Double-liquid grouting slurry, its technology and application for super large diameter underwater shield engineering under high water pressure condition

Patent metadata

Field	Value
Publication number	US-2023212076-A1
Application number	US-202218089531-A
Country	US
Kind code	A1
Filing date	Dec 27, 2022
Priority date	Dec 31, 2021
Publication date	Jul 6, 2023
Grant date	—

Abstract

This invention discloses a double-liquid grouting slurry, its technology and application for super large diameter underwater shield engineering under high water pressure condition. The materials of slurry I are: 35-45 parts of cement clinker; 15-25 parts of slag; 24-35 parts of fly ash; 15-25 parts of steel slag; 5-15 parts of bentonite; 4-10 parts of limestone tailing; 0.3-2.0 parts of water reducing agent; 0.5-2.5 parts of cellulose. The materials of slurry II are: 0.2-3.8 parts of short-cut fiber; 96-99 parts of sodium silicate solution; 0.8-4.8 parts of viscous polymers. This invention generates the double-liquid slurry preparation process including crushing-screening-milling-group mixing-grouped mixing at different speeds, the volume ratio of slurry I and II is 1:1-10:1 during grouting, and the slurry is injected into the shield void through the six-point position technology at the shield tail and 3+2+1 segment splicing synchronous grouting techniques.

First claim

What is claimed is:

1 . A double-liquid grouting slurry for super large diameter underwater shield engineering under high water pressure condition, comprising slurry I and slurry II,
wherein slurry I comprises the following raw materials in weight: 35-45 parts of silicate cement clinker, 15-25 parts of granulated blast furnace slag, 24-35 parts of fly ash, 15-25 parts of steel slag, 5-15 parts of bentonite, 4-10 parts of limestone tailing powder, 0.3-2.0 parts of water reducing agent, 0.5-2.5 parts of cellulose, and an amount of water meets the water-binder ratio (w/b) of 0.8:1-1.5:1, wherein the slurry II comprises the following raw materials in weight: 0.2-3.8 parts of short-cut fiber, 96-99 parts of sodium silicate solution, 0.8-4.8 parts of viscous polymer, wherein the water reducing agent is a mixture of naphthalene water reducing agent and polycarboxylic acid water reducing agent with a mass ratio of 3:1-3:2, wherein the short-cut fiber is a mixture of short-cut basalt fiber and short-cut polypropylene fiber with a mass ratio of 2:1-3:1, wherein the viscous polymer is a mixture of acrylate polymer, ethylene vinyl acetate copolymer and polyvinyl alcohol with a mass ratio of 1:1:1-1:2:1, wherein a volume ratio of slurry I to slurry II is 1:1-10:1.

2 . The double-liquid grouting slurry according to claim 1 , wherein a diameter of the basalt fiber is 7-20 μm, a length of a monofilament of the basalt fiber is 5-20 mm, a density of the basalt fiber is 2-3 g/cm 3 , and a diameter of the polypropylene fiber is 9-30 μm, a length of a monofilamen of the polypropylene fiber is 3-8 mm, a density of the polypropylene fiber is 1-2 g/cm 3 .

3 . The double-liquid grouting slurry according to claim 1 , wherein the bentonite is a sodium-based bentonite, the cellulose is a hydroxypropylmethyl cellulose with a viscosity of 100,000, and a Baume degree of the sodium silicate solution is 35-40° Bé.

4 . The double-liquid grouting slurry according to claim 1 , wherein a sieving residue of the silicate cement clinker through 80 μm sieve is not more than 4%; a density of the granulated blast furnace slag is not less than 2.8 g/cm 3 , a specific surface area of the granulated blast furnace slag is not less than 400 m 2 /kg, a water content of the granulated blast furnace slag is not more than 1%; the fly ash is a secondary ash, a sieving residue of the fly ash through 45 μm sieve is 12-20%, a water demand ratio of the fly ash is 95-100%, a water content of the fly ash is not more than 1%; a specific surface area of the steel slag powder is not less than 350 m 2 /kg, a content of free calcium oxide of the steel slag powder is not more than 3%; a calcium carbonate mass fraction in the limestone tailing powder is not less than 80%, and a mass fraction of aluminum oxide in the limestone tailing powder is not more than 2%.

