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笔者所在城市属于砂卵地层,需要进行大型地铁基坑开挖工作。本文研究了车站基坑开挖和围护结构的参数。探讨了6步台阶整体后退挖土方式,对于围护结构采用了钢支撑与土钉墙挂网喷射混凝土联合应用的方式。修建之后,经过应用表明,该施工技术能够保证基坑边坡稳定,并能确保附近建筑结构的稳定和安全。
The author’s city belonged to sand and egg stratum and needed to excavate large-scale underground excavation. In this paper, the parameters of pit excavation and enveloping structures are studied. The 6-step step-back excavation method was discussed, and the way of joint application of steel support and soil-nailing wall net-sprayed concrete was adopted for the retaining structure. After the construction, the application shows that the construction technology can ensure the stability of foundation pit slope and ensure the stability and safety of the nearby building structure.