CN114381274A - Foaming agent for improving shield muck of coastal silt soil layer, preparation method and use method - Google Patents
Foaming agent for improving shield muck of coastal silt soil layer, preparation method and use method Download PDFInfo
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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
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/32—Prepolymers; Macromolecular compounds of natural origin, e.g. cellulosic materials
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
- E21D9/0685—Foaming agents
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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
- C09K2103/00—Civil engineering use
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Abstract
The invention discloses a foaming agent for improving shield muck of a coastal silt soil layer, which comprises a foaming agent base solution, a evergreen dispersing agent, powder abelmoschus manihot gum, flaxseed gum and water; the foaming agent base liquid and water are 4-12 parts by volume: 100, the volume part ratio of the liquid additive to water is 2-10: 100, the volume part ratio of the powder additive to water is 0.01-0.12: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1; the foaming agent base solution comprises liquid material alkyl cane glycoside and solid material fatty alcohol-polyoxyethylene ether sodium sulfate, and the volume part ratio is 2.5: 1. The invention also discloses a preparation method and a using method of the composition. The foaming multiplying power of the foaming agent is higher than 25 times, the half-life period is higher than 1500s, the half-life period is zero within 5min, the foam stability is high, the gas-liquid level strength is high, the foam density is high, the foaming agent can enter a soil body gap to improve the soil body flow plasticity, and the adhesion of silt cohesive soil is reduced.
Description
Technical Field
The invention relates to the technical field of engineering construction materials, in particular to a shield muck foaming agent, a preparation method and a use method thereof, which are particularly suitable for coastal silt layers.
Background
The seashore has a deep silt layer, the stratum is complex and severe, the clay content is high, the adhesiveness of the soil layer is very large, the fluidity is poor, the problem of soil block dispersion is difficult to solve by adopting a simple foaming agent, and the problems of mud cake formation, difficult slag discharge and the like are easily caused in shield construction, so that the tunneling efficiency is influenced. Meanwhile, with the rapid development of urban underground engineering construction in China, more and more cases of shield tunneling in coastal silt layers exist, the consumption of foam for improving the silt is high, and the development of a novel foaming agent suitable for the coastal silt layers is urgent. On the basis of the foaming agent, a certain amount of additive is added to develop a novel foaming agent, so that the flow plasticity of the coastal silt soil is improved, the adhesion is reduced, and the problems of cutter head caking, difficult slag discharge and the like are effectively avoided.
Disclosure of Invention
The invention aims to provide a novel foaming agent which is high in cost performance, environment-friendly, stable and reliable and is suitable for a coastal silt soil layer, so as to solve the potential risks caused by large viscosity and lack of flow plasticity of the silt soil body when a shield is tunneled in the coastal silt soil layer.
Therefore, the technical scheme adopted by the invention is as follows: a foaming agent for improving shield muck in a coastal silt soil layer comprises a foaming agent base solution, a liquid material evergreen dispersing agent, powder abelmoschus manihot gum and flaxseed gum which are respectively used as additives, and water; the foaming agent base liquid and water are in a volume ratio of 4-12: 100, the volume part ratio of the liquid additive to water is 2-10: 100, the volume part ratio of the powder additive to water is 0.01-0.12: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1; the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
Meanwhile, the invention also discloses a preparation method of the foaming agent for improving shield muck in the coastal silt soil layer, which comprises the following steps:
(a) preparing foaming agent base liquid by using liquid alkyl sucrose glycoside as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate as an auxiliary foaming agent according to the volume part ratio of 2.5: 1;
(b) firstly, taking a liquid material azure-growing dispersing agent as an additive, wherein the volume part ratio of the additive to water is (2-10): 100 is added into water;
(c) then, taking powder materials of abelmoschus manihot gum and flaxseed gum as additives, wherein the mass part ratio of the additives to water is 0.01-0.12: 100, adding the powder material abelmoschus manihot gum and the flaxseed gum into the water obtained in the step (b), wherein the mass part ratio of the powder material abelmoschus manihot gum to the flaxseed gum is 1: 1;
(d) and finally, according to the volume parts of the foaming agent base liquid and water being 4-12: and (100) slowly adding the water in the step (c) into the foaming agent base liquid, and stirring for more than 30min until the water is uniformly mixed to obtain the foaming agent stock solution.
In addition, the invention also discloses a using method of the foaming agent for improving the shield muck of the coastal silt soil layer, which comprises the following steps:
(1) transporting the prepared foaming agent stock solution to the interior of a shield on a construction site through a foaming solution tank;
(2) and adding water into the foaming agent stock solution for dilution to obtain a final foaming solution for improving the soil body.
