CN112110682A - High-efficiency plugging film-forming shield slurry material for emergency - Google Patents
High-efficiency plugging film-forming shield slurry material for emergency Download PDFInfo
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- CN112110682A CN112110682A CN202010797390.5A CN202010797390A CN112110682A CN 112110682 A CN112110682 A CN 112110682A CN 202010797390 A CN202010797390 A CN 202010797390A CN 112110682 A CN112110682 A CN 112110682A
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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
- C04B28/001—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 unburned clay
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- 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
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
Abstract
The invention discloses a high-efficiency plugging film-forming shield slurry material for emergency, which comprises the following components in percentage by weight: 70-80% of bentonite, 10-15% of polymer coating material, 5-10% of colloid enhancer, 1-3% of polymer dispersant and 1-3% of emulsifier. According to the invention, the polymer wrapping material and the bentonite are combined in water to form the elastic particles, so that the slurry prepared from the high-efficiency plugging film-forming shield slurry material for emergency can effectively plug the formation pores, and the stability of an excavation surface is improved.
Description
Technical Field
The invention relates to the technical field of shield construction. More specifically, the invention relates to a high-efficiency plugging film-forming shield slurry material for emergency rescue.
Background
When the muddy water type shield is tunneled, the shield slurry plays two important roles: firstly, a mud film or a permeable area is formed on an excavation surface by means of mud pressure so as to improve the soil body strength of the excavation surface, and meanwhile, the mud pressure balances the soil pressure and the water pressure of the excavation surface, so that the aim of enabling the excavation surface to be in a stable state in construction is fulfilled; secondly, slurry is used as a conveying medium and is responsible for conveying all dug soil and sand out of a working well; the key for ensuring the safe and smooth shield tunneling construction is to maintain the stability of the excavation surface.
Specifically, the shield mud forms a mud film on the surface or inside of the excavation surface, the hole of the excavation surface is blocked, a stable stress surface is formed, and on the stress surface, the pressure of a mud water bin of the shield machine and the underground water pressure form dynamic balance, so that the aim of stabilizing the excavation surface is fulfilled. According to the above functions, the key indexes for determining the shield slurry quality include: particle composition, viscosity, colloidal fraction and specific gravity; the particle size distribution determines whether the slurry can effectively block various pores of an excavated surface to form an effective mud film, and the particle size distribution is a key index of the slurry; the viscosity determines the slag carrying capacity of the slurry; the colloid rate determines the stability of the slurry; the specific gravity characterizes the solid particle content of the slurry.
The conventional shield slurry mainly comprises a solid phase and water, wherein solid phase substances mainly comprise bentonite, clay, sand grains and other solid particles with different particle sizes and chemical additives, and the bentonite and the chemical additives are main sources of viscosity performance of the slurry. Solid-phase substances in the conventional slurry are rigid particles, and the particle size of the solid-phase substances is fixed, so that the particle size and the grading of the solid-phase substances are matched with the size of stratum pores to form an effective mud film on an excavation surface; when the particle size is too large, the solid-phase substance cannot enter pores in the stratum, so that a good plugging effect is achieved; when the particle size is too small, the solid-phase substances can enter the pores of the stratum, but are quickly washed away under the influence of the water pressure of the stratum and the pressure of the muddy water bin, so that the plugging is failed. Therefore, a model test is usually performed to select a proper solid phase material in the test according to the geological report condition, however, in actual construction, the stratum condition is complex and changeable, the geological report cannot completely and accurately describe the stratum condition, and when the stratum mutation occurs and the mud performance is not matched with the stratum condition, engineering quality safety accidents are very easy to occur.
In view of the above problems, it is necessary to develop a shield slurry material capable of efficiently forming a film under construction conditions in which formation conditions are abrupt, in which solid particles have certain elasticity, that is, particle diameters are variable within a certain range, and even if the particle diameters are larger than formation pores under pressure, the particles can be squeezed into the formation pores due to the elasticity, thereby achieving the effect of plugging.
Disclosure of Invention
The invention aims to provide an efficient plugging film-forming shield slurry material for emergency, which is characterized in that a polymer wrapping material and bentonite are combined in water to form elastic particles, so that slurry prepared from the efficient plugging film-forming shield slurry material for emergency can effectively plug stratum pores, and the stability of an excavation surface is improved.
