Unforeseen ground conditions & Solution found During Tunnelling works
Author(s):
Rupa Paramanik Banerjee, Prof Dr. Sandeep Potnis, Subrahmanya Gudge
Keywords:
Underground metro, Geology, TBM, ground improvement, Face mapping, Excavation, Surface settlement
Abstract
Carrying out Underground works such as tunneling and stations in difficult geology like Bangalore is challenging task. Designer has to adopt the innovative solution for station design due to limited space. The alignment of an underground metro project is constructed with twin tunnels by Tunnel Boring Machine (TBM) connecting two stations. Any underground excavation has a major influence on the nearby existing structures. Construction of tunnel using TBM needs proper planning in soil investigation, fixing alignment, selection of type of TBM, choosing of right drive sequence considering the logistic and feasibility aspects., deploying appropriate number of TBMs and execution of the work. As the investment over TBMs is huge, any major change effects during project execution leads to cost and time over-run. Also Utility shifting, traffic shifting impact in traffic movement, another challenge is to save the tree, save environment. In case heritage building at the surface, close monitoring is ensured. Bangalore Metro Rail Corporation Ltd (BMRCL) awarded work of underground construction between south ramp to Vellara consisting 3 underground stations and 5.4km of tunnel to M/s AFCONS Infrastructure Ltd. M/s AFCONS deployed 3 TBM’s, 2 slurry machines and one EPB machine. Several challenges, unusual hurdles were faced during execution of tunnelling work. This paper covers the challenges faced during tunneling in the ground filled with artificial materials like plastic sheets, animal bones, bottles and solutions found.
Article Details
Unique Paper ID: 166048

Publication Volume & Issue: Volume 11, Issue 2

Page(s): 21 - 31
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