Preferably, in the step (2), when the water content of the excavated coastal sludge soil layer is 30-55%, the volume concentration of the foaming agent stock solution is 2-4% and the injection ratio of the foaming solution is 40-60%.
In the step (2), when the water content of the excavated coastal sludge soil layer is lower than 30%, the injection ratio of the foaming solution is more than 60%, or the excavation is carried out by adopting a mode of alternately operating injected water and injected foaming agent.
The invention has the beneficial effects that: the foaming agent has the characteristics of strong foaming capacity and good foam stability, the generated foam particles are uniform, green and pollution-free, more than 99 percent of components can be biodegraded in the exposed air, and the environment is not polluted. The specific beneficial effects of the components are as follows:
1. alkyl sucrose glucoside is used as a main foaming agent. When the concentration of the alkyl cane glycoside is 2-6%, the foaming multiplying power is stable and is about 15 times, and the half-life period is not ideal and is lower than 500 s; the half defoaming rate is more than 30 percent in 5min, and the alkyl cane glycoside is a completely green material foaming agent material which can be completely biodegraded and has low cost. The scheme selects the alkyl cane glycoside as the main foaming agent, and greatly reduces the manufacturing cost by utilizing the advantages of low price and green degradation.
2. Fatty alcohol-polyoxyethylene ether sodium sulfate is used as an auxiliary foaming agent. When the concentration of the sodium alcohol ether sulphate is 2-4%, the foaming multiplying power is higher and is more than 20 times; the half-life performance is generally basically maintained at about 600 s; the defoaming rate is within the interval of 5-10% within 5 min; the material is easy to biodegrade, the natural degradation degree is more than 90%, the environment is not polluted, most of the existing shield muck improvement construction uses the material as a main foaming agent, but the guide concentration is higher and is generally about 10%, but the cost is expensive. The sodium alcohol ether sulphate is colloidal, can not be completely dissolved in water by on-site stirring, still can have a large amount of precipitates after stirring to cause serious waste, and can still not meet the construction requirements by using the half-life period and the defoaming rate within 5min independently, and is usually used as a main foaming agent. The technical scheme selects the sodium alcohol ether sulphate as the auxiliary foaming agent, perfectly avoids the defect of high price, and fully utilizes the characteristic of high foaming multiplying power.
3. The evergreen dispersant is an efficient dispersant, can reduce cohesive force among coastal sludge cohesive soil particles, disperses sludge soil blocks, is colorless and slightly viscous liquid, is easy to dissolve, and has the characteristics of environmental friendliness, economy and the like. The dispersant mainly adsorbs the dispersant molecules on the surface of clay by virtue of the micro-charge matrix acting force of nano-grade material molecules; then, through the osmosis, the dispersant molecules rapidly enter the soil body, and the massive soil body is rapidly dispersed and separated; by shielding negative charges on a soil body, the adhesion of sludge clay to a shield cutter and other machines is reduced, the problem that coastal sludge is still seriously caked when alkyl cane glycoside and fatty alcohol-polyoxyethylene ether sodium sulfate are used independently is perfectly solved, and the construction problems of cutter disc caking, difficult unearthing and the like can be effectively solved.
4. Abelmoschus manihot gum is used as stabilizer. The abelmoschus manihot gum has high viscosity in water, can be used as a thickening agent and a stabilizing agent to improve foam stability, can provide a certain lubricating effect after being dissolved in water, and reduces the friction force between a soil body and a cutter head. However, the abelmoschus manihot gum is mostly applied to food, medicine, daily chemical industry and other industries at present, is not specifically applied to shield muck improvement, is natural and pollution-free, and has low price, so that the environmental problem and the cost problem left by the existing construction can be solved.
5. The flaxseed gum is a stabilizer, is a powdery product prepared by extracting, concentrating and refining flaxseed or seed skin serving as a raw material, can be used as the stabilizer, can promote the foaming of the foam base liquid in the preparation process of the foaming agent, improves the foaming rate, and has a synergistic effect with the foam base liquid; meanwhile, the linseed glue and the abelmoschus manihot gum are matched in a mass ratio of 1:1, so that the half-life period of the foam can be obviously improved, the self-natural environment-friendly abelmoschus manihot gum is natural and pollution-free, and the problem of environmental problems and cost left by the existing construction can be solved due to low price.
