Examveda

In the Olmos irrigation tunnel project (Peru), what geological hazard caused cost overruns?

A. Collapsing sand layers

B. Earthquakes

C. Rock bursting in andesite

D. Glacier melting

Answer: Option C

Solution (By Examveda Team)

The tunnel experienced rock bursting due to high in-situ stress in andesite formations, damaging TBMs and delaying excavation.

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