CN118895112B - Salt-resistant slurry for slurry shield tunneling and method thereof - Google Patents
Salt-resistant slurry for slurry shield tunneling and method thereof Download PDFInfo
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- CN118895112B CN118895112B CN202411381562.5A CN202411381562A CN118895112B CN 118895112 B CN118895112 B CN 118895112B CN 202411381562 A CN202411381562 A CN 202411381562A CN 118895112 B CN118895112 B CN 118895112B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
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- C09K2103/00—Civil engineering use
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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Abstract
本发明公开了一种泥水盾构掘进用抗盐泥浆及其制备方法，属于盾构技术领域，本发明充分利用了废弃泥浆能够有效节约资源、成本，减小环境污染，并且能够调制出满足粘度、析水率、物理化学稳定性等要求的优质泥浆，通过添加抗沉剂改性塔拉胶，降低了高盐泥浆中Ca2+、Mg2+等离子的压迫，增加了黏土颗粒的稳定性，从而防止聚沉或聚集；所述改性塔拉胶具有更大的空间位阻，能够锚定在泥浆中形成三维的胶凝网络结构，使泥浆在接触到高浓度盐水时能够保持其整体结构，防止泥浆发生聚沉和流失，提高了盾构机的施工效率。The invention discloses a salt-resistant mud for slurry shield tunneling and a preparation method thereof, belonging to the technical field of shield tunneling. The invention makes full use of waste mud to effectively save resources and costs, reduce environmental pollution, and can modulate high-quality mud that meets the requirements of viscosity, water separation rate, physical and chemical stability, etc. By adding anti-settling agent modified tara gum, the oppression of Ca2 + , Mg2 + ions and the like in high-salt mud is reduced, the stability of clay particles is increased, and thus coagulation or aggregation is prevented; the modified tara gum has greater steric hindrance and can be anchored in the mud to form a three-dimensional gelling network structure, so that the mud can maintain its overall structure when it contacts with high-concentration salt water, and coagulation and loss of the mud are prevented, thereby improving the construction efficiency of the shield machine.
Description
Technical Field
The invention relates to the technical field of shield, in particular to salt-resistant slurry for slurry shield tunneling and a method thereof.
Background
In recent years, with the continuous advancement of urban infrastructure construction, shield technology plays an important role in the fields of urban traffic and the like. In the process of shield tunneling, the demand for slurry is huge, and the slurry mainly plays multiple roles of lubrication, support, cooling and the like in shield operation.
In the shield construction process, slurry is generally required to stabilize the slurry shield excavation surface, soil residues are carried out of the ground, and meanwhile, the generated waste slurry is large in emission and extremely serious in environmental pollution. At present, the conventional treatment mode of the slurry shield waste slurry is to use a canned slurry truck for outward transportation and to use a slurry site for precipitation and drying, but the two treatment modes have serious limitations. Due to the incorporation of groundwater and fine particles during slurry shield construction, there are inevitably produced waste mud and a large amount of dregs which cannot be reused.
The invention discloses a construction method for modifying and recycling waste slurry, which relates to the technical field of waste slurry and comprises the steps of taking a set amount of waste slurry as a modified sample, measuring an original state index value of the waste slurry, screening the waste slurry by a slurry purification separator for a set time, measuring the sand content of the screened waste slurry until the sand content is lower than the set sand content, stopping screening the waste slurry, adding bentonite solution or clear water into the waste slurry to enable the specific gravity of the waste slurry to be 1.05-1.15, adding strong acid salt or weak base salt into the waste slurry to enable the pH value of the waste slurry to be 7-9, adding cellulose solution into the waste slurry to enable the water loss, the mud skin thickness, the gel content and the viscosity of the waste slurry to meet set requirements, determining the proportion of the bentonite solution, the strong acid, the weak base salt and the cellulose solution as modified formulas, and recycling the waste slurry generated during construction according to the modified formulas, wherein the invention does not disclose the cellulose solution, particularly the cellulose solution, and the modified waste slurry cannot be degraded in terms of the modified salt content, and the quality of the waste slurry cannot be seriously degraded due to the high quality of the waste slurry.
