CN110054455B - Flyash-based anti-seepage material for anti-seepage closure underground curtain wall and construction method - Google Patents
Flyash-based anti-seepage material for anti-seepage closure underground curtain wall and construction method Download PDFInfo
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- CN110054455B CN110054455B CN201910331989.7A CN201910331989A CN110054455B CN 110054455 B CN110054455 B CN 110054455B CN 201910331989 A CN201910331989 A CN 201910331989A CN 110054455 B CN110054455 B CN 110054455B
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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
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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
- C04B28/08—Slag cements
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- 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
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- 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
- E02D19/185—Joints between sheets constituting the sealing aprons
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a coal ash-based seepage-proofing material for an seepage-proofing closure underground curtain wall and a construction method, the seepage-proofing material does not need sand and stone, can utilize waste coal ash of a power plant, can reduce the emission of solid waste and damage to the environment, and is green and environment-friendly; the anti-seepage material is used for pouring to form the underground curtain wall, the construction is convenient, the pouring process flow is simple, and the formed underground continuous wall has strong adaptability and good anti-seepage performance. The invention provides a fly ash-based seepage-proofing material for an seepage-proofing closure underground curtain wall, which comprises the following components in parts by weight: 40 parts of cement, 50-70 parts of fly ash, 5-10 parts of silica fume, 2-4 parts of bentonite, 2-3 parts of sodium chloride, 1.5-3 parts of calcium lignosulfonate and 60-70 parts of water.
Description
Technical Field
The invention relates to the technical field of seepage-proofing closure of strip mines, metal mines and miners, in particular to a fly ash-based seepage-proofing material for an underground curtain wall for seepage-proofing closure of strip mines.
Background
At present, the mine water interception curtain mainly comprises a grouting curtain, waterproof curtain piles and an underground continuous wall. The grouting curtain is convenient to construct and simple in process flow, but has the defects of discontinuity of grouting stone bodies, unsatisfactory water stop effect, low curtain wall strength and the like. The waterproof curtain pile has the advantages of good waterproof effect and convenience in ground construction, but the waterproof curtain pile is not strong enough, high in manufacturing cost and long in construction period. The underground diaphragm wall has good seepage-proofing property, strong adaptability, high efficiency and reliable quality, but the cost of the material is high, and aggregates such as sand, stone and the like adopted in the concrete need to be obtained by sand excavation and stone quarrying, so that the environment is damaged, and the method is not in the way of the existing environmental protection policy.
Disclosure of Invention
In view of the above, the invention provides a fly ash-based seepage-proofing material for an seepage-proofing closure underground curtain wall, which does not need sand and stone, can utilize the fly ash which is a waste of a power plant, can reduce the discharge of solid waste and damage to the environment, and is green and environment-friendly; the anti-seepage material is used for pouring to form the underground curtain wall, the construction is convenient, the pouring process flow is simple, and the formed underground continuous wall has strong adaptability and good anti-seepage performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a fly ash-based seepage-proofing material for an seepage-proofing closure underground curtain wall, which comprises the following components in parts by weight:
40 parts of cement, 50-70 parts of fly ash, 5-10 parts of silica fume, 2-4 parts of bentonite, 2-3 parts of sodium chloride, 1.5-3 parts of calcium lignosulfonate and 60-70 parts of water. The water is preferably drinking water, and the purity of the used water can be ensured by adopting the drinking water. Preferably, the fly ash is 55-65 parts (such as 60 parts) by weight, and the obtained barrier material has good barrier property and high economical efficiency.
The fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall disclosed by the invention has the advantages that through the optimized allocation of a formula system, sand and stone are not needed, the waste fly ash of a power plant is fully utilized, and high-doped fly ash (for example, 60% based on the total mass of cement and fly ash) can be added, so that the green and environment-friendly utilization of the fly ash is realized, the engineering cost of the seepage-proofing closure underground curtain wall is reduced, the construction efficiency is improved, and the continuous and effective seepage prevention of the seepage-proofing closure underground curtain. NaCl is added into the formula system to break bonds formed between glass bodies, so that the potential activity of the fly ash is excited, and the hydration reaction is promoted. The bentonite is added to react with water in a formula system to expand by a plurality of times to 20-30 times, so that the gaps of the fly ash-based mortar concretion body of the underground curtain wall for seepage prevention and closure of the strip mine can be effectively filled, and a good seepage prevention effect is realized. The addition of calcium lignosulfonate can lead out gas in the fly ash-based seepage-proofing material of the seepage-proofing closure underground curtain wall of the strip mine in the pumping and pouring processes, so that the porosity of the seepage-proofing material is reduced and the seepage-proofing material is more compact; through the combined action of all the components, the fly ash-based seepage-proofing material of the seepage-proofing closure underground curtain wall is convenient to construct under the condition of not using gravels, and the formed underground continuous wall has strong adaptability and good seepage-proofing property.
In a preferred embodiment, the bentonite contains not less than 85 wt% of montmorillonite, and the particle size is not more than 200 meshes.
In a preferred embodiment, the fly ash is class ii or higher fly ash, preferably class ii or higher power plant dry ash. As is well known to those skilled in the art, the standard of class II fly ash is that the fineness (45um air flow sieve, screen residue) is less than or equal to 20 percent, the ignition loss is less than or equal to 8 percent, the water requirement ratio is less than or equal to 105 percent, the water content is less than or equal to 1 percent, and the percentages refer to mass percent.
In a preferred embodiment, the cement may be ordinary portland cement, portland slag cement, pozzolan portland cement, or composite portland cement, and specifically, for example, ordinary portland cement of P · O42.5.
In a preferred embodiment, the silica fume is dry ash with fineness less than 1um, accounting for more than 80 wt%, and average particle size of 0.1-0.3 um. The optimized silica fume can be used for filling the pores among cement particles and fly ash particles, and can produce a gelled body with hydration products, so that the compression resistance, the folding resistance, the seepage resistance and the corrosion resistance are improved, and meanwhile, the water retention, the segregation resistance and the water bleeding resistance can be realized.
The fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall provided by the invention has a simple preparation process. Can be prepared by a preparation method comprising the following steps: mixing water, sodium chloride and calcium lignosulfonate, and stirring uniformly; then adding bentonite, and stirring uniformly; and adding the rest components, and uniformly stirring to obtain the fly ash-based anti-seepage material for the underground curtain wall.
The invention also provides an anti-seepage closure underground curtain wall which is formed by pouring the anti-seepage material, and the anti-seepage closure underground curtain wall is preferably an anti-seepage closure underground curtain wall for a strip mine.
The invention also provides a construction method of the seepage-proofing closure underground curtain wall, which comprises the following steps:
1) excavating a first groove section and a second groove section, pouring impervious materials into the first groove section and the second groove section respectively, and replacing slurry in the first groove section and the second groove section; forming continuous stone bodies in the first groove section and the second groove section respectively;
2) excavating a third groove section between the first groove section and the second groove section, pouring an impermeable material into the third groove section, and replacing slurry in the third groove section; forming continuous stone bodies in the third groove section, wherein the stone bodies formed in the third groove section are respectively and mutually lapped with the stone bodies of the first groove section and the second groove section to form the seepage-proofing intercepting underground curtain wall;
the impervious material in the step 1) and the step 2) is the underground curtain wall fly ash-based impervious material. By adopting the construction method, reasonable and orderly excavation can be realized, the pouring efficiency is improved, the mutual interference between adjacent groove sections during pouring is avoided, and the pouring is ensured to be carried out smoothly.
In some embodiments, more than two sections of the seepage-proofing and intercepting underground curtain walls which are mutually overlapped can be formed by repeating the steps 1) to 2), namely, a plurality of sections of seepage-proofing and intercepting underground curtain walls which are mutually connected are formed.
