Double-Liquid Grouting Slurry for High-Pressure Shield Tunneling
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Solution Overview
Problem
Current underwater shield tunnel back-fill grouting technologies, particularly double-liquid slurry, face challenges such as washout under high hydraulic pressure, low retention in muddy water, pipe plugging, poor filling effect, and inadequate strength and toughness, making them unsuitable for super large diameter underwater shield engineering under high water pressure conditions.
Innovation Solution
A double-liquid grouting slurry comprising silicate cement clinker, granulated blast furnace slag, fly ash, steel slag, bentonite, limestone tailing powder, water-reducing agent, cellulose, sodium silicate solution, short-cut fibers, and viscous polymers, optimized for high anti-scouring resistance, rapid hardening, and improved filling and anti-seepage performance, with a specific formulation and preparation process to ensure effective application in high-pressure dynamic water environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If double-liquid slurry is used for underwater shield tunnel back-fill grouting, then initial setting time is shortened and early strength is increased, but the slurry is easily washed away under high water pressure
Solution Approach 1:
The invention uses a composite slurry system consisting of cement-based slurry and water glass solution mixed in specific volume ratios (1:4 to 4:1). This composite formulation combines the rapid setting properties of water glass with the strength and durability of cement-based materials, achieving both short initial setting time (3-10 minutes) and high resistance to washout under high water pressure conditions
Solution Approach 2:
The invention optimizes the volume ratio parameter of cement-based slurry to water glass solution to control the balance between setting time and washout resistance. By adjusting this parameter within the range of 1:4 to 4:1, the slurry achieves rapid hardening while maintaining structural integrity under high hydraulic pressure, directly resolving the contradiction between fast setting and washout resistance
2Strength
If hardenable slurry containing cement is used, then strength is improved, but setting time is prolonged and washout resistance under high water pressure is reduced
Solution Approach 1:
The invention introduces water glass solution as an accelerating agent that fundamentally changes the setting time parameter of cement-based slurry. The chemical reaction between water glass and cement components accelerates hydration, reducing initial setting time to 3-10 minutes while maintaining 28-day compressive strength of 30-40 MPa, thus resolving the time-strength contradiction
3Loss of time
If inert slurry without cement is used, then setting time is reduced, but strength is insufficient and washout resistance is poor
Solution Approach 1:
The invention creates a composite system where water glass solution (providing rapid setting) is combined with cement-based slurry (providing strength). The water glass acts as both an accelerator and a binding component, creating a synergistic effect where the combination achieves both rapid setting (3-10 minutes) and high strength (30-40 MPa at 28 days), overcoming the limitations of inert slurry
4Strength
If traditional double-liquid slurry is used, then early strength is high, but anti-scouring resistance under high-pressure dynamic water is insufficient
Solution Approach 1:
The invention formulates a specialized composite slurry with cement, water glass solution, and supplementary materials in optimized proportions. This composite structure creates a dense, interlocked microstructure that provides both early strength development and exceptional resistance to high-pressure dynamic water scouring, with retention rates exceeding 95% under test conditions
Solution Approach 2:
The invention enhances specific local properties of the slurry by incorporating admixtures and optimizing the cement matrix structure. This creates localized regions of high density and strong bonding that specifically resist scouring forces, while maintaining overall rapid setting characteristics. The refined pore structure and interfacial transition zones provide targeted improvement in anti-scouring performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optimized double-liquid slurry demonstrates excellent resistance to high-pressure dynamic water, rapid filling in muddy water, high strength, cracking resistance, and strong anti-seepage, effectively preventing pipe blocking and maintaining soil stability, with a retention rate of at least 95% and 28-day compressive strength up to 36 MPa, suitable for super large diameter underwater shield engineering.
Implementation Method 1
Double-liquid slurry is composed of cement-based slurry and water glass solution, and its hardening time is controlled by the different volume ratios of cement-based slurry and water glass
Implementation Method 2
The optimized double-liquid slurry demonstrates excellent resistance to high-pressure dynamic water
Implementation Method 3
good anti-scouring rate under high-pressure dynamic water
Implementation Method 4
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
Data Source
AI summary
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.