noun
bedrock; foundation rock
Technical term used in geology and civil engineering for the solid rock underlying surface materials.
ダムの建設には、基礎岩盤の調査が不可欠です。
Investigation of the foundation rock is essential for dam construction.
この地域の基礎岩盤は花崗岩でできている。
The bedrock in this area is made of granite.
岩盤 is a general term for rock mass or bedrock, while 基礎岩盤 specifically refers to the rock that serves as a foundation for structures.
Compound of 基礎 (foundation) and 岩盤 (rock mass, bedrock).