試し掘くつ坑こう

noun

test pit; pilot tunnel

Technical term in mining, civil engineering, and geology for a small excavation or borehole made to investigate ground conditions.

• トンネル工こう事じの前まえに、地ち質しつを調しらべるため試し掘くつ坑こうを掘ほった。

  Before tunnel construction, they dug a test pit to investigate the geology.

• 試し掘くつ坑こうの調ちょう査さ結けっ果かから、この場ば所しょは軟なん弱じゃく地じ盤ばんだと分わかった。

  From the test pit survey results, it was found that this location has soft ground.