In the test process, firstly, alkyl cane glycoside is used as a main foaming agent, fatty alcohol-polyoxyethylene ether sodium sulfate is used as an auxiliary foaming agent, the self-thermal degradation degree of the alkyl cane glycoside is higher than that of the fatty alcohol-polyoxyethylene ether sodium sulfate, the cost of the alkyl cane glycoside is far lower than that of the fatty alcohol-polyoxyethylene ether sodium sulfate, the main foaming agent can improve the overall natural degradation rate of the foaming agent, the production cost is reduced, and the problem of waste caused by the fact that the fatty alcohol-polyoxyethylene ether sodium sulfate cannot be completely dissolved in water is solved to a certain extent.
However, in the test process of continuously adjusting the ratio, the volume part ratio of the alkyl sucrose glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is controlled to be 2.5:1, meanwhile, the abelmoschus manihot gum used in the food industry is creatively introduced into the shield foaming agent as a stabilizer, and is matched with the flaxseed gum in the mass ratio of 1:1, so that the advantages and disadvantages can be well improved, the foaming ratio of the obtained foaming agent is kept to be higher than 20 times, the half-life period is greatly improved to be the lowest value to be higher than 1200s, and a series of problems that the alkyl sucrose glycoside and the fatty alcohol-polyoxyethylene ether sodium sulfate are independently used, or the alkyl sucrose glycoside and the fatty alcohol-polyoxyethylene ether sodium sulfate are mixed to be used, the half-life period is short, the defoaming rate is high in 5min, the cost is high, and the waste caused by precipitation is serious and can not meet the field requirements are perfectly solved.
Aiming at the problems that a coastal silt soil layer has high adhesiveness, so that a cutter head is easy to form mud cakes and difficult to slag, the addition of the evergreen dispersing agent in the test process can further solve the precipitation phenomenon of the solid material fatty alcohol-polyoxyethylene ether sodium sulfate, so that the solid material fatty alcohol-polyoxyethylene ether sodium sulfate can be effectively utilized, and the fluidity of silt soil can be remarkably improved. In the subsequent test process, the linseed glue is tried to be added, the foaming ratio can be further improved, the half-life period lowest value is greatly improved, in the process of continuously adjusting the proportion, when the mass part ratio of the additive powder namely the abelmoschus manihot gum and the linseed glue is 1:1, the foaming ratio and the half-life period of the improved foaming agent reach the optimal values, the foaming ratio is kept to be more than 25 times, and the half-life period lowest value is higher than 1500 s.
In conclusion, the invention is suitable for the improvement construction of the earth pressure balance shield muck in the coastal silt soil layer, the foaming multiplying power of the foaming agent is higher than 25 times, the half-life period is higher than 1500s, the half-life period is zero in 5min, the stability of the generated foam is high, the gas-liquid level strength is high, the foam concentration is high, the foam can enter the gaps of the soil body to improve the flow plasticity of the soil body, the adhesion of the soil body is reduced, and the problems of mud cake formation, difficult slag discharge and the like of the shield cutter head are effectively avoided.
Detailed Description
The invention is further illustrated by the following examples:
a foaming agent for improving shield muck in coastal silt soil layer comprises a foaming agent base solution, a liquid material evergreen dispersing agent, powder Abelmoschus manihot gum and flaxseed gum which are respectively used as additives, and water. The foaming agent base liquid and water are 4-12 parts by volume: 100, the volume part ratio of the liquid additive to water is 2-10: 100, the volume part ratio of the powder additive to water is 0.01-0.12: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1. the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
A preparation method of a foaming agent for improving shield muck of a coastal silt soil layer comprises the following steps:
(a) liquid alkyl sucrose glucoside is used as a main foaming agent, solid fatty alcohol-polyoxyethylene ether sodium sulfate is used as an auxiliary foaming agent, and a foaming agent base solution is prepared according to the volume part ratio of 2.5: 1.
(b) Firstly, taking a liquid material azure-growing dispersing agent as an additive, wherein the volume part ratio of the additive to water is (2-10): 100 are added to the water.
(c) Then, taking powder materials of abelmoschus manihot gum and flaxseed gum as additives, wherein the mass part ratio of the additives to water is 0.01-0.12: 100, adding the powder material abelmoschus manihot gum and the flaxseed gum into the water obtained in the step (b), wherein the mass part ratio of the powder material abelmoschus manihot gum to the flaxseed gum is 1: 1.
(d) and finally, according to the volume parts of the foaming agent base liquid and water being 4-12: and (100) slowly adding the water in the step (c) into the foaming agent base liquid, and stirring for more than 30min until the water is uniformly mixed to obtain the foaming agent stock solution.
