OasisLMS

With the advancement of urban growth, the practice of subsurface tunnelling has become increasingly prevalent in a variety of infrastructural projects, specially, within the vicinity of high-rise buildings supported on piled raft foundations. As a result, ground movements caused by such tunneling works could alter the behavior of the piles leading to affecting the overall performance of such deep foundation system. In the present study, three-dimensional numerical analyses are carried out to investigate the response of an existing piled raft having a 2 × 2 pile configuration subjected to a tunnelling-induced ground movement. The numerical model is first validated against a published field data, then is used for further study. Different positions of the tunnels are considered to assess its effects on the mechanical responses of the piles such as pile movement, pile’ s lateral deflection, axial force, and bending moment. The results obtained from the numerical simulations indicate that the pile behavior changes significantly due to tunnelling process at different positions around the existing piled raft foundation. Even the front and rear piles in a piled raft are found to respond differently when subjected to such ground movements in clay.

Manik Anand, Tata Consulting Engineers Limited; Prasun Halder, Indian Institute of Technology Jammu

International Conference Proceedings