Mumbai Metro’s Line-5 and Line-6
Mumbai is located on Salsette Island, west coast of Maharashtra State, facing with Arabian Sea. Population in Mumbai city is about 14 million（statistics in 2009）, the most populous city in Mumbai and also one of the most populous cities in the world.
The implementation of 2 new elevated metro lines in Mumbai has been approved. This includes the 24 km Line-5 between Thane – Bhiwandi – Kalyan and the 14.5 km Line-6 between Lokhandwala – Jogeshwari – Vikhroli – Kanjurmarg.
Line 5 (shown in Pink below) has been estimated to cost Rs. 8,416 crore and will consist of 17 stations.
Line-6 (shown in Brown below) has been estimated to cost Rs. 6672 crore and will consist of 13 stations.
The population in Mumbai will probably reach to 30 million, but infrastructure of urban transportation is quite hysteretic. Influenced by geographical environment, road curves are many, radius of turning is small. So when prompt braking and starting, a series of new technologies need to be adopted to ensure metro’s reliability and comfort.
Soil nailing support in metro construction mainly reflects at security aspect. Through self reinforcement and combination with concrete spraying, similar gravity retaining wall will be formed to resist soil pressure behind it and then maintain stability of excavation face.
Soil nail can not only be applied in temporary supporting structure, but also in construction process of permanent projects.