SAFETY EVALUATION OF ADJOINING STRUCTURES IN URBAN AREAS DURING DEEP EXCAVATION: A CASE STUDY OF NAGPUR METRO-PPT Presentation

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The study evaluates how deep excavation for the Nagpur Metro station at Kasturchand Park affected nearby structures, focusing on the MSEDCL building. Deep excavations in congested urban areas can alter ground stresses and cause settlement or damage, making effective support systems essential.<br /><br />The researchers used the finite-element software MIDAS GTS-NX to model excavation in layered soil and compare conditions with and without support. Maha-Metro installed 1,200 mm-diameter secant piles, spaced 1,000 mm apart and extending 13 m deep, around the commercial building’s perimeter before construction.<br /><br />The analysis estimated that excavation-related settlement of the adjacent MSEDCL building would be 165 mm without support, compared with 28 mm with secant piling—an 83% reduction. The building and surrounding pavement have remained stable, with no observed settlement or distress.<br /><br />The study concludes that selecting a suitable support system can substantially reduce excavation-related movement and protect neighboring structures. Secant piling proved an effective precaution in this case, highlighting the value of assessing local soil conditions, excavation depth, groundwater, and adjacent-building sensitivity when designing urban excavations.

Keywords

deep excavation

Nagpur Metro

Kasturchand Park

MSEDCL building

secant piles

finite element analysis

MIDAS GTS-NX

settlement reduction

urban excavation support

ground movement