To achieve these objects and other advantages in accordance with the present invention, there is provided a high efficiency plugging film-forming shield slurry material for emergency use, comprising, in weight percent:
70-80% of bentonite, 10-15% of polymer coating material, 5-10% of colloid enhancer, 1-3% of polymer dispersant and 1-3% of emulsifier.
Preferably, the high-efficiency plugging film-forming shield slurry material for emergency rescue is sodium bentonite.
Preferably, the high-efficiency plugging film-forming shield slurry material for emergency rescue is prepared from one or a mixture of more than two of low-molecular-weight anionic polyacrylamide, low-molecular-weight anionic sodium cellulose, xanthan gum, polyanionic cellulose and oxidized cellulose nanofiber.
Preferably, the high-efficiency plugging film-forming shield slurry material for emergency rescue comprises the following preparation methods of a polymer coating material:
step one, adding a certain amount of biological glue into a 100ml conical flask, adding N, N-dimethylformamide into the conical flask according to the volume ratio of 1:20, placing the conical flask in a constant-temperature water bath environment, and heating and stirring to completely dissolve the biological glue;
step two, adding solid sodium hydroxide into the conical flask, adjusting the pH value of the mixed solution to 8, and then heating and stirring for 30 min;
step three, after fully dissolving the modifier in N, N-dimethylformamide, dripping the dissolved modifier into the conical flask by using a constant-pressure dropping funnel, and reacting for 24 hours at 65 ℃;
step four, adding excessive isopropanol into the reacted solution, precipitating for 1 hour, and drying the precipitate for later use;
step five, fully dissolving the precipitate in distilled water, adding calcium salt with the mass fraction of 1.5% according to the volume ratio of 1:1, fully stirring, adding excessive sodium hydroxide solution with the mass fraction of 0.8%, and stirring for 30min to form modified biogum calcium salt composite precipitate;
squeezing and dehydrating the modified biogum calcium salt composite precipitate, grinding, adding 50% industrial ethanol by volume fraction to completely dissolve, dropwise adding hydrochloric acid to adjust the pH value of the solution to 1.5-2.0, stirring for 30min, filtering and centrifuging to obtain a modified molecular glue precipitate;
and step seven, adding the precipitate of the modified molecular glue into industrial ethanol with the volume fraction of 30% until the precipitate is completely dissolved, dropwise adding ammonia water to adjust the pH value to be neutral, filtering, centrifuging, drying and crushing the solution to obtain precipitate powder, namely the polymer wrapping material.
Preferably, the high-efficiency plugging film-forming shield slurry material for emergency rescue comprises one or a mixture of more than two of gellan gum, pullulan, curdlan and zymosan in the first step.
Preferably, the high-efficiency plugging film-forming shield slurry material for emergency rescue comprises the third step that the modifier is chlorohydrocarbon, and the mass ratio of the modifier to the biological glue is 1: 5.
Preferably, the high-efficiency plugging film-forming shield slurry material for emergency rescue is characterized in that bentonite and the polymer wrapping material are combined in water to form elastic particles, and the average particle size of the elastic particles is 1-4 mm.
