CN112723836A - Shield excavation gap synchronous grouting slurry for water-rich silty soil stratum - Google Patents
Shield excavation gap synchronous grouting slurry for water-rich silty soil stratum Download PDFInfo
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- CN112723836A CN112723836A CN202110146569.9A CN202110146569A CN112723836A CN 112723836 A CN112723836 A CN 112723836A CN 202110146569 A CN202110146569 A CN 202110146569A CN 112723836 A CN112723836 A CN 112723836A
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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
- 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
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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 relates to shield excavation gap synchronous grouting slurry for a water-rich silty soil stratum, which is double-liquid slurry formed by mixing and stirring liquid A and liquid B, wherein the specific components of the liquid A are as follows per cubic meter: cement: 100-200 kg; fly ash: 400-600 kg; bentonite: 40-80 kg; sand: 600-800 kg; lime: 20-70 kg; water: 400-550 kg; water reducing agent: 6-9 kg; KF-A: 10-20 kg; the specific component of the liquid B is water glass solution, and the volume ratio of water glass to water is 3-4: 1; the liquid A and the liquid B are mixed and stirred according to the volume ratio of the liquid A to the liquid B of 10: 1. The synchronous grouting slurry can be widely used for silty soil layers, is not limited to pure sand pebble layers and pure clay layers, can be gelled in a very short time, and can quickly play a reinforcing effect of filling and solidifying.
Description
Technical Field
The invention relates to the field of shield tunnel construction, in particular to shield excavation gap synchronous grouting slurry for a water-rich silty soil stratum.
Background
In the shield tunneling process, in order to realize smooth turning of the shield body and prevent the shield shell from being stuck, the outer diameter difference of the cutter head, the shield body and the segment generates a certain excavation gap. The filling of the excavation gap while the shield tunneling is called synchronous grouting, and different proportions of synchronous grouting slurry can change the slurry property, thereby influencing the disturbance of the stratum and generating unfavorable ground surface settlement.
The synchronous grouting slurry has certain filling performance, proper initial setting time and good fluidity, and the synchronous grouting slurry for the water-rich stratum also has strong water retention and hydrolysis resistance. The synchronous grouting slurry widely applied to shield tunnel construction at home at present mainly comprises two types of common single-liquid slurry and double-liquid slurry added with water glass, the common single-liquid slurry is easy to separate when meeting water, and the applicability in a water-rich stratum is obviously poor; compared with single-liquid slurry, the double-liquid slurry has the characteristics of short gelling time, slightly strong waterproof performance, higher strength and durability and the like. However, the above two typical slurries still have the defects of poor waterproof performance, insufficient filling strength and the like, and particularly have higher requirements on water stopping effect and filling performance for water-rich silty clay and silty sandy soil strata, so the shield synchronous grouting slurry in the water-rich silty soil strata has the effects of short coagulation time, high strength and obvious water stopping effect.
In view of the above, the synchronous grouting slurry proportion which has high waterproof performance and strength and durability and can meet the construction requirements is provided according to the performance requirements of the synchronous grouting slurry for shield construction of the water-rich silty soil stratum under the actual engineering background.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a shield excavation gap synchronous grouting slurry for a water-powder-rich soil formation, so as to partially or completely solve the defects of the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention firstly provides a shield excavation gap synchronous grouting slurry for a water-rich silty soil stratum, which is a double-liquid slurry formed by mixing and stirring a liquid A and a liquid B, wherein the synchronous grouting slurry is prepared by mixing and stirring the liquid A and the liquid B
The liquid A comprises the following specific components in per cubic meter: cement: 100-200 kg; fly ash: 400-600 kg; bentonite: 40-80 kg; sand: 600-800 kg; lime: 20-70 kg; water: 400-550 kg; water reducing agent: 6-9 kg; KF-A: 10-20 kg;
the specific component of the solution B is sodium silicate sodium glass solution, the Baume degree of the sodium silicate sodium glass solution is not less than 45 DEG Be, and the sodium silicate sodium glass solution and the water are 3-4: 1 in volume ratio;
the liquid A and the liquid B are mixed and stirred according to the volume ratio of the liquid A to the liquid B of 10: 1.
In one embodiment, the cement is portland cement; and/or the presence of a gas in the gas,
the fly ash is II-grade ash, the fineness of the fly ash meets the requirements that the screen residue of a 0.045 mm-hole sieve is 20-45 percent, and the water content is less than or equal to 5 percent; and/or the presence of a gas in the gas,
the bentonite is sodium bentonite, the content of 200-mesh particle size exceeds 95%, and the swelling index is 12-30 ml/2 g; and/or the presence of a gas in the gas,
the sand is medium fine sand with the fineness of 0.4-1.6; and/or the presence of a gas in the gas,
the total content of effective calcium and magnesium oxide in the lime is not less than 80 percent; and/or the presence of a gas in the gas,
the water reducing agent is a common naphthalene sulfonate type water reducing agent, the water reducing rate is not lower than 25%, the hydration control time is more than 20h, and the hydrolysis degree is not higher than 30%; and/or the presence of a gas in the gas,
the KF-A is a commercially available armor Meiwich KF-A cement-based permeable crystalline cement catalyst.
