为研究柔性立管压缩力学行为和保护层（加强带和外护套）受损对螺旋铠装层失效模式的影响，建立了非线性有限元模型。首先，分析了工程中常见破口形式，将其归类为四种较为规整的破口形式。通过未破口保护层的数值分析结果，说明螺旋铠装层受压的整体变形过程和变形特性。然后，通过对比保护层和螺旋铠装层的支反力时程曲线，进一步总结了受损保护层对螺旋铠装层失效不稳定性的影响。研究发现破口抵抗径向扩张能力与整体结构承压能力息息相关，同时破口形状对螺旋铠装层失效模式存在一定的诱导作用。外护套的波纹状失效模式或层内错动会瞬时强化螺旋铠装层，抑制其环向隆起失效。最后，定义了常见的螺旋铠装层的压缩失效模式，为海洋工程实践中的失效分析及应对策略提供有效的参考。

A nonlinear finite element model was established to study the compressive mechanical behavior of flexible pipes and the failure mode of reinforced armor layer with the damage protective layer. Firstly, the common damage shapes in engineering were analyzed and classified into four regular damage shapes. Then the undamaged numerical model was analyzed. The deformation process and characteristics of tensile armor layer were elaborated. The force history curves of each layer were compared, and the impact of damage protection layer on the instability of reinforced armor layer failure was summarized. The results showed that the ability to resist radial expansion due to damage is related to the structure's ability to withstand compression. The shape of the damage has an inducing effect on the failure mode of the reinforced armor layer. The ripple failure mode or internal dislocation of the out sheath will instantly strengthen the reinforced armor layer and suppress circumferential buckling. Finally, the common compression failure modes of reinforced armor layers were defined, providing effective references for failure analysis and response strategies in marine engineering.