The invention at least comprises the following beneficial effects:
1. the polymer wrapping material forms colloid in water, the colloid is combined with bentonite through the charged characteristic of the polymer wrapping material to form elastic particles with bentonite particles as cores and colloid as wrapping layers, the elastic particles can deform in a certain range after being pressurized, and the elastic particles can fully block stratum pores due to the elastic characteristic after being extruded into the stratum pores, so that the bentonite can form a compact mud film on an excavation surface, the polymer wrapping material is suitable for construction environments with large variation of stratum conditions, the shield construction quality is effectively improved, and the construction risk is reduced;
2. the bentonite in the invention adopts sodium bentonite as a core substance of the elastic particles, and the sodium bentonite is combined with a polymer wrapping material due to the positive and negative combination of the electric property, so that the stability of the elastic substance can be enhanced, and the elastic substance can be kept from dissociating in water for a long time;
3. the colloid enhancer can ensure that negatively charged colloid particles (polymer wrapping materials) are orderly and directionally adsorbed on the surfaces of the bentonite particles to form a stable wrapping layer capable of resisting a certain pressure, so that the elastic particles have a certain pressure resistance and cannot be scattered when stratum pores are filled, and the stability of the high-efficiency plugging film-forming shield slurry material for emergency use in water is further ensured;
4. according to the shield slurry prepared by using the high-efficiency plugging film-forming shield slurry material for emergency rescue, the elastic particles formed by combining the bentonite and the polymer wrapping material can not increase the specific gravity of the slurry, and the specific gravity of the solid-phase particles of the slurry is smaller, so that the slurry can keep the dispersed state of the solid-phase substances only by having lower viscosity performance, and the slag carrying performance of the slurry is ensured;
5. when the shield slurry prepared from the high-efficiency plugging film-forming shield slurry material for emergency use is used, the mass ratio of the bentonite to the water is 1:12-1:15, so that the properties of the prepared shield slurry such as viscosity, film-forming speed and the like can be ensured, the proportion of the bentonite required in slurry preparation is reduced under the condition of ensuring the quality of the shield slurry, the construction cost is saved, and the construction progress is accelerated.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is described in further detail below to enable those skilled in the art to practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
The invention provides a high-efficiency plugging film-forming shield slurry material for emergency, which comprises the following components in percentage by weight: 70-80% of bentonite, 10-15% of polymer coating material, 5-10% of colloid enhancer, 1-3% of polymer dispersant and 1-3% of emulsifier.
In the following examples, the bentonite used was sodium bentonite, the colloid enhancer used was a silicone emulsion, the polymeric dispersant used was a styrene maleic anhydride copolymer (i.e., a polybutylene adipate copolymer), and the emulsifier used was a potassium laurate soap (i.e., one of the anionic emulsifier fatty acid soaps).
Wherein, the raw material sources are shown in table 1.
TABLE 1
Example 1:
a polymer wrapping material is prepared by the following steps:
step one, adding a certain amount of biological glue into a 100ml conical flask, adding N, N-dimethylformamide into the conical flask according to the volume ratio of 1:20, placing the conical flask in a constant-temperature water bath environment, and heating and stirring to completely dissolve the biological glue;
step two, adding solid sodium hydroxide into the conical flask, adjusting the pH value of the mixed solution to 8, and then heating and stirring for 30 min;
step three, after fully dissolving the modifier in N, N-dimethylformamide, dripping the dissolved modifier into the conical flask by using a constant-pressure dropping funnel, and reacting for 24 hours at 65 ℃;
step four, adding excessive isopropanol into the reacted solution, precipitating for 1 hour, and drying the precipitate for later use;
step five, fully dissolving the precipitate in distilled water, adding calcium salt with the mass fraction of 1.5% according to the volume ratio of 1:1, fully stirring, adding excessive sodium hydroxide solution with the mass fraction of 0.8%, and stirring for 30min to form modified biogum calcium salt composite precipitate;
squeezing and dehydrating the modified biogum calcium salt composite precipitate, grinding, adding 50% industrial ethanol by volume fraction to completely dissolve, dropwise adding hydrochloric acid to adjust the pH value of the solution to 1.5-2.0, stirring for 30min, filtering and centrifuging to obtain a modified molecular glue precipitate;
and step seven, adding the precipitate of the modified molecular glue into industrial ethanol with the volume fraction of 30% until the precipitate is completely dissolved, dropwise adding ammonia water to adjust the pH value to be neutral, filtering, centrifuging, drying and crushing the solution to obtain precipitate powder, namely the polymer wrapping material.
Wherein the biological glue is zymosan, the modifier is chlorohydrocarbon, and the mass ratio of the biological glue to the consumption of the biological glue is 1: 5.
Example 2:
a shield slurry comprises the following components in percentage by weight: an efficient blocking film-forming shield slurry material for emergency use consists of 10% and 90% of water.
The shield slurry is prepared by the following steps: taking a certain amount of the high-efficiency plugging film-forming shield slurry material for emergency, adding water and the high-efficiency plugging film-forming shield slurry material for emergency into a container in proportion, continuously stirring to fully dissolve the materials, and standing for 2 hours.
The high-efficiency plugging film-forming shield slurry material for emergency comprises the following components in percentage by weight: 72% of sodium bentonite, 15% of a polymer wrapping material, 2% of styrene maleic anhydride copolymer, 10% of silicone resin emulsion and 1% of potassium laurate soap.
The polymer coating material was the polymer coating material prepared in example 1.
