CN115960588A - Environment-friendly slurry prepared from seawater and used for seabed slurry shield tunnel - Google Patents
Environment-friendly slurry prepared from seawater and used for seabed slurry shield tunnel Download PDFInfo
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- CN115960588A CN115960588A CN202211390701.1A CN202211390701A CN115960588A CN 115960588 A CN115960588 A CN 115960588A CN 202211390701 A CN202211390701 A CN 202211390701A CN 115960588 A CN115960588 A CN 115960588A
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Abstract
The invention belongs to the field of slurry shield construction application materials, and provides environment-friendly slurry prepared from seawater for a seabed slurry shield tunnel, which comprises the following components in parts by weight: 140 parts of bentonite, 10-40 parts of xanthan gum, 10-40 parts of flaxseed gum and 860 parts of seawater. The invention is characterized in that seawater is adopted to replace the traditional fresh water for preparing the slurry, and green and environment-friendly salt-resistant additives, namely flaxseed gum and xanthan gum, are used. The slurry disclosed by the invention can realize the effects of tackifying, resisting pollution and improving the rheological behavior and physical stability of the slurry, and is beneficial to forming a high-quality mud film and maintaining the stability of an excavation surface; has the advantages of environmental protection, convenient local material taking, engineering cost saving and fresh water resource saving.
Description
Technical Field
The invention belongs to a slurry shield construction application material, and particularly relates to environment-friendly slurry for a seabed slurry shield tunnel prepared from seawater.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In the construction process of the slurry balance shield, the supporting slurry plays a crucial role: the mud seeps into the stratum under the pressure action of the mud water cabin, and a layer of dynamic mud film is formed on the excavation surface so as to balance the water and soil pressure in the stratum and maintain the stability of the tunnel face; the mud has certain sand carrying capacity and can carry the soil residues to the ground. Therefore, a good-performance mud film is one of the necessary conditions for the smooth progress of the slurry shield construction.
During the construction of the slurry shield of the submarine tunnel, a large amount of metal cations such as Mg exist in seawater 2+ 、Ca 2+ Etc. these cations will react with Na adsorbed on the bentonite particles + Exchange to cause the viscosity of the slurry to drop sharply, and simultaneously, cl in the seawater - The ions make the mud particles susceptible to flocculation into aggregates, resulting in rapid settling. The viscosity, rheological property and physical stability of the slurry are greatly deteriorated in the seawater environment, the performances of the slurry for carrying slag and maintaining stability of an excavation surface are greatly reduced and even lost, and the performance of the conventional fresh water slurry can not meet the construction requirements of a submarine slurry shield tunnel; the fresh water resources are limited by the stock and space transportation, and the construction cost is greatly increased; in addition, the traditional high polymer pulping materials (such as CMC, PAC and the like) cause water and soil environment along with the discharge of waste pulpAnd is very polluted.
Disclosure of Invention
In order to overcome the defects in the background art, the invention provides the environment-friendly slurry for the submarine slurry shield tunnel prepared by adopting seawater, the slurry is prepared by adopting seawater, and the effects of tackifying, resisting pollution and improving rheological behavior and physical stability of the slurry are realized by combining the green environment-friendly salt-resistant additive linseed gum and the xanthan gum.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides environment-friendly slurry prepared from seawater for a submarine slurry shield tunnel, which comprises the following raw materials in parts by weight: 140 parts of bentonite, 10-40 parts of xanthan gum, 10-40 parts of flaxseed gum and 860 parts of seawater.
The research finds that: the seawater and the green and environment-friendly salt-resistant additive are adopted to prepare the slurry, so that great economic benefits can be brought to the submarine slurry shield tunnel engineering, and pollution to the stratum can be avoided. Therefore, the environment-friendly slurry formula for the submarine slurry shield tunnel prepared from seawater is developed, the rheological property and the physical stability of the slurry in a seawater environment can be improved, local materials are convenient to obtain, a large amount of fresh water resources are saved, the construction cost is reduced, and the environment-friendly concept is met.
In a second aspect of the present invention, there is provided a method for preparing an environmentally friendly slurry for a submarine slurry shield tunnel using seawater, comprising:
adding bentonite into seawater, mixing, adding xanthan gum, mixing, and adding linseed gum to obtain mixed slurry;
and stirring the mixed slurry at a high speed, and standing to obtain the high-performance composite material.
