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Beyond Engineering

Permanent Sprayed Concrete Linings on Mumbai Metro Line 3 Sahar Road crossover cavern

The Sahar Road Crossover Cavern is a stepped profile cavern on the Mumbai Metro Line 3 project, and comprises 6no. 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 development of a ‘drained regulating layer’ concept which allowed the application of sprayed waterproofing membranes in wet conditions; this was a first for any metro project in India, with the latter considered an international first.