Example 3:
a shield slurry comprises the following components in percentage by weight: an efficient blocking film-forming shield slurry material for emergency use consists of 10% and 90% of water.
The preparation method of the shield slurry is the same as that of the example 2.
The high-efficiency plugging film-forming shield slurry material for emergency comprises the following components in percentage by weight: 74% of sodium bentonite, 15% of a polymer wrapping material, 1% of styrene maleic anhydride copolymer, 8% of silicone resin emulsion and 2% of potassium laurate soap.
The polymer coating material was the polymer coating material prepared in example 1.
Example 4:
a shield slurry comprises the following components in percentage by weight: an efficient blocking film-forming shield slurry material for emergency use consists of 10% and 90% of water.
The preparation method of the shield slurry is the same as that of the example 2.
The high-efficiency plugging film-forming shield slurry material for emergency comprises the following components in percentage by weight: 80% of sodium bentonite, 10% of a polymer wrapping material, 2% of a styrene maleic anhydride copolymer, 5% of a silicone resin emulsion and 3% of a potassium laurate soap.
The polymer coating material was the polymer coating material prepared in example 1.
Example 5:
a shield slurry comprises the following components in percentage by weight: an efficient blocking film-forming shield slurry material for emergency use consists of 10% and 90% of water.
The preparation method of the shield slurry is the same as that of the example 2.
The high-efficiency plugging film-forming shield slurry material for emergency comprises the following components in percentage by weight: 74% of sodium bentonite, 15% of a polymer wrapping material, 1% of a polybutylene succinate copolymer, 8% of a styrene maleic anhydride copolymer and 2% of a potassium laurate soap.
The polymer coating material is a mixture of anionic polyacrylamide and polyanionic cellulose (namely polyanionic sodium cellulose) in equal proportion.
Wherein, the raw material sources are shown in table 2.
TABLE 2
| Serial number | Name of raw materials | Raw materials manufacturer | Specification and model |
| 1 | Anionic polyacrylamide | Ciqihui chemical Co Ltd | ZH |
| 2 | Polyanionic cellulose | Hebei Hengji chemical industry Co., Ltd | 9002 |
Comparative example 1:
a shield slurry comprises the following components in percentage by weight: 7.4 percent of bentonite and 92.6 percent of water.
The shield slurry is prepared by the following steps: taking a certain amount of bentonite, adding water and the bentonite into a container according to a certain proportion, continuously stirring to fully dissolve the bentonite, and standing for 2 hours.
Comparative example 2:
a shield slurry comprises the following components in percentage by weight: 10% of bentonite and 90% of water.
The preparation method of the shield slurry is the same as that of comparative example 1.
Comparative example 3:
a shield slurry comprises the following components in percentage by weight: 15% of bentonite and 85% of water.
The preparation method of the shield slurry is the same as that of comparative example 1.
The main performance indexes of the slurry include: the shield slurry in the above examples was tested for its properties by the following experiments, including particle size, viscosity, colloidal fraction, specific gravity, water filtration amount and film formation time.
Experimental example 1: particle size measurement
The particle sizes of the shield muds of examples 2 to 5 and comparative examples 1 to 3 were measured using a LA-960 laser particle size Analyzer (HORIBA), and the average particle size of the samples was expressed as the median particle size (D50), with the results shown in Table 3.
TABLE 3
| Group of | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| D50(mm) | 3.2 | 3.4 | 4.0 | 2.9 | 0.045 | 0.044 | 0.045 |
According to the detection results, the average particle size of the shield slurry prepared by adopting the high-efficiency plugging film-forming shield slurry material for emergency rescue is larger than that of the shield slurry prepared by using bentonite and water, and the reason is that the polymer wrapping material and bentonite particles are respectively provided with negative electricity and positive electricity and are combined under the action of a dispersing agent and a reinforcing agent, so that the size of solid-phase particles in the shield slurry is greatly increased; the solid phase particles formed by combination are elastic particles, and can generate adaptive deformation in a certain range under the action of pressure, so that the formation pores can be fully blocked.
In addition, from the data of examples 2 to 4, as the mass percentage of bentonite increases, the average particle size of the prepared slurry also gradually increases; under the condition that the mass percent of the bentonite is the same, the average particle size of the shield slurry in the embodiment 5 is obviously smaller than that of the shield slurry in the embodiment 3, and it can be seen that the polymer wrapping material in the embodiment 5 is more completely combined with the bentonite particles, that is, the existing polymer wrapping material has better fusion property with the bentonite particles than the polymer wrapping material prepared by using the biological glue.
