CN116606108A - High-performance backfill grouting material for TBM construction of water-rich tunnel section and preparation method thereof - Google Patents
High-performance backfill grouting material for TBM construction of water-rich tunnel section and preparation method thereof Download PDFInfo
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- CN116606108A CN116606108A CN202310557377.6A CN202310557377A CN116606108A CN 116606108 A CN116606108 A CN 116606108A CN 202310557377 A CN202310557377 A CN 202310557377A CN 116606108 A CN116606108 A CN 116606108A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 239000000463 material Substances 0.000 title claims abstract description 112
- 238000010276 construction Methods 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title abstract description 14
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000004568 cement Substances 0.000 claims abstract description 33
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 22
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 22
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 63
- 239000004570 mortar (masonry) Substances 0.000 claims description 28
- 239000004793 Polystyrene Substances 0.000 claims description 27
- 239000002253 acid Substances 0.000 claims description 27
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 27
- 229920002223 polystyrene Polymers 0.000 claims description 26
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 25
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 22
- 239000004281 calcium formate Substances 0.000 claims description 22
- 229940044172 calcium formate Drugs 0.000 claims description 22
- 235000019255 calcium formate Nutrition 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 21
- 150000008130 triterpenoid saponins Chemical class 0.000 claims description 20
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 18
- 229910052791 calcium Inorganic materials 0.000 claims description 18
- 239000011575 calcium Substances 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
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- 125000000524 functional group Chemical group 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
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- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 206010053567 Coagulopathies Diseases 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
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- 238000001354 calcination Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000000701 coagulant Substances 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses a high-performance backfill grouting material for TBM construction of a water-rich tunnel section and a preparation method thereof. The high-performance backfill grouting material for TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 500-600 parts of cement, 80-100 parts of kaolin, 100-120 parts of fly ash, 250-300 parts of water, 1400-1600 parts of sand and 85-120 parts of additive. The high-performance backfill grouting material for the tunnel section TBM construction can meet the technical index requirements of the TBM bean gravel backfill grouting in the tunnel section environment, and the coal-based metakaolin and the fly ash in the grouting material are low in price, and the two are adopted to replace part of cement, so that the cost of the grouting material can be reduced, and the recycling of solid wastes can be promoted.
Description
Technical Field
The application relates to the technical field of TBM construction, in particular to a high-performance backfill grouting material for TBM construction of a water-rich tunnel section and a preparation method thereof.
Background
With the ultra-efficient tunneling of TBM (tunnel boring machine) with the shield tail clearance controlled in a smaller range, the bean gravel backfill becomes more difficult, and the bean gravel backfill grouting is not suitable for shield type TBM construction. The novel backfill grouting material can replace bean gravel backfill grouting, and provides technical support for ultra-efficient tunneling of TBM. However, the TBM construction tunnel is rich in water of different degrees in surrounding rock, and the grouting construction has more influence factors and high construction difficulty. Therefore, the TBM grouting construction of the water-rich tunnel section has the problems in 3 aspects: (1) Uneven grouting causes the uncompacted backfill layer, and local infiltration after grouting leads to the grouting material to run off seriously, and the wholeness is insufficient, and the transmission rock mass pressure effect is poor. (2) Secondary slurry supplementing is often needed, so that the prefabricated pipe piece can be damaged, the strength of the prefabricated pipe piece is reduced, and meanwhile, the maintenance cost is increased. (3) If the grouting material is long in setting time, the grouting material cannot flow into the working surface due to setting and solidification, and site construction is affected.
At present, the problems existing in the water-rich tunnel section seriously affect the progress and quality of the whole TBM construction. Along with the rapid development of tunnel and hydraulic engineering construction, the encountered engineering geological conditions are increasingly complex, the TBM backfill grouting construction of the water-rich tunnel section is more and more challenging, and the existing grouting material is difficult to meet the engineering construction requirements. Referring to cement-based grouting material technical Specification (GB/T50448) and underwater non-dispersed concrete construction technical Specification (Q/CNPC 92), and combining the shield type TBM ultra-efficient tunneling technology and the geological structure characteristics of a water-rich tunnel, the backfill grouting material needs to have the following technical effects:
(1) Suitable clotting time: the initial setting time is between 150min and 200min, and the final setting time is between 250min and 330min, so that the early stability of the segment lining can be ensured, and the grouting construction is facilitated.
