Tunnel Boring Machine (TBM) is a huge investment but is being adopted for enabling safe and speedy construction of tunnels. However, when unforeseen and unfavourable conditions are encountered, it is important to mitigate the issues immediately with quick and meticulous planning since, tunnelling below residential buildings involves high risks and challenges.
For the construction of JPW to Krishna Park Downline Tunnel of Package DC-06, a 5.8 m internal diameter tunnel was excavated in sandy silt and silty clay strata. Since the tunnelling was done in soil strata having low plasticity and the water table being up to crown, the earth pressure balancing method was adopted to eradicate the issue of over excavation, sink holes, and heaving.
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