Through the numerical calculation for improved soil layers , there is an economical and reasonable improved zone whose depth is a constant but whose width is decided by the controlling residual deformation of subway structure . and a empirical formula for the subway residual deformation is given which can consider the improvement depth and width 通過對加固后的地基進行多次有效應力模擬,發(fā)現(xiàn)南京市地鐵地基合理的加固深度基本上保持不變,而合理的加固寬度則可由控制震后殘余變形來決定,并給出了計算加固后的地鐵隧道震后殘余位移經(jīng)驗公式。