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BTSYM Evening Lecture: Mumbai Metro, Sahar Road Crossover

Event organised by The British Tunnelling Society

09 June 2022

This event has now ended

You can catch-up on details or any broadcast and downloads here.


The Sahar Road Crossover Cavern (SRCC) is a stepped profile cavern on the Mumbai Metro Line 3 project and comprises 6 different cross-sections, symmetrical about the middle of the cavern.

The original design called for a conventionally reinforced, cast-in-situ secondary lining, though given the number of geometrical sections and complexity of staging the works. Mumbai Metro Rail Corporation opted to explore the use of sprayed waterproofing membranes and permanent fibre reinforced sprayed concrete linings (PSCL) as well as the development of a ‘drained regulating layer’ concept which allowed the application of sprayed waterproofing membranes in wet conditions; this is a first for any metro project in India. The successful implementation of water management and PSCL linings on the SRCC is envisaged to be a revolutionary step forward for the tunnelling industry in India.

Thomas Macgowan will present on the site experience of delivering the temporary water management, fireproofing design and gaining design approval for permanent SCL.

Robin Swift will present the procurement of sprayed membrane and SCL site trails, managing material approvals and overcoming the logistical challenges faced.

The presentation will also focus on the personal experience and lessons learned from working in India.

For more information please contact:

Elena Arrobbio