CN113636810B - Curtain grouting method for vertical antifouling barrier - Google Patents

Curtain grouting method for vertical antifouling barrier Download PDF

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CN113636810B
CN113636810B CN202110908667.1A CN202110908667A CN113636810B CN 113636810 B CN113636810 B CN 113636810B CN 202110908667 A CN202110908667 A CN 202110908667A CN 113636810 B CN113636810 B CN 113636810B
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grouting
curing agent
kaolin
curtain
composite curing
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CN113636810A (en
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李绍华
金国龙
徐浩青
杨博文
李昀
刘红雷
车悦
周爱兆
胡梦狄
孙涛
马帅
侯绍雯
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Jiangsu University of Science and Technology
China Shipbuilding NDRI Engineering Co Ltd
Sinochem Environmental Remediation Shanghai Co Ltd
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Shanghai Shenglong Environment Remediation Technologies Co ltd
Jiangsu University of Science and Technology
China Shipbuilding NDRI Engineering Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention particularly discloses a curtain grouting method of a vertical antifouling barrier, which comprises the following raw materials: kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) = 1.28-1.33. According to the invention, through selecting the raw materials and optimizing the mixing proportion, the prepared grouting fluidity and density meet the grouting construction requirements, the grouting process is adjusted in a targeted manner, the grouting is carried out by a point injection method, the structure of grouting holes and the grouting sequence are optimized, the formed impervious wall has an excellent impervious effect, the permeability coefficient can reach 6.0E-08cm/s, in addition, through the corresponding coordination of the raw materials and the process, the application range of curtain grouting pressure is large, the application limit is effectively reduced, the comprehensive practicability is strong, the wide-range popularization and application can be realized, and the economic benefit is obviously improved.

Description

Curtain grouting method for vertical antifouling barrier
Technical Field
The invention relates to the technical field of anti-seepage curtain engineering, in particular to a curtain grouting method for a vertical anti-fouling barrier.
Background
Since the 20 th century and the 80 th century, a large amount of solid wastes are generated by the high-speed development of Chinese industrialization and urbanization, landfill is the inevitable choice for treating the solid wastes currently and in decades in the future in China, and landfill treatment pollution control is an environmental problem which needs to be solved urgently, so that a vertical antifouling barrier is produced at the same time, and the vertical antifouling barrier mainly plays a role in preventing leachate from polluting surrounding soil and underground water.
Curtain grouting is a process of delivering a stabilizing liquid or a mixed grouting liquid at a certain pressure through a nozzle inserted into the end of a spray pipe in a borehole in situ. Grout is a mixture of in situ soil combined with cement or ordinary portland cement slurry No. 42.5, and is a product that meets a specific strength or permeability. Curtain grouting is currently used in many environmental protection and soil improvement projects around the world.
The curtain grouting uses sealed grouting to fill the pores or rock cracks of the soil body, so that the better anti-seepage effect is achieved, pollutants are prevented from penetrating through the soil body through permeation, underground water and the soil body are polluted, the pores or rock cracks of the soil body must be completely filled, the drilling grouting of the curtain grouting is gradually encrypted according to the sequence arranged by the design, two rows of holes or a plurality of rows of holes curtains are drilled and grouted firstly at most at the lower row, then the upper row is drilled and grouted, finally the middle row is drilled and grouted, the same row of holes are drilled and grouted according to 3 sequences, and the design of the curtain grouting anti-seepage wall must consider the permeability of the soil body, the fluidity of grouting slurry and the permeability of slurry.
However, in the actual curtain grouting construction, the fluidity of the grout is often too low, so that the grout cannot be poured into the soil body through a point-spraying grout method; in addition, the fluidity is too large, the formed barrier after being poured into the soil body can not meet the requirement of pollutant seepage prevention, in order to meet the requirement of slurry required by curtain grouting, the invention comprehensively considers the aspects of fluidity, density and permeability of the slurry, the structure and the sequence of drilling grouting and the like, takes kaolin and a composite curing agent as basic raw materials, and invents a curtain grouting matching ratio and a corresponding construction method, thereby ensuring various performances and construction requirements of the curtain grouting slurry, forming a curtain, playing a good role in pollutant obstruction, and having no curtain grouting slurry with the matching ratio at present.
