A submarine shield mud viscosity reducer, use method and application

Abstract

The present invention belongs to the technical field of mud-water shield slurry circulation, and discloses a submarine shield slurry viscosity reducer, a method of use and an application. The shield slurry viscosity reducer is composed of the following components in parts by weight: 0.006-0.02 of aluminum sulfate, 0.005-0.015 of lignin sulfonate, 0.0008-0.003 of sodium polyphosphate, 0.005-0.02 of industrial defoamer, and 0.0008-0.002 of pH regulator, and the ingredients are prepared according to the mud mass of 1 when used. The present invention is compounded according to a certain ratio by aluminum sulfate, lignin sulfonate, industrial defoamer, pH regulator, and sodium tripolyphosphate, and is added to the submarine shield slurry with a viscosity of 30s-45s measured by a Su-type funnel viscometer and uniformly mixed. After treatment, the viscosity decreases by 50%-60% and does not stick to the pipe wall, which can effectively solve the engineering problems such as mud cake on the cutter head and blockage of the mud delivery pipeline in shield construction, and improve the construction efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of slurry circulation of slurry shields, and in particular relates to a submarine shield slurry viscosity reducer, a use method and an application thereof. Background Art

[0002] With the large-scale construction of urban subways, large-scale river-crossing tunnels, and water diversion projects in my country, the application of slurry shield tunneling technology is becoming increasingly widespread. Numerous urban subway tunnel projects currently under construction both domestically and internationally are preparing to or are currently employing slurry shield construction. Slurry shield construction, with its advantages of efficiency, safety, and cost-effectiveness, has captured a significant market share. Under complex geological conditions, the cutterhead rotation rate and slurry system circulation efficiency of a slurry shield directly constrain the efficiency of shield construction. In particular, the unobstructed flow of the slurry circulation system piping directly determines the feasibility of using a slurry shield.

[0003] Shield engineering mud is primarily a suspension system composed of water, bentonite particles, clay particles, and admixtures. During shield tunneling, the mud not only stabilizes the front face but also directly affects the cutterhead torque and total thrust during tunneling. The incorporation of face debris changes the viscosity of the shield engineering mud. As the viscosity increases, excessively high mud viscosity can easily lead to the formation of mud cakes on the face of the cutterhead, making it difficult for face debris to enter the mud and water silo. Excessive mud viscosity can also easily cause congestion at bends in the mud circulation pipeline, resulting in a sharp increase in cutterhead torque and mud pump pressure. In severe cases, this can cause work stoppages and impact construction efficiency.

[0004] Through the above analysis, the problems and defects of the existing technology are as follows:

[0005] (1) The current means of solving the above problems in construction is mainly to discard the slurry and add clean water for dilution to reduce the viscosity and ensure the construction progress. This treatment method not only produces a large amount of waste slurry but also requires the re-preparation of sufficient slurry for circulation, which has a high construction cost.

[0006] (2) During long-distance construction, there is wear and tear on the mud separation equipment. Once it is severely worn, it needs to be replaced in time. Otherwise, it is easy to cause unsatisfactory mud recovery effect and high equipment cost.

[0007] (3) Currently, the cutterhead of submarine slurry shield is prone to mud cake formation and mud circulation pipeline blockage. Summary of the Invention

[0008] To overcome the problems existing in the related art, the embodiments disclosed in the present invention provide a submarine shield mud viscosity reducer, a method of use and an application thereof.

[0009] The technical solution is as follows: A shield mud viscosity reducer is composed of the following components in parts by weight: 0.006-0.02 of aluminum sulfate, 0.005-0.015 of lignin sulfonate, 0.0008-0.003 of sodium polyphosphate, 0.005-0.015 of industrial defoaming agent, and 0.0008-0.002 of pH regulator. When used, the ingredients are prepared according to the mud mass being 1.

[0010] In one embodiment, the aluminum sulfate is Al2(SO4)3·18H2O crystals or crystalline powder, wherein the Al2(SO4)3·18H2O content is ≥50%, the alkali metal and alkaline earth metal (calculated as sulfate) content is ≤0.25%, the chloride content is ≤0.002%, the ammonium salt content is ≤0.005%, the iron content is ≤0.003%, the heavy metal content is ≤0.001%, the water-insoluble matter content is ≤0.02%, and the pH value (50 g / L, 25°C) is ≥2.5.

[0011] In one embodiment, the lignin sulfonate includes but is not limited to sodium lignin sulfonate, calcium lignin sulfonate, and magnesium lignin sulfonate.