Disclosure of Invention
The main purpose of the invention is to provide a method for preparing slurry for slurry shield tunneling by using waste slurry, and the slurry has good comprehensive performance by optimizing components.
The salt-resistant slurry for slurry shield tunneling comprises, by weight, 1000-1250 parts of waste slurry, 100-300 parts of water, 30-50 parts of bentonite, 1-5 parts of a thickener, 1-3 parts of an anti-settling agent and 1-3 parts of a lubricant.
Preferably, the density of the waste slurry is 1.10g/cm 3-1.45g/cm3, the viscosity of the Suzuki hopper is 20-75s, the bleeding rate is less than or equal to 20% in 24 hours, the waste slurry is generated when the shield passes through the earlier stratum, if the density and the viscosity of the waste slurry are too high, water is added for dilution, if the density of the waste slurry is too low, bentonite is added for adjustment, and if the viscosity of the waste slurry is too low or the bleeding rate is too high, a thickening agent is added for adjustment.
Preferably, the thickening agent is at least one of hydroxypropyl starch, hydroxyethyl cellulose and sodium carbonate, can improve the salt resistance, calcium and magnesium resistance, viscosity increase and fluid loss reduction effects of the slurry, and effectively adjusts the viscosity and physical stability of the slurry so as to adapt to the tunneling requirement of a silt stratum.
Further preferably, the thickener is a mixture of hydroxyethyl cellulose and sodium carbonate, and the mass ratio of the hydroxyethyl cellulose to the sodium carbonate is 1-3:1.
The anti-settling agent is modified tara gum, which is prepared by mixing tara gum with water, heating to dissolve, adding triethylene tetramine and epichlorohydrin, continuing to react for 1-2h, cooling, filtering, freeze-drying the solid to obtain the ammoniated tara gum, dripping chlorosulfonic acid into humic acid, stirring uniformly after dripping, adding into sodium hydroxide aqueous solution to react, adjusting pH to 4-6 with hydrochloric acid aqueous solution, filtering, collecting the solid, washing the solid with water until the filtrate is neutral, drying to obtain sulfonated sodium humate, dispersing the ammoniated tara gum in ethyl acetate, adding sulfonated sodium humate, adjusting pH to 8-10, reacting at 50-75 ℃ for 2-4h, cooling to room temperature, evaporating the solvent under reduced pressure, and drying the residue to obtain the modified tara gum.
Preferably, the dosage ratio of the tara gum to the triethylene tetramine to the epoxy chloropropane to the sulfonated sodium humate is 20-30:10-18:5-8:5-10.
The tara gum adopted by the invention has the advantages of wide sources, low cost, biodegradability and good biocompatibility, the surface contains active hydroxyl groups, the active hydroxyl groups can react with triethylene tetramine under the action of epoxy chloropropane to generate amino modified tara gum, and then the sulfonated sodium humate is grafted on the surface of the tara gum to obtain the modified tara gum. On one hand, the modified tara gum has better dispersibility, can not form clusters, on the other hand, the modified tara gum can ionize in water, can be adsorbed on the surfaces of clay particles to form a hydration layer, changes the potential of the clay particles, reduces the compression of Ca 2+、Mg2+ plasma in high-salt slurry, and increases the stability of the clay particles so as to prevent coagulation or aggregation, and has larger steric hindrance, can be anchored in the slurry to form a three-dimensional gel network structure, so that the slurry can keep the integral structure when contacting high-concentration brine, prevent the slurry from coagulation and loss, and the tara gum grafted with sulfonated sodium humate can also improve the water retention performance of the slurry, prevent segregation, improve the fluidity of the slurry and further be beneficial to improving the construction efficiency of a shield machine.