(2) Good working performance: high fluidity, no layering segregation, initial fluidity of more than or equal to 250mm and water separation rate of less than or equal to 2 percent.
(3) Micro-expansion characteristics: 7d dry shrinkage is between-0.05% and 0.05%, and 28d dry shrinkage is between-0.05% and 0%, so that the grouting material can be ensured to effectively block the water-rich hole section.
(4) Good underwater non-dispersion performance: the 7d land and water strength ratio of the grouting material is more than or equal to 75 percent, and the 28d land and water strength ratio is more than or equal to 80 percent.
(5) Excellent running water dispersibility: at the flow rate of 0.2m/s, the retention rate of the grouting material is more than or equal to 75 percent so as to avoid the loss of the grouting material in the water-rich hole section.
(6) Stronger engineering adaptability: the difference value of the performance indexes of the test piece adopting the natural sand and the machine-made sand is not more than 5% of the test value of the test piece adopting the natural sand.
Patent application number CN 113735525B discloses an underwater non-dispersed grouting material for repairing pile foundation, which has higher fluidity and excellent mechanical property, and has small slump loss within 60 minutes. The coagulant of the grouting material is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, the initial setting time is more than or equal to 6 hours, and the final setting time is more than or equal to 7 hours. The grouting material has long setting time, which is unfavorable for controlling sinking and staggering of installed segments in time, and the grouting construction progress is difficult to meet the tunneling construction progress. In addition, the grouting material is not tested for water movement resistance and dispersion resistance, so the adaptability of the grouting material to a water-rich tunnel section of TBM engineering is unknown. Patent application number CN 113004003B discloses an underwater anti-dispersion mortar which has excellent underwater non-dispersion property and fluidity. The anti-dispersant of the mortar adopts water-soluble polyacrylamide, and the problems in the aspects of setting time and water movement and dispersion resistance are also solved.
The patent with application number of CN 103922659B discloses underwater anti-dispersion mortar for large-area cavity grouting, which has high fluidity, no segregation, no bleeding and higher mechanical property. The mortar thickener adopts hydroxypropyl methyl cellulose, the initial setting time is 6-7 hours, and the final setting time is 10-12 hours. The mortar has long setting time, so that the grouting construction progress is difficult to meet the tunneling construction progress. Although the mortar has certain water movement resistance and dispersion resistance, the water movement resistance and dispersion resistance of the mortar do not meet the requirements of TBM construction in a water-rich tunnel section. Patent application number CN 110950615A discloses a karst area pile foundation super-early strength underwater non-dispersion grouting material, which has the characteristics of high fluidity, super-early strength, super-high strength, good underwater non-dispersion and the like. The grouting material can increase early strength by losing the setting time, and the whole grouting construction has the working time of 2-4 hours, thereby greatly limiting the application of the grouting material in TBM construction. In addition, the flocculant of the grouting material adopts UWB-II type powder, and the water movement dispersion resistance of the flocculant also does not meet the requirements of construction in a TBM water-rich tunnel section.
Disclosure of Invention
In view of the shortcomings of the existing grouting materials, the embodiment of the application provides a high-performance backfill grouting material for TBM construction of a water-rich tunnel section and a preparation method thereof, and aims to solve the problems in the aspects of setting time and water movement resistance and dispersibility on the premise of ensuring the characteristics of high fluidity, excellent mechanical property, micro-expansion, low water separation rate and good underwater non-dispersibility of the grouting material, study the adaptability of the grouting material to natural sand and machine-made sand, and provide guarantee for ultra-efficient tunneling of the TBM of the water-rich tunnel section.
