Replacement method - Okikaekouhou

... The following are some of the traditional methods of soil improvement: (1) compaction, which compacts loose ground with rollers or tamping tools; (2) water compaction, which compacts loose sand by pouring water on it; (3) physical soil improvement, which adds gravel and other materials to soft clayey soil to improve its quality; (4) drainage, which improves drainage for soil that is too wet and weak; (5) replacement, which replaces the soil with better quality soil; (6) chemical soil stabilization, which chemically improves the ground by adding lime and other materials; (7) surface treatment, which involves bundling trees and other materials into a grid pattern and laying them on the ground surface, and then building up soil on top of the grid; and (8) pile driving, which involves driving piles into loose sandy ground to compact it or driving piles into soft clayey ground to create a supportive framework in the ground. In recent years, when new land uses are planned in Japan, it is often the case that the purpose cannot be achieved without improving the ground on the remaining land.

*Some of the terminology used in reference to the "replacement method" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　古くから行われてきた地盤改良の方法を列挙してみると次のようになる。(1)緩い地盤をローラーやたこ(土を突き固める道具)などで締め固める締固め工法，(2)緩い砂地盤に水をかけて締め固める水締め工法，(3)軟弱な粘性土地盤に砂れきなどを入れて土質の改良を図る物理的土質改良工法，(4)水分が多くて軟弱な状態の地盤に対して，水はけをよくする排水工法，(5)良質の土に入れかえる置換え工法，(6)石灰などを加えて地盤を化学的に改良する化学的土質安定工法，(7)雑木などを格子状に結束して地表面に敷いた上に盛土などをする表面処理工法，(8)杭を打って緩い砂地盤を締め固めたり，粘性土軟弱地盤に杭打ちをして支持力のある骨組みを地盤中に作る杭打ち工法。　近年，日本で新しい土地の利用を計画するときに，残されている土地は地盤を改良しないと目的を達しえないことが多い。…

※「置換え工法」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報