The invention has the advantages of
(1) The green environment-friendly salt-resistant additive xanthan gum and flaxseed gum are anionic polysaccharide and have the functions of thickening, emulsifying, suspending, stabilizing and the like. Xanthan gum and flaxseed gum moleculesThe hydroxyl groups on the sodium bentonite can be combined with the hydroxyl groups of the sodium bentonite to form intramolecular hydrogen bonds, so that the sodium bentonite can be bonded around the sodium bentonite molecules to provide a protection effect for the sodium bentonite particles; cl in seawater - The compression effect on the electric double-layer structure of the bentonite particles is weakened, the hydration layer is thickened, the swelling property of the sodium bentonite particles is ensured, and the viscosity of the slurry is increased. The glucuronic acid groups on the side chains of the xanthan gum molecules and the galacturonic acid groups on the main chains of the linseed gum molecules both have negative charges, so that sodium bentonite particles with positive charges can be adsorbed, the particles are kept suspended in the slurry, and the stability of the seawater slurry is improved.
In addition, the strongly polar groups-COOH, -OH of xanthan and linseed gum molecules can interact with Ca in seawater 2+ 、Mg 2 + The metal ions react to play a role in adsorption and removal, so that slurry particles can be uniformly dispersed in the slurry; meanwhile, exchangeable cations in the bentonite are prevented from being replaced by the cations, the difference of ion concentration in the solution is reduced, and the property of seawater mud is improved.
(2) The method can effectively relieve the deterioration of high-valence metal ions in the seawater on the viscosity, physical stability and rheological property of the slurry, is green and environment-friendly, has simple process and convenient operation, is particularly suitable for the submarine slurry shield tunnel engineering, can use the seawater as the local material for preparing the slurry, and reduces the engineering cost.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The environment-friendly slurry formula for the seabed slurry shield tunnel prepared from seawater comprises the following components in parts by weight: 140 parts of bentonite, 10-40 parts of xanthan gum, 10-40 parts of flaxseed gum and 860 parts of seawater.
In some embodiments, the environment-friendly slurry formula for the submarine shield tunnel prepared from seawater is prepared from the following raw materials in parts by weight: 140 parts of bentonite, 40 parts of flaxseed gum and 860 parts of seawater.
In some embodiments, the environment-friendly slurry formula for the submarine shield tunnel prepared from seawater is prepared from the following raw materials in parts by weight: 140 parts of bentonite, 40 parts of xanthan gum, 10 parts of flaxseed gum and 860 parts of seawater.
In some embodiments, the environment-friendly slurry formula for the submarine shield tunnel prepared from seawater is prepared from the following raw materials in parts by weight: 140 parts of bentonite, 30 parts of xanthan gum, 20 parts of flaxseed gum and 860 parts of seawater.
In some embodiments, the environment-friendly slurry formula for the submarine shield tunnel prepared from seawater is prepared from the following raw materials in parts by weight: 140 parts of bentonite, 20 parts of xanthan gum, 30 parts of flaxseed gum and 860 parts of seawater.
In some embodiments, the environment-friendly slurry formula for the submarine shield tunnel prepared from seawater is prepared from the following raw materials in parts by weight: 140 parts of bentonite, 10 parts of xanthan gum, 40 parts of flaxseed gum and 860 parts of seawater.
In some embodiments, the bentonite is sodium bentonite.
The invention provides a method for preparing environment-friendly slurry for a seabed slurry shield tunnel by adopting seawater, which comprises the following steps:
(1) Weighing the components according to the composition of the raw materials;
(2) Adding a certain amount of seawater into the small beaker, and adding a certain amount of bentonite into the small beaker under continuous stirring;
(3) Adding a certain amount of xanthan gum into a small beaker under continuous stirring;
(4) Adding a certain amount of flaxseed gum into the small beaker under continuous stirring;
(5) Placing the slurry in a magnetic stirrer, and stirring for 30 minutes;
(6) Standing for 24 hours to prepare the environment-friendly slurry formula for the submarine slurry shield tunnel prepared by adopting seawater.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
the environment-friendly slurry prepared from seawater for the seabed slurry shield tunnel comprises the following components in parts by weight:
140 parts of sodium bentonite, 40 parts of flaxseed gum and 860 parts of seawater. The seawater mud is prepared according to the following mixture ratio:
(1) 860 parts of seawater is added into a stirring barrel;
(2) Slowly adding 140 parts of sodium bentonite into a stirring barrel, and uniformly stirring;
(4) Slowly adding 40 parts of flaxseed gum into a stirring barrel while stirring;
(5) Uniformly mixing and stirring the mixture for 30min under the condition that the rotating speed is 700r/min to obtain pretreated seawater mud;
(6) Standing for 24 hours to prepare the slurry formula for the submarine slurry shield tunnel prepared by adopting the seawater.
