Control of Ground Subsidence Using Foot Reinforcement Piles During Shallow NATM Tunnel Excavation on Unconsolidated Ground

通过简化模型试验和数值分析，研究了足部加固桩对浅埋暗挖法隧道开挖中防止地面和隧道沉降的作用。具体讨论了桩的长度、安装位置、安装角度等因素对桩身稳定性的影响。此外，还讨论了预处理法与足部加筋桩在实际工程中的应用效果。

A simplified model experiment and numerical analyses have been carried out to investigate the effect of the foot reinforcement pile on preventing settlements of ground and tunnel, that occurring in shallow NATM tunnel excavation. Specifically, the influence of the length, installation position and the installation angle of the piles were discussed in this study. Moreover, the effect of pre-ground improvement method, which used together with foot reinforcement pile in the actually field, has also been discussed.