Preferably, the lubricant is modified molybdenum disulfide, and the preparation method is as follows:
Adding molybdenum disulfide into sodium hydroxide solution, soaking for 5-8h at room temperature, filtering, washing and drying after soaking, adding into ethanol water solution, adding 3-aminopropyl triethoxysilane, reacting for 1-2h at 40-60 ℃, filtering, washing and drying after the reaction is completed to obtain aminated molybdenum disulfide, dispersing the aminated molybdenum disulfide into N, N-dimethylformamide, adding epoxy phenyl silicone oil, adjusting the pH value to 4-6, then reacting for 3-5h at 60-100 ℃, filtering, washing and drying after the reaction is completed to obtain the modified molybdenum disulfide.
Preferably, the dosage ratio of the molybdenum disulfide, the 3-aminopropyl triethoxysilane and the epoxy phenyl silicone oil is 30-50:1-3:5-8.
The molybdenum disulfide is a good lubricant, and after the molybdenum disulfide is added into the slurry, the resistance among substances in the system can be reduced, so that the fluidity of the slurry is improved, the dispersibility of the molybdenum disulfide in the system can be improved by modifying the molybdenum disulfide, the uniformly dispersed modified molybdenum disulfide has good compression resistance and wear resistance, and the epoxy phenyl silicone oil can form a stable lubricating film layer in the slurry, so that the lubricating stability of the slurry is further improved.
The invention also discloses a preparation method of the salt-resistant slurry for slurry shield tunneling, which comprises the following steps:
And (3) placing waste mud and water generated when the shield passes through the earlier stratum into a slurry mixing tank, adding bentonite, a thickening agent, an anti-settling agent and a lubricant, and fully stirring to obtain the salt-resistant mud for slurry shield tunneling.
Preferably, the stirring condition is that the rotating speed is 700-900rpm, and the stirring time is 20-40min.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention fully utilizes the waste slurry, can effectively save resources and cost, reduce environmental pollution, and can prepare high-quality slurry meeting the requirements of density, viscosity, segregation rate, physical and chemical stability and the like, the slurry can form a compact slurry film on the excavation surface of a silt stratum, and the excavation surface is effectively maintained stable, so that the method is an efficient, environment-friendly and energy-saving slurry shield tunneling slurry preparation method;
2. According to the invention, the anti-settling agent is added to modify the tara gum, the modified tara gum can be ionized in water and can be adsorbed on the surfaces of clay particles to form a hydration layer, so that the potential of the clay particles is changed, the compression of Ca 2+、Mg2+ plasma in high-salt water is reduced, the stability of the clay particles is increased, and thus, the settlement or aggregation is prevented;
3. According to the invention, the dispersibility of the molybdenum disulfide in the system can be improved by adding the lubricant modified molybdenum disulfide, the uniformly dispersed modified molybdenum disulfide has good compression resistance and wear resistance, and the epoxy phenyl silicone oil can form a stable lubricating film layer in slurry, so that the lubricating stability of the slurry is further improved.
Detailed Description
For the sake of brevity, the articles used in the examples below are commercially available products unless otherwise specified, and the methods used are conventional methods unless otherwise specified. The following description of the embodiments of the present invention will be presented in further detail with reference to the examples, which should be understood as being merely illustrative of the present invention and not limiting.
The sources of part of raw materials used in the invention are as follows:
Bentonite with an active ingredient content of 94%, a whiteness of 80%, a particle size of 50 μm, an expansion factor of 10-25, and a density of 2g/cm 3, which is purchased from a tourmaline mineral product processing factory in Lingshou county.
Tara gum, 99% in weight, was purchased from Jiangsu Miao biosciences, inc.
Molybdenum disulfide, 99% pure and 200nm particle size, was purchased from sienna ziyue biotechnology limited.
Epoxy phenyl silicone oil with viscosity of 30-50cst is purchased from Anhui Xinjia organosilicon technology Co.