A using method of a foaming agent for improving shield muck of a coastal silt soil layer comprises the following steps:
(1) transporting the prepared foaming agent stock solution to the interior of a shield on a construction site through a foaming solution tank;
(2) and adding water into the foaming agent stock solution for dilution to obtain a final foaming solution for improving the soil body.
In the step (2), when the water content of the excavated coastal sludge soil layer is 30-55%, the volume concentration of the foaming agent stock solution is 2-4%, and the injection ratio of the foaming solution is 40-60%; when the water content of the excavated coastal sludge soil layer is lower than 30%, the injection ratio of the foaming solution is more than 60%, or the excavation is carried out by adopting a mode of alternately operating injected water and injected foaming agent, and specific parameters are determined according to specific conditions.
Example 1 a foaming agent for improving shield muck in a coastal silt soil layer, comprising a foaming agent base solution, a liquid material evergreen dispersing agent, powder abelmoschus manihot gum and flaxseed gum as additives respectively, and water. The foaming agent base liquid and the water are in parts by volume of 4: 100, the volume part ratio of the liquid additive to water is 2: 100, the volume part ratio of the powder additive to the water is 0.05: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1. the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
Example 2 a foaming agent for improving shield muck in a coastal silt soil layer, comprising a foaming agent base solution, a liquid material evergreen dispersing agent, powder abelmoschus manihot gum and flaxseed gum as additives, respectively, and water. The foaming agent base liquid and the water are in parts by volume of 4: 100, the volume part ratio of the liquid additive to water is 3: 100, the volume part ratio of the powder additive to the water is 0.05: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1. the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
Example 3 a foaming agent for improving shield muck in a coastal silt soil layer, comprising a foaming agent base solution, a liquid material evergreen dispersing agent, powder abelmoschus manihot gum and flaxseed gum as additives respectively, and water. The foaming agent base liquid and the water are in parts by volume of 4: 100, the volume part ratio of the liquid additive to water is 2: 100, the volume part ratio of the powder additive to the water is 0.075: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1. the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
Example 4 a foaming agent for improving shield muck in a coastal silt soil layer, comprising a foaming agent base solution, a liquid material evergreen dispersing agent, powder abelmoschus manihot gum and flaxseed gum as additives, respectively, and water. The foaming agent base liquid and the water are 6 parts by volume: 100, the volume part ratio of the liquid additive to water is 2: 100, the volume part ratio of the powder additive to the water is 0.05: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1. the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
Comparative example 1 a cohesive soil layer shield muck foaming agent comprising liquid materials of sodium fatty alcohol-polyoxyethylene ether sulfate and water; the volume of the liquid fatty alcohol-polyoxyethylene ether sodium sulfate accounts for 3 percent.
Comparative example 2 a cohesive soil layer shield muck universal foaming agent comprising a liquid material APG2000 and water; the liquid APG2000 accounts for 3 percent of the volume.
Comparative example 3 a cohesive soil layer shield muck foamer comprising a foamer base fluid, a liquid material ultramarine dispersant, powder abelmoschus manihot gum as an additive, and water. The foaming agent base liquid and the water are in parts by volume of 4: 100, the volume part ratio of the liquid additive to water is 2: 100, the mass part ratio of the powder additive to the water is 0.05: 100. the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
Table 1 shows the results of the experiments on the foaming ratio and half-life in a static state of the foaming agents prepared in examples 1 to 4 and the foaming agents prepared in comparative examples 1 to 3:
TABLE 1 foaming Performance test results for different foaming agent types
| Kinds of foaming agents | Expansion ratio | Half-life(s) | Defoaming Rate within 5min (%) |
| Example 1 | 26.87 | 1550 | 0 |
| Example 2 | 26.80 | 1578 | 0 |
| Example 3 | 26.67 | 1921 | 0 |
| Example 4 | 29.31 | 1616 | 0 |
| Comparative example 1 | 17.13 | 616 | 8.23 |
| Comparative example 2 | 16.17 | 652 | 10.28 |
| Comparative example 3 | 23.89 | 1376 | 0 |
As can be seen from Table 1, in examples 1 to 4, compared with comparative examples 1 to 3, the foaming times of the foaming agents prepared according to the formulation ratio of the invention can reach more than 25 times, the half-life period is more than 1500s, and the foaming rate in 5min is almost zero. The stabilizer abelmoschus manihot gum and the flaxseed gum have synergistic effect, the effect is better than that of the abelmoschus manihot gum singly used, and meanwhile, the flaxseed gum can slightly improve the foaming ratio.