Preferably, step 2) is performed after 6 to 10 days from the completion of the operation of step 1).
Preferably, before the impermeable material is poured into the first groove section, the second groove section or the third groove section, a grouting pipe for conveying the impermeable material is arranged in the groove section in which the impermeable material needs to be poured, the distance from the bottom outlet of the grouting pipe to the bottom of the groove section in which the impermeable material needs to be poured is 10-15cm, the impermeable material is poured in this way, the impermeable material is poured into the bottom, and mud in the groove section can be directly replaced.
The fly ash-based seepage-proofing material of the seepage-proofing closure underground curtain wall is particularly suitable for being applied to the seepage-proofing closure underground curtain wall of the strip mine.
The technical scheme provided by the invention has the following beneficial effects:
the fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall has the characteristics of convenience in grouting curtain construction, simple pouring process flow, strong adaptability of the underground continuous wall and good seepage-proofing property; but also can make full use of the power plant waste fly ash, reduce the discharge of solid waste and is green and environment-friendly.
The seepage-proofing closure underground curtain wall fly ash-based seepage-proofing material provided by the invention can replace the traditional seepage-proofing concrete or plastic concrete, has the characteristics of low cost and high seepage-proofing performance, realizes the green and environment-friendly utilization of the fly ash, lightens the environment-friendly pressure of sand and stone excavation, reduces the engineering cost of the seepage-proofing closure underground curtain wall, improves the construction efficiency, realizes the continuous and effective seepage-proofing of the seepage-proofing closure underground curtain wall, improves the seepage-proofing effect, fully saves water resources, and realizes the green water-retaining exploitation of open mines.
The seepage-proofing closure underground curtain wall can replace the traditional drilling grouting curtain and the concrete underground continuous wall.
Drawings
FIG. 1 is a schematic view of an impervious closure underground curtain wall casting.
FIG. 2 is a plan view of an impervious damming underground curtain wall.
Description of reference numerals:
1. a trough section; 2. grouting pipes; 3. slurry; 4. a stone body of the first trough section; 5. a stone body of the second groove section; 6. a stone body of a third trough section; 7. an anti-seepage closure underground curtain wall.
Detailed Description
In order to better understand the technical solution of the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
The raw materials used in the following examples are illustrated below:
cement: ordinary Portland cement of P.O 42.5 of cement factory of Querchi Mongolia.
Fly ash: huaneng river power plant II-grade fly ash.
Bentonite: montmorillonite with mineral content not less than 85 wt% and particle size not more than 200 mesh.
Sodium chloride: pure 99% NaCl was analyzed.
Silica fume: SiO 22The content is more than or equal to 92 wt%, the fineness is less than 1um, the content is more than 80 wt%, and the average particle size is 0.1-0.3 um.
Example 1
The anti-seepage material comprises the following raw materials in parts by weight: 40 parts of cement, 60 parts of fly ash, 5 parts of silica fume, 2 parts of bentonite, 2 parts of sodium chloride, 1.5 parts of calcium lignosulfonate and 70 parts of drinking water.
1.1, preparing the fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall of the strip mine according to the following steps:
step 1), taking drinking water, sodium chloride and calcium lignosulphonate according to the weight of the formula, and uniformly stirring the drinking water, the sodium chloride and the calcium lignosulphonate in a slurry stirrer for 30 seconds;
step 2), weighing bentonite according to the weight of the formula, adding the bentonite into the solution stirred in the step 1), and uniformly stirring for 20 s;
and 3) respectively adding cement, fly ash and silica fume into the mixture stirred in the step 2) according to the formula weight, stirring while adding, and uniformly stirring for 90s after adding within 20 s.