Example 1
The preparation method of the salt-resistant slurry for slurry shield tunneling comprises the following steps:
1140g of waste slurry generated when a shield passes through a pre-stratum and 200g of water are placed in a slurry mixing tank, 40g of bentonite, 4g of thickener, 2g of modified tara gum and 2g of modified molybdenum disulfide are added, and stirring is carried out for 30min at the rotating speed of 800rpm to obtain salt-resistant slurry for slurry shield tunneling, wherein the density of the waste slurry is 1.31g/cm 3, the viscosity of a threo funnel is 53s, the bleeding rate of the threo funnel is 18%, and the thickener is a mixture of 2.5g of hydroxyethyl cellulose and 1.5g of sodium carbonate;
The preparation method of the modified tara gum comprises the steps of mixing 26g of tara gum with 400mL of water, heating at 80 ℃ for 15min to obtain a tara gum solution, adding 14g of triethylene tetramine and 6.6g of epichlorohydrin, continuously reacting for 1.5h, cooling, filtering, freeze-drying the solid at-40 ℃ for 24h to obtain the ammoniated tara gum, dropwise adding 10mL of chlorosulfonic acid into 10g of humic acid, uniformly stirring after dropwise adding, then adding into 200mL of 1mol/L of sodium hydroxide aqueous solution, reacting for 15min, adjusting the pH to 5 with 1mol/L of hydrochloric acid aqueous solution, filtering, collecting the solid, washing the solid until the filtrate is neutral, drying to obtain sodium sulfonate, dispersing the ammoniated tara gum into 800mL of ethyl acetate, adding 8.6g of sodium sulfonate, adjusting the pH to 9, reacting at 65 ℃ for 3h, cooling to room temperature, evaporating the solvent under reduced pressure, and drying the frozen residue at-40 ℃ for 24h to obtain the modified tara gum.
The preparation method of the modified molybdenum disulfide comprises the following steps:
Adding 43.4g of molybdenum disulfide into 500mL of 1mol/L sodium hydroxide solution, soaking for 7h at room temperature, filtering after soaking, collecting solids, washing until filtrate is neutral, drying, adding the solids into 600mL of 50wt% ethanol water solution, adding 2g of 3-aminopropyl triethoxysilane, reacting for 1.5h at 50 ℃, filtering after the reaction is finished, collecting the solids, washing the solids with water for 3 times, drying for 6h at 80 ℃ to obtain the aminated molybdenum disulfide, dispersing the aminated molybdenum disulfide into 800mL of N, N-dimethylformamide, adding 6.8g of epoxy phenyl silicone oil, adjusting the pH value to 5, reacting for 4h at 80 ℃, filtering after the reaction is finished, collecting a filter cake, washing the filter cake with ethanol for 3 times, and drying for 8h at 60 ℃ to obtain the modified molybdenum disulfide.
Example 2
The preparation method of the salt-resistant slurry for slurry shield tunneling comprises the following steps:
1000g of waste slurry generated when a shield passes through a pre-stratum and 100g of water are placed in a slurry mixing tank, 30g of bentonite, 4g of thickener, 1g of modified tara gum and 3g of modified molybdenum disulfide are added, and stirring is carried out for 40min at the rotating speed of 700rpm to obtain salt-resistant slurry for slurry shield tunneling, wherein the density of the waste slurry is 1.10g/cm 3, the viscosity of a threo funnel is 20s, the bleeding rate of 24h is 15%, and the thickener is a mixture of 2g of hydroxyethyl cellulose and 2g of sodium carbonate;
The preparation method of the modified tara gum comprises the steps of mixing 20g of tara gum with 400mL of water, heating at 80 ℃ for 15min to obtain tara gum solution, adding 10.2g of triethylene tetramine and 5g of epichlorohydrin, continuously reacting for 1h, cooling, filtering, freeze-drying solids at-40 ℃ for 24h to obtain ammoniated tara gum, dropwise adding 10mL of chlorosulfonic acid into 10g of humic acid, uniformly stirring after dropwise adding, adding into 200mL of 1mol/L of sodium hydroxide aqueous solution, reacting for 15min, adjusting pH to 5 by using 1mol/L of hydrochloric acid aqueous solution, filtering, collecting solids, washing the solids until filtrate is neutral, drying to obtain sulfonated sodium humate, dispersing the ammoniated tara gum into 800mL of ethyl acetate, adding 5g of sulfonated sodium humate, adjusting pH to 10, reacting at 55 ℃ for 2h, cooling to room temperature, decompressing, evaporating solvent, freeze-drying residues at-40 ℃ for 24h to obtain the modified tara gum.
