大直径泥水盾构下穿黄河堤坝施工技术研究

Research on Technology of Large-diameter Slurry Shield Tunnel Construction under the Yellow River Dyke

依托济南黄河隧道工程,本文对高水压粉土、粉砂层中大直径泥水平衡盾构下穿黄河堤坝施工中堤坝沉降变形规律和同步注浆、开挖面稳定、掘进速度、进出泥量、盾构姿态等关键施工参数进行了总结分析,并得到双线隧道下穿时表沉降最大值出现位置偏离各隧道中心轴线约0.2倍的隧道外径,盾构下穿堤坝时应减少姿态纠偏,稳定开挖面水土压力,平衡进出泥量,均匀快速通过。

Based on the Yellow River tunnel project in Jinan,this paper analyzes the law of dyke settlement and the key construction parameters,such as synchronous grouting,stability of excavation face,driving speed,amount of mud in and out,shield posture for the large-diameter slurry balance shield acrossing the Yellow River dyke in silt and silt layer with high water pressure.It is found that the maximum settlement occurs about 0.2 times of the outer diameter of the tunnel which deviates from the central axis of each tunnel when the double-line tunnel is crossing the Yellow River dyke.It should reduce the attitude correction,stabilize the water and soil pressure on the excavation face,balance the amount of mud in and out,and pass evenly and quickly.