1.2, pouring an anti-seepage closure underground curtain wall of the strip mine:
the mud retaining wall is used in the process of grooving the seepage-proofing cut-off curtain wall, and the specific gravity of the mud in the groove section is 1.08g/cm3About, the slurry at the bottom of the tank may reach 1.2g/cm3(ii) a According to the followingPouring:
step 1), after the first groove section and the second groove section are excavated, testing the width and the verticality of each groove section, and arranging a grouting pipe 2 in each groove section under the condition that the design requirements are met, wherein the distance between the bottom of each grouting pipe 2 and the bottom of each groove section is 15 cm; referring to fig. 1, a grouting pouring process of a first groove section, a second groove section or a third groove section is described, that is, before grouting, a grouting pipe 2 is arranged in a groove section 1 (the groove section 1 may be the first groove section, the second groove section or the third groove section);
and (3) conveying the prepared impermeable material prepared in the step (1.1) to the bottoms of the excavated first groove section and the second groove section through a grouting pipe (2) by a high-flow mortar pump, and meanwhile, uniformly flowing and grouting in the grooves to rise to replace slurry (3) in the groove sections to form continuous stone bodies (4 and 5).
Step 2), excavating a third groove section 7 days after the operation of the step 1), similarly to the step 1), testing the width and the verticality of the groove section after the excavation is finished, arranging a grouting pipe 2 in the groove section under the condition of meeting the design requirement, wherein the bottom of the grouting pipe is 15cm away from the bottom of the groove; and (2) conveying the seepage-proofing material prepared in the previous step (1.1) to an excavated third groove section through a pipeline by a large-flow mortar pump to replace slurry 3 in the groove section, forming a continuous stone body 6 in the third groove section, and effectively lapping with stone bodies of the first groove section and the second groove section in the step (1) to form a complete seepage-proofing closure underground curtain wall 7 of the strip mine, which is shown in figure 2. The width of each groove segment was 0.8 m.
The fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall of the strip mine prepared by the embodiment has the specific gravity of 1.6g/cm3The calculus rate is 98.5 percent, the 7d compressive strength is 2.4MPa, the 28d compressive strength is 5.6MPa, the 60d compressive strength is 10.0MPa, and the 90d compressive strength is 11.5MPa, the 28d anti-permeability pressure value reaches 0.7MPa, the 60d anti-permeability pressure value reaches 0.8MPa, and the 90d anti-permeability pressure value reaches 0.9 MPa.
Example 2
The anti-seepage material comprises the following raw materials in parts by weight: 40 parts of cement, 60 parts of fly ash and 70 parts of drinking water.
2.1, preparing the fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall of the strip mine according to the following steps:
step 1), taking drinking water according to the weight of the formula;
and 2) respectively adding the cement and the fly ash into the mixture stirred in the step 1) according to the formula weight, stirring while adding, completing the addition within 20s, and uniformly stirring for 90 s.
2.2, pouring an anti-seepage closure underground curtain wall of the strip mine:
the mud retaining wall is used in the process of grooving the seepage-proofing cut-off curtain wall, and the specific gravity of the mud in the groove section is 1.08g/cm3About, the slurry at the bottom of the tank may reach 1.2g/cm3(ii) a Pouring according to the following steps:
step 1), after the first groove section and the second groove section are excavated, testing the width and the verticality of each groove section, and arranging a grouting pipe 2 in each groove section under the condition that the design requirements are met, wherein the distance between the bottom of each grouting pipe 2 and the bottom of each groove section is 15 cm; referring to fig. 1, a grouting pouring process of a first groove section, a second groove section or a third groove section is described, that is, before grouting, a grouting pipe 2 is arranged in a groove section 1 (the groove section 1 may be the first groove section, the second groove section or the third groove section);
and (3) conveying the prepared impermeable material prepared in the step (2.1) to the bottoms of the excavated first groove section and the second groove section through a grouting pipe (2) by a high-flow mortar pump, and meanwhile, uniformly flowing and grouting in the grooves to rise to replace slurry (3) in the groove sections to form continuous stone bodies (4 and 5).