The preparation method of the modified molybdenum disulfide comprises the following steps:
Adding 30.3g of molybdenum disulfide into 500mL of 1mol/L sodium hydroxide solution, soaking for 5h at room temperature, filtering after soaking, collecting solids, washing until filtrate is neutral, drying, adding the solids into 600mL of 50wt% ethanol water solution, adding 1g of 3-aminopropyl triethoxysilane, reacting for 1h at 50 ℃, filtering after the reaction is finished, collecting the solids, washing the solids with water for 3 times, drying for 6h at 80 ℃ to obtain aminated molybdenum disulfide, dispersing the aminated molybdenum disulfide into 800mL of N, N-dimethylformamide, adding 5.1g of epoxy phenyl silicone oil, adjusting the pH value to 4, reacting for 3h at 60 ℃, filtering after the reaction is finished, collecting filter cakes, washing the filter cakes with ethanol for 3 times, and drying for 8h at 60 ℃ to obtain modified molybdenum disulfide.
Example 3
The preparation method of the salt-resistant slurry for slurry shield tunneling comprises the following steps:
Setting 1250g of waste slurry generated when a shield passes through a pre-stratum and 300g of water in a slurry mixing tank, adding 50g of bentonite, 5g of thickener, 3g of modified tara gum and 1g of modified molybdenum disulfide, and stirring for 20min at the rotating speed of 900rpm to obtain salt-resistant slurry for slurry shield tunneling, wherein the density of the waste slurry is 1.45g/cm 3, the viscosity of a threo funnel is 75s and the bleeding rate of 24h is 13%, and the thickener is a mixture of 3g of hydroxyethyl cellulose and 2g of sodium carbonate;
The preparation method of the modified tara gum comprises the steps of mixing 30g of tara gum with 400mL of water, heating at 80 ℃ for 15min to obtain a tara gum solution, adding 18g of triethylene tetramine and 8g of epichlorohydrin, continuously reacting for 2h, cooling, filtering, freeze-drying solids at-40 ℃ for 24h to obtain an ammoniated tara gum, dropwise adding 10mL of chlorosulfonic acid into 10g of humic acid, uniformly stirring after dropwise adding, adding into 200mL of 1mol/L of sodium hydroxide aqueous solution, reacting for 15min, adjusting pH to 5 by using 1mol/L of hydrochloric acid aqueous solution, filtering, collecting solids, washing the solids until filtrate is neutral, drying to obtain sodium sulfonate, dispersing the ammoniated tara gum into 800mL of ethyl acetate, adding 10g of sodium sulfonate, adjusting pH to 8, reacting at 75 ℃ for 4h, cooling to room temperature, evaporating the solvent under reduced pressure, freeze-drying the residues at-40 ℃ for 24h to obtain the modified tara gum.
The preparation method of the modified molybdenum disulfide comprises the following steps:
50g of molybdenum disulfide is added into 500mL of 1mol/L sodium hydroxide solution, dipping is carried out for 8 hours at room temperature, filtering is carried out after the dipping is finished, solid matters are collected and washed until filtrate is neutral, drying is carried out, then the solid matters are added into 600mL of 50wt% ethanol water solution, 3g of 3-aminopropyl triethoxysilane is added for reaction for 2 hours at 60 ℃, solid matters are collected after the reaction is finished, the solid matters are filtered and dried for 6 hours at 80 ℃ after being washed for 3 times by water, the molybdenum disulfide is dispersed into 800mL of N, N-dimethylformamide, 7.9g of epoxy phenyl silicone oil is added, the pH value is regulated to 5, then the reaction is carried out for 3 hours at 100 ℃, filter cakes are filtered and collected after the reaction is finished, and the filter cakes are dried for 8 hours at 60 ℃ after the filter cakes are washed for 3 times by ethanol, so as to obtain modified molybdenum disulfide.