In order to achieve the purpose, the application provides a high-performance backfill grouting material for TBM construction of a water-rich tunnel section, which comprises the following raw materials in parts by weight: 500-600 parts of cement, 80-100 parts of kaolin, 100-120 parts of fly ash, 250-300 parts of water, 1400-1600 parts of sand and 85-120 parts of additive.
The cement is ordinary Portland cement (P.O42.5); the fly ash is class II and class F fly ash; the sand is coarse sand with fineness modulus of 3.5, and can be natural sand or machine-made sand.
The kaolin comprises 325-mesh coal-series metakaolin and 800-mesh coal-series metakaolin, wherein the weight part ratio of the 325-mesh coal-series metakaolin to the 800-mesh coal-series metakaolin is 1:1; compared with non-coal-series metakaolin, due to the factors of loss of hydroxyl groups, existence of a large number of broken bonds on the surface and the like, the coal-series metakaolin is formed by calcining industrial solid wastes such as coal gangue, and the like, the surface activity and the surface energy of the coal-series metakaolin are enhanced, and a certain degree of agglomeration effect can occur, so that the dynamic water dispersion resistance, the mechanical property, the water separation rate and the like of the backfill grouting material are improved.
The additive comprises an A component and a B component. The component A comprises a polycarboxylic acid composite water reducer and an expanding agent, wherein the weight part of the composite water reducer is 0.85-2.05 parts, and the weight part of the expanding agent is 60-80 parts.
The polycarboxylic acid composite water reducer comprises 0.8-2 parts by weight of polycarboxylic acid and 0.08-0.1 part by weight of triterpenoid saponin. The triterpene saponin in the compound proportion can improve the water reducing rate of the polycarboxylic acid, and the air bubbles are thinner and less in destruction, so that the flow property of the backfill grouting material can be improved, and the strength loss of a hardening body can not be caused.
The mechanism of the polycarboxylic acid composite water reducer is as follows: on one hand, polycarboxylic acid molecules are adsorbed on the surfaces of cement particles to enable the surfaces of the cement particles to have negative charges, so that electrostatic repulsion is formed, the cement particles are promoted to be mutually dispersed to destroy the structure, and the wrapped water molecules are released; on the other hand, after the triterpenoid saponin molecules are dissolved in water, the triterpenoid saponin molecules are directionally arranged on a gas-liquid interface, so that the surface tension of the grouting material is reduced, and more tiny bubbles are generated.
The swelling agent is calcium sulfoaluminate, which can reduce the dry shrinkage of the grouting material, and the mechanism is that the calcium sulfoaluminate reacts with cement hydration products such as calcium hydroxide to generate swelling ettringite (C3A.3CaSO4.32H2O).
The component B comprises carboxyl polystyrene, calcium formate and triethanolamine, wherein the weight part of the carboxyl polystyrene is 0.6-1 part, the weight part of the calcium formate is 15-25 parts, and the weight part of the triethanolamine is 2.5-4. The carboxyl polystyrene is used as a main agent of an anti-dispersing agent, and calcium formate and triethanolamine are used as auxiliary agents, so that the water movement anti-dispersion property of the backfill grouting material is improved under the synergistic effect of the three components, and the setting time of the backfill grouting material is influenced.
The carboxyl polystyrene is prepared from Phthalic Anhydride (PA) and Polystyrene (PS), has a molecular weight of 6000-10000, is different from other carboxyl polystyrene monomers, polyacrylamide, hydroxypropyl methylcellulose and other flocculating agents, has large monomer water solubility, small doping amount, shorter molecular branched chains and strong binding capacity of functional groups, ensures that the apparent viscosity of the grouting material is 40 Pa.s-60 Pa.s, ensures the water dispersion resistance of the grouting material, reduces the fluidity loss, and can weaken the effect of the carboxyl polystyrene on the setting time of the grouting material to a certain extent.
The triethanolamine is produced by reacting ethylene oxide with ammonia at 20-25 ℃ under normal pressure in the presence of ammonium bicarbonate. The activity of the triethanolamine monomer of the present application is enhanced compared to other triethanolamine produced during the reaction. Experiments show that the use effect of the triethanolamine and calcium formate combination is obviously better than that of single components with the same dosage, not only can the setting time of the grouting material be regulated and controlled, but also the water movement resistance and dispersion resistance of the grouting material can be improved.