Experimental example 2: viscosity measurement
The shield slurry viscosities of examples 2-5 and comparative examples 1-3 were measured using ZLN-1A Su funnel viscometer (America) according to the following procedure:
1. and (3) correction: vertically placing the funnel, tightly holding with hands, blocking the tube opening with index finger, and pouring 200ml and 500ml of clear water into the funnel with two ends of the measuring cylinder respectively; then placing 500ml of measuring cylinder with one end facing upwards below the funnel, releasing the index finger to make the clear water in the funnel flow into the measuring cylinder, simultaneously starting a stopwatch to record the time required for completely flowing 500ml of clear water, and when the reading is within 15 +/-0.5 s, the initial state of the funnel is qualified; if the error is within + -1 s, the actual viscosity of the slurry can be calculated using the following equation:
if the error exceeds +/-1 s, recalibrating the instrument;
2. measurement: vertically placing the funnel, tightly holding the funnel by hands, plugging the mouth of the funnel by using a forefinger, and then pouring 200ml shield slurry and 500ml shield slurry into the funnel by using two ends of the measuring cylinder respectively; and then placing 500ml of measuring cylinder with one end facing upwards below the funnel, releasing the index finger to enable the shield slurry in the funnel to flow into the measuring cylinder, starting a stopwatch to record the time required for the 500ml of slurry to flow, namely the viscosity of the measured slurry.
The test results are shown in table 4.
TABLE 4
| Group of | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Viscosity(s) | 24.1 | 23.7 | 26.8 | 27.3 | 19.4 | 21.2 | 23.4 |
From the viscosity test results, it can be seen that whether the slurry prepared by using the high-efficiency plugging film-forming shield slurry material for emergency use has little influence on the viscosity of the shield slurry, but the slurry in example 3 and example 5 has a viscosity significantly higher than that in comparative example 1 or comparative example 2 under the condition that the ratio of bentonite to water is the same (example 3, example 5 and comparative example 1) or the ratio of non-water material (slurry/bentonite prepared by using the high-efficiency plugging film-forming shield slurry material for emergency use) to water is the same (example 3, example 5 and comparative example 2). Therefore, the viscosity of the shield slurry prepared by using the high-efficiency plugging film-forming shield slurry material for emergency is obviously higher than that of the shield slurry prepared by using a conventional method under the condition of the same water content.
The higher the viscosity of the slurry is, the stronger the capability of suspending drilling slag is, and the stronger the capability of protecting walls is, so that the slurry prepared by using the high-efficiency plugging film-forming shield slurry material for emergency can rapidly discharge slag while plugging the formation pores, and effectively improve the system stability in shield construction.
Experimental example 3: colloidal fraction test
And pouring the shield slurry into a 1000ml measuring cylinder to the position of a scale mark of 1000ml, covering glass, standing for 24 hours, and observing the volume of clear liquid at the upper part of the measuring cylinder and the precipitation volume of sand particles at the lower part, wherein the ratio of the volume of clear liquid at the upper part of the measuring cylinder to the precipitation volume of sand particles at the lower part of the measuring cylinder is the colloid rate of the shield slurry sample. The colloidal ratio of the shield slurry in examples 2 to 5 and comparative examples 1 to 3 was measured by the above-described method, and the results are shown in Table 5.
TABLE 5
| Group of | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Colloid ratio (%) | 99 | 100 | 99 | 98 | 100 | 99 | 98 |
Therefore, the colloid rate of the shield slurry prepared by the high-efficiency plugging film-forming shield slurry material for emergency is over 95 percent, and the shield slurry has good dispersion and hydration degrees, compared with the shield slurry in the comparative examples 1-3, although the polymer coating material is added, the polymer coating material is stably combined with bentonite particles under the action of the emulsifier, the polymer dispersant and the colloid reinforcer to form clay particles which can keep a suspension state in water for a long time, so that the prepared shield slurry has high colloid rate, good stability and good rheological property.
