Performance of Jet-Grouted Partition Walls in Mitigating the Effects of Shield-Tunnel Construction on Adjacent Piled Structures

AbstractProtective interventions are often needed to protect sensitive buildings from ground deformation induced by tunneling. This paper evaluates the effectiveness of underground jet-grouted partition wall in mitigating the effects of shield-tunnel construction on existing piled structures by means of numerical analysis and field monitoring. It is shown that the tunneling-induced displacements field can be modified by the underground partition wall in different ways depending on the combination of influential factors, such as wall stiffness, partition range angle, and insert depth below the tunnel invert. The results also indicate that the presence of the partition wall can relieve the existing piles from suffering from differential displacement, thereby improving the mechanical performance of pile–pier interaction. The reasonable agreement found between the observed field measurements and the numerical results demonstrates that underground jet-grouted partition wall can serve as an effective recourse o...