The shrinkage of borehole is calculated by Fast Lagrangian Analysis of Continua method (FLAC), which is applied to analyze borehole stability of plaster stone and salt stone in well drilling.

• 将拉格朗日元法应用于石油钻井所遇的盐膏地层，利用FLAC程序分析了盐膏地层的缩径变形。