Disclosure of Invention
In view of the above, the invention aims to provide a curtain grouting method for a vertical antifouling barrier, which is characterized in that raw material selection and mixing proportion optimization are carried out, the prepared grouting fluidity and density meet grouting construction requirements, a grouting process is adjusted in a targeted manner, grouting is carried out by a point injection method, the structure of a grouting hole and the grouting sequence are optimized, and the formed impervious wall has an excellent impervious effect.
In order to solve the technical problems, the technical scheme provided by the invention is that the curtain grouting method of the vertical antifouling barrier comprises the following raw materials: kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) = 1.28-1.33.
Preferably, the composite curing agent is prepared from P.O42.5, slag, steel slag and gypsum according to the mass ratio of 2:5:2:2, and mixing the components in a ratio of 2.
Preferably, the kaolin accounts for 92-94% of the total mass of the kaolin and the composite curing agent, and the composite curing agent accounts for 6-8% of the total mass of the kaolin and the composite curing agent.
Preferably, the curtain grouting comprises the following raw materials: the composite curing agent comprises kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) =1.3, and in mass percentage, the kaolin accounts for 93% of the total mass of the kaolin and the composite curing agent, and the composite curing agent accounts for 7% of the total mass of the kaolin and the composite curing agent.
Preferably, the curtain grouting has an average fluidity of 86 to 90mm and a density of 1.31 to 1.37g/cm 3 And the curtain grouting initial setting time is 14 +/-1 d.
Another object of the present invention is to provide a curtain grouting method of a vertical anti-fouling barrier, comprising grouting using a point injection method, extending a nozzle end of a grouting sleeve up to 60-120cm below an impervious layer (the insertion depth is adjusted according to the instruction manual according to construction requirements and ground exploration), and then connecting the outer port of the grouting sleeve with the curtain grouting method of the vertical anti-fouling barrier according to claim 5 through a high pressure pump, and as the sleeve is drawn out, the grouting slurry is extruded from the nozzle at high pressure, thereby completing grouting.
Preferably, grouting comprises pouring 2-3 rows of overlapping columns of grouted earth to form a continuous diaphragm wall.
Preferably, the grouting pressure of the high-pressure pump is 12.5-800 kPa.
Preferably, the permeability coefficient of the impervious wall is 6.0E-08-4.3E-07 cm/s.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, through selecting raw materials and optimizing the mixing proportion, the prepared grouting fluidity and density meet the grouting construction requirements, the grouting process is adjusted in a targeted manner through curtain grouting of the mixing proportion, the grouting is carried out by a point injection method, the structure of a grouting hole and the grouting sequence are optimized, the formed impervious wall has an excellent impervious effect, the permeability coefficient can reach 6.0E-08cm/s, and the service life is prolonged by more than 2 times.
(2) This application is arranged in the upper reaches, the low reaches is arranged and is just "V", the crisscross pouring of "V" shape in proper order, then arranges the interval pouring in the middle, and hole post border coincide overlaps and establishes, forms closely knit protection curtain from this, compares traditional grout hole structure and filling order, and the prevention of seepage effect is showing and is improving, and the cooperation between adjacent grout post promotes, and inspection hole infiltration qualification rate reaches more than 98%.
(3) The curtain grouting pressure application range is large through corresponding coordination of raw materials and a process, the permeability coefficients under different pressure states are measured by a flexible wall permeameter through step-by-step pressure loading, the permeability coefficients under different pressures can meet the anti-seepage requirement (the experimental data are shown in detail in figure 3), the curtain grouting pressure application method can be popularized and applied in a large range, the application limit is effectively reduced, the comprehensive practicability is strong, and the economic benefit is remarkably improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a sequence of injection of a point-jet grouting barrier according to the present invention;
FIG. 2 is a diagram showing the state of the point injection method of the present invention extending into the soil pore space through the casing and the penetration of rock cracks;
FIG. 3 is a graph showing the permeability coefficient of curtain grouting according to the present invention as a function of loading pressure.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Kaolin, P.O42.5, slag, steel slag and gypsum used in the following examples were all purchased from commercial sources. Specifically, the raw materials are purchased as follows:
the kaolin used has a density of 2.57g/cm 3 Fineness of 0.038mm, screen residue of less than or equal to 10 percent, sand mass fraction of 40-47 percent, and SiO 2 Content is not less than 40%, al 2 O 3 The content is more than or equal to 32 percent.
