There is a development trend from qualitative towards quantitative analysis for tunnel stability. The widely accepted convergence-confinement method (CCM) provides a quantitative framework for tunnel stability analysis, while the conventional CCM based on closed-form functions is essentially an ideal model without considering the tunnel section shape and rock weight in plastic zone. Herein, based on the CCM framework, a quantitative analysis procedure formulated through numerical simulations for more practical situations was systematically proposed to calculate the safety factor of spray-anchor support system in non-circular tunnel. Besides, similarities and differences between the most widely used Hoek-Brown (HB) and equivalent Mohr-Coulomb (EMC) criteria were considered for practical reference. The proposed method was utilized to conduct quantitative analysis of LDPs, mechanical responses of surrounding rock and safety factors for four typical tunnels, and the consistency between tunnels based on HB criterion (TBHBC) and EMC criterion (TBEMCC) was analyzed. The results indicated that the maximum radial convergence of LDP, plastic zone area, and safety factor of TBEMCC were 34.54%, 37.29%, and 47.71% lower than those of TBHBC respectively. The reasons for differences between results were revealed. The spatial effect induced by the face excavation of TBEMCC was weakened as compared to TBHBC, leading to a drop of LDP. Consequently, the safety factor was underestimated. The method systematically provided an effective tool for quantitative stability analysis and design optimization of support system for an underground excavation.

隧道稳定性分析呈现从定性向定量的发展趋势。广泛接受的收敛约束方法（CCM）为隧道稳定性分析提供了定量框架，而基于闭式函数的传统CCM本质上是一个理想模型，没有考虑隧道断面形状和塑性区岩石重量。本文基于CCM框架，系统地提出了一种通过数值模拟制定的针对更多实际情况的定量分析程序，用于计算非圆形隧道喷锚支护系统的安全系数。此外，还考虑了最广泛使用的 Hoek-Brown (HB) 和等效的 Mohr-Coulomb (EMC) 标准之间的异同，以供实际参考。利用该方法对4条典型隧道的LDP、围岩力学响应和安全系数进行了定量分析，并分析了基于HB准则（TBHBC）和EMC准则（TBEMCC）的隧道之间的一致性。结果表明，TBEMCC的LDP最大径向收敛度、塑性区面积和安全系数分别比TBHBC低34.54%、37.29%和47.71%。揭示了结果差异的原因。TBEMCC 工作面开挖引起的空间效应较 TBHBC 减弱，导致 LDP 下降。因此，安全系数被低估了。该方法系统地为地下开挖支护系统的定量稳定性分析和设计优化提供了有效的工具。