Study on the Intensive-Efficient Separation Method and Recycling Utilization Technology of Waste Shield Slurry
摘要
When a slurry shield tunnel traverses through extensive formations of ultra-fine granular soft clay layer, issues such as rapid deterioration of slurry indicators and low levels of integration in slurry treatment equipment are often encountered. Failure to promptly treat this waste slurry could have severe impacts on the project schedule and the surrounding environment. In order to realize the efficient separation and recycling of shield slurry, this paper introduces an intensive-efficient separation and recycling technology for waste shield tunneling slurry. The results indicate: (1) the wet stepwise separation and recycling technology of slurry is invented, enabling rapid separation of large mud clumps. (2) A rapid screening dehydration and multi-stage cyclone treatment method for ultra-fine granular is proposed, achieving effective separation of particles below 20 µm. (3) A combined waste slurry treatment process utilizing three-stage cyclone separation and pressure filtration is raised, enabling the recycling of reconstituted slurry particles and pressure-filtered water. (4) An integrated treatment system for shield tunneling slurry is established, which reduces land occupation and energy consumption while achieving a maximum treatment capacity of 3000 m3/h for the waste slurry. Finally, relying on the Hengqin Mangzhou Tunnel project, the practice results show that the slurry separation particle size is increased from 20 to 5 μm and the amount of waste slurry is reduced by 35%. The research findings and successful practice application of this paper provide a basis and guidance for the innovation of intensive-efficient separation and recycling technology of shield slurry.