In one embodiment, the initial setting time of the double-liquid slurry is 10-35 s, the slump constant in 4 hours is not lower than 23cm, the slump constant in 10 hours is not lower than 18cm, the fluidity in 8 hours is not lower than 230mm, and the impermeability grade reaches P12.
The invention further provides a synchronous grouting system, which comprises a first grouting pipeline 100, a second grouting pipeline 200, a mixing and stirring pump 300 and a main grouting pipeline 400, wherein the main grouting pipeline 400 is connected with the first grouting pipeline 100 and the second grouting pipeline 200 in sequence
The first grouting pipeline 100 is communicated with the mixing and stirring pump 300, and a first grouting pump 101 is arranged in the first grouting pipeline 100 and used for conveying grout A to the mixing and stirring pump 300;
the second grouting pipeline 200 is communicated with the mixing and stirring pump 300, and a second grouting pump 201 is arranged in the second grouting pipeline 200 and used for conveying the grout B to the mixing and stirring pump 300;
the mixing and stirring pump 300 is connected with the main grouting pipeline 400 and is used for mixing and stirring the grout A and the grout B uniformly to form double-grout and pumping the double-grout to the main grouting pipeline 400;
the main grouting pipeline 400 is communicated with an excavation gap between a shield tunnel segment and a soil layer, a first water stop valve 401 is connected into the main grouting pipeline 400, and double grout can be injected into the excavation gap when the first water stop valve 401 is in an open state.
In one embodiment, the mixing and stirring pump 300 has a first inlet 301, a second inlet 302 and a slurry outlet 303, wherein the first inlet 301 is connected to the first grouting pipe 100, the second inlet 302 is connected to the second grouting pipe 200, and the slurry outlet 303 is connected to the main grouting pipe 400.
In one embodiment, the system further comprises a flushing pipeline 500, the flushing pipeline 500 is communicated with the main grouting pipeline 400, a water suction pump 501 and a second water stop valve 502 are connected in the flushing pipeline 500, and flushing water can be delivered to the mixing and stirring pump 300, the first grouting pipeline 100 and the second grouting pipeline 200 to flush the pipelines when the second water stop valve 502 is opened.
In one embodiment, the flush line 500 communicates with the main grouting line 400 at a location between the discharge port 303 of the mixer-agitator pump 300 and the first stop valve 401.
In one embodiment, the second stop valve 502 is disposed at the intersection of the flush line 500 and the main grouting line 400.
The invention also provides a synchronous grouting method, which comprises the following steps:
s10, preparation of solution A:
s101, grouping the components: taking fly ash and sand as a first group, cement, bentonite and lime as a second group, taking 70-80% of water as a third group, taking a water reducing agent, KF-A and 20-30% of water as a fourth group, and respectively measuring four groups of components according to a design proportion for later use;
s102, putting the first group, putting the fly ash and the sand into a stirring tank, and uniformly stirring while putting;
s103, putting a second group, putting cement, bentonite and lime into a stirring tank, and stirring uniformly while putting to form a uniformly mixed dry material mixture;
s104, putting a third group, adding 70-80% of water into the stirring tank, and continuously stirring for no more than 20min until the mixture is uniformly stirred to form uniformly mixed slurry;
s105, mixing a fourth group, namely adding the water reducing agent and KF-A into 20-30% of water to be uniformly mixed to form an additive solution;
s106, putting a fourth group, adding the additive solution into the slurry in the stirring tank, continuously stirring until the slurry is uniformly stirred to form slurry, and continuously stirring;
s20, preparing liquid B:
adding water into sodium silicate glass stock solution according to a designed proportion to adjust the sodium silicate glass stock solution into a sodium silicate glass solution;
s30, opening the first water stop valve 401, closing the second water stop valve 502, and delivering the liquid a to the mixing and stirring pump 300 through the first grouting pipe 100, and delivering the liquid B to the mixing and stirring pump 300 through the second grouting pipe 200;
s40, mixing and stirring the solution A and the solution B uniformly by a mixing and stirring pump 300 to form double-fluid slurry, and then injecting the double-fluid slurry into an excavation gap between shield tunnel segments and a soil layer under pressure.
In one embodiment, the method further comprises the steps of: s50, closing the first stop valve 401, opening the second stop valve 502, and the flushing pipeline 500 delivering flushing water to flush the pipeline through the mixing and stirring pump 300, the first grouting pipeline 100, and the second grouting pipeline 200.