Example 2:
an environment-friendly slurry prepared from seawater for a seabed slurry shield tunnel comprises the following components in parts by weight:
140 parts of sodium bentonite, 40 parts of xanthan gum, 10 parts of flaxseed gum and 860 parts of seawater. The seawater mud is prepared according to the following mixture ratio:
(1) Adding 860 parts of seawater into a stirring barrel;
(2) Slowly adding 140 parts of sodium bentonite into a stirring barrel, and uniformly stirring;
(4) Slowly adding 40 parts of xanthan gum into a stirring barrel while stirring;
(5) Slowly adding 10 parts of flaxseed gum into a stirring barrel while stirring;
(6) Uniformly mixing and stirring for 30min under the condition that the rotating speed is 700r/min to obtain pretreated seawater slurry;
(7) And standing for 24 hours to prepare the slurry formula for the submarine slurry shield tunnel prepared by using the seawater.
Example 3:
the environment-friendly slurry prepared from seawater for the seabed slurry shield tunnel comprises the following components in parts by weight:
140 parts of sodium bentonite, 30 parts of xanthan gum, 20 parts of flaxseed gum and 860 parts of seawater. The seawater mud is prepared according to the following mixture ratio:
(1) Adding 860 parts of seawater into a stirring barrel;
(2) Slowly adding 140 parts of sodium bentonite into a stirring barrel, and uniformly stirring;
(4) Slowly adding 30 parts of xanthan gum into a stirring barrel while stirring;
(5) Slowly adding 20 parts of flaxseed gum into a stirring barrel while stirring;
(6) Uniformly mixing and stirring for 30min under the condition that the rotating speed is 700r/min to obtain pretreated seawater slurry;
(7) Standing for 24 hours to prepare the slurry formula for the submarine slurry shield tunnel prepared by adopting the seawater.
Example 4:
the environment-friendly slurry prepared from seawater for the seabed slurry shield tunnel comprises the following components in parts by weight:
140 parts of sodium bentonite, 20 parts of xanthan gum, 30 parts of flaxseed gum and 860 parts of seawater. The seawater mud is prepared according to the following mixture ratio:
(1) 860 parts of seawater is added into a stirring barrel;
(2) Slowly adding 140 parts of sodium bentonite into a stirring barrel, and uniformly stirring;
(4) Slowly adding 20 parts of xanthan gum into a stirring barrel while stirring;
(5) Slowly adding 30 parts of flaxseed gum into a stirring barrel while stirring;
(6) Uniformly mixing and stirring the mixture for 30min under the condition that the rotating speed is 700r/min to obtain pretreated seawater mud;
(7) Standing for 24 hours to prepare the slurry formula for the submarine slurry shield tunnel prepared by adopting the seawater.
Example 5:
the environment-friendly slurry prepared from seawater for the seabed slurry shield tunnel comprises the following components in parts by weight:
140 parts of sodium bentonite, 10 parts of xanthan gum, 40 parts of flaxseed gum and 860 parts of seawater. The seawater mud is prepared according to the following mixture ratio:
(1) Adding 860 parts of seawater into a stirring barrel;
(2) Slowly adding 140 parts of sodium bentonite into a stirring barrel, and uniformly stirring;
(4) Slowly adding 10 parts of xanthan gum into a stirring barrel while stirring;
(5) Slowly adding 40 parts of flaxseed gum into a stirring barrel while stirring;
(6) Uniformly mixing and stirring the mixture for 30min under the condition that the rotating speed is 700r/min to obtain pretreated seawater mud;
(7) Standing for 24 hours to prepare the slurry formula for the submarine slurry shield tunnel prepared by adopting the seawater.
And (4) performance testing:
the slurries prepared in examples 1 to 5 were tested for their properties and compared with conventional slurries containing no salt-resistant additives. The specific detection method comprises the following steps:
(1) Density: the density of the slurry is measured by a hydrometer, and the unit is g/cm 3 。
(2) Fluidity: the apparent viscosity of the sample was measured in mPas using RST-CC rheometer.
(3) Stability: pour 100 ml of slurry into 100 ml graduated cylinder, cover glass plate, stand for 24 hours and read the slurry settlement scale.
(4) Rheological properties: and obtaining the change condition of the slurry shear stress along with the shear rate by adopting a RST-CC rheometer and a data acquisition system, and determining a slurry rheological model by a fitting method.
The mud obtained in examples 1 to 5 and the conventional mud were tested for the following properties as shown in Table 1 below.
TABLE 1
Note: in Table 1, the viscosity is maintained constant for the rotation speed, i.e., the shear rate is 1000s -1 The viscosity of the slurry.
(1) Density contrast
The slurries described in examples 1 to 5 have a higher density than conventional slurries, and it is sufficient to show that the slurries described in examples 1 to 5 have a good density in a seawater environment, which is advantageous for forming a mud film and maintaining the stability of the tunnel face.
(2) Flow comparison
Shear rate of 1000s -1 Compared with the common slurry, the slurry disclosed in the embodiments 1 to 5 has higher apparent viscosity, which fully shows that the slurry disclosed in the embodiments 1 to 5 still has good viscosity in the seawater environment, is beneficial to forming a sludge film and has more excellent slag carrying capacity.