The mechanism of the anti-dispersant: 1) The carboxyl functional groups in the molecular structure of the carboxyl polystyrene have strong adsorptivity to cement particles and hydration products to form a bridge, and the carboxyl polystyrene molecules can form a linking effect, so that the water movement resistance and the dispersion resistance of the grouting material can be improved; 2) The carboxyl polystyrene molecules enhance the adsorption effect of cement particles and hydration products on water-reducing components, and the water-flowing resistance and dispersion resistance of the grouting material are improved by increasing the viscosity of the grouting material; 3) Calcium formate and triethanolamine react with gypsum in cement to make the gypsum lose retarding effect and promote hydration hardening of backfill grouting material.
At present, no guidance is provided for the on-site preparation method of the high-performance backfill grouting material for TBM construction. Furthermore, the preparation method of the high-performance backfill grouting material provided by the application can standardize the preparation of the backfill grouting material, and the accurate selection of the stirring speed ensures that the grouting material raw materials can be stirred uniformly rapidly, and prevents the damage of chain structures and network structures with organic bridging action and linking action in the additive components so as to ensure the stability of various performance indexes of the grouting material.
The application relates to a preparation method of a high-performance backfill grouting material for TBM construction of a water-rich tunnel section, which comprises the following steps:
step (1): weighing the following raw materials in parts by weight: 500-600 parts of cement, 80-100 parts of kaolin, 100-120 parts of fly ash, 250-300 parts of water, 1400-1600 parts of sand, 0.85-2.05 parts of component A and 60-80 parts of component B;
step (2): adding one third of water, sequentially adding polycarboxylic acid, triterpenoid saponin and calcium sulfoaluminate of the additive A component into water, and stirring at a rotating speed of not more than 300r/min in a stirrer for at least 120s until stirring uniformly to obtain a A component solution;
step (3): taking the rest two thirds of water, sequentially adding the carboxyl polystyrene, calcium formate and triethanolamine of the component B of the additive into the water, and stirring for at least 120s in a stirrer at a rotating speed of not more than 120r/min until the mixture is uniformly stirred to obtain a component B solution;
step (4): adding cement, kaolin, fly ash and sand into a mortar mixer, and stirring at a rotating speed of not more than 600r/min for at least 240s until stirring uniformly;
step (5): adding the component A solution in the step (2) into a mortar stirrer, and stirring for at least 120s at a rotating speed of not more than 400r/min until stirring is uniform;
step (6): and (3) adding the component B solution in the step (3) into a mortar stirrer, and stirring at a rotating speed of not more than 240r/min for at least 240s until stirring is uniform.
All the steps are carried out under normal pressure.
The high-performance backfill grouting material for the TBM construction of the water-rich tunnel section has the beneficial effects that all indexes of the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section can meet the technical index requirements of the TBM bean gravel backfill grouting under the environment of the water-rich tunnel section. The preparation method of the application is simple and convenient to operate, and the coal series metakaolin and the fly ash in the grouting material have lower prices, and the two are adopted to replace part of cement, so that the cost of the grouting material can be reduced, and the resource utilization of solid waste can be promoted.
Detailed Description
Embodiments of the present application are described in detail below. The following examples are illustrative and are intended to be illustrative of the application and are not to be construed as limiting the application.
Example 1:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 600 parts of cement, 80 parts of kaolin, 100 parts of fly ash, 300 parts of water, 1500 parts of natural sand, 1.2 parts of polycarboxylic acid, 0.08 part of triterpenoid saponin, 70 parts of calcium sulfoaluminate, 0.8 part of carboxyl polystyrene, 20 parts of calcium formate and 3 parts of triethanolamine.