Compared with the prior art, the invention has the beneficial effects that: the synchronous grouting slurry for the shield excavation gap of the water-rich silty soil stratum is not clear aiming at the defect of qualitative consideration of silty soil between sandy soil and cohesive soil in the current actual construction, gives consideration to the characteristics of the slurries of the sandy soil and the cohesive soil, can be widely applied to the silty soil stratum, has more reasonable component proportion and moderate consistency and fluidity, can well flow into pores of the silty soil stratum, plays a good role in blocking, compacting and reinforcing, and does not need to have the filling amount as large as that of a pure sandy soil stratum. The double-liquid slurry can be gelled in a very short time, the reinforcing effect of filling and solidifying is rapidly achieved, and the early strength (3-7 days) of common slurry can be achieved 1-2 days in advance; after KF-A and cement particles are added and mixed, the superfine cement particles obtained by cracking in a short time are distributed to compact space gaps, the compactness and the waterproof effect of the cement can be greatly improved, the impermeability of the solidified slurry is high, the slurry can have certain acid-base and chloride ion corrosion resistance, and the underground water is free of pollution. The synchronous grouting system used in a matched manner is simple and practical in structure and is not easy to block pipes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, shall fall within the scope covered by the technical contents disclosed in the present invention.
FIG. 1 is a schematic flow chart of a synchronous grouting method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a process for preparing solution A according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a synchronous grouting system according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It is to be understood that the terms "comprises/comprising," "consisting of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method if desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," or "comprising" does not exclude the presence of other like elements in a product, device, process, or method that comprises the element.
It will be further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present invention and to simplify description, and do not indicate or imply that the referenced device, component, or structure must have a particular orientation, be constructed in a particular orientation, or be operated in a particular manner, and should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The synchronous grouting slurry in the current shield tunneling process is mostly suitable for a certain specific stratum, such as: water-rich sand layers, cohesive soil layers, and the like. For sandy soil stratum, the mortar has the characteristics of large porosity, high permeability coefficient, easy collapse and deformation and the like, the thick liquid with large consistency and good fluidity is used in the synchronous grouting process to ensure that the thick liquid can permeate into the surface of sandy soil to play a role in reinforcement, meanwhile, the mortar has certain strength after permeation, and the thick liquids which are suitable for the sandy soil stratum and have different proportions are balanced by the flowing permeability and the early strength after permeation. And the cohesive soil stratum is high in particle density, so that the problem that the slurry needs to permeate into the soil layer is basically not considered, the slurry with low consistency and high early strength is directly used, and the filling effect is exerted to the earliest extent.
In fact, the characteristics of short initial setting time, high strength and good water stopping effect are expected to be possessed by any stratum filling slurry, but considering the penetration and diffusion of the slurry, the slurry possessed by each stratum needs to consider the consistency, the fluidity, the early strength, the fluidity diffusion and the like, and the complex proportioning process is realized. For example, the permeability and early strength after permeability are strictly considered in sandy soil formations, and in practical engineering, according to construction experience, the dosage of cement is increased for slurry of the sandy soil formations, but sand and stone materials are not basically used, because sand and stone particles influence slurry permeation due to large particle size, and good fluidity and permeability are ensured, and the specific strength can be achieved at the first time after the sand and stone particles permeate the formations. On the contrary, the clay stratum almost does not need to consider the permeation process, so the slurry filling effect with high viscosity, quick initial setting time and rapid strength increase is better.
However, the stratum penetrated in the actual shield construction process is complex and not single, even a certain section stratum penetrated only can be subdivided into silty clay, viscous silty soil, sandy silty soil, medium-fine silt and the like, the transition zone soil layer property of each stratum is not described well, the slurry proportioning performed according to the sandy soil stratum or the viscous soil stratum is not suitable, and the slurry proportioning of the sandy soil stratum or the viscous soil stratum is not suitable for the section stratum.
The invention provides a 'silty soil' stratum with a larger coverage area, which specifically comprises the following steps: silty clay, sandy silty soil, sticky silty soil, fine silt and the like. The invention is unified as 'silty soil', and the 'silty soil' is roughly defined as follows: plasticity index of 10 ≥ Ip>3, the grain groups of 0.05-0.1 mm and 0.005-0.05 mm in the grain size components account for the majority, the action between water and soil grains is obviously different from that between clay and sandy soil, and the permeability coefficient is 6 multiplied by 10-5～6×10-3cm/s. The 'silty soil' has the following characteristics: permeability is not easily described (sandy silt permeability is relatively large, and silty clay permeability is small, but overall permeability is between that of sand and pure clay), low plasticity (or pseudoplasticity, with the duality of sandy soil and clay), lack of toughness, obvious susceptibility to vibration and liquefaction, low strength, susceptibility to deformation by disturbance, and the like. Especially, when the shield penetrates through an underground pile foundation structure and the like, the bad properties of the silty soil, such as plasticity, low strength, easy liquefaction and the like, are the keys for increasing the risk.