Step 2), excavating a third groove section 7 days after the operation of the step 1), similarly to the step 1), testing the width and the verticality of the groove section after the excavation is finished, arranging a grouting pipe 2 in the groove section under the condition of meeting the design requirement, wherein the bottom of the grouting pipe is 15cm away from the bottom of the groove; and (3) conveying the seepage-proofing material prepared in the previous step (2.1) to the excavated third trough section through a pipeline by a large-flow mortar pump to replace slurry 3 in the trough section, forming a continuous stone body 6 in the third trough section, and effectively lapping with stone bodies of the first trough section and the second trough section in the step (1) to form a complete seepage-proofing closure underground curtain wall 7 of the strip mine, which is shown in figure 2. The width of each groove segment was 0.8 m.
The specific gravity of fly ash-based seepage-proofing material of seepage-proofing closure underground curtain wall of strip mine prepared by the embodiment1.54g/cm3The calculus rate is 97 percent, the 7d compressive strength is 1.6MPa, the 28d compressive strength is 4.0MPa, the 60d compressive strength is 5.3MPa, and the 90d compressive strength is 8.3MPa, the 28d anti-permeability pressure value reaches 0.3MPa, the 60d anti-permeability pressure value reaches 0.4MPa, and the 90d anti-permeability pressure value reaches 0.5 MPa.
Example 3
The anti-seepage material comprises the following raw materials in parts by weight: 40 parts of cement, 60 parts of fly ash, 2 parts of bentonite, 1.5 parts of calcium lignosulfonate and 70 parts of drinking water.
3.1, preparing the fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall of the strip mine according to the following steps:
step 1), taking drinking water and calcium lignosulphonate according to the weight of the formula, and uniformly stirring the drinking water and the calcium lignosulphonate in a slurry stirrer for 30 seconds;
step 2), weighing bentonite according to the weight of the formula, adding the bentonite into the solution stirred in the step 1), and uniformly stirring for 20 s;
and 3) respectively adding the cement and the fly ash into the mixture stirred in the step 2 according to the formula weight, stirring while adding, completing the addition within 20s, and uniformly stirring for 90 s.
3.2, pouring an anti-seepage closure underground curtain wall of the strip mine:
the mud retaining wall is used in the process of grooving the seepage-proofing cut-off curtain wall, and the specific gravity of the mud in the groove section is 1.08g/cm3About, the slurry at the bottom of the tank may reach 1.2g/cm3(ii) a Pouring according to the following steps:
step 1), after the first groove section and the second groove section are excavated, testing the width and the verticality of each groove section, and arranging a grouting pipe 2 in each groove section under the condition that the design requirements are met, wherein the distance between the bottom of each grouting pipe 2 and the bottom of each groove section is 15 cm; referring to fig. 1, a grouting pouring process of a first groove section, a second groove section or a third groove section is described, that is, before grouting, a grouting pipe 2 is arranged in a groove section 1 (the groove section 1 may be the first groove section, the second groove section or the third groove section);
and (3) conveying the prepared impermeable material prepared in the step (3.1) to the bottoms of the excavated first groove section and the second groove section through a grouting pipe 2 by a large-flow mortar pump, and meanwhile, uniformly flowing and grouting in the grooves to rise to replace slurry 3 in the groove sections to form continuous stone bodies 4 and 5.
Step 2), excavating a third groove section 7 days after the operation of the step 1), similarly to the step 1), testing the width and the verticality of the groove section after the excavation is finished, arranging a grouting pipe 2 in the groove section under the condition of meeting the design requirement, wherein the bottom of the grouting pipe is 15cm away from the bottom of the groove; and (3) conveying the seepage-proofing material prepared in the previous step (3.1) to the excavated third trough section through a pipeline by a large-flow mortar pump to replace the slurry 3 in the trough section, forming a continuous stone body 6 in the third trough section, and effectively lapping with the stone bodies of the first trough section and the second trough section in the step (1) to form a complete seepage-proofing closure underground curtain wall 7 of the strip mine, which is shown in figure 2. The width of each groove segment was 0.8 m.
