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Slurry Shield Tunneling Project: Sydney Cross-River Tunnel Construction

Slurry Shield Tunneling Project: Sydney Cross-River Tunnel Construction

2025-12-08

Slurry Shield Tunneling Project: Sydney Cross-River Tunnel Construction

latest company case about [#aname#]

During the construction of the Sydney cross-river tunnel, the slurry shield tunneling generated a large amount of waste concrete slurry characterized by high water content and ultra-high clay particle content. This kind of slurry had long been a tough problem for construction teams due to the difficulty in solid-liquid separation and low treatment efficiency. To solve this problem, researchers carried out flocculation and dehydration tests on the slurry using APAM in combination with polyaluminum chloride (PAC) and polyaluminum ferric chloride (PAFC).
The test results showed that APAM outperformed PAFC and PAC alone in terms of slurry dehydration effect, and the composite flocculant of PAFC + APAM achieved the optimal conditioning effect on the waste slurry. When the optimal dosage of PAFC solution was 33g/L and that of APAM solution was 233g/L (with the dry matter dosages being 1.6g/L and 0.466g/L respectively), the slurry dehydration rate reached 29.6% within 90 minutes, and the turbidity of the separated free water was reduced to 62.0 NTU. The adsorption and bridging effect of APAM's long polymer chains was the core driving force behind the efficient dehydration. This application not only ensured the smooth progress of the tunnel construction but also provided reusable clear water, which reduced the project's demand for fresh water resources.

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Slurry Shield Tunneling Project: Sydney Cross-River Tunnel Construction

Slurry Shield Tunneling Project: Sydney Cross-River Tunnel Construction

Slurry Shield Tunneling Project: Sydney Cross-River Tunnel Construction

latest company case about [#aname#]

During the construction of the Sydney cross-river tunnel, the slurry shield tunneling generated a large amount of waste concrete slurry characterized by high water content and ultra-high clay particle content. This kind of slurry had long been a tough problem for construction teams due to the difficulty in solid-liquid separation and low treatment efficiency. To solve this problem, researchers carried out flocculation and dehydration tests on the slurry using APAM in combination with polyaluminum chloride (PAC) and polyaluminum ferric chloride (PAFC).
The test results showed that APAM outperformed PAFC and PAC alone in terms of slurry dehydration effect, and the composite flocculant of PAFC + APAM achieved the optimal conditioning effect on the waste slurry. When the optimal dosage of PAFC solution was 33g/L and that of APAM solution was 233g/L (with the dry matter dosages being 1.6g/L and 0.466g/L respectively), the slurry dehydration rate reached 29.6% within 90 minutes, and the turbidity of the separated free water was reduced to 62.0 NTU. The adsorption and bridging effect of APAM's long polymer chains was the core driving force behind the efficient dehydration. This application not only ensured the smooth progress of the tunnel construction but also provided reusable clear water, which reduced the project's demand for fresh water resources.