小半径曲线盾构法隧道钢管片囊袋工艺研究与应用

Research and Application of Steel Pipe Segment Bagging Technology for Small-Radius Curved Shield Tunnel

摘要:

小半径曲线隧道在大城市中得到广泛的应用，但小半径曲线隧道转弯时形成的法向分力对隧道造成极大的安全隐患。提出一种新型钢管片囊袋，在管片脱出盾尾后，通过钢管片囊袋定向注浆，并快速固化，填充盾尾间隙，为盾构隧道掘进提供反力，提高隧道成型质量和安全性。首先通过试验完成钢管片囊袋材质和保护钢板选型，然后通过功能试验和足尺试验对设计钢管片囊袋使用性能进行验证。结果表明，通过囊袋结构、材料、保护钢板等的设计和优化，可以满足小半径曲线隧道施工中转弯功能需求。

Abstract:

Small-radius curved tunnels are widely used in large cities. The normal force generated when a small-radius curved tunnel turns poses significant safety risks to the tunnel. A new type of steel pipe segment bag, after the segments are removed from the tail of the shield, is used for directional grouting, and quickly solidifies to fill the gap at the tail of the shield, which provides the reaction force for the tunneling of shield tunnels and improves the quality and safety of tunnel formation. Firstly, the selection of the steel pipe segment bag material and the protective steel plate is completed through experiments, and then the application performance of the designed steel pipe segment bag is verified through the functional tests and full-scale tests. The results show that the design and optimization of the bag structure, materials and protective steel plate can meet the turning functionality requirements for the construction of small-radius curved tunnel.