In order to further verify the improvement effect of the invention, a plurality of rings are selected for field construction tests. The results show that the formula adopted by the invention obviously reduces the cutter torque, the cutter torque value of the comparative example is 1500-2300 KNm, and the cutter torque value of the embodiment is 1200-1450 KNm; the total thrust of the shield is also reduced; the formula adopted by the invention can effectively reduce the soil body adhesion, reduce the abrasion of the cutter head and the cutter, and reduce the cutter changing frequency, thereby avoiding the occurrence of shield machine halt. The slag temperature can be effectively reduced by adopting the proportion of the invention, the temperature of the slag soil after construction is reduced from 24.6-29.5 ℃ to 21.8-26.7 ℃, and the temperature of the cutter head is prevented from rising too fast when the cutter head is in a coastal sludge soil layer and exceeding the normal working temperature of the cutter head. Meanwhile, the flow plasticity of the muck at the test section is effectively increased by adopting the formula, the slump of the obtained muck is 101-127 mm, under the same stratum and construction conditions, the muck is obviously agglomerated by adopting a clay layer universal foaming agent, the muck sample is dry, the muck is poor in plasticity and fluidity, and the slump of the muck after construction is 0 mm. Through the application of actual engineering, the method has great advantages in the aspects of field construction effect, material price, environmental protection and the like, and has certain guiding significance for actual shield construction.
The raw materials involved in the invention are nontoxic and harmless, can be naturally degraded for the environment, and belong to green materials.
Claims (5)
1. A foaming agent for improving shield muck of a coastal silt soil layer is characterized in that: comprises foaming agent base liquid, liquid material evergreen dispersing agent, powder materials of abelmoschus manihot gum and flaxseed gum which are respectively used as additives and water; the foaming agent base liquid and water are in a volume ratio of 4-12: 100, the volume part ratio of the liquid additive to water is 2-10: 100, the volume part ratio of the powder additive to water is 0.01-0.12: 100, the mass part ratio of powder abelmoschus manihot gum to flaxseed gum is 1: 1; the foaming agent base solution comprises liquid alkyl cane glycoside serving as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate serving as an auxiliary foaming agent, wherein the volume part ratio of the alkyl cane glycoside to the fatty alcohol-polyoxyethylene ether sodium sulfate is 2.5: 1.
2. A preparation method of a foaming agent for improving shield muck in a coastal silt soil layer is characterized by comprising the following steps:
(a) preparing foaming agent base liquid by using liquid alkyl sucrose glycoside as a main foaming agent and solid fatty alcohol-polyoxyethylene ether sodium sulfate as an auxiliary foaming agent according to the volume part ratio of 2.5: 1;
(b) firstly, taking a liquid material azure-growing dispersing agent as an additive, wherein the volume part ratio of the additive to water is (2-10): 100 is added into water;
(c) then, taking powder materials of abelmoschus manihot gum and flaxseed gum as additives, wherein the mass part ratio of the additives to water is 0.01-0.12: 100, adding the powder material abelmoschus manihot gum and the flaxseed gum into the water obtained in the step (b), wherein the mass part ratio of the powder material abelmoschus manihot gum to the flaxseed gum is 1: 1;
(d) and finally, according to the volume parts of the foaming agent base liquid and water being 4-12: and (100) slowly adding the water in the step (c) into the foaming agent base liquid, and stirring for more than 30min until the water is uniformly mixed to obtain the foaming agent stock solution.
3. A using method of a foaming agent for improving shield muck in a coastal silt soil layer is characterized by comprising the following steps:
(1) transporting the prepared foaming agent stock solution of claim 1 or 2 to the interior of a shield at a construction site through a foaming solution tank;
(2) and adding water into the foaming agent stock solution for dilution to obtain a final foaming solution for improving the soil body.
4. The method for using the foaming agent for improving the shield muck of the coastal silt soil layer according to claim 3, wherein in the step (2), when the water content of the excavated coastal silt soil layer is 30-55%, the volume concentration of the foaming agent stock solution is 2-4% and the injection ratio of the foaming solution is 40-60%.
5. The method of using the foaming agent for shield muck improvement in the coastal sludge soil layer as claimed in claim 3, wherein in the step (2), when the water content of the excavated coastal sludge soil layer is less than 30%, the excavation is performed by using a foaming solution injection ratio of more than 60% or by using a water injection and foaming agent injection alternating operation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147779A (en) * | 2023-11-01 | 2023-12-01 | 中铁九局集团第四工程有限公司 | Residue soil improvement method suitable for clay stratum shield construction |
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