Abstract：Based on the comprehensive consideration of rock mass physical parameters and defects of conventional sensitivity analysis，grey relation analysis of parameters sensitivity of cavern stability based on 3D elastoplastic finite elements is put forward. Point safety factor is specified as examination index；and cohesion，angle of internal friction，elastic modulus，and Poisson¢s ratio are confirmed as sensitivity influential parameters. Taking Liangjiaren hydropower station on Jinsha River in China for example，the sensitivity analyses of many influential factors for point safety factor of excavated underground cavern typical sections have been conducted. Through the analyses，the influential effects for point safety factor of cavern stability are different when the influential factor has been changed. After excavation，the vault or sidewall of cavern is free and the constraint of cavity wall for inflection point is much larger，therefore，the safety factor of the inflection point is larger than that of vault or sidewall of cavern. Grey relation analysis shows that the scheduling of the influential degree of excavated underground cavern typical section on point safety factor is cohesion，angle of internal friction，elastic modulus，Poisson¢s ratio，therefore，the limitation of the conventional sensitivity analysis is overcome，and the sensitivity sequencing of the influential factors on key point safety factor are also unified，which verifies the mathematical and mechanical analytical results. Accordingly，clear direction for choice of support material of underground cavern stability is shown，and the requirements for cohesion and angle of internal friction must be paid more attentions.
聂卫平，徐卫亚，周先齐. 基于三维弹塑性有限元的洞室稳定性参数敏感性灰关联分析[J]. 岩石力学与工程学报, 2009, 28(S2): 3885-3893.
NIE Weiping，XU Weiya，ZHOU Xianqi. GREY RELATION ANALYSIS OF PARAMETER SENSITIVITY OF CAVERN STABILITY BASED ON 3D ELASTOPLASTIC FINITE ELEMENTS . , 2009, 28(S2): 3885-3893.
