In tunnel surveying, the term 'breakthrough' refers to the:

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Science and Technology · Surveying

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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meeting of the headings driven from opposite sides

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Answer 1

completion of the tunnel lining

Answer 2

first excavation blast in soft soil

Answer 3

discovery of groundwater during drilling

Answer 4

meeting of the headings driven from opposite sides

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