泥水盾构循环泥浆制备工艺技术——以甬台温天然气输气管道瓯江盾构工程为例

Slurry Shield Circulating Mud Preparation Technology -By Taking Oujiang Shield Project of Yontaiwen Gas Pipeline for Example

在泥水盾构施工中,泥浆作为输送渣土的介质,同时也是支护开挖面稳定的重要因素.因此,循环泥浆性能指标的好坏,决定了泥水盾构施工能否正常进行.瓯江盾构项目结合现场的实际情况和地层特点,针对大粒径卵石层掘进,主要从泥浆性能需求、配制设备改进、制备工艺优化等方面入手,不断摸索和创新.经施工技术人员的多次试验与实践,成功解决了大粒径卵石层掘进对泥浆质量和配制数量的要求,制定了掘进泥浆制备作业指导书,确保工程顺利穿越了300余米大粒径卵石层,日进尺达到7m.

During the construction of slurry shield, the mud as medium of conveying waste residue, was also a key factor to stabilize the excavation face. As a result, the stand or fall of circulating mud per-formance index decided if the slurry shield construction was normal. For Oujiang Shield Project, combined with its actual situation and the characteristics of formation, taking into consideration the large grain size pebble layer, from the aspects of improving the mud performance, slurry preparation equipment improvement, and optimizing the preparation technology, it has been continuously explored and innovated. Through many experiments and practice of construction and technical personnel, it successfully meets the requirements of mud quality and number of mud preparation for the large grain size pebble layer excavation; moreover instructions for slurry preparation are formulated to ensure smooth crossing through the project of 300 meters large grain size pebble layer, whose daily penetration reaches 7 meters.