 is not significantly different from that of comparative example 1, and the compressive strength of the generated calcium carbonate column is higher than the permeability coefficient of the cement column under the condition of high bacterial powder addition concentration, which indicates that the barrier wall constructed by the technology of the application has high strength and is not easy to damage.
Compared with the comparative example 2, in the examples 1 to 10, the compressive strength of the wall is lower than that of the wall in the same curing time because the concentration of the added bacterial powder is lower than the designed value, which shows that the use of the bacterial powder with the concentration lower than the set value can seriously affect the compressive strength of the wall.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. The barrier wall is characterized by being formed by connecting a plurality of columns; the column body comprises a filler and a continuous, complete and compact calcium carbonate column filled in the pores of the filler; the permeability coefficient of the column is 10-9cm/s or less.
2. The barrier wall of claim 1, wherein the filler is fine sand having a particle size of 5 to 20 mesh.
3. The barrier wall of claim 1 or 2, wherein the calcium carbonate column is synthesized in the pores of the filler by microorganisms in the bacterial liquid using a calcium ion solution; the microorganism in the bacterial liquid is selected from one or more of myxococcus xanthus, sulfate reducing bacteria, denitrifying bacteria and bacillus pasteurianus.
4. The barrier wall of claim 3, wherein the bacteria liquid obtaining method comprises:
adding 20-30g/L of corresponding strain powder, 15-20g/L of ammonium sulfate and 10-15g/L of urea into water to obtain a mixed solution, adjusting pH of the mixed solution to 6.5-9.5 with dilute sulfuric acid and ammonia water, and fermenting and culturing at 25-37 deg.C for 24-72 h.
5. A partition wall according to claim 3 or 4, wherein the concentration of said calcium ion solution is 0.05-0.1 mol/L.
6. A method of constructing a barrier wall according to any one of claims 1 to 5, comprising the steps of:
drilling holes, and filling filler into the holes;
slowly pouring bacterial liquid into the pores of the filler, injecting calcium ion solution and standing until the permeability coefficient of the column body is 10- 9cm/s or less;
sealing the drilling hole;
and circulating the steps to connect the plurality of columns to form the barrier wall.
7. The method of claim 6, wherein the standing time after the calcium ion solution is injected is 1 to 2 days.
8. A method as claimed in claim 6 or 7, wherein before filling the filler material, a cartridge is placed in the bore hole so that the cartridge extends below the bore hole, the end of the cartridge is close to the bottom of the bore hole, and a solution of calcium ions is injected through the cartridge.
9. The method for constructing a barrier wall according to claim 8, wherein the bacteria solution and the calcium ion solution are sequentially supplemented if the barrier wall sinks during the standing process.
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| CN105386432A (en) * | 2015-12-08 | 2016-03-09 | 南京林业大学 | Cast-in-situ bored pile with wall protected through microorganism soil solidification and construction method |
| CN110106826A (en) * | 2019-04-18 | 2019-08-09 | 重庆交通大学 | River bed microorganism grouting ecological anti-seepage system and its construction method |
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