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The DMRC Metro project at Gurudwara site, Rameshwar Nagar, New Delhi – a critical urban infrastructure development executed with precision to overcome challenging ground conditions and ensure safe, efficient connectivity for the city.
The brief
DMRC was excavating a shaft at Gurudwara site, Rameshwar Nagar, New Delhi, as part of the New Delhi Metro work. The TBMs are around 30m below ground. Silty clay with gravels, poorly graded sands, and silty clay make up the terrain. So far, the Shaft has been excavated to a depth of 25 metres below ground level.
The excavation has been hindered by excessive water infiltration due to the presence of the groundwater table at 6.30m below the ground surface. Under static water pressure, the loose and low-plastic silty sandy deposits flow into the excavation, causing ground settlement and erosion.
Field Conditions
- Presence of ground water level at shallow Depth
- Two TBMs that had been trapped due to hard rock in the ground area
- Limited availability of work space
Challenges
- Heavy water inflow
- Loose and soft soipresent at excavation zone
- High permeability value of soil
- Excessive loss of water from ground may lead to the catastrophe
Advanced engineering techniques such as controlled dewatering, soil stabilization, and precision excavation were employed to tackle challenging ground conditions. These measures ensured structural integrity and safety while maintaining the project’s design intent. This thoughtful integration of technology and planning not only mitigated risks but also delivered a robust foundation for seamless metro connectivity, ensuring long-term reliability and resilience.
