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在当今城市交通网络中,城市地铁占有着越来越大的比重。而作为地铁隧道施工的主要手段,盾构法的应用也越来越广泛。尤其是在城市的繁华地段,盾构法因其控地表沉降的优势,已基本成为唯一选择。对盾构机而言,刀盘的开挖直径大于管片外径,其在施工过程中所形成环体空隙需同步注浆及时填充,用以固结管片和控制地面沉降。但在具体实施过程中,往往因地层富水、浆液被稀释、注浆不饱满等多种原因,造成管片上浮、地表沉降超限等现象,严重者甚至引发地面塌方,造成人员伤亡事故。如何控制好同步注浆质量,预防风险事故的发生,一直是盾构法施工的重要课题。
In today’s urban transport network, the city subway occupies an ever-increasing proportion. As the main means of subway tunnel construction, the application of shield method is also more and more widely. Especially in the thriving parts of the city, the shield has basically become the only option because of its advantages in controlling surface subsidence. For the shield machine, the excavation diameter of the cutterhead is larger than the outer diameter of the pipe. During the construction, the gap formed by the ring body needs to be grouted in time and filled in time to consolidate the pipe and control the subsidence. However, during the concrete implementation process, often due to the formation of water-rich, the slurry is diluted, grouting is not full and other reasons, resulting in the pipe floating, surface subsidence and other phenomena exceeding the limit, and even lead to serious landslides, resulting in casualties. How to control the quality of synchronous grouting and prevent the occurrence of risk accidents has always been an important issue in the construction of shield tunneling.