本文利用圓弧與直線組合之複合破壞面計算剛性擋土牆背之主動推力係數，本文採用一與Terzaghi不同之自由體進行分析。結果顯示本文所得結果與其他方法所得結果相當，文末並列出水平地面垂直牆背的主動推力係數。 This article utilize a composite failure plane (circular arc + line) for computation of coefficients of active thrust. Results obtained in this article are comparable to other methods. The coefficients are taulated in this article for convenience.