Experimental example 4: specific gravity test
And (3) testing the specific gravity of the shield slurry by adopting an XYM-1 liquid densimeter: and adding the sample slurry into a test cup of the liquid densimeter, filling the test cup with the sample slurry, sealing the test cup by using a cup cover, moving a weight on the measurement scale, and reading the reading of the left side edge of the weight on the measurement scale after the measurement scale is in a horizontal position to obtain the specific gravity value of the sample. The specific gravities of the shield grouts in examples 2 to 5 and comparative examples 1 to 3 were measured in sequence according to the above-described methods, and the results are shown in Table 6.
TABLE 6
| Group of | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Specific gravity (g/cm)3) | 1.11 | 1.09 | 1.10 | 1.13 | 1.04 | 1.09 | 1.15 |
Comparative example 1 is to replace the materials such as the polymer coating material, the colloid enhancer, the emulsifier, the polymer dispersant and the like in the formula of example 3 with water in equal proportion, and comparative example 2 is to replace the materials such as the polymer coating material, the colloid enhancer, the emulsifier, the polymer dispersant and the like in the formula of example 3 with bentonite in equal proportion. According to the above test results, the shield slurry of comparative example 2 has the same specific gravity as that of the shield slurry of example 3 under the condition that the water content is the same, i.e., the specific gravity of the prepared slurry is not increased by replacing bentonite in the original components with materials such as a polymer coating material, a colloid fortifier, an emulsifier, a polymer dispersant, etc.
The specific gravity of the slurry represents the content of solid particles in the slurry, and the larger the specific gravity is, the larger the static pressure on a construction surface is, and the more favorable the stability of construction is; however, when the specific gravity of the slurry is too large, the water loss amount of the slurry is increased in the construction work, the slurry film on the excavation surface is thickened, the consumption of the slurry is increased, and the construction efficiency is reduced. Therefore, the specific gravity of the slurry needs to be controlled within a certain interval to balance construction quality and construction efficiency, and under a general condition, the specific gravity of the slurry needs to be controlled between 1.1 and 1.15. According to experimental data, when the high-efficiency plugging film-forming shield slurry material for emergency is used for preparing slurry, the mass ratio of bentonite to water needs to be controlled to be 1:12-1:15, and the specific gravity of the slurry can be guaranteed to reach the standard. In contrast, in the comparative example, the mass ratio of bentonite to water had to reach 1:6 to 1:9 in order to achieve the specific gravity of the prepared slurry. Therefore, the bentonite consumption can be reduced and the construction cost can be saved under the condition of ensuring the stability of the slurry by using the high-efficiency plugging film-forming shield slurry material for emergency use to prepare the slurry.
Experimental example 5: water filtration and film formation time testing
The water filtration amount and the film forming time of the shield slurry are tested by adopting a formation simulation slurry film forming device, and the test device refers to a test device for simulating formation slurry permeation, which is disclosed by the utility model patent No. CN 204758436U.
The specific test method comprises the following steps: before the test, medium coarse sand with the height of 5cm and the grain diameter of 2-5mm is filled at the lower part of a permeation column to be used as a filter layer, then a sand layer with the height of 27cm is filled to be used as a simulated stratum, parameters such as the permeability coefficient, the porosity, the pore size, the grain diameter of the stratum, the dry density of the stratum and the like are simulated, and three types of representative stratums are simulated in the test, wherein the permeability coefficients of the three types of stratums are 0.012cm/s (stratum No. 1), 0.22cm/s (stratum No. 2) and 3.3cm/s (stratum No. 3). In the experimental process, water is injected into the permeation column, then the filtration layer and the corresponding simulated stratum are filled by a forward saturation method, the dry density of the stratum is controlled to be 1.56g/cm3, then slurry with a certain height is injected, the flange plate is sealed, the required air pressure is applied to the permeation column by an air compressor and a pressure stabilizing valve, and then the communicating valve at the bottom end of the permeation column is opened, so that the permeation test can be started.
In the experiment, the slurry pressure is applied in a graded loading mode, the slurry pressure is six levels, the next level is added after the water filtration capacity is stable under each level of pressure, the six levels are respectively 0.05MPa, 0.1MPa, 0.15MPa, 0.2MPa, 0.25MPa and 0.3MPa, the first level of slurry pressure aims at judging whether the slurry can form a film in the stratum, and the following five levels of pressure have the function of judging the quality of the slurry forming the mud film in the stratum.
