The purpose of this study is to investigate the stability of deep rectangular tunnels excavated in a jointed rock mass using adaptive finite element limit analysis (AFELA) method. The rock mass is assumed to obey the generalized Hoek–Brown failure criterion. The numerical results from parametric studies are presented in the form of dimensionless tables and figures concerning stability numbers (N_s). Typical failure mechanisms are depicted and discussed based on visualized results from AFELA. The results demonstrate that N_s decreases with geological strength index (GSI), increases with disturbance factor (D), stays nearly unchanged with the intact rock yield parameter (m_i) and is less sensitive to GSI as D decreases. Besides, an analytical upper bound limit analysis method is also applied to provide a check on the validity of the results from AFELA. The influence of the excavation-induced disturbance on the stability of deep rectangle tunnels is investigated by introducing a disturbance coefficient (ζ).

这项研究的目的是使用自适应有限元极限分析（AFELA）方法研究节理岩体中开挖的深矩形隧道的稳定性。假定岩体服从广义的Hoek-Brown破坏准则。参数研究的数值结果以无量纲表和有关稳定性数（N _s）的形式表示。基于AFELA的可视化结果描述和讨论了典型的故障机制。结果表明，N _s随地质强度指数（GSI）减小，随扰动因子（D）增大，在完整的岩石屈服参数（m _i），并且随着D的降低对GSI的敏感性降低。此外，还应用分析上限分析方法检查AFELA结果的有效性。通过引入扰动系数（ζ），研究了开挖扰动对深矩形隧道稳定性的影响。