Mumbai: In all 11 firms have bid for conducting geotechnical soil investigation for 18-km Mumbai Metro Line-11 (Green Line) which will connect .k Bus Depot and Shyamaprasad Mukherjee Chowk via 15 underground stations. The Line-11 to be constructed by the Mumbai Metro Rail Corporation Ltd (MMRC), was redesigned with a new alignment earlier this year. It will be Mumbai’s third underground line after Line-3 (Aqua Line) and Line-7A (Red Line).
MMRC had invited bids for this contract in the month of August with a 90-day deadline and the technical bids were opened on Friday last.
“No work has started yet for geotechnical investigation for Metro 11 as the agency is yet to be appointed. We have invited tenders and technical scrutiny is currently on. The Detailed Project Report (DPR) for Metro 11 is being finalised and we expect to submit the same with the state government for approval by the end of September, 2024,” a senior MMRCL official said.
Asked as to when the construction work is likely to start, the official said that the work will commence only after the state government approves the DPR and financial closure is attained.
According to reports, the geotechnical study aims to gather essential data on the sub-soil conditions of the site. This information will assist contractors in developing an appropriate detailed design for the structures and selecting suitable machinery, methods, and technologies for construction. The study will also help mitigate potential damage to existing structures during the construction process.
As per the terms and conditions of the tender, boreholes with a diameter of 150 mm will be drilled at regular intervals of 500 meters along the twin tunnel alignment. Additionally, three boreholes will be drilled at each station site. According to the basic consultant plan, the depth of these boreholes will range from 10 meters to over 20 meters.
The report of the geotechnical survey will incorporate elements such as borehole details and locations with georeferenced coordinates, geological characteristics of the area, water table levels, results of conducted tests, foundation recommendations based on borehole data, cut-off values, bearing capacities of the soil, seismicity of the soil etc.
Proposed stations along Metro 11:
.k Bus Depot
Wadala Depot
CGS Colony
Ganesh Nagar
BPT Hospital
Sewri, Hay Bunder
Coal Bunder (Darukhana)
Reay Road
Byculla
Nagpada Junction
Bhendi Bazaar
Crawford Market
CSMT Metro (interchange with Aqua Line)
Horniman Circle
SPM Circle.