The preparation method of the grouting material comprises the following steps:
step (1): weighing the raw materials in parts by weight;
step (2): measuring 100 parts of water, sequentially adding polycarboxylic acid, triterpenoid saponin and calcium sulfoaluminate of the component A of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 300r/min for at least 120s until the mixture is uniformly stirred;
step (3): taking 200 parts of water, sequentially adding the carboxyl polystyrene, calcium formate and triethanolamine of the component B of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 120r/min for at least 120s until the mixture is uniformly stirred;
step (4): adding cement, kaolin, fly ash, sand and the like into a mortar stirrer, and stirring at least for 240s at a rotating speed of not more than 600r/min until stirring uniformly;
step (5): adding the component A solution in the step (2) into a mortar stirrer, and stirring for at least 120s at a rotating speed of not more than 400r/min until stirring is uniform;
step (6): and (3) adding the component B solution in the step (3) into a mortar stirrer, and stirring at a rotating speed of not more than 240r/min for at least 240s until stirring is uniform.
All the steps are carried out under normal pressure.
Example 2:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 550 parts of cement, 100 parts of kaolin, 120 parts of fly ash, 280 parts of water, 1400 parts of natural sand, 1.2 parts of polycarboxylic acid, 0.085 part of triterpenoid saponin, 65 parts of calcium sulfoaluminate, 0.75 part of carboxyl polystyrene, 18 parts of calcium formate and 2.8 parts of triethanolamine.
The preparation method of the grouting material comprises the following steps:
step (1): weighing the raw materials in parts by weight;
step (2): measuring 90 parts of water, sequentially adding polycarboxylic acid, triterpenoid saponin and calcium sulfoaluminate of the component A of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 300r/min for at least 120s until the mixture is uniformly stirred;
step (3): taking 190 parts of water, sequentially adding the carboxyl polystyrene, calcium formate and triethanolamine of the component B of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 120r/min for at least 120s until the mixture is uniformly stirred;
step (4): adding cement, kaolin, fly ash, sand and the like into a mortar stirrer, and stirring at least for 240s at a rotating speed of not more than 600r/min until stirring uniformly;
step (5): adding the component A solution in the step (2) into a mortar stirrer, and stirring for at least 120s at a rotating speed of not more than 400r/min until stirring is uniform;
step (6): and (3) adding the component B solution in the step (3) into a mortar stirrer, and stirring at a rotating speed of not more than 240r/min for at least 240s until stirring is uniform.
All the steps are carried out under normal pressure.
Example 3:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 500 parts of cement, 100 parts of kaolin, 100 parts of fly ash, 270 parts of water, 1600 parts of natural sand, 1.0 part of polycarboxylic acid, 0.08 part of triterpenoid saponin, 60 parts of calcium sulfoaluminate, 0.7 part of carboxyl polystyrene, 16 parts of calcium formate and 2.5 parts of triethanolamine.
The preparation method of the grouting material comprises the following steps:
step (1): weighing the raw materials in parts by weight;
step (2): measuring 90 parts of water, sequentially adding polycarboxylic acid, triterpenoid saponin and calcium sulfoaluminate of the component A of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 300r/min for at least 120s until the mixture is uniformly stirred;
step (3): taking 180 parts of water, sequentially adding the carboxyl polystyrene, calcium formate and triethanolamine of the component B of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 120r/min for at least 120s until the mixture is uniformly stirred;
step (4): adding cement, kaolin, fly ash, sand and the like into a mortar stirrer, and stirring at least for 240s at a rotating speed of not more than 600r/min until stirring uniformly;
step (5): adding the component A solution in the step (2) into a mortar stirrer, and stirring for at least 120s at a rotating speed of not more than 400r/min until stirring is uniform;
step (6): and (3) adding the component B solution in the step (3) into a mortar stirrer, and stirring at a rotating speed of not more than 240r/min for at least 240s until stirring is uniform.
All the steps are carried out under normal pressure.
Example 4:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 600 parts of cement, 80 parts of kaolin, 100 parts of fly ash, 300 parts of water, 1500 parts of machine-made sand, 1.2 parts of polycarboxylic acid, 0.08 part of triterpenoid saponin, 70 parts of calcium sulfoaluminate, 0.8 part of carboxyl polystyrene, 20 parts of calcium formate and 3 parts of triethanolamine.