Comparative example 1
The preparation method of the salt-resistant slurry for slurry shield tunneling is similar to the embodiment 1, and is characterized in that the used anti-settling agent is tara gum, and specifically comprises the following steps:
1140g of waste slurry generated when a shield passes through a pre-stratum and 200g of water are placed in a slurry mixing tank, 40g of bentonite, 4g of thickener, 2g of tara gum and 2g of modified molybdenum disulfide are added, and stirring is carried out for 30min at the rotating speed of 800rpm to obtain salt-resistant slurry for slurry shield tunneling, wherein the density of the waste slurry is 1.31g/cm 3, the viscosity of a threo funnel is 53s, the bleeding rate of 24h is 18%, and the thickener is a mixture of 2.5g of hydroxyethyl cellulose and 1.5g of sodium carbonate;
the preparation method of the modified molybdenum disulfide comprises the following steps:
Adding 43.4g of molybdenum disulfide into 500mL of 1mol/L sodium hydroxide solution, soaking for 7h at room temperature, filtering after soaking, collecting solids, washing until filtrate is neutral, drying, adding the solids into 600mL of 50wt% ethanol water solution, adding 2g of 3-aminopropyl triethoxysilane, reacting for 1.5h at 50 ℃, filtering after the reaction is finished, collecting the solids, washing the solids with water for 3 times, drying for 6h at 80 ℃ to obtain the aminated molybdenum disulfide, dispersing the aminated molybdenum disulfide into 800mL of N, N-dimethylformamide, adding 6.8g of epoxy phenyl silicone oil, adjusting the pH value to 5, reacting for 4h at 80 ℃, filtering after the reaction is finished, collecting a filter cake, washing the filter cake with ethanol for 3 times, and drying for 8h at 60 ℃ to obtain the modified molybdenum disulfide.
Comparative example 2
The preparation method of the salt-resistant slurry for slurry shield tunneling is similar to the embodiment 1, and is characterized in that the lubricant is molybdenum disulfide, and specifically comprises the following steps:
1140g of waste slurry generated when a shield passes through a pre-stratum and 200g of water are placed in a slurry mixing tank, 40g of bentonite, 4g of thickener, 2g of modified tara gum and 2g of molybdenum disulfide are added, and stirring is carried out for 30min at the rotating speed of 800rpm to obtain salt-resistant slurry for slurry shield tunneling, wherein the density of the waste slurry is 1.31g/cm 3, the viscosity of a threo funnel is 53s, the bleeding rate of 24h is 18%, and the thickener is a mixture of 2.5g of hydroxyethyl cellulose and 1.5g of sodium carbonate.
The preparation method of the modified tara gum comprises the steps of mixing 26g of tara gum with 400mL of water, heating at 80 ℃ for 15min to obtain a tara gum solution, adding 14g of triethylene tetramine and 6.6g of epichlorohydrin, continuously reacting for 1.5h, cooling, filtering, freeze-drying the solid at-40 ℃ for 24h to obtain the ammoniated tara gum, dropwise adding 10mL of chlorosulfonic acid into 10g of humic acid, uniformly stirring after dropwise adding, then adding into 200mL of 1mol/L of sodium hydroxide aqueous solution, reacting for 15min, adjusting the pH to 5 with 1mol/L of hydrochloric acid aqueous solution, filtering, collecting the solid, washing the solid until the filtrate is neutral, drying to obtain sodium sulfonate, dispersing the ammoniated tara gum into 800mL of ethyl acetate, adding 8.6g of sodium sulfonate, adjusting the pH to 9, reacting at 65 ℃ for 3h, cooling to room temperature, evaporating the solvent under reduced pressure, and drying the frozen residue at-40 ℃ for 24h to obtain the modified tara gum.
