Progress is steadily improving on the construction of cross passages. Tunnelling Solutions are now excavating the cross passages that have been previously stabilised although some small areas of wet sand remain.
The ground conditions have proven to be challenging and dangerous and require a team of experienced and skilled tunnelling personnel. This crew of specialised tunnelling experts are dealing well with the ever changing conditions.
With one Top Heading complete and another nearing half way, the challenges of encountering wet sand are being managed through localised grout injection into the affected pockets. This has allowed excavation to advance progressively without any major problems.
As always Safety is front of mind and particularly so under the relevant and populated areas which we are tunnelling through in Chennai.