The grouting material of example 4 was prepared in the same manner as in example 1.
Example 5:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 550 parts of cement, 100 parts of kaolin, 120 parts of fly ash, 280 parts of water, 1400 parts of machine-made sand, 1.2 parts of polycarboxylic acid, 0.085 part of triterpenoid saponin, 65 parts of calcium sulfoaluminate, 0.75 part of carboxyl polystyrene, 18 parts of calcium formate and 2.8 parts of triethanolamine.
The grouting material of example 5 was prepared in the same manner as in example 2.
Example 6:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 500 parts of cement, 100 parts of kaolin, 100 parts of fly ash, 270 parts of water, 1600 parts of machine-made sand, 1.0 part of polycarboxylic acid, 0.08 part of triterpenoid saponin, 60 parts of calcium sulfoaluminate, 0.7 part of carboxyl polystyrene, 16 parts of calcium formate and 2.5 parts of triethanolamine.
The grouting material of example 6 was prepared in the same manner as in example 3.
Example 7:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 500 parts of cement, 100 parts of kaolin, 100 parts of fly ash, 270 parts of water, 1600 parts of natural sand, 1.0 part of polycarboxylic acid, 0.08 part of triterpenoid saponin, 60 parts of calcium sulfoaluminate, 0.7 part of carboxyl polystyrene, 16 parts of calcium formate and 2.5 parts of triethanolamine.
Unlike the method for preparing a grouting material according to the present application, the method for preparing a grouting material comprises the steps of:
step (1): weighing the raw materials in parts by weight;
step (2): measuring 90 parts of water, sequentially adding polycarboxylic acid, triterpenoid saponin and calcium sulfoaluminate of the component A of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 200r/min for at least 120s until the mixture is uniformly stirred;
step (3): taking 180 parts of water, sequentially adding the carboxyl polystyrene, calcium formate and triethanolamine of the component B of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 80r/min for at least 120s until stirring is uniform;
step (4): adding cement, kaolin, fly ash, sand and the like into a mortar stirrer, and stirring at a rotating speed of not more than 400r/min for at least 240s until stirring is uniform;
step (5): adding the component A solution in the step (2) into a mortar stirrer, and stirring for at least 120s at a rotating speed of not more than 300r/min until stirring is uniform;
step (6): and (3) adding the component B solution in the step (3) into a mortar stirrer, and stirring for at least 240s at a rotating speed of not more than 160r/min until stirring is uniform.
All the steps are carried out under normal pressure.
Example 8:
the high-performance backfill grouting material for the TBM construction of the water-rich tunnel section comprises the following raw materials in parts by weight: 500 parts of cement, 100 parts of kaolin, 100 parts of fly ash, 270 parts of water, 1600 parts of natural sand, 1.0 part of polycarboxylic acid, 0.08 part of triterpenoid saponin, 60 parts of calcium sulfoaluminate, 0.7 part of carboxyl polystyrene, 16 parts of calcium formate and 2.5 parts of triethanolamine.
Unlike the method for preparing a grouting material according to the present application, the method for preparing a grouting material comprises the steps of:
step (1): weighing the raw materials in parts by weight;
step (2): measuring 90 parts of water, sequentially adding polycarboxylic acid, triterpenoid saponin and calcium sulfoaluminate of the component A of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 400r/min for at least 120s until the mixture is uniformly stirred;
step (3): taking 180 parts of water, sequentially adding the carboxyl polystyrene, calcium formate and triethanolamine of the component B of the additive into the water, and stirring the mixture in a stirrer at a rotating speed of not more than 200r/min for at least 120s until stirring is uniform;
step (4): adding cement, kaolin, fly ash, sand and the like into a mortar stirrer, and stirring at least for 240s at a rotating speed of not more than 600r/min until stirring uniformly;
step (5): adding the component A solution in the step (2) into a mortar stirrer, and stirring for at least 120s at a rotating speed of not more than 600r/min until stirring is uniform;
step (6): and (3) adding the component B solution in the step (3) into a mortar stirrer, and stirring at a rotating speed of not more than 400r/min for at least 240s until stirring is uniform.