(3) Comparison of stability
The colloid rate of the common slurry after standing for 2 hours is greatly lower than 95 percent required in engineering; the colloidal fraction of the slurry of examples 1-5 after standing for 2 hours was greater than 95%, which fully demonstrates the good dispersibility and physical stability of the slurry of examples 1-5.
(4) Comparison of rheological Properties
The rheological curve of the ordinary slurry conforms to the Power Law model, and the yield stress of the slurry disappears; the rheological curves of the slurries described in examples 1 to 5 follow the Herschel Bulkley model, and the non-Newtonian behaviour of the slurries becomes more pronounced, showing pseudoplastic flow behaviour with decreasing viscosity with increasing shear rate. It is shown that the mud formulations described in examples 1-5 have desirable rheological properties in a seawater environment.
And (4) conclusion: the slurry can effectively relieve the deterioration of high-valence metal ions in seawater on the viscosity, physical stability and rheological property of the slurry, has simple process and convenient operation, is particularly suitable for the submarine slurry shield tunnel engineering, can prepare the slurry by using seawater as a local material, and reduces the engineering cost.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The environment-friendly slurry prepared from seawater for the seabed slurry shield tunnel is characterized by comprising the following raw materials in parts by weight: 140 parts of bentonite, 10-40 parts of xanthan gum, 10-40 parts of flaxseed gum and 860 parts of seawater.
2. The environment-friendly slurry prepared from seawater for the submarine slurry shield tunnel according to claim 1, which comprises the following raw materials in parts by weight: 140 parts of bentonite, 10-20 parts of xanthan gum, 30-40 parts of flaxseed gum and 860 parts of seawater.
3. The environment-friendly slurry prepared from seawater for the submarine slurry shield tunnel according to claim 1, which comprises the following raw materials in parts by weight: 140 parts of bentonite, 20-30 parts of xanthan gum, 20-30 parts of flaxseed gum and 860 parts of seawater.
4. The environment-friendly slurry prepared from seawater for the submarine slurry shield tunnel according to claim 1, which is prepared from the following raw materials in parts by weight: 140 parts of bentonite, 30-40 parts of xanthan gum, 10-20 parts of flaxseed gum and 860 parts of seawater.
5. The environment-friendly slurry for a submarine slurry shield tunnel according to claim 1, which is prepared from 140 parts of bentonite, 40 parts of flaxseed gum and 860 parts of seawater.
6. The environmentally friendly slurry for a submarine slurry shield tunnel according to claim 1, which is prepared from seawater, wherein the bentonite is sodium bentonite.
7. The environment-friendly slurry for a submarine slurry shield tunnel according to claim 1, which is prepared from seawater, wherein the density of the seawater is 1.03 to 1.06g/cm 3 The pH value is 7.8-8.3.
8. The environmentally friendly slurry for a submarine slurry shield tunnel according to claim 1, which is prepared from seawater, wherein the seawater is from yellow sea of China.
9. A method for preparing environment-friendly slurry for a submarine slurry shield tunnel by using seawater is characterized by comprising the following steps:
adding bentonite into seawater, mixing, adding xanthan gum, mixing, adding flaxseed gum, and mixing to obtain mixed slurry;
and stirring the mixed slurry at a high speed, and standing to obtain the high-performance composite material.
10. The method for preparing the environmentally friendly slurry for the submarine slurry shield tunnel according to claim 9, wherein the specific conditions for the high-speed stirring are; stirring at 700-800 r/min for 20-30 min.
11. The method for preparing the environment-friendly slurry for the submarine slurry shield tunnel according to claim 9, wherein the specific time for standing is 24-32 hours.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109133737A (en) * | 2018-08-22 | 2019-01-04 | 天津大学 | A kind of salt resistance mud and preparation method thereof being adapted to seabed shield-tunneling construction |
| CN109180090A (en) * | 2018-08-29 | 2019-01-11 | 佛山市禅城区诺高环保科技有限公司 | A kind of environmental protection slurry coat method and preparation method thereof |
| CN112592138A (en) * | 2020-12-31 | 2021-04-02 | 中铁十局集团有限公司 | Single-component active synchronous mortar with controllable setting time and preparation method thereof |
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- 2022-11-07 CN CN202211390701.1A patent/CN115960588A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109133737A (en) * | 2018-08-22 | 2019-01-04 | 天津大学 | A kind of salt resistance mud and preparation method thereof being adapted to seabed shield-tunneling construction |
| CN109180090A (en) * | 2018-08-29 | 2019-01-11 | 佛山市禅城区诺高环保科技有限公司 | A kind of environmental protection slurry coat method and preparation method thereof |
| CN112592138A (en) * | 2020-12-31 | 2021-04-02 | 中铁十局集团有限公司 | Single-component active synchronous mortar with controllable setting time and preparation method thereof |
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