The synchronous grouting slurry for the silty soil between sandy soil and cohesive soil in the actual construction at present is not very clear, the silty soil is between a sandy soil stratum and a cohesive soil stratum, the partial permeation of the slurry is considered, the early strength is improved as fast as possible to achieve a good filling effect, and therefore the proportioning of the slurry material is more considering factors than the slurries of the two stratums and is more complex.
The invention provides a shield excavation gap synchronous grouting slurry for a water-rich silty soil stratum, which is a double-liquid slurry formed by mixing and stirring a liquid A and a liquid B, wherein the synchronous grouting slurry is prepared by mixing and stirring the liquid A and the liquid B
The liquid A comprises the following specific components in per cubic meter: cement: 100-200 kg; fly ash: 400-600 kg; bentonite: 40-80 kg; sand: 600-800 kg; lime: 20-70 kg; water: 400-550 kg; water reducing agent: 6-9 kg; KF-A: 10-20 kg;
the specific component of the solution B is sodium silicate sodium glass solution, the Baume degree of the sodium silicate sodium glass solution is not less than 45 DEG Be, and the sodium silicate sodium glass solution and the water are 3-4: 1 in volume ratio;
the liquid A and the liquid B are mixed and stirred according to the volume ratio of the liquid A to the liquid B of 10: 1.
The cement used for preparing the slurry is ordinary Portland cement; the fly ash is II-grade ash, the fineness of the fly ash meets the requirements that the screen residue of a 0.045mm hole sieve is 20-45 percent, and the water content is less than or equal to 5 percent; the bentonite is sodium bentonite, the content of 200-mesh particle size exceeds 95%, the swelling index is 12-30 ml/2g, the stability of the slurry can be improved due to the existence of fine particles, the sliding effect is provided, and the fluidity of the slurry is enhanced; the sand is medium fine sand with the fineness of 0.4-1.6; the total content of effective calcium and magnesium oxide in lime is not less than 80%; the water reducing agent is a common naphthalene sulfonate type water reducing agent, the water reducing rate is not lower than 25%, the hydration control time is more than 20h, and the hydrolysis degree is not higher than 30%; KF-A is a commercially available armor Meichuang KF-A cement-based permeable crystalline cement catalyst; sodium silicate water glass has chemical formula of Na2SiO3·9H2And O, in order to achieve good coagulation effect of the mixed slurry, the baume degree of the sodium silicate water glass solution is not less than 45 DEG Be.
The main effect of adding the water reducing agent into the slurry is to adjust the setting time of the slurry, and the main effect of adding the water glass is to shorten the initial setting time of the slurry, and experiments show that the initial setting time of the slurry is about 10-35 s, namely the slurry can be gelled in a very short time.
Besides the water reducing agent and the water glass, the main components of the double-liquid slurry are added with a novel catalyst: the armor Mei Chuang KF-A and the KF-A are commercially available armor Mei Chuang KF-A cement-based permeable crystalline cement catalysts, are powdery solid materials which can be directly added into cement, can generate unique chemical change and physical action after being mixed with cement particles, when the cement doped with the KF-A is subjected to hydration, 90 mu m cement particles can be cracked into 16 mu m ultrafine cement particles within 4-6 hours, compared with the time required for cracking the 90 mu m cement particles into the 16 mu m ultrafine cement particles in common slurry, the time required for cracking the 90 mu m cement particles into the 16 mu m ultrafine cement particles in the common slurry is more than 10 hours, the ultrafine cement particles in the common slurry are not completely cracked in the same time, the cracking degree is low, the compactness and the waterproofness of the cement are poor, and the effect in actual engineering is not ideal. The superfine cement particles obtained by cracking in a short time are distributed and compact space gaps, the compactness and the waterproof effect of the cement can be greatly improved, and the initial setting time of the normal synchronous grouting slurry is about 4 hours, so that the cracking process and the condensation process of the cement particles of the double-liquid slurry are carried out simultaneously, and the full cracking process of a catalyst is ensured, and the hydration effect of the cement is not influenced.
Since the liquid A and the liquid B are gelled in a very short time (about 10-35 s) after being mixed, the very short time does not meet the condition of pre-mixing and only can be mixed at the moment of grouting, two kinds of slurry are prepared and respectively conveyed during grouting, and the slurry is immediately injected into an excavation gap after being mixed, as shown in figure 3.
The slump range of the prepared AB mixed slurry is 20-30 cm, the initial setting time is 10-35 s, and the prepared AB mixed slurry has the following properties:
(1) the early strength of the common slurry can be reached 1 to 2 days in advance (3 to 7 days).
(2) The impermeability grade of the solidified slurry can reach P12, while the impermeability grade of the common slurry can only reach P6-P8.
