直控式泥水盾构 江底浅埋段施工技术

南宁地铁 3 号线青市区间越江隧道工程，盾构机在泥岩地层施工中存在刀盘结饼、渣土滞排等技术难题， 不仅降低盾构施工效率，更因渣土滞排导致江底段施工时易出现隧顶覆土击穿、盾尾密封失效等施工风险。通 过施工前对盾构机选型，针对泥岩地层段施工技术难题，对盾构机进行针对性设计、改造，在施工中控制及优 化掘进参数等，已有效缓解泥水盾构泥岩地层施工中刀盘结饼、渣土滞排等技术难题，提高泥水盾构泥岩地层 的施工效率，降低江底段泥水盾构的施工风险，对类似工程特别是泥水盾构江底浅埋段泥岩地层施工具有一定 的参考价值。

Analysis of Construction Technology of Direct-controlled Slurry Shield for Shallow Buried Section of River Bottom

This article analyzes both Nanning Metro Line 3 and the Crossing River Tunnel project in Qingdao in terms of technical problems such as knife intertwining cake and residue lag in the construction of mudstone stratum. These problems not only reduce the efficiency of shield construction, but also cause construction risks such as tunnel roof penetration and sealing failure of the shield tail. Through the selection of the shield machine and construction technology for the mudstone stratum to address the technical problems of the shield machine for the targeted design, measures such as transformation, control, and optimization of tunneling parameters effectively alleviate technical problems such as intertwining cake and residue lag in the construction of mud shield mudstone stratum. Moreover, they improve the construction efficiency of the mud shield mudstone stratum, and reduce the risk of mud shield construction in the river bottom section. This has some reference value for similar engineering applications, especially for the construction of mudstone stratum in shallow buried sections of slurry shields.