目的 建立低保守性双腐蚀缺陷管道剩余强度的计算方法。方法 利用非线性有限元分析的数值仿真方法，对含有双腐蚀缺陷管道剩余强度进行分析，并验证了分析方法的可靠性。计算了轴向间距对带有相同腐蚀缺陷深度、长度，不同腐蚀缺陷深度、长度，以及具有不同环向间距或不同轴向间距的交叉位置双腐蚀缺陷管道失效压力的影响，首次提出了双腐蚀缺陷相互作用系数的概念，并将其应用到双腐蚀缺陷管道失效压力的计算中。结果 当轴向间距超过一定数值时，双腐蚀缺陷因相互作用而消失，只有在轴向间距非常小或两轴向腐蚀接触时，双腐蚀缺陷才有可能达到或接近完全相互作用。在相互作用范围内，双腐蚀缺陷的相互作用随轴向间距呈对数关系变化。当双腐蚀轴向投影完全重合时，腐蚀环向间距对双腐蚀缺陷相互作用的影响不大；当双腐蚀轴向投影未完全重合时，环向间距对双腐蚀缺陷相互作用的影响不可忽略。当双腐蚀缺陷之间存在一定环向间距时，双腐蚀缺陷的相互作用随轴向间距先增大后减小。结论 提出的相互作用系数概念能够解决交互影响双腐蚀缺陷管道失效压力的计算问题。

Objective To establish a method for the calculation of the residual strength of the pipeline with low conservation and double corrosion defects. Methods The residual strength of the pipeline with double corrosion defects was analyzed by nonlinear finite element analysis method. The reliability of the method was verified by experiments. The influence of the axial distance on the failure pressure of double corrosion defects in the pipeline with the same corrosion depth and length and the different corrosion depth and length at the cross position with different ring spacing or axial distance were calculated. The concept of the interaction coefficient of double corrosion defects was proposed for the first time, and it was applied to the calculation of the failure pressure of the double corrosion defects. Results The results showed that when the axial spacing exceeded a certain value, the interaction of double corrosion defects disappeared. Double corrosion defects were likely to reach or close to the full interaction only when the axial distance was very small or the two axial corrosion contacted. In the range of interaction, the interaction of double corrosion defects changed with the axial distance. When the axial projection of double corrosion was completely coincident, the corrosion ring spacing had little effect on the two corrosion defects. When the axial projection of double corrosion was not completely coincident, the effect of the ring spacing on the double corrosion defects was not negligible. When there was a certain ring spacing between two corrosion defects, the interaction of two corrosion defects increased first with the axial distance and then decreased. Conclusion The proposed concept of the interaction coefficient can solve the calculation of the failure pressure of the pipeline with double corrosion defects.