[0012] In one embodiment, the lignin sulfonate contains C 20 H 24 Na2O 10 S2 or C 20 H 24 CaO 10 S2 or C 20 H 24 MgO 10 The S2 content is between 45% and 60%, the moisture content is ≤5%, the iron content is ≤0.1%, the sulfate content is ≤4%, the water-insoluble matter content is ≤2%, and the pH value (20°C aqueous solution) is between 7 and 9.

[0013] In one embodiment, the sodium polyphosphate is Na5P3O 10 White powder, including Na5P3O 10 The content is between 56% and 60%, lead content ≤0.01%, chloride content ≤0.01%, sulfate content ≤0.1%, iron content ≤0.03%, and water-insoluble matter content ≤0.03%.

[0014] In one embodiment, the industrial defoamer is a liquid industrial-grade organosilicon defoamer.

[0015] In one embodiment, the pH regulator is industrial-grade anhydrous sodium carbonate powder, wherein the anhydrous sodium carbonate content is ≥98%, the water-insoluble matter content is ≤0.01%, the chloride content is ≤0.002%, the loss on ignition (300°C) is ≤1%, and the sulfur compound content is ≤0.005%.

[0016] Another object of the present invention is to provide a method for using the shield mud viscosity reducer, comprising: taking 50 ml of clean water, adding Al2(SO4)3·18H2O, Na5P3O 10 , lignin sulfonate, industrial defoamer, and industrial-grade sodium carbonate are stirred evenly to obtain a mixed solution, which is added to the shield mud with a viscosity of 30s to 45s in the Solomon funnel and stirred for 3-5 minutes to complete the treatment.

[0017] Another object of the present invention is to provide an application of the shield mud viscosity reducer in the construction of slurry shield tunnels in urban subways, large-scale river-crossing tunnel projects and water diversion projects.

[0018] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0019] At present, there is no viscosity reducer in the field of shield mud viscosity reduction. The present invention innovatively mixes aluminum sulfate, lignin sulfonate, industrial defoamer, pH regulator, and sodium tripolyphosphate in a certain ratio, and adds them to the submarine shield mud with a viscosity of 30s-45s measured by a Sogro-type funnel viscometer and evenly mixes them. After treatment, the viscosity is reduced by 50% to 60% and the mud does not stick to the pipe wall. It can effectively solve engineering problems such as mud cake on the cutter head and blockage of mud conveying pipelines in shield construction, thereby improving construction efficiency.

[0020] The present invention designs a single-factor test scheme, selects four components with the best effects to design a four-factor three-level orthogonal test scheme, and comprehensively compares the cost and viscosity reduction effect to obtain the optimal mix ratio of the present invention.

[0021] The current main treatment of slurry viscosity in slurry shields is to add a thickener to increase the viscosity of the slurry during preparation to enhance its slag carrying capacity. However, the engineering problem faced by the present invention is that when the slurry shield machine is excavating in poor seabed strata, the viscosity of the slurry in the slurry tank increases due to geological conditions, which can easily cause blockage of the circulation system pipeline and affect the construction progress. At present, there is no relevant viscosity reducer in the field of slurry shield mud treatment. The experimental subject for determining the components and proportions of the present invention is the slurry shield circulating mud of the sea area section of Qingdao Metro Line 8. The use of components and proportions in other existing slurry viscosity reduction fields cannot solve the viscosity problem of slurry shield mud under current geological conditions. Therefore, a single factor test plus an orthogonal test (the experimental steps can be carried out according to the steps disclosed in the relevant materials) is used to determine the viscosity reducer suitable for slurry shield mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Figure 1 The present invention provides a flowchart of a method for using a shield mud viscosity reducer according to an embodiment of the present invention.

[0024] Figure 2 It is a line graph showing the effect of using the shield mud viscosity reducer provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] The experimental methods in the present invention are all conventional methods unless otherwise specified.

[0027] Unless otherwise specified, the experimental materials used in the present invention are all commercially available.

[0028] The invention provides a shield mud viscosity reducer, which is composed of the following components in parts by weight: 0.006-0.02 of aluminum sulfate, 0.005-0.015 of lignin sulfonate, 0.0008-0.003 of sodium polyphosphate, 0.005-0.02 of industrial defoaming agent, and 0.0008-0.002 of pH regulator. When used, the ingredients are prepared based on the mud mass being 1.

[0029] In a preferred embodiment, the aluminum sulfate is Al2(SO4)3·18H2O crystals or crystalline powder, wherein the Al2(SO4)3·18H2O content is ≥50%, the alkali metal and alkaline earth metal (calculated as sulfate) content is ≤0.25%, the chloride content is ≤0.002%, the ammonium salt content is ≤0.005%, the iron content is ≤0.003%, the heavy metal content is ≤0.001%, the water-insoluble matter content is ≤0.02%, and the pH value (50 g / L, 25°C) is ≥2.5.

