Terms for subject Construction containing improvements

English	Japanese
ground improvement	地盤改良 (ぢばん・かいりょう)
ground improvement using sand compaction piles	柱状地盤改良 (ちゅうじょう・ぢばん・かいりょう)
surface ground improvement	表層地盤改良 (ひょうそう・ぢばん・かいりょう)