5 . A preparation method for the double-liquid grouting slurry for super large diameter underwater shield engineering under high water pressure condition, according to claim 1 , comprising:
(1) silicate cement clinker, granulated blast furnace slag, steel slag, and limestone tailings being crushed respectively, then ball-milled until maximum particle sizes being less than 120 μm, and then being dried and placed at room temperature respectively for later use, (2) the grounded silicate cement clinker powder and granulated blast furnace slag powder being mixed and stirred at 150-250 r/min for 60-80 s to obtain a homogeneous mixture I, (3) fly ash, steel slag powder, bentonite and limestone tailing powder being mixed, and stirred at 150-250 r/min for 60-80 s to obtain a homogeneous mixture II, (4) water-reducing agent being mixed with a first portion of water and being stirred at 350-450 r/min for 20-30 s to obtain an admixture I solution; cellulose being mixed with a second portion of water and stirred at 350-450 r/min for 20-30 s to obtain the admixture II solution, (5) the remaining water, the mixture I and the mixture II being stirred at 450-550 r/min for 120-140 s to obtain mixture III, (6) the admixture I solution and the admixture II solution being added to the mixture III in step (5), being mixed and stirred at 450-550 r/min for 120-180 s to obtain slurry I, (7) viscous polymers being added to a sodium silicate solution, and being stirred at 550-700 r/min for 120-150 s to obtain liquid mixture IV, (8) short-cut fibers being added to liquid mixture IV, and being stirred at 550-700 r/min for 150-180 s to obtain slurry II.

6 . An application of the double-liquid grouting slurry for super large diameter underwater shield engineering under high water pressure condition according to claim 1 , wherein the double-liquid grouting slurry is applied for underwater shield tunneling with subsurface water pressure greater than or equal to 0.5 MPa, and diameter greater than or equal to 14 m, wherein during underwater shield tunneling, applicable strata include high water-pressure fine-medium-coarse sand strata, high water-pressure cohesive soil strata, and high water-pressure silt sand strata.

7 . A double-liquid grouting process for super large diameter underwater shield engineering under high water pressure condition, comprising:
a double-liquid grouting slurry according to claim 1 being added to a synchronous grouting system for shield synchronous grouting, wherein a volume ratio of slurry I to slurry II is 1:1-10:1.

8 . The double-liquid grouting process according to claim 7 , wherein a volume ratio of slurry I to slurry II is 3:1-10:1.

9 . The double-liquid grouting process according to claim 7 , wherein the synchronous grouting system comprises 6 synchronous grouting units, wherein each of the synchronous grouting unit comprises a double-liquid slurry delivery pipe, the double-liquid slurry delivery pipe is provided with a slurry I inlet and a scouring liquid inlet, the slurry I inlet and the scouring liquid inlet are connected with a slurry I delivery pipe and a scouring liquid delivery pipe respectively, the slurry I delivery pipe is connected with a slurry I storage tank, the scouring liquid delivery pipe is connected with scouring liquid storage tank; the slurry I delivery pipe is provided with a slurry II inlet, the slurry II inlet is connected to a slurry II delivery pipe, the slurry II delivery pipe is connected with a slurry II storage tank, and the slurry II delivery pipe has a first injection port at an outlet of the slurry II delivery pipe; the double-liquid slurry delivery pipe is equipped with a mixing and stirring pump that moves along the double-liquid slurry delivery pipe, and the mixing and stirring pump has an inlet port at a top, and the mixing and stirring pump has a discharge port on the same side as a discharge port of the double-liquid slurry delivery pipe, and a second slurry injection port is on the outlet port.

10 . The double-liquid grouting process according to claim 9 , wherein the slurry I inlet and the scouring liquid inlet are positioned on both sides of the double-liquid slurry delivery pipe, and a distance between the slurry I inlet and the outlet of double-liquid slurry delivery pipe is closer than a distance between the scouring liquid inlet and the outlet of double-liquid slurry delivery pipe.

11 . The double-liquid grouting process according to claim 10 , wherein the slurry I delivery pipe, the slurry II delivery pipe, and the scouring liquid delivery pipe are all equipped with delivery pumps.

12 . The double-liquid grouting process according to claim 10 , wherein each of the synchronous grouting unit is distributed evenly around a circle, when grouting, the slurry I and the slurry II are added into the slurry I storage tank a

Assignees

• Ocean Univ China
• China Railway 14Th Bureau Group Corporation Ltd
• China Railway 14Th Bureau Group Shield Engineering Coporation Ltd

Inventors

• Sha Fei
• Chen Jian
• Zhang Zhe
• Chen Peng
• Zhang Jianyong
• Liu Tao
• Kong Hao
• Yang Shutong
• Li Yixiang
• Yang Gongbiao
• Meng Qingsheng
• Duan Qiguang
• Diao Yuhong
• Shu Jicheng
• Zhang Minglong
• Gu Shijiu
• Niu Hongying
• Xu Jingze
• Zuo Yuhang
• Xi Mingshuai

Classifications

• C04B24/2641

  Polyacrylates; Polymethacrylates · CPC title

• C04B2103/302

  Water reducers · CPC title

• E21D11/105 Primary

  Transport or application of concrete specially adapted for the lining of tunnels or galleries (in building E04F21/08, E04G21/02); Backfilling the space between main building element and the surrounding rock, e.g. with concrete · CPC title

• C04B24/383

  Cellulose or derivatives thereof · CPC title

• C04B24/2623

  Polyvinylalcohols; Polyvinylacetates · CPC title