The Delhi Metro has been ranked second among 18 international metro
systems in terms of overall customer satisfaction in an online customer
survey. It is also the world’s 13th largest metro system in terms of
length and 12th largest in terms of the number of stations. The Delhi
Metro was planned to be built in phases spread over approximately 20
years, each phase with a target of five years and the end of a phase
marking the beginning of another.
Phase I
Location: Delhi, India
Client: Delhi Metro Rail Corporation
Contractor: Phase 1: MC1A: KSHI (Kumagai-Skanska-HCC-Itochu) JV, MC1B: IMCC (Dywidag-L&T, Samsung, Ircon-Shimizu) JV
Duration: 2002 till 2005
Phase-I
involved construction of an 11.1 km underground rail line. The contract
was awarded in two parts: MC1A (4.5 km long 4 stations) and MC1B (6.6
km long, 6 stations) corridors.
Encardio-rite was awarded the
contract for the complete monitoring work for both MC1A and MC1B i.e.
supply, installation, monitoring and data analysis with reporting for
geotechnical instruments. A large team of experienced engineers and
technicians were stationed at site for 3 years for the monitoring work.
The instruments used included:
- Inclinometer system for diaphragm walls and subsurface monitoring around stations and tunnels.
- Magnetic extensometer for subsurface settlement monitoring around stations.
- Piezometers (vibrating wire, casagrande and standpipe) for monitoring ground water level and pore pressures.
- Compression load cells for struts, compression load cell for pile testing, center hole load cell for anchors.
- Strain gages (spot weldable) for strut monitoring, strain gages (arc weldable) for pile testing and diaphragm walls.
- Borehole extensometer for subsurface settlement and ground settlement points for surface settlement monitoring.
- Crack meters, tilt meters and building settlement points for structure monitoring.
- Vibration monitoring.
- Automatic data acquisition system as well as portable readout units.
Phase II
Location: Delhi, India
Client: Delhi Metro Rail Corporation
Contractor: L&T, Senbo, ITD CEC-Soma, MTG
Based
on the successful execution of Phase I of Delhi Metro, Encardio-rite
was entrusted with the monitoring work for Phase II as well. The scope
of work included supply, installation, monitoring and data analysis with
reporting for geotechnical instruments. The team, for the buildings
within zone of influence, also executed the pre and post construction
building condition survey. Phase II comprised of an underground corridor
that ran about 36 km long with 20 underground stations. The instruments
used were the same as that of Phase I.
Phase III
Location: Delhi, India
Client: Delhi Metro Rail Corporation
Contractor: Pratibha, JK Infra, L&T, Valecha, Era, HCC
Once
again Encardio-rite was entrusted with the monitoring work for Delhi
Metro’s Phase III. The scope of work included supply, installation,
monitoring and data analysis with reporting for geotechnical instruments
and the pre/post construction building condition survey. Instruments
used were almost the same as those used in Phase I and II. Online
monitoring was executed successfully, wherein a web based data
management system provided the data in near real time for the
stakeholder.