The specific gravity of the adopted Portland cement is 3.0-3.2 g/cm 3 Fineness of 0.08mm, screen residue of less than or equal to 10 percent, initial setting time of more than or equal to 45min, final setting time of less than or equal to 10h,28d compressive strength of more than or equal to 42.5MPa 3 The content is less than or equal to 3.5 percent, the MgO content is less than or equal to 5.0 percent, and the ignition loss is less than or equal to 5.0 percent.
The specific gravity of the slag is 2.8-3.0g/cm 3 The specific surface area is more than or equal to 330m 2 /kg, alkalinity is more than or equal to 1.72 and 28The d activity index is more than or equal to 100 percent, the 28d compressive strength is more than or equal to 60.5Mpa, the fluidity ratio is more than or equal to 90 percent, the ignition loss is less than or equal to 3.2 percent, the CaO content is more than or equal to 38 percent, and the SiO 2 Content is more than or equal to 34 percent, and Al 2 O 3 The content is more than or equal to 18 percent.
The specific surface area of the steel slag is more than or equal to 390m 2 Kg, granularity 0.03mm, screen residue not more than 10%, alkalinity not less than 1.61, feO not more than 15.5%, siO 2 ≤22.5％，CaO≤32.4％，Al 2 O 3 ≤10.3％，MnO≤2.15％，MgO≤5.6％。
The specific surface area of the gypsum is more than or equal to 310m 2 Per kg, caO content less than or equal to 31 percent, SO 3 The content is less than or equal to 43.2 percent, the initial setting time is more than or equal to 15min, the final setting time is less than or equal to 8min, the compressive strength after hardening is more than or equal to 26.8MPa, and the softening coefficient is more than or equal to 0.42.
In actual construction, grouting is performed by using a point injection method, the injection hole end of the grouting sleeve is extended to 60-120cm below the impermeable layer (fig. 2), then the curtain grouting method of the vertical antifouling barrier prepared in the embodiment of the invention is communicated with the outer port of the grouting sleeve through a high-pressure pump, and grouting slurry is extruded from the injection hole at high pressure along with the extraction of the sleeve, so as to complete grouting, and specifically, grouting comprises the step of pouring 3 rows of mutually overlapped grouting soil columns (fig. 1), so as to form a continuous impermeable wall.
Example 1
The curtain grouting comprises the following raw materials: the composite curing agent comprises kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) =1.3, and in mass percentage, the kaolin accounts for 93% of the total mass of the kaolin and the composite curing agent, and the composite curing agent accounts for 7% of the total mass of the kaolin and the composite curing agent.
The composite curing agent is prepared from P.O42.5, slag, steel slag and gypsum according to the mass ratio of 2:5:2:2, and mixing the components in a ratio of 2.
Specifically, 637kg of kaolin, 8.7kg of P.O42.5, 22kg of slag, 8.7kg of steel slag, 8.7kg of gypsum and 890kg of water are prepared into curtain grouting in each cubic meter.
The curtain grouting has an average fluidity of 88.4mm and a density of 1.35g/cm 3 。
And (3) grouting by adopting a point jet method, wherein the jet hole end of the grouting sleeve extends to 60-120cm below the impervious layer, pressurizing and jetting and discharging the curtain grouting of the embodiment at 12.5KPa to finish 3 rows of grouting and form a continuous impervious wall, the initial setting time of the curtain grouting is 14 +/-1 d, and the permeability coefficient is 4.3E-07cm/s.
Example 2
The curtain grouting comprises the following raw materials: the composite curing agent comprises kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) =1.33, and the kaolin accounts for 93% of the total mass of the kaolin and the composite curing agent accounts for 7% of the total mass of the kaolin and the composite curing agent.
The composite curing agent is prepared from P.O42.5, slag, steel slag and gypsum according to the mass ratio of 2:5:2:2, and mixing the components in a ratio of 2.
Specifically, 637kg of kaolin, 8.7kg of P.O42.5, 22kg of slag, 8.7kg of steel slag, 8.7kg of gypsum and 911kg of water are prepared into curtain grouting by each cubic meter.
