Based on static relaxation fast Lagarangian analysis of continue(S-FLAC), a new method, generalized-interface-element method, is proposed to solve the problem of rock joints and interfaces.

• 根据静态松弛快速拉格朗日分析方法（S-FLAC），提出了一种求解岩体界面的新方法即广义界面单元方法。