Abstract: With FLAC3D software as platforms，secondary development was carried out on the basis of the convergence criteria by the built-in FISH language，and stability coefficients of landslide were identified according to the unbalance-reduction coefficient． FLAC3D strength reduction method was applied to the analysis on the stability coefficients of landslide in different c，φ value． And the sensitivity of c，φ value on the stability coefficients of landslide was also analyzed． Compared with the limit equilibrium method，both methods indicate that φ value was more sensitive on the landslide stability coefficients than c value． Through the comparative analysis on the shear strength reduction method and the limit equilibrium method，the comprehensive value was used as anti-shearing strength parameter，which was used for the supporting structure design of the landslide． The calculation results indicate that the shear strain of landslide mainly focuses on the middle part or the lower part，and the landslide is shear failure．

Key words: landslide, inversion, FLAC3D, anti-shearing strength parameters

摘要： 以FLAC3D 软件为平台，基于收敛准则利用内嵌FISH 语言二次开发，依据不平衡力-折减系数判定滑坡的稳 定系数。应用FLAC3D 强度折减法分析滑坡在不同的c，φ 值的稳定系数，并分析c，φ 值对滑坡稳定系数的敏感性， 与极限平衡法对比，二者分析均认为φ 值较c 值对滑坡稳定性更为敏感。通过对强度折减法和极限平衡法的比较 分析，综合取值作为滑坡的抗剪强度参数，用于滑坡的支护结构设计。计算结果表明: 滑坡的剪应变主要集中于中 下部，滑坡呈剪切破坏。

关键词: 滑坡, 反演法, FLAC3D, 抗剪强度参数