The average fluidity of curtain grouting was 89.7mm, and the density of curtain grouting was 1.31g/cm 3 。
And (3) grouting by adopting a point jet method, wherein the jet hole end of the grouting sleeve extends to 60-120cm below the impervious layer, pressurizing and jetting and discharging the curtain grouting of the embodiment at 12.5KPa to finish 3 rows of grouting to form a continuous impervious wall, the initial setting time of the curtain grouting is 14 +/-1 d, and the permeability coefficient is 6.05E-07cm/s.
Example 3
The curtain grouting comprises the following raw materials: the composite curing agent comprises kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) =1.28, and the kaolin accounts for 93% of the total mass of the kaolin and the composite curing agent accounts for 7% of the total mass of the kaolin and the composite curing agent.
The composite curing agent is prepared from P.O42.5, slag, steel slag and gypsum according to the mass ratio of 2:5:2:2, and mixing the components in a ratio of 2.
Specifically, 637kg of kaolin, 8.7kg of P.O42.5, 22kg of slag, 8.7kg of steel slag, 8.7kg of gypsum and 877kg of water are prepared into curtain grouting in each cubic meter.
The curtain grouting has an average fluidity of 86mm and a density of 1.37g/cm 3 。
And (3) grouting by adopting a point jet method, wherein the jet hole end of the grouting sleeve extends to 60-120cm below the impervious layer, pressurizing and jetting and discharging the curtain grouting of the embodiment at 12.5KPa to finish 3 rows of grouting and form a continuous impervious wall, the initial setting time of the curtain grouting is 14 +/-1 d, and the permeability coefficient is 4.97E-07cm/s.
Examples 4 to 9
Based on the performance test results of the above examples 1 to 3, the curtain grouting mixture ratio of the example 1 has the highest application benefit. The curtain grouting has an average fluidity of 88.4mm and a density of 1.35g/cm 3 The initial setting time is about 14 days, the pressure in the grouting process is 12.5KPa, and the permeability coefficient of the impervious wall is 4.3E-07cm/s.
The fluidity and density of the grouting prepared by the mixing ratio meet the grouting construction requirements, the grouting process is designed in a targeted manner, the grouting is performed by a point injection method, the structure of grouting holes and the grouting sequence are optimized, and the formed impervious wall has an excellent impervious effect.
The grouting holes are 3 rows, specifically, the grouting holes are sequentially subjected to positive V-shaped and reverse V-shaped staggered pouring before the upstream row and the downstream row, then the grouting holes are poured at intervals in the middle row, and the edges of the hole columns are overlapped and overlapped, so that a compact protective curtain wall is formed.
Taking the raw materials of the curtain grouting mixture ratio in the example 1, sequentially adjusting the grouting process pressure to be 25KPa, 50KPa, 100KPa, 200KPa, 400KPa and 800KPa to obtain examples 4-9, and carrying out performance test on the impervious wall (dam repair) obtained in the examples 4-9, wherein the obtained permeability coefficient and the permeability coefficient data in the example 1 are as follows:
variable head test method: k =2.3 (a L/a t) \ 13266; (. DELTA.h 1/. DELTA.h 2)
In the formula, a is the cross-sectional area of the glass tube; a is the cross-sectional area of the sample; l is the length of the sample; and (3) measuring and recording the final water head difference delta h2 after the time t from the initial water head difference delta h1, wherein the delta t is a time difference value.
a(cm 2 ) L(cm) A(cm 2 ) Δt(s) Δh 1 (cm) Δh 2 (cm) k(cm/s)
12.5kPa 0.2 2 30 3600 107.4 95.6 4.3E-07
25kPa 0.2 2 30 3600 108.7 97.9 3.9E-07
50kPa 0.2 2 30 3900 108.4 100.2 2.7E-07
100kPa 0.2 2 30 3600 109.4 103.8 1.9E-07
200kPa 0.2 2 30 3600 102.4 98.7 1.4E-07
400kPa 0.2 2 30 3600 106.8 104.1 9.5E-08
800kPa 0.2 2 30 4800 103 100.8 6.0E-08
According to the invention, through selecting raw materials and optimizing the mixing proportion, the prepared grouting fluidity and density meet the grouting construction requirements, the grouting process is adjusted in a targeted manner by curtain grouting of the mixing proportion, grouting is performed by a point injection method, the structure of grouting holes and the grouting sequence are optimized, the formed impervious wall has an excellent impervious effect, the permeability coefficient can reach 6.0E-08cm/s, and the service life is prolonged by more than 2 times.
