What is a Slurry Shield Tunnel Boring Machine (TBM)? A Slurry Shield TBM is an engineering machine specifically designed for tunneling in groundwater-rich and softer geological conditions. This type of TBM is primarily used in mudstone, silty soils, or similar structures. Its key feature is utilizing a slurry circulation system to maintain pressure balance in front of the cutting face, preventing groundwater intrusion and collapses of surrounding strata.

　　I. Working Principle

　　The Slurry Shield TBM balances the water and soil pressure at the face using slurry pressure to ensure stability. During tunneling, the cutterhead rotates to excavate the ground while slurry is pumped into the space between the cutting face and the cutterhead. The slurry supports the cutting face and carries excavated material to the surface for processing.

　　II. Main Components

　　1. Cutterhead: Designed to cut through soil and rock, tailored to specific geological conditions.

　　2. Slurry Tank: Stores the slurry and regulates its pressure to balance the face's water and soil pressure.

　　3. Slurry Discharge System: Transports slurry containing excavated materials to the surface.

　　4. Propulsion System: Provides the power to move the TBM forward.

　　5. Guidance System: Ensures the TBM follows the intended path during excavation.

　　III. Features and Advantages

　　1. Wide Applicability: Adapts to various geological conditions, excelling in soft soils and gravel.

　　2. High Efficiency: Allows continuous tunneling, significantly reducing construction time.

　　3. Minimal Environmental Impact: Controls surface settlement effectively, reducing effects on nearby structures and utilities.

　　4. High Safety: Operators work within the shield, minimizing direct exposure to excavation hazards.

　　IV. Application Fields

　　Slurry Shield TBMs are widely used in urban subways, railway tunnels, and water resource projects. For instance, in city subway construction, these TBMs safely and efficiently excavate tunnels in complex underground environments, significantly contributing to urban transport development.

　　The Slurry Shield TBM, with its unique and precise operation, is an ideal choice for tunneling in soft, water-rich strata, greatly enhancing construction safety and efficiency.