All the steps are carried out under normal pressure.
The grouting materials according to examples 1 to 8 of the present application were subjected to performance index tests according to the following standard specifications, and the grouting material performance index test results are shown in the following table 1:
(1) The initial setting and final setting time of the grouting material is tested according to the standard of the common concrete mixture performance test method (GB/T50080);
(2) The fluidity and water separation rate of the grouting material are tested according to the technical Specification for cement-based grouting material application (GB/T50448);
(3) The dry shrinkage performance of the grouting material is tested according to the cement mortar dry shrinkage test method (JCT 603);
(4) The water-land strength ratio of the grouting material is tested according to the technical Specification for construction of underwater non-dispersed concrete (Q/CNPC 92);
(5) The running water resistance dispersion test of the grouting material is carried out at a flow rate of 0.2m/s, and the running water resistance dispersion is characterized by a retention rate.
TABLE 1 grouting material Performance index test results for examples 1-8
As can be seen from table 1:
the initial setting time of the grouting material in the embodiment 1-3 is 150-200 min, and the final setting time is 250-330 min; the fluidity is more than or equal to 250mm, and the water separation rate is less than or equal to 2%;7d dry shrinkage is between-0.05% and 0.05%, and 28d dry shrinkage is between-0.05% and 0%; the 7d land-water strength ratio is more than or equal to 75 percent, and the 28d land-water strength ratio is more than or equal to 80 percent; at a water flow rate of 0.2m/s, the retention rate is more than or equal to 75%. The grouting material performance indexes described in the embodiments 1-3 can meet the technical effects required by the backfill grouting material for the construction of the TBM of the water-rich tunnel section, and the grouting material adopts coal-based metakaolin and fly ash to replace part of cement, so that the cost of the grouting material can be reduced. Therefore, the application not only effectively overcomes the defects existing in the prior grouting technology, but also reduces the manufacturing cost of grouting engineering and has market popularization and application values.
The raw materials in parts by weight for examples 1 and 4, examples 2 and 5, and examples 3 and 6 are the same, except that natural sand is used for examples 1-3 and machine-made sand is used for examples 4-6. As shown in the table, the initial setting time of the grouting material in the embodiment 4-6 is 150-200 min, and the final setting time is 250-330 min; the fluidity is more than or equal to 250mm, and the water separation rate is less than or equal to 2%;7d dry shrinkage is between-0.05% and 0.05%, and 28d dry shrinkage is between-0.05% and 0%; the 7d land-water strength ratio is more than or equal to 75 percent, and the 28d land-water strength ratio is more than or equal to 80 percent; at a water flow rate of 0.2m/s, the retention rate is more than or equal to 75%. The technical indexes of the embodiments 4-6 are not more than 5% of the measured value of the embodiment of the natural sand compared with the embodiment of the natural sand which adopts the same weight parts of raw materials, and the grouting material for the TBM construction of the water-rich hole section can meet the technical effects required by the grouting material. The high-performance grouting material has strong adaptability to machine-made sand, and has popularization and application values in construction areas with shortage of natural sand resources, large usage amount and poor transportation conditions.
Examples 7 to 8 use the same raw materials and parts by weight of the raw materials as example 3, except that example 3 uses the method for preparing a high-performance backfill grouting material according to the present application, example 7 decreases the stirring speed of the admixture, and example 8 increases the stirring speed of the admixture. As can be seen from table 1: compared with example 3, the grouting materials in examples 7-8 have obvious changes in setting time, water-land strength ratio and retention rate, namely the grouting materials have prolonged setting time, and the underwater dispersion resistance and the moving water dispersion resistance are obviously reduced, so that the technical index requirements of the TBM construction of the water-rich tunnel section are difficult to meet. Therefore, the preparation method of the high-performance backfill grouting material for the construction of the TBM of the water-rich tunnel section is suitable for preparing the high-performance backfill grouting material, and can ensure the stability of the performance index of the grouting material.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the application.