According to experimental examples 1-4, the viscosity, colloid rate and specific gravity of the shield slurry in comparative example 3 in three groups of comparative examples all meet the basic requirements of slurry performance, and the slurry quality is relatively good. Therefore, the shield mud of the example 2 to the example 5 and the shield mud of the comparative example 3 were tested for the first-stage pressure water filtration amount, the total water filtration amount and the film formation time under the three types of strata by the above experimental method, and the film formation quality was observed, and the results are shown in tables 7 to 9.
TABLE 7
| Stratum No. 1 | First order pressure water filtration quantity (m)3/m2) | Total filtered water volume (m)3/m2) | Film formation time(s) |
| Example 2 | 0.002 | 0.0039 | 11 |
| Example 3 | 0.0023 | 0.0041 | 10 |
| Example 4 | 0.0022 | 0.0037 | 12 |
| Example 5 | 0.0025 | 0.0040 | 15 |
| Comparative example 3 | 0.0021 | 0.0038 | 11 |
TABLE 8
| Stratum No. 2 | First order pressure water filtration quantity (m)3/m2) | Total filtered water volume (m)3/m2) | Film formation time(s) |
| Example 2 | 0.0023 | 0.0041 | 12 |
| Example 3 | 0.0026 | 0.0049 | 10 |
| Example 4 | 0.0027 | 0.0052 | 15 |
| Example 5 | 0.0030 | 0.0043 | 13 |
| Comparative example 3 | 0.0089 | 0.0141 | 21 |
TABLE 9
| Stratum No. 3 | First order pressure water filtration quantity (m)3/m2) | Total filtered water volume (m)3/m2) | Film formation time(s) |
| Example 2 | 0.0031 | 0.0082 | 13 |
| Example 3 | 0.0036 | 0.0089 | 12 |
| Example 4 | 0.0029 | 0.0076 | 12 |
| Example 5 | 0.0037 | 0.0091 | 15 |
| Comparative example 3 | All through | All through | Can not form a film |
From the above experimental data, under the formation No. 1 (permeability coefficient 0.012cm/s), the films of examples 2-5 and comparative example 3 can be formed rapidly within 15s, the water filtration amount under each stage of pressure is small, and the quality of the mud film is excellent; under the formation No. 2 (permeability coefficient is 0.22cm/s), the water filtration amount under each stage of pressure is small, the difference between the water filtration amount data in the formation No. 1 is small, the mud film quality is excellent, while the shield slurry in the comparative example 3 can form the mud film, compared with the data under the formation No. 1 and the test data of the shield slurry in the embodiment No. 2 to the embodiment 5 under the same formation, the water filtration amount is obviously increased, the film forming time is long, and the construction requirement is not met; under the formation No. 3 (permeability coefficient of 3.3cm/s), the water filtration amount of the slurry in the example 2-the example 5 under each stage of pressure is slightly increased, but the rapid film formation can still be realized within 15s, while the slurry in the comparative example 3 completely permeates the formation No. 3 and can not form a mud film.
The average grain diameter of the elastic particles is 1mm-4mm, and the elastic particles are suitable for the stratum construction with the average pore size of 0.6-10 mm; the shield slurry prepared by the conventional method (comparative example 3) can only be suitable for the formation construction of which the formation pores correspond to the slurry particle size. Therefore, the shield slurry prepared by the high-efficiency plugging film-forming shield slurry material for emergency rescue has a wider application range, has a larger average particle size of solid-phase particles and a certain deformation range compared with the shield slurry prepared by a common method (mixing bentonite and water), can adapt to stratum construction under various different pore conditions, has a wider application range, can better adapt to the condition that environmental conditions are suddenly changed in the same stratum, does not need to prepare the slurry again, saves the construction cost and improves the construction efficiency.
In addition, according to the test data in experimental examples 1 to 5, comparing the test data in example 3 with the test data in example 5, it can be seen that, under the condition that the mass fractions of the different components are the same, the polymer coating material prepared by modification and purification of biogel has better binding effect with bentonite particles and higher viscosity of mud, but the difference between the colloid rate, specific gravity and film forming performance of the two groups of mud is small compared with the existing polymer coating material (anionic polyacrylamide and polyanionic cellulose); the steps for preparing the polymer wrapping material by using the biogel are simple, the biogel is easy to obtain, and the cost is lower, so that the construction cost can be further reduced on the basis of ensuring the material performance by selecting the polymer wrapping material prepared by using the biogel as the component of the high-efficiency plugging film-forming shield slurry material for emergency rescue.