(3) The slurry has certain acid, alkali and chloride ion resisting capacity, and may be used in sea water stratum or polluted stratum. The polluted stratum has certain acidity and alkalinity, the seawater stratum is rich in chloride ions, and the common cement is Ca (OH) in the gelling process2The formation of (2) causes the cement to present a certain alkalinity, so that the acid resistance of the cement is poor. The slurry has high compactness and reduced water contentThe contact area further plays a certain role in resisting acid-base and chloride ion corrosion, so that the slurry has certain advantages in the application of the two formations.
(4) The cement, the mortar, the water reducing agent and the catalyst are pollution-free materials, and have no pollution to underground water, so that the slurry used in the construction of urban subway tunnels does not influence the surrounding drinking water quality.
The preparation method of the slurry is simple, the quality of the slurry is easy to control, no pollution is caused, and good engineering benefit and environmental benefit are achieved.
The specific embodiment is as follows:
example 1: slurry ratio (kg/m3) in shield launching and receiving stage
Liquid A-cement: 100, respectively; fly ash: 412; bentonite: 48; sand: 620; lime: 20; water: 480; water reducing agent: 8; KF-A: 10;
liquid B-water glass solution, which satisfies the volume ratio of liquid A: solution B is 10: 1;
the initial setting time of the double-slurry is 20-35 s, the slump in 4 hours is not lower than 23cm, the slump in 10 hours is not lower than 18cm, and the fluidity in 8 hours is not lower than 230 mm.
Example 2: slurry ratio of powder clay section for shield tunneling (kg/m3)
Liquid A-cement: 100, respectively; fly ash: 503; bentonite: 48; sand: 751; lime: 60, adding a solvent to the mixture; water: 520, respectively; water reducing agent: 8; KF-A: 15;
liquid B-water glass solution, which satisfies the volume ratio of liquid A: solution B is 10: 1;
the initial setting time of the double-slurry is 15-25 s, the initial slump is 25 +/-1 cm, the slump is not lower than 23cm within 4 hours, the slump is not lower than 18cm within 10 hours, and the fluidity is not lower than 230mm within 8 hours.
Example 3: slurry ratio of shield tunneling powder sand section (kg/m3)
Liquid A-cement: 140 of a solvent; fly ash: 550; bentonite: 65; sand and stone: 650; lime: 50; water: 550; water reducing agent: 9; KF-A: 10;
liquid B-water glass solution, which satisfies the volume ratio of liquid A: solution B is 10: 1;
the initial setting time of the double-slurry is 10-25 s, the initial slump is 25 +/-1 cm, the slump in 4 hours is not lower than 24cm, the slump in 10 hours is not lower than 19cm, and the fluidity in 8 hours is not lower than 230 mm.
Example 4: slurry ratio of tunnel connecting channel section (kg/m3)
Liquid A-cement: 100, respectively; fly ash: 572; bentonite: 55; sand: 605; lime: 35; water: 520, respectively; water reducing agent: 8; KF-A: 10;
liquid B-water glass solution, which satisfies the volume ratio of liquid A: solution B is 10: 1;
the initial setting time of the double-slurry is 20-35 s, the initial slump is 25 +/-2 cm, the slump is not lower than 24cm within 4 hours, the slump is not lower than 20cm within 10 hours, and the fluidity is not lower than 230mm within 8 hours.
Comparative example:
cement as single-fluid slurry in a common water-rich sand soil layer: 140 of a solvent; fly ash: 370; bentonite: 90, respectively; sand: 405; water: 480.
cement as single-fluid slurry of a common water-rich clay layer: 100, respectively; fly ash: 550; bentonite: 40; sand: 820; water: 520.
the proportioning conditions of the slurry and the common slurry in the embodiment of the invention are compared as follows:
table 1 mass ratio of each slurry ratio
By comparing the proportion of the 4 kinds of slurry with the proportion of the two groups of common slurry, the content of the cement and the bentonite in the slurry suitable for the sandy soil stratum is slightly high, and the content of the sand is slightly low; the slurry applicable to clay formations has low cement content but high sand content.
The proportion of the 4 groups of slurry is between the two groups of slurry, the property of the slurry is not like that of slurry suitable for sandy soil which needs a large amount of cement to permeate and reinforce pores, nor like that of slurry suitable for clay which needs higher sand content, the component proportion is more reasonable, the slurry characteristics of sandy soil and cohesive soil can be considered, and the slurry is widely suitable for silty soil with the characteristic of being in the middle of the two types of soil.
