CN-121974612-A - Double-component shield synchronous grouting material suitable for coastal area preparation and preparation method thereof

CN121974612ACN 121974612 ACN121974612 ACN 121974612ACN-121974612-A

Abstract

The invention belongs to the technical field of shield tunnel synchronous grouting materials, and particularly relates to a two-component shield synchronous grouting material suitable for coastal area preparation and a preparation method thereof. The double-component shield synchronous grouting material adopts seawater to replace partial fresh water and adds components such as a modifier, a retarder, a stabilizer, a catalyst and the like, so that the grouting material is suitable for coastal area preparation, fresh water resources and transportation cost can be saved, and the grouting material has good performance and better durability and is suitable for shield construction popularization and application in coastal areas.

Inventors

JIANG HUA
ZHANG HUIWEN
ZHAO YINGJIE
WEI CHI
LI XIANG
MIN FANLU
GUO YONGJIAN
YAO ZHANHU
GAN CONGYU
LI ZHEN
Ye Zhangjian
CAI HONGWEI

Assignees

青岛国信胶州湾第二海底隧道有限公司
中交隧道工程局有限公司
河海大学

Dates

Publication Date: 20260505
Application Date: 20251205

Claims (10)

1. The two-component shield synchronous grouting material suitable for coastal area preparation comprises, by weight, 100 parts of cement, 6-27 parts of bentonite, 50-320 parts of fresh water, 30-180 parts of sea water, 1-3 parts of retarder, 0.1-0.6 part of Na 2 CO 3 and 0.1-0.5 part of stabilizer, wherein the second component of the synchronous grouting material comprises water glass and nano titanium dioxide, the weight ratio of the water glass to the nano titanium dioxide is 100 (2-3), and the synchronous grouting material is prepared by mixing, by weight, 100 parts of the first component and 6-10 parts of the second component.
2. A two-component shield synchronous grouting material suitable for coastal region preparation according to claim 1, wherein the cement is portland cement.
3. The two-component shield synchronous grouting material suitable for coastal region preparation according to claim 2, wherein the Portland cement density is 2800-3200 kg/m 3 , the initial setting time is 150-200 s, the final setting time is 200-300 s, and the compressive strength is 40-60 MPa.
4. The two-component shield synchronous grouting material suitable for coastal area preparation according to claim 1, wherein the bentonite is sodium bentonite.
5. The two-component shield synchronous grouting material suitable for coastal region preparation according to claim 4, wherein the sodium bentonite has a viscosity of 10-20mpa.s and a screen residue of 75 μm of 2-4%.
6. The two-component shield synchronous grouting material suitable for coastal area preparation according to claim 1, wherein the retarder is one or more selected from sodium gluconate, sodium citrate, glycerol, modified phosphogypsum, lignin, barium chloride and sodium tetraborate.
7. The two-component shield synchronous grouting material suitable for coastal area preparation according to claim 1, wherein the stabilizer is one or more selected from sodium carboxymethyl cellulose, xanthan gum, guar gum and pure acrylic emulsion powder.
8. The two-component shield synchronous grouting material suitable for coastal region preparation according to claim 1, wherein the Baume degree of the water glass is 35-50 0 Be.
9. The method for preparing the two-component shield synchronous grouting material suitable for coastal area preparation according to any one of claims 1-8, wherein the method for preparing the slurry of the first component comprises the following steps: The preparation of bentonite slurry, namely mixing bentonite with fresh water, and stirring to prepare bentonite slurry; the preparation of cement slurry, which is to mix and stir seawater and Na 2 CO 3 to modify seawater, then mix and stir the rest materials to prepare cement slurry; And mixing and stirring bentonite slurry and cement slurry to prepare slurry of a first component.
10. The method of preparing the slurry of the second component according to claim 9, wherein the method of preparing the slurry of the second component comprises the steps of mixing and stirring water glass and nano titanium dioxide.

