Ground Improvement for Mumbai Coastal Road Project Package-1
The Mumbai Coastal Road Project Package 1 includes the construction of a 3.82 km long 8-lane road section over reclaimed land. To create green spaces, in the congested city, an area of approximately 75 hectares from the sea is reclaimed and protected from the sea by seawall. The challenge for reclamation in the Haji Ali Bay area is the presence of marine deposits of thickness varying from 1m to 6m on rock stratum. Shear strength requirements of marine deposits are not satisfied, and settlement issues will be observed during service. Hence ground improvement by stone columns was suggested with the design of stone columns being done to restrict total residual settlement at 100 years to 65mm.
Figure 1: Area of Haji Ali Bay showing presence of marine clay in low tide.
Parameters Affecting Design
Design Life: The design life of sea wall is 100 years. Further, the design life of rigid pavement and flexible pavements are considered as 30 years and 15 years respectively.
