Review Note

Last Update: 10/31/2024 01:04 AM

Current Deck: 6250 Questions

Published

Discuss the benefits of slurry TBMs in tunnelling through loose, water-saturated ground,nand how they handle high groundwater pressures. (5 marks)

Effective Ground and Face Stability

Benefit: The pressurized slurry system provides consistent face support, maintaining balance against both earth and groundwater pressures. This is essential for preventing ground collapse and reducing the risk of surface settlement.
Impact: In loose, granular soils, this stabilization prevents uncontrolled ground movement, protecting nearby structures and infrastructure, especially in urban or sensitive areas.

Handling High Groundwater Pressures

Benefit: Slurry TBMs manage high groundwater pressures by equalizing pressure at the tunnel face, preventing water from entering the excavation. The slurry acts as a barrier that controls groundwater inflow, keeping the excavation dry and stable.
Impact: This capability minimizes water-related risks, reduces the need for extensive dewatering, and allows tunnelling to proceed smoothly in areas with high groundwater levels.

Efficient Spoil Removal

Benefit: The slurry-soil mixture flows easily through pipelines to the separation plant, where spoil is filtered out. This closed-circuit system is efficient and minimizes the risk of clogging or spoil buildup at the tunnel face.
Impact: Continuous spoil removal helps maintain excavation rates and prevents interruptions, making slurry TBMs ideal for loose soils where efficient removal of wet, unstable material is necessary.

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Q42

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