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In the Delhi Metro project, what was the main geotechnical challenge in Old Delhi?

A. Hard rock excavation

B. Sandy soils and groundwater table

C. Seismic fault crossings

D. High elevation variation

Answer: Option B

Solution (By Examveda Team)

Tunneling beneath Old Delhi involved dealing with loose alluvial soils and a high groundwater table, necessitating closed-face TBMs.

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