Comparative example:
grouting, which is also applied as a dam repairing curtain barrier, is selected from the following commercially available general grouting materials:
400kg/m water 3 30kg/m of bentonite 3 150kg/m of cement (P.042.5) 3 Sand and gravel 1300kg/m 3 The plastic concrete mixture obtained by the method is used for dam restoration under the same conditions, the permeability coefficient k =1.0E-07, and the unconfined compressive elastic modulus is 60-120 psi (100-180 psi in the application), obviously, compared with the existing grouting product, the plastic concrete mixture has the advantages of excellent anti-seepage effect improvement and obviously improved structural strength.
Furthermore, the existing grouting formula is only suitable for first-class soil and second-class soil, application development is greatly limited, the grouting prepared according to the formula can be suitable for third-class soil and fourth-class soil, comprehensive benefits are high, cost is controllable, cost performance is remarkably improved, and economy and high efficiency are achieved.
Wherein, the soil is soft soil; the second kind of soil is common soil; the third soil is hard soil; the four types of soil are gravel firms (see the engineering classification of soil).
According to the method, the raw materials and the process are correspondingly matched, the application range of curtain grouting pressure is large, the pressure is loaded step by step, the flexible wall permeameter is used for measuring the permeability coefficient under different pressure states, the permeability coefficient under different pressures can be obtained and meets the anti-seepage requirement (the test data is shown in detail in figure 3), the problem of water conservancy splitting of soil layers is effectively avoided on the basis of strengthening the structural strength and the anti-seepage effect, the method can be popularized and applied on a large scale, the application limit is effectively reduced, the comprehensive practicability is strong, and the economic benefit is remarkably improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. A curtain grouting method of a vertical antifouling barrier is characterized in that the curtain grouting comprises the following raw materials: kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) =1.28 to 1.33;
the composite curing agent is prepared from P.O42.5, slag, steel slag and gypsum according to the mass ratio of 2:5:2:2 in proportion;
the curtain grouting average fluidity is 86 to 90mm, the curtain grouting density is 1.31 to 1.37g/cm & lt 3 & gt, and the curtain grouting initial setting time is 14 +/-1 d;
the curtain grouting method of the vertical antifouling barrier comprises the steps of grouting by using a point injection method, enabling the injection hole end of a grouting sleeve to extend to 60-120cm below a impervious layer, then enabling curtain grouting to be communicated with the outer end port of the grouting sleeve through a high-pressure pump, and extruding grouting slurry from the injection hole at high pressure along with the extraction of the sleeve to finish grouting; the grouting comprises the steps of pouring 3 rows of mutually overlapped grouting soil columns to form a continuous impervious wall, wherein the 3 rows of grouting holes are sequentially poured in a positive V shape and an inverted V shape in a staggered manner before an upstream row and a downstream row, then the grouting holes are poured at intervals in the middle row, and the edges of the hole columns are overlapped to form a compact protective curtain wall;
the grouting pressure of the high-pressure pump is 12.5 to 800kPa.
2. The curtain grouting method for the vertical antifouling barrier as claimed in claim 1, wherein the kaolin accounts for 92 to 94 percent of the total mass of the kaolin and the composite curing agent, and the composite curing agent accounts for 6 to 8 percent of the total mass of the kaolin and the composite curing agent.
3. A method of curtain grouting of a vertical anti-fouling barrier according to claim 1, wherein the curtain grouting comprises the following raw materials: the composite curing agent comprises kaolin, a composite curing agent and water, wherein the weight ratio of water/(kaolin + composite curing agent) =1.3, and in mass percentage, the kaolin accounts for 93% of the total mass of the kaolin and the composite curing agent, and the composite curing agent accounts for 7% of the total mass of the kaolin and the composite curing agent.
4. The method for curtain grouting of a vertical antifouling barrier as claimed in claim 1, wherein the permeability coefficient of the impervious wall is 6.0E-08 to 4.3E-07cm/s.
CN202110908667.1A 2021-08-09 2021-08-09 Curtain grouting method for vertical antifouling barrier Active CN113636810B (en)

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