In summary, when the shield slurry is prepared by using the high-efficiency plugging film-forming shield slurry material for emergency use, the polymer wrapping material can form elastic negative charge micelles in water, the negative charge micelles are fully dispersed under the action of the polymer dispersant, and as the bentonite particles are positively charged, the single negative charge micelles are orderly and directionally adsorbed on a part of the bentonite particles and combined with the bentonite particles under the action of the colloid reinforcer to form a mixed substance taking the bentonite particles as a core and the ionic micelles as a coating, and the emulsifier can emulsify the colloid reinforcer and the negative charge micelles, so that the polymer wrapping material is further ensured to be fully dispersed in water and combined with the bentonite particles. The particle size range of the formed mixed substance is 1-4 mm, the prepared shield slurry is suitable for stratum construction with the average pore size of 0.6-10mm, and the prepared shield slurry has good elasticity, can effectively block pores in a stratum, forms an effective mud film and maintains the stability of an excavation surface.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (7)
1. An efficient plugging film-forming shield slurry material for emergency rescue is characterized by comprising the following components in percentage by weight:
70-80% of bentonite, 10-15% of polymer coating material, 5-10% of colloid enhancer, 1-3% of polymer dispersant and 1-3% of emulsifier.
2. The high-efficiency plugging film-forming shield slurry material for emergency according to claim 1, wherein the bentonite is sodium bentonite.
3. The high-efficiency plugging film-forming shield slurry material for emergency treatment according to claim 1, wherein the polymer coating material is one or a mixture of more than two of low-molecular-weight anionic polyacrylamide, low-molecular-weight anionic sodium cellulose, xanthan gum, polyanionic cellulose and oxidized cellulose nano-fiber.
4. The high-efficiency plugging film-forming shield slurry material for emergency according to claim 1, wherein the preparation method of the polymer coating material comprises the following steps:
step one, adding a certain amount of biological glue into a 100ml conical flask, adding N, N-dimethylformamide into the conical flask according to the volume ratio of 1:20, placing the conical flask in a constant-temperature water bath environment, and heating and stirring to completely dissolve the biological glue;
step two, adding solid sodium hydroxide into the conical flask, adjusting the pH value of the mixed solution to 8, and then heating and stirring for 30 min;
step three, after fully dissolving the modifier in N, N-dimethylformamide, dripping the dissolved modifier into the conical flask by using a constant-pressure dropping funnel, and reacting for 24 hours at 65 ℃;
step four, adding excessive isopropanol into the reacted solution, precipitating for 1 hour, and drying the precipitate for later use;
step five, fully dissolving the precipitate in distilled water, adding calcium salt with the mass fraction of 1.5% according to the volume ratio of 1:1, fully stirring, adding excessive sodium hydroxide solution with the mass fraction of 0.8%, and stirring for 30min to form modified biogum calcium salt composite precipitate;
squeezing and dehydrating the modified biogum calcium salt composite precipitate, grinding, adding 50% industrial ethanol by volume fraction to completely dissolve, dropwise adding hydrochloric acid to adjust the pH value of the solution to 1.5-2.0, stirring for 30min, filtering and centrifuging to obtain a modified molecular glue precipitate;
and step seven, adding the precipitate of the modified molecular glue into industrial ethanol with the volume fraction of 30% until the precipitate is completely dissolved, dropwise adding ammonia water to adjust the pH value to be neutral, filtering, centrifuging, drying and crushing the solution to obtain precipitate powder, namely the polymer wrapping material.
5. The high-efficiency plugging film-forming shield slurry material for emergency according to claim 4, wherein in the first step, the biogel is one or a mixture of more than two of gellan gum, pullulan, curdlan and zymosan.
6. The high-efficiency plugging film-forming shield slurry material for emergency according to claim 4, wherein in the third step, the modifier is chlorohydrocarbon, and the mass ratio of the modifier to the biological glue is 1: 5.
7. The high efficiency plugging film-forming shield slurry material for emergency according to claim 1, wherein said bentonite and said polymer coating material are combined in water to form elastic particles having an average particle size of 1mm to 4 mm.
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