Test case
Test subjects salt-resistant slurry for slurry shield tunneling prepared in examples 1 to 3 and comparative examples 1 to 2;
viscosity test, namely measuring the viscosity of slurry by adopting a Su funnel viscometer and a stopwatch, wherein the unit is s;
The water separation rate is measured by a measuring cylinder and a glass plate, namely the water separation rate of the slurry, namely the ratio of the water separated from the slurry to the original slurry volume within 24 hours when the sample slurry is prepared, and the smaller the value is, the better the stability of the slurry is;
Fluid loss performance, namely measuring the water loss of slurry by adopting an inflator fluid loss meter;
static force-using mud static force test, the test results are shown in table 1:
TABLE 1 results of Performance test of salt-resistant mud for slurry shield tunneling
As can be seen from the experimental results in Table 1, the salt-resistant slurry for slurry shield tunneling prepared in examples 1 to 3 of the present invention has higher comprehensive properties.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, but various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The salt-resistant slurry for slurry shield tunneling is characterized by comprising, by weight, 1000-1250 parts of waste slurry, 100-300 parts of water, 30-50 parts of bentonite, 1-5 parts of a thickener, 1-3 parts of an anti-settling agent and 1-3 parts of a lubricant;
The anti-settling agent is modified tara gum, which is prepared by mixing tara gum with water, heating and dissolving, adding triethylene tetramine and epoxy chloropropane, continuing to react for 1-2 hours, cooling, filtering, freeze-drying a solid substance to obtain the ammoniated tara gum, dripping chlorosulfonic acid into humic acid, uniformly stirring after dripping, adding into sodium hydroxide aqueous solution for reaction, adjusting pH to 4-6 with hydrochloric acid aqueous solution, filtering, collecting the solid substance, washing the solid substance with water until the filtrate is neutral, and drying to obtain sulfonated sodium humate;
The dosage ratio of the tara gum to the triethylene tetramine to the epoxy chloropropane to the sulfonated sodium humate is 20-30:10-18:5-8:5-10;
Adding molybdenum disulfide into a sodium hydroxide solution, soaking for 5-8 hours at room temperature, filtering, washing and drying after soaking, then adding into an ethanol water solution, adding 3-aminopropyl triethoxysilane, reacting for 1-2 hours at 40-60 ℃, filtering, washing and drying after the reaction is completed, and obtaining aminated molybdenum disulfide; dispersing aminated molybdenum disulfide in N, N-dimethylformamide, adding epoxy phenyl silicone oil, adjusting the pH value to 4-6, then reacting for 3-5 hours at 60-100 ℃, filtering, washing and drying after the reaction is finished to obtain modified molybdenum disulfide;
The dosage ratio of the molybdenum disulfide to the 3-aminopropyl triethoxysilane to the epoxy phenyl silicone oil is 30-50:1-3:5-8.
2. The salt-resistant mud as set forth in claim 1, including the step of the waste mud having a density of 1.10g/cm 3-1.45g/cm3, a soviet funnel viscosity of 20-75s, and a 24h bleeding rate of 20% or less.
3. The salt resistant slurry of claim 1 wherein said thickener is a mixture of hydroxyethylcellulose and sodium carbonate.
4. The salt-resistant slurry according to claim 3, wherein the mass ratio of the hydroxyethyl cellulose to the sodium carbonate is 1-3:1.
5. A method for preparing salt-resistant slurry according to any one of claims 1 to 4, which is characterized by comprising the following steps of placing waste slurry and water generated when a shield passes through a pre-stratum into a slurry mixing tank, adding bentonite, a thickening agent, an anti-settling agent and a lubricating agent, and fully stirring to obtain the salt-resistant slurry for slurry shield tunneling.
6. The method of claim 5, wherein the stirring is performed at a speed of 700-900rpm for 20-40min.
Priority Applications (1)
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