The specific gravity of the fly ash-based impervious material of the impervious closure underground curtain wall of the strip mine prepared by the embodiment is 1.53g/cm3The setting rate is 98.1 percent, the 7d compressive strength is 1.1MPa, the 28d compressive strength is 2.8MPa, the 60d compressive strength is 4.2MPa, and the 90d compressive strength is 6.3MPa, the 28d impervious pressure value reaches 0.5MPa, the 60d impervious pressure value reaches 0.6MPa, and the 90d impervious pressure value reaches 0.7 MPa.
Example 4
The anti-seepage material comprises the following raw materials in parts by weight: 30 parts of cement, 70 parts of fly ash and 70 parts of drinking water.
4.1, preparing the fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall of the strip mine according to the following steps:
step 1), taking drinking water according to the weight of the formula;
and 2) respectively adding the cement and the fly ash into the mixture stirred in the step 1) according to the formula weight, stirring while adding, completing the addition within 20s, and uniformly stirring for 90 s.
4.2, pouring an anti-seepage closure underground curtain wall of the strip mine:
the mud retaining wall is used in the process of grooving the seepage-proofing cut-off curtain wall, and the specific gravity of the mud in the groove section is 1.08g/cm3About, the slurry at the bottom of the tank may reach 1.2g/cm3(ii) a Pouring according to the following steps:
step 1), after the first groove section and the second groove section are excavated, testing the width and the verticality of each groove section, and arranging a grouting pipe 2 in each groove section under the condition that the design requirements are met, wherein the distance between the bottom of each grouting pipe 2 and the bottom of each groove section is 15 cm; referring to fig. 1, a grouting pouring process of a first groove section, a second groove section or a third groove section is described, that is, before grouting, a grouting pipe 2 is arranged in a groove section 1 (the groove section 1 may be the first groove section, the second groove section or the third groove section);
and (3) conveying the prepared impermeable material prepared in the step (4.1) to the bottoms of the excavated first groove section and the second groove section through a grouting pipe 2 by a large-flow mortar pump, and meanwhile, uniformly flowing and grouting in the grooves to rise to replace slurry 3 in the groove sections to form continuous stone bodies 4 and 5.
Step 2), excavating a third groove section 7 days after the operation of the step 1), similarly to the step 1), testing the width and the verticality of the groove section after the excavation is finished, arranging a grouting pipe 2 in the groove section under the condition of meeting the design requirement, wherein the bottom of the grouting pipe is 15cm away from the bottom of the groove; and (3) conveying the seepage-proofing material prepared in the previous 4.1 steps to an excavated third groove section through a pipeline by a large-flow mortar pump to replace slurry 3 in the groove section, forming a continuous stone body 6 in the third groove section, and effectively lapping with stone bodies of the first groove section and the second groove section in the step 1) to form a complete seepage-proofing closure underground curtain wall 7 of the strip mine, wherein the integral seepage-proofing closure underground curtain wall 7 is shown in figure 2. The width of each groove segment was 0.8 m.
The specific gravity of the fly ash-based impervious material of the impervious closure underground curtain wall of the strip mine prepared by the embodiment is 1.53g/cm3The calculus rate is 98.2 percent, the 7d compressive strength is 1.42MPa, the 28d compressive strength is 3.0MPa, the 60d compressive strength is 4.5MPa, and the 90d compressive strength is 6.1MPa, the 28d anti-permeability pressure value reaches 0.1MPa, the 60d anti-permeability pressure value reaches 0.3MPa, and the 90d anti-permeability pressure value reaches 0.4 MPa.
Example 5
The anti-seepage material comprises the following raw materials in parts by weight: 50 parts of cement, 50 parts of fly ash and 70 parts of drinking water.
