软土地层中大断面矩形盾构关键施工技术研究

与圆形断面的盾构隧道相比,矩形盾构隧道在空间使用效率、潜覆土环境穿越方面存在明显优势,但断面形状和机械配置的差异使盾构掘进施工技术也有所变化。以国内首台土压平衡式矩形盾构机在上海虹桥商务区的工程实践为背景,依据现场环境监测、盾构姿态测量和管片形状监控,对矩形盾构隧道轴线控制、管片横竖内径控制和环境变形控制等关键施工技术开展探索和研究,经验和结论可用于指导类似工程实施。

Research on Key Construction Technology of Large Cross-section Rectangular Shield in Soft Ground

Taking a subway shield zone as example, the process of processing boulder when a shield traverses the weathered strata is described. The gird method is especially introduced to carry out the construction technologies of boulder detection and point-to-point boulder blasting implementation on the ground, which opens a green channel for the shield traverses the boulder group, reduces the risk of opening the cabin and changing the knife and ensures the smooth tunneling of the shield.