[0030] In a preferred embodiment, the lignin sulfonate includes but is not limited to sodium lignin sulfonate, calcium lignin sulfonate, and magnesium lignin sulfonate.

[0031] In a preferred embodiment, the lignin sulfonate contains C 20 H 24 Na2O 10 S2 or C 20 H 24 CaO 10 S2 or C 20 H 24 MgO 10The S2 content is between 45% and 60%, the moisture content is ≤5%, the iron content is ≤0.1%, the sulfate content is ≤4%, the water-insoluble matter content is ≤2%, and the pH value (20°C aqueous solution) is between 7 and 9.

[0032] In a preferred embodiment, the sodium polyphosphate is Na5P3O 10 White powder, including Na5P3O 10 The content is between 56% and 60%, lead content ≤0.01%, chloride content ≤0.01%, sulfate content ≤0.1%, iron content ≤0.03%, and water-insoluble matter content ≤0.03%.

[0033] In a preferred embodiment, the industrial defoamer is a liquid industrial-grade organosilicon defoamer.

[0034] In a preferred embodiment, the pH regulator is industrial grade anhydrous sodium carbonate powder, wherein the anhydrous sodium carbonate content is ≥98%, the water-insoluble matter content is ≤0.01%, the chloride content is ≤0.002%, the loss on ignition (300°C) is ≤1%, and the sulfur compound content is ≤0.005%.

[0035] Figure 1 The present invention provides a method for using a shield mud viscosity reducer, comprising:

[0036] S101, take 50ml of clean water, add Al2(SO4)3·18H2O, Na5P3O 10 , lignin sulfonate, industrial defoamer, and industrial grade sodium carbonate are stirred uniformly to obtain a mixed solution;

[0037] S102, adding the mixed solution to the shield mud with a viscosity of 30s to 45s in the Solomon funnel and stirring for 3-5 minutes, and the treatment is completed.

[0038] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0039] Implementation Example 1:

[0040] Embodiment 1 of the present invention provides a shield mud viscosity reducer, which includes the following components in parts by weight: 1 part for 300 ml of shield mud (viscosity measured by a Sogro funnel viscometer), 0.008 parts of aluminum sulfate, 0.0056 parts of lignin sulfonate, 0.0016 parts of sodium polyphosphate, 0.01 parts of industrial defoaming agent, and 0.0008 parts of industrial-grade sodium carbonate.

[0041] Take 50ml of clean water and add Al2(SO4)3·18H2O, Na5P3O 10, lignin sulfonate, industrial defoamer, and industrial-grade sodium carbonate are stirred evenly to obtain a mixed solution, which is added to the shield mud with a viscosity of 30s to 45s in the Solomon funnel and stirred for 3-5 minutes to complete the treatment.

[0042] Implementation Example 2:

[0043] Embodiment 2 of the present invention provides a shield mud viscosity reducer, which includes the following components in parts by weight: 1 part for 300 ml of shield mud (viscosity measured by a Sogro funnel viscometer), 0.008 parts of aluminum sulfate, 0.0064 parts of lignin sulfonate, 0.0008 parts of sodium polyphosphate, 0.02 parts of industrial defoaming agent, and 0.0008 parts of industrial-grade sodium carbonate.

[0044] The method of using the shield mud viscosity reducer is the same as the method of using the shield mud viscosity reducer in Example 1.

[0045] Implementation Example 3:

[0046] Embodiment 3 of the present invention provides a shield mud viscosity reducer, which includes the following components in parts by weight: 1 part for 300 ml of shield mud (viscosity measured by a Sogro funnel viscometer), 0.0096 parts of aluminum sulfate, 0.0064 parts of lignin sulfonate, 0.0016 parts of sodium polyphosphate, 0.005 parts of industrial defoaming agent, and 0.0008 parts of industrial-grade sodium carbonate.

[0047] The method of using the shield mud viscosity reducer is the same as the method of using the shield mud viscosity reducer in Example 1.

[0048] Implementation Example 4:

[0049] Embodiment 4 of the present invention provides a shield mud viscosity reducer, which includes the following components in parts by weight: 1 part for 300 ml of shield mud (viscosity measured by a Sogro funnel viscometer), 0.0096 parts of aluminum sulfate, 0.0072 parts of lignin sulfonate, 0.0008 parts of sodium polyphosphate, 0.01 parts of industrial defoaming agent, and 0.0016 parts of industrial-grade sodium carbonate.

[0050] The method of using the shield mud viscosity reducer is the same as the method of using the shield mud viscosity reducer in Example 1.