Description

Double-component shield synchronous grouting material suitable for coastal area preparation and preparation method thereof Technical Field The invention belongs to the technical field of shield tunnel synchronous grouting materials, and particularly relates to a two-component shield synchronous grouting material suitable for coastal area preparation and a preparation method thereof. Background The two-component synchronous grouting material is used as a process material for grouting after a shield wall, and is popularized and applied in the construction of large-scale underwater shield tunnels due to the excellent performance. Along with the increase of the cross-sea traffic tunnel engineering, the two-component synchronous grouting material suitable for coastal area preparation becomes the front edge of research and development. The traditional double-component synchronous grouting material generally needs to be prepared by using a large amount of fresh water resources, so that the consumption of the fresh water resources is caused, and the seawater erosion easily causes the material performance reduction (the complex ion environment in the seawater easily damages soil slurry and the like, and the performance and durability of the material are reduced). Patent document CN117185759a discloses a synchronous grouting material for shield tunnel in coastal region, which still needs to be prepared by fresh water, needs a large amount of sea sand, cannot meet the requirement of marine environment protection, and is difficult to be prepared in coastal region with lack of fresh water resource. Patent document CN110922947a discloses an additive for reducing the suppression of swelling property of bentonite by seawater, and a large amount of synthetic resin is required to cause significant increase of engineering cost. At present, the research on preparing the double-component synchronous grouting material by the seawater is seriously insufficient. Therefore, the problems of working performance, transportation cost, engineering cost and the like are comprehensively considered, and the development of the double-component synchronous grouting material which has low cost and high performance and is suitable for being prepared in coastal areas and reducing fresh water consumption is continued. Disclosure of Invention Aiming at the problems, the invention aims to provide a two-component shield synchronous grouting material suitable for coastal area preparation and a preparation method thereof. The technical scheme of the invention is as follows: The double-component shield synchronous grouting material suitable for coastal area preparation comprises, by weight, 100 parts of cement, 6-27 parts of bentonite, 50-320 parts of fresh water, 30-180 parts of sea water, 1-3 parts of retarder, 0.1-0.6 part of Na 2CO3 and 0.1-0.5 part of stabilizer, wherein the second component of the synchronous grouting material comprises water glass and nano titanium dioxide, the weight ratio of the water glass to the nano titanium dioxide is 100 (2-3), and the synchronous grouting material is prepared by mixing, by weight, 100 parts of the first component and 6-10 parts of the second component. Preferably, the cement is Portland cement. Further preferably, the density of the Portland cement is 2800-3200 kg/m 3, the initial setting time is 150-200 s, the final setting time is 200-300 s, and the compressive strength is 40-60 MPa. Preferably, the bentonite is sodium bentonite. Further preferably, the viscosity of the sodium bentonite is 10-20mPa.s, and the screen residue of 75 μm is 2-4%. Preferably, the retarder is one or more selected from sodium gluconate, sodium citrate, glycerol, modified phosphogypsum, lignin, barium chloride and sodium tetraborate. Preferably, the stabilizer is selected from one or more of sodium carboxymethyl cellulose, xanthan gum, guar gum and pure acrylic emulsion powder. Preferably, the Baume degree of the water glass is 35-50 o Be. The invention also provides a preparation method of the double-component shield synchronous grouting material, and the preparation method of the slurry of the first component comprises the following steps: The preparation of bentonite slurry, namely mixing bentonite with fresh water, and stirring to prepare bentonite slurry; the preparation of cement slurry, which is to mix and stir seawater and Na 2CO3 to modify seawater, then mix and stir the rest materials to prepare cement slurry; And mixing and stirring bentonite slurry and cement slurry to prepare slurry of a first component. The preparation method of the second-component slurry comprises the following steps of mixing and stirring water glass and nano titanium dioxide to prepare the second-component slurry. When in use, the slurry of the first component and the slurry of the second component are mixed and stirred. Advantageous effects The invention has the technical advantages that the grouting material can prepare the double-component