The properties of each slurry were further compared as follows:
TABLE 2 comparison of Properties of the slurries
From the comparison of the properties of the slurries of the respective groups of table 2, it can be found that: the sandy soil stratum slurry has the consistency of more than 11.9cm after 1 hour, the initial slump of only about 20cm, the slump of more than 15cm after 4 hours, the fluidity of more than 280mm after 8 hours, and the sandy soil stratum slurry has high consistency and good fluidity; and the clay stratum slurry has the consistency of 5-6.6 cm within 1 hour, the initial slump reaches 34cm, the slump within 4 hours is more than 25cm, the fluidity within 8 hours is only 180mm, and the clay stratum slurry has low consistency and poor fluidity.
The proportion of the components of the double-fluid slurry is different from that of slurry of a pure sand stratum and a clay stratum, and the two characteristics of sandy soil and clay are mainly considered, the consistency of the double-fluid slurry is 8-10 cm within 1h, the initial slump is about 25cm, the slump is more than 23cm within 4h, and the fluidity exceeds 230mm within 8 h.
In addition, the initial setting time of the double-liquid slurry is 10-35 s, and is obviously faster than the initial setting time of the common single-liquid slurry of more than 5h, so that the double-liquid slurry can quickly perform penetration consolidation on the excavated gap, and has the effect of quick grouting reinforcement.
The synchronous grouting system for the dual-fluid slurry matching use of the present invention will be specifically described with reference to fig. 3.
A synchronous grouting system, as shown in fig. 3, comprises a first grouting pipeline 100, a second grouting pipeline 200, a mixing and stirring pump 300, a main grouting pipeline 400 and a flushing pipeline 500, wherein
The first grouting pipeline 100 is communicated with the mixing and stirring pump 300, and a first grouting pump 101 is arranged in the first grouting pipeline 100 and used for conveying grout A to the mixing and stirring pump 300;
the second grouting pipeline 200 is communicated with the mixing and stirring pump 300, and a second grouting pump 201 is arranged in the second grouting pipeline 200 and used for conveying the grout B to the mixing and stirring pump 300;
the mixing and stirring pump 300 is connected with the main grouting pipeline 400 and is used for mixing and stirring the grout A and the grout B uniformly to form double-grout and pumping the double-grout to the main grouting pipeline 400;
the main grouting pipeline 400 is communicated with an excavation gap between a shield tunnel segment and a soil layer, a first water stop valve 401 is connected into the main grouting pipeline 400, and double grout can be injected into the excavation gap when the first water stop valve 401 is in an open state.
As mentioned above, the liquid A and the liquid B are mixed and then gelated in a very short time (about 10-35 s), and the very short time does not meet the condition of pre-mixing and only can be mixed and injected at the moment.
Specifically, the mixer-agitator pump 300 has a first inlet 301, a second inlet 302, and a slurry outlet 303, the first inlet 301 being connected to the first grouting pump 101, the second inlet 302 being connected to the second grouting pump 201, and the slurry outlet 303 being connected to the main grouting pipe 400.
In order to prevent grout from coagulating and blocking the pipeline, the invention is also provided with a flushing pipeline 500, the flushing pipeline 500 is communicated with the grouting main pipeline 400, a water suction pump 501 and a second water stop valve 502 are connected in the flushing pipeline 500, and flushing water can be conveyed to the mixing and stirring pump 300, the first grouting pipeline 100 and the second grouting pipeline 200 to flush the pipelines when the second water stop valve 502 is opened.
Specifically, the flushing pipe 500 is communicated with the main grouting pipe 400 at a position between the slurry outlet 303 of the mixing and stirring pump 300 and the first water stop valve 401.
Specifically, a second water stop valve 502 is connected at the intersection of the flushing pipeline 500 and the main grouting pipeline 400.
Because the initial setting time of the A, B liquid after mixing is greatly shortened, the flushing water pipeline provided by the invention has the function of flushing the residual coagulated slurry in the pipeline so as to prevent the slurry from coagulating and blocking the pipeline.
Referring to fig. 1-2, the synchronous grouting method using the synchronous grouting system of the present invention is as follows:
preparing a solution A:
in order to ensure that all raw materials can be uniformly distributed so as to ensure that all parts can obtain chemical reactions of the same degree, the components are grouped, and in terms of the content of dry materials, when the dry materials are added, the stirring effect of adding the components with less dry materials to the components with more dry materials and then stirring is better. As the liquid A component contains more fly ash and sand and less cement, bentonite and lime, the fly ash and the sand are divided into a first group and the cement, the bentonite and the lime are divided into a second group.
In addition, for wet materials containing water and the additive, if all the water is added after the dry materials are added, and the additive is finally added, the viscosity degree of the slurry after the water is added is obviously increased compared with that of the water, and the dissolution degree of the additive in the more viscous slurry is obviously not as good as that in the water; inadequate premixing of the dry ingredients can also occur if the admixture is dissolved in all of the water and then all of the water is added to the dry ingredients for mixing. Therefore, the invention divides the water into two parts, one part is used for fully mixing the dry materials, and the other part is used for dissolving the admixture. In consideration of the content ratio of dry materials to wet materials in the whole components, 70-80% of water is used for mixing the dry materials, 70-80% of water is used as a third group, 20-30% of water is used for mixing the wet materials, and the water reducing agent, KF-A and 20-30% of water are used as a fourth group, so that the whole slurry can be more fully and uniformly mixed and stirred.