[0051] Implementation Example 5:

[0052] Embodiment 5 of the present invention provides a shield mud viscosity reducer, which includes the following components in parts by weight: 1 part for 300 ml of shield mud (viscosity measured by a Sogro funnel viscometer), 0.008 parts of aluminum sulfate, 0.0072 parts of lignin sulfonate, 0.0016 parts of sodium polyphosphate, 0.02 parts of industrial defoaming agent, and 0.0016 parts of industrial-grade sodium carbonate.

[0053] The method of using the shield mud viscosity reducer is the same as the method of using the shield mud viscosity reducer in Example 1.

[0054] The best effect data obtained through orthogonal test are shown in Table 1.

[0055] Table 1 Record of shield mud viscosity changes in implementation examples 1 to 5

[0056] Group Viscosity before treatment (s) Viscosity after treatment (s) Optimization rate Implementation Example 1 34 15.3 55％ Implementation Example 2 35 14 60％ Implementation Example 3 35 15.3 56.29％ Implementation Example 4 34 14.5 57.35％ Implementation Example 5 33.5 15 55.22％

[0057] As can be seen from Table 1, the shield mud viscosity reducer provided in Examples 1 to 5 of the present invention has excellent viscosity reducing performance. The application of the shield mud viscosity reducer of the present invention in the mud-water shield mud circulation system can effectively solve the problem of mud pipeline blockage caused by mud cake on the cutter head and increased viscosity.

[0058] The technical effects of the present invention are further described below in conjunction with the specific application situations of Examples 1 to 5.

[0059] The shield mud viscosity reducer provided by the present invention is applied to Examples 1 to 5 and compared with the prior art. The specific effect line graph is as follows: Figure 2 As shown. Figure 2 It can be seen that the shield mud viscosity reducer provided in Examples 1 to 5 of the present invention has good viscosity reducing performance.

[0060] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0061] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited by the appended claims.

Claims

1. A shield mud viscosity reducer, characterized in that: The shield mud viscosity reducer is composed of the following components by weight: 0.006-0.03 parts of aluminum sulfate, 0.005-0.025 parts of lignin sulfonate, 0.0008-0.004 parts of sodium polyphosphate, 0.005-0.025 parts of industrial defoamer and 0.0008-0.004 parts of pH adjuster. When used, the ingredients are prepared according to 1 part of mud weight; The aluminum sulfate is Al2(SO4)3·18H2O crystal or crystalline powder, wherein the Al2(SO4)3·18H2O content is ≥50%, the alkali metal and alkaline earth metal content is ≤0.25%, the chloride content is ≤0.002%, the ammonium salt content is ≤0.005%, the iron content is ≤0.003%, the heavy metal content is ≤0.001%, the water-insoluble content is ≤0.02%, and the pH value is ≥2.5; The lignin sulfonate includes one of sodium lignin sulfonate, calcium lignin sulfonate and magnesium lignin sulfonate; The lignin sulfonate C 20 H 24 Na2O 10 S2 or C 20 H 24 CaO 10 S2 or C 20 H 24 MgO 10 S2 content is between 45% and 60%, moisture content is ≤5%, iron content is ≤0.1%, sulfate content is ≤4%, water insoluble content is ≤2%, pH value is between 7 and 9; The sodium polyphosphate is Na5P3O 10 White powder, including Na5P3O 10 The content is between 56% and 60%, the lead content is ≤0.01%, the chloride content is ≤0.01%, the sulfate content is ≤0.1%, the iron content is ≤0.03%, and the water-insoluble content is ≤0.03%.

2. The shield mud viscosity reducer according to claim 1, characterized in that: The industrial defoamer is a liquid industrial grade organosilicon defoamer.

3. The shield mud viscosity reducer according to claim 1, characterized in that: The pH regulator is industrial grade anhydrous sodium carbonate powder, wherein the anhydrous sodium carbonate content is ≥98%, the water insoluble matter content is ≤0.01%, the chloride content is ≤0.002%, the ignition loss is ≤1%, and the sulfur compound content is ≤0.005%.

4. A method for using the shield mud viscosity reducer according to any one of claims 1 to 3, characterized in that: The method for using the shield mud viscosity reducer comprises: taking 50 ml of clean water, adding Al2(SO4)3·18H2O, Na5P3O 10 , lignin sulfonate, industrial defoamer and industrial grade sodium carbonate are stirred evenly to obtain a mixed solution, and the mixed solution is added into a Soderbergh funnel and stirred in the shield mud to complete the treatment.

5. The method for using the shield mud viscosity reducer as claimed in claim 4, characterized in that: Add the mixed solution into the shield mud with a viscosity of 30s to 45s in a Soderbergh funnel and stir for 3-5 minutes.

6. Use of the shield mud viscosity reducer as claimed in any one of claims 1 to 3 in the construction of slurry shield tunnels in urban subways, large-scale river-crossing tunnel projects and water diversion projects.

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