Large NATM sections in urban environment – Experiences from Pune Metro

The Pune Metro Project is being undertaken by MahaMetro, as a Special Purpose Vehicle of Government of India and Government of Maharashtra. Pune Metro is aimed to tackle growing traffic congestion and chaos from the increasing population and fast urbanisation and provide comfortable and convenient commute in the city. Pune Metro Phase I will cover an aggregate length of 31.254 km. Corridor 1‐ Pimpri Chinchwad Municipal Corporation (PCMC) to Swargate has a length of 16.589 km with 5.09 km underground and 11.5 km elevated, comprising of 14 stations (9 Elevated and 5 Underground), wherein the underground reach is covering two packages, namely, UGC01 and UGC02. MahaMetro has awarded the design and construction works of both packages to Gulermak – TPL Pune Metro JV, with a joint venture of Tandon Consultants Pvt. Ltd. and Geoconsult India Pvt. Ltd. (TCPL‐GC JV) as detailed design consultants appointed by Gulermak – TPL Pune Metro JV. This article will deal mainly with package UGC02, where out of reasons of space constraints, two underground stations and the crossover were decided to be done by mined excavation, applying NATM (New Austrian Tunnelling Method). The excavation areas of the mined underground structures are between 187 and 303 m 2 .