Claims (10)
1. The utility model provides a rich water tunnel section TBM construction is with high performance backfill grouting material which characterized in that includes: the raw materials in parts by weight are as follows: 500-600 parts of cement, 80-100 parts of kaolin, 100-120 parts of fly ash, 250-300 parts of water, 1400-1600 parts of sand and 85-120 parts of additive.
2. The high-performance backfill grouting material for water-rich tunnel section TBM construction of claim 1, wherein the additive comprises an A component and a B component, the A component comprises a polycarboxylic acid composite water reducing agent and an expanding agent, and the B component comprises an anti-dispersant.
3. The high performance backfill grouting material for tunnel segment TBM construction according to claim 2, wherein the anti-dispersant of the B component comprises carboxyl polystyrene, calcium formate and triethanolamine.
4. The high-performance backfill grouting material for tunnel section TBM construction according to claim 3, wherein the weight part of the carboxyl polystyrene is 0.6-1 part, the weight part of calcium formate is 15-25 parts, and the weight part of triethanolamine is 2.5-4 parts.
5. The high-performance backfill grouting material for tunnel section TBM construction according to claim 2, wherein the polycarboxylic acid composite water reducing agent of the A component comprises polycarboxylic acid and triterpenoid saponin, and the expanding agent is calcium sulfoaluminate.
6. The high-performance backfill grouting material for the TBM construction of the water-rich tunnel section of claim 4, wherein the weight part of the polycarboxylic acid composite water reducing agent is 0.85-2.05 parts, the weight part of the expanding agent is 60-80 parts, the weight part of the polycarboxylic acid in the polycarboxylic acid composite water reducing agent is 0.8-2 parts, and the weight part of the triterpenoid saponin is 0.08-0.1 part.
7. The high-performance backfill grouting material for tunnel segment TBM construction according to claim 1, wherein the kaolin comprises 325 mesh coal-based metakaolin and 800 mesh coal-based metakaolin, and the weight ratio of 325 mesh coal-based metakaolin to 800 mesh coal-based metakaolin is 1:1.
8. The high-performance backfill grouting material for tunnel segment TBM construction according to claim 1, wherein the sand is coarse sand with fineness modulus of 3.5, and the sand is natural sand or machine-made sand.
9. The high-performance backfill grouting material for tunnel segment TBM construction according to claim 1, wherein the fly ash is class II F fly ash.
10. A method for preparing the high-performance backfill grouting material for TBM construction of a water-rich tunnel section according to any one of claims 2 to 9, comprising the following steps:
step (1): weighing the following raw materials in parts by weight: 500-600 parts of cement, 80-100 parts of kaolin, 100-120 parts of fly ash, 250-300 parts of water, 1400-1600 parts of sand, 0.85-2.05 parts of component A and 60-80 parts of component B;
step (2): adding one third of water, sequentially adding polycarboxylic acid, triterpenoid saponin and calcium sulfoaluminate of the additive A component into water, and stirring at a rotating speed of not more than 300r/min in a stirrer for at least 120s until stirring uniformly to obtain a A component solution;
step (3): taking the rest two thirds of water, sequentially adding the carboxyl polystyrene, calcium formate and triethanolamine of the component B of the additive into the water, and stirring for at least 120s in a stirrer at a rotating speed of not more than 120r/min until the mixture is uniformly stirred to obtain a component B solution;
step (4): adding cement, kaolin, fly ash and sand into a mortar mixer, and stirring at a rotating speed of not more than 600r/min for at least 240s until stirring uniformly;
step (5): adding the component A solution in the step (2) into a mortar stirrer, and stirring for at least 120s at a rotating speed of not more than 400r/min until stirring is uniform;
step (6): and (3) adding the component B solution in the step (3) into a mortar stirrer, and stirring at a rotating speed of not more than 240r/min for at least 240s until stirring is uniform.
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