After the grouping, 4 bucket scales are prepared, and four groups of components are respectively measured according to the designed proportion for standby.
Firstly, a first group is put in, the fly ash and sand with the most content are put in a stirring tank, and the mixture is stirred uniformly while being put in.
Then putting a second group, putting cement, bentonite and lime into a stirring tank, and stirring uniformly while putting to form a uniformly mixed dry material mixture; stirring is continuously carried out in the feeding process so as to ensure that the dry materials can be fully and uniformly mixed.
And after the dry materials are fully and uniformly stirred, putting a third group, adding 70-80% of water into the stirring tank, continuously stirring to form uniformly mixed slurry, continuously stirring in the whole pouring process to prevent the cementing material from being coagulated into blocks, wherein the stirring time at the stage cannot be too long, otherwise the slurry can be coagulated to a certain extent to influence the slurry effect.
And mixing the fourth group, namely adding the water reducing agent and KF-A into 20-30% of water and uniformly mixing to form an additive solution.
And finally, putting the fourth group, adding the uniformly mixed additive solution into the slurry in the stirring tank, and continuously stirring until the slurry is uniformly stirred to form slurry, and continuously stirring until the stirring cannot be stopped before the slurry is mixed with the liquid B.
Preparing a solution B:
adding water into the sodium silicate sodium glass stock solution according to the designed proportion to adjust the sodium silicate sodium glass stock solution into a sodium silicate sodium glass solution.
The above description is merely a description of the order of characters, and the preparation of the solution a and the solution B is not strictly limited in the order of the order.
During grouting, the first water stop valve 401 is opened, the second water stop valve 502 is closed, the first grouting pipeline 100 conveys the liquid A to the mixing and stirring pump 300, and meanwhile the second grouting pipeline 200 conveys the liquid B to the mixing and stirring pump 300;
the mixing and stirring pump 300 uniformly mixes and stirs the solution A and the solution B to form a double-fluid slurry, and then the double-fluid slurry is injected into an excavation gap between a shield tunnel segment and a soil layer under pressure.
Further, after grouting is completed, pipeline flushing is performed, the first water stop valve 401 is closed, the second water stop valve 502 is opened, flushing water is conveyed by the flushing pipeline 500 to pass through the mixing and stirring pump 300, the first grouting pipeline 100 and the second grouting pipeline 200 so as to flush the pipelines, and residual slurry in the pipelines is prevented from being condensed to block the pipelines.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations and modifications can be made, which are consistent with the principles of the invention, from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. The synchronous grouting slurry for the shield excavation gap of the water-rich silty soil stratum is characterized in that the synchronous grouting slurry is double-liquid slurry formed by mixing and stirring liquid A and liquid B, wherein the double-liquid slurry is formed by mixing and stirring liquid A and liquid B
The liquid A comprises the following specific components in per cubic meter: cement: 100-200 kg; fly ash: 400-600 kg; bentonite: 40-80 kg; sand: 600-800 kg; lime: 20-70 kg; water: 400-550 kg; water reducing agent: 6-9 kg; KF-A: 10-20 kg;
the specific component of the solution B is sodium silicate sodium glass solution, the Baume degree of the sodium silicate sodium glass solution is not less than 45 DEG Be, and the sodium silicate sodium glass solution and the water are 3-4: 1 in volume ratio;
the liquid A and the liquid B are mixed and stirred according to the volume ratio of the liquid A to the liquid B of 10: 1.
2. The simultaneous grouting slurry according to claim 1, characterized in that:
the cement is ordinary portland cement; and/or the presence of a gas in the gas,
the fly ash is II-grade ash, the fineness of the fly ash meets the requirements that the screen residue of a 0.045 mm-hole sieve is 20-45 percent, and the water content is less than or equal to 5 percent; and/or the presence of a gas in the gas,
the bentonite is sodium bentonite, the content of 200-mesh particle size exceeds 95%, and the swelling index is 12-30 ml/2 g; and/or the presence of a gas in the gas,
the sand is medium fine sand with the fineness of 0.4-1.6; and/or the presence of a gas in the gas,
the total content of effective calcium and magnesium oxide in the lime is not less than 80 percent; and/or the presence of a gas in the gas,
the water reducing agent is a common naphthalene sulfonate type water reducing agent, the water reducing rate is not lower than 25%, the hydration control time is more than 20h, and the hydrolysis degree is not higher than 30%; and/or the presence of a gas in the gas,
the KF-A is a commercially available armor Meiwich KF-A cement-based permeable crystalline cement catalyst.
