TBM Launching Near Seashore: Ground Improvement by ITD Cementation

Dr. Tanumaya Mitra, Sudip Kumar Koley, Padma Tiruvengala, Naru Raju, and Prodyot Kumar Ray, at ITD Cementation India present the ground Improvement requirement for a TBM launching under Shallow Overburden close to a seashore.

Tunneling under shallow overburden is always a challenging aspect due to the possibility of blow out because of application of higher face pressure or segment uplift as there are always certain lengths of tunnel linings located in the unsolidified grout. As a result, the buoyancy induced by unsolidified grout and hydrostatic pressure may be higher than the lining gravity, which leads to the lining uplift tendency.