5.1, preparing the fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall of the strip mine according to the following steps:
step 1), taking drinking water according to the weight of the formula;
and 2) respectively adding the cement and the fly ash into the mixture stirred in the step 1) according to the formula weight, stirring while adding, completing the addition within 20s, and uniformly stirring for 90 s.
5.2, pouring an anti-seepage closure underground curtain wall of the strip mine:
the mud retaining wall is used in the process of grooving the seepage-proofing cut-off curtain wall, and the specific gravity of the mud in the groove section is 1.08g/cm3About, the slurry at the bottom of the tank may reach 1.2g/cm3(ii) a Pouring according to the following steps:
step 1), after the first groove section and the second groove section are excavated, testing the width and the verticality of each groove section, and arranging a grouting pipe 2 in each groove section under the condition that the design requirements are met, wherein the distance between the bottom of each grouting pipe 2 and the bottom of each groove section is 15 cm; referring to fig. 1, a grouting pouring process of a first groove section, a second groove section or a third groove section is described, that is, before grouting, a grouting pipe 2 is arranged in a groove section 1 (the groove section 1 may be the first groove section, the second groove section or the third groove section);
and (3) conveying the prepared impermeable material prepared in the step (5.1) to the bottoms of the excavated first groove section and the second groove section through a grouting pipe (2) by a high-flow mortar pump, and meanwhile, uniformly flowing and grouting in the grooves to rise to replace slurry (3) in the groove sections to form continuous stone bodies (4 and 5).
Step 2), excavating a third groove section 7 days after the operation of the step 1), similarly to the step 1), testing the width and the verticality of the groove section after the excavation is finished, arranging a grouting pipe 2 in the groove section under the condition of meeting the design requirement, wherein the bottom of the grouting pipe is 15cm away from the bottom of the groove; and (3) conveying the seepage-proofing material prepared in the previous 5.1 steps to an excavated third groove section through a pipeline by a large-flow mortar pump to replace slurry 3 in the groove section, forming a continuous stone body 6 in the third groove section, and effectively lapping with stone bodies of the first groove section and the second groove section in the step 1) to form a complete seepage-proofing closure underground curtain wall 7 of the strip mine, wherein the integral seepage-proofing closure underground curtain wall 7 is shown in figure 2. The width of each groove segment was 0.8 m.
The specific gravity of the fly ash-based impervious material of the impervious closure underground curtain wall of the strip mine prepared by the embodiment is 1.59g/cm3The calculus rate is 94.2 percent, the 7d compressive strength is 2.2MPa, the 28d compressive strength is 4.8MPa, the 60d compressive strength is 6.5MPa, the 90d compressive strength is 10.1MPa, and the 28d anti-permeability pressure value reachesThe anti-permeability pressure values of 0.6MPa and 60d reach 0.7MPa, and the anti-permeability pressure values of 90d reach 0.8 MPa.
Through the above embodiments, it can be found that by adopting the formula system of the invention, the silica fume, the bentonite, the sodium chloride and the calcium lignosulfonate are combined with the cement and the fly ash, and the combined action is performed, so that not only can the fly ash reach higher addition amount, but also the anti-seepage material with improved strength and anti-seepage performance can be obtained. Compared with example 1, in example 2, the strength and the impermeability are relatively poor without adding silica fume, bentonite, sodium chloride and calcium lignosulfonate; example 3 without the addition of silica fume and sodium chloride, the strength and barrier properties were also relatively poor. Example 1 and example 5 compared, an impervious intercepting underground curtain wall with better strength and impermeability was obtained with less cement and more fly ash.
It will be appreciated by those skilled in the art that modifications or adaptations to the invention may be made in light of the teachings of the present specification. Such modifications or adaptations are intended to be within the scope of the present invention as defined in the claims.