3. The simultaneous grouting slurry according to claim 1 or 2, characterized in that:
the initial setting time of the double-fluid slurry is 10-35 s, the slump constant in 4 hours is not lower than 23cm, the slump constant in 10 hours is not lower than 18cm, the fluidity in 8 hours is not lower than 230mm, and the anti-permeability grade reaches P12.
4. A simultaneous grouting system for simultaneous grouting of slurry according to claims 1-3, characterized in that: comprises a first grouting pipeline (100), a second grouting pipeline (200), a mixing and stirring pump (300) and a main grouting pipeline (400), wherein
The first grouting pipeline (100) is communicated with the mixing and stirring pump (300), and a first grouting pump (101) is arranged in the first grouting pipeline (100) and used for conveying the grout A to the mixing and stirring pump (300);
the second grouting pipeline (200) is communicated with the mixing and stirring pump (300), and a second grouting pump (201) is arranged in the second grouting pipeline (200) and used for conveying the grout B to the mixing and stirring pump (300);
the mixing and stirring pump (300) is connected with the main grouting pipeline (400) and is used for mixing and stirring the grout A and the grout B uniformly to form double-grout and pumping the double-grout to the main grouting pipeline (400);
grouting main pipeline (400) intercommunication shield tunnel section of jurisdiction and the excavation clearance between the soil layer are connected with first stagnant water valve (401) in grouting main pipeline (400), under first stagnant water valve (401) open mode, can pour into the biliquid thick liquid into the excavation clearance.
5. The simultaneous grouting system of claim 4, wherein:
the mixing and stirring pump (300) is provided with a first inlet (301), a second inlet (302) and a slurry outlet (303), the first inlet (301) is connected with the first grouting pipeline (100), the second inlet (302) is connected with the second grouting pipeline (200), and the slurry outlet (303) is connected with the main grouting pipeline (400).
6. The simultaneous grouting system of claim 5, wherein:
still include flushing pipe way (500), flushing pipe way (500) intercommunication slip casting main line (400) is connected with suction pump (501) and second stagnant water valve (502) in flushing pipe way (500), and under second stagnant water valve (502) open mode, can carry the flushing water in order to wash the pipeline to mixing agitator pump (300), first slip casting pipeline (100), second slip casting pipeline (200).
7. The simultaneous grouting system of claim 6, wherein:
the flushing pipeline (500) is communicated with a position, located between the slurry outlet (303) of the mixing and stirring pump (300) and the first water stop valve (401), of the main grouting pipeline (400).
8. The simultaneous grouting system of claim 7, wherein:
the second water stop valve (502) is arranged at the junction of the flushing pipeline (500) and the grouting main pipeline (400).
9. A simultaneous grouting method using the simultaneous grouting system according to claims 4 to 8, comprising the steps of:
s10, preparation of solution A:
s101, grouping the components: taking fly ash and sand as a first group, cement, bentonite and lime as a second group, taking 70-80% of water as a third group, taking a water reducing agent, KF-A and 20-30% of water as a fourth group, and respectively measuring four groups of components according to a design proportion for later use;
s102, putting the first group, putting the fly ash and the sand into a stirring tank, and uniformly stirring while putting;
s103, putting a second group, putting cement, bentonite and lime into a stirring tank, and stirring uniformly while putting to form a uniformly mixed dry material mixture;
s104, putting a third group, adding 70-80% of water into the stirring tank, and continuously stirring for no more than 20min until the mixture is uniformly stirred to form uniformly mixed slurry;
s105, mixing a fourth group, namely adding the water reducing agent and KF-A into 20-30% of water to be uniformly mixed to form an additive solution;
s106, putting a fourth group, adding the additive solution into the slurry in the stirring tank, continuously stirring until the slurry is uniformly stirred to form slurry, and continuously stirring;
s20, preparing liquid B:
adding water into sodium silicate glass stock solution according to a designed proportion to adjust the sodium silicate glass stock solution into a sodium silicate glass solution;
s30, opening the first water stop valve (401), closing the second water stop valve (502), and conveying the liquid A to the mixing and stirring pump (300) through the first grouting pipeline (100) and conveying the liquid B to the mixing and stirring pump (300) through the second grouting pipeline (200);
and S40, mixing and stirring the solution A and the solution B uniformly by a mixing and stirring pump (300) to form double-fluid slurry, and then injecting the double-fluid slurry into an excavation gap between shield tunnel segments and a soil layer under pressure.
10. The simultaneous grouting method according to claim 9, characterized in that: further comprising the steps of:
s50, closing the first water stop valve (401), opening the second water stop valve (502), and conveying flushing water by the flushing pipeline (500) to flush the pipeline through the mixing and stirring pump (300), the first grouting pipeline (100) and the second grouting pipeline (200).
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