Background
Delhi Metro Rail Corporation has been entrusted with the task of providing an MRTS network to the city of Delhi and National Capital Region. The network is partly at grade, elevated and underground. At present, 190 km of metro network is operational out of which 48 km is underground. In Phase III also, 45 km of section is planned to be underground. The underground network comprises stations built by cut and cover method, while tunnels are constructed by Cut & Cover, NATM (New Austrian Tunnelling Method) or earth pressure balance or slurry type shield machine depending on the geological strata of the project. Selection of TBM depends on ground conditions, surface features and dimension of the tunnel. DMRC used 14 tunnel boring machines in Phase-II to construct the tunnel of finished diameter of 5.8 meter.
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