为对加锚复合土钉支护体系的可靠度进行分析与论证,在分析可靠性原理的基础上,从土钉加固机理出发,假定滑移面为圆弧线,对复合支护体系的外部稳定性进行分析;假定滑移面为改进的双折线,对复合支护体系的内部稳定性进行分析;结合工程实例,通过二阶距法对内外部的极限状态功能函数进行可靠度分析。分析与实证结果表明:将可靠度指标用于预应力锚杆复合土钉支护体系的稳定性分析,可以考虑土体的变异性和不确定性,克服了传统的极限平衡理论的弊端;改进的双折线破裂面用于分析复合支护体系的内部稳定性,可考虑土钉支护上部受拉、下部受剪的受力特征,简单合理。研究结果可以为该类工程设计提供较好的理论基础与计算依据。 In order to analyze and prove the reliability of anchor-reinforced composite soil nailing system, based on the analysis of reliability principle, starting from the soil nailing mechanism, assuming that the slip surface is an arc line, the outer part of the composite support system The stability analysis is carried out. Assuming that the slip surface is an improved double-fold line, the internal stability of the composite support system is analyzed. The reliability analysis of the internal and external limit state function is carried out by the second-order distance method. The analysis and empirical results show that the reliability index can be used to analyze the stability of the prestressed anchor composite soil nailing system, which can take into account the variability and uncertainty of soil so as to overcome the disadvantages of the traditional limit equilibrium theory. The birefringence fracture surface is used to analyze the internal stability of the composite support system. It is simple and reasonable to consider the mechanical characteristics of upper and lower shear of soil nailing support. The research results can provide a good theoretical basis and calculation basis for such engineering design.