Claims (11)
1. The fly ash-based seepage-proofing material for the seepage-proofing closure underground curtain wall is characterized by comprising the following components in parts by weight:
40 parts of cement, 50-70 parts of fly ash, 5-10 parts of silica fume, 2-4 parts of bentonite, 2-3 parts of sodium chloride, 1.5-3 parts of calcium lignosulfonate and 60-70 parts of water;
the bentonite contains not less than 85 wt% of montmorillonite, and the particle size of the bentonite is not more than 200 meshes;
the fly ash is above grade II;
the silica fume accounts for more than 80 wt% with the fineness less than 1um, and the average grain diameter is 0.1-0.3 um.
2. The barrier material of claim 1, wherein the water is potable water; the fly ash accounts for 55-65 parts by weight.
3. The barrier material of claim 1, wherein the fly ash is class ii or higher power plant dry ash.
4. The barrier material of any one of claims 1 to 3, wherein the cement is portland cement, slag portland cement, pozzolan portland cement, or composite portland cement.
5. The barrier material of claim 4, wherein the cement is P-042.5 Portland cement.
6. A method of making a barrier material according to any one of claims 1 to 5, comprising the steps of:
mixing water, sodium chloride and calcium lignosulfonate, and stirring uniformly; then adding bentonite, and stirring uniformly; and adding the rest components, and uniformly stirring to obtain the fly ash-based anti-seepage material for the underground curtain wall.
7. An impervious intercepted underground curtain wall cast from the impervious material of any of claims 1 to 5.
8. The impervious intercepting underground curtain wall of claim 7, wherein the impervious intercepting underground curtain wall is an open pit impervious intercepting underground curtain wall.
9. The construction method of an impervious closure underground curtain wall according to claim 7 or 8, comprising the steps of:
1) excavating a first groove section and a second groove section, pouring impervious materials into the first groove section and the second groove section respectively, and replacing slurry in the first groove section and the second groove section; forming continuous stone bodies in the first groove section and the second groove section respectively;
2) excavating a third groove section between the first groove section and the second groove section, pouring an impermeable material into the third groove section, and replacing slurry in the third groove section; forming continuous stone bodies in the third groove section, wherein the stone bodies formed in the third groove section are respectively and mutually lapped with the stone bodies of the first groove section and the second groove section to form the seepage-proofing intercepting underground curtain wall;
the barrier material described in step 1) and step 2) is a barrier material according to any one of claims 1 to 5.
10. The construction method according to claim 9, wherein the steps 1) -2) are repeated to form more than two sections of the anti-seepage intercepting underground curtain walls which are overlapped with each other.
11. The construction method according to claim 9 or 10, wherein the step 2) is performed after the operation of the step 1) is completed for 6 to 10 days;
and/or before the impermeable material is poured into the first groove section, the second groove section or the third groove section, arranging a grouting pipe for conveying the impermeable material into the groove section in which the impermeable material needs to be poured, wherein the distance from the bottom outlet of the grouting pipe to the bottom of the groove section in which the impermeable material needs to be poured is 10-15 cm.
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| CN102503247B (en) * | 2011-09-27 | 2013-04-10 | 中国科学院武汉岩土力学研究所 | Grouting material for impervious curtain of refuse landfill and preparation method of grouting material |
| CN102701646A (en) * | 2012-01-11 | 2012-10-03 | 戴会超 | Composite wall for seepage prevention of deepwater high rockfill cofferdam |
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Effective date of registration: 20190910 Address after: 021122 Yanbei District, Dayan Town, Ewenke Banner, Hulunbeir City, Inner Mongolia Autonomous Region Applicant after: INNER MONGOLIA DA YAN MINING INDUSTRY GROUP CO., LTD. Applicant after: Xi'an Research Institute, CCTEG Address before: 021122 Yanbei District, Dayan Town, Ewenke Banner, Hulunbeir City, Inner Mongolia Autonomous Region Applicant before: INNER MONGOLIA DA YAN MINING INDUSTRY GROUP CO., LTD. |
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