随着中国油气管道的服役年限增加，管道受到外在因素影响不可避免地会产生的腐蚀、凹陷等缺陷，分析管道凹陷与腐蚀缺陷等对管道极限承载能力的影响势在必行。针对一段含凹陷及腐蚀缺陷的X80管道的安全性进行了模拟，通过改变凹陷长度、宽度、深度、材料类型等因素，分析了球型、椭球型等压头作用下的单凹陷区域对管道极限承载能力的影响。同时，研究了凹陷及腐蚀等复合缺陷同时存在时，凹陷及凹坑尺寸及间距等多种因素对管道安全性的影响，结果表明：凹陷长度及腐蚀长度和腐蚀深度是影响复合缺陷的极限承载能力的重要因素，凹陷作用在腐蚀中心点邻近区域时对管道的危害更大。

As the service life of China's oil and gas pipelines increase, the pipelines are inevitably subjected to defects such as corrosion and denting due to external factors. It becomes imperative that the impact of these defects, including denting and corrosion, on the ultimate bearing capacity of the pipelines be analyzed. A simulation was conducted on the safety of an X80 pipeline with dents and corrosion defects. By changing factors such as dent length, width, depth, and material type, the influence of a single dent area under the action of spherical and ellipsoidal pressure heads on the ultimate bearing capacity of the pipeline was analyzed. At the same time, the influence of various factors such as the size and spacing of dents and dents on pipeline safety was studied when composite defects such as dents and corrosion coexist. The results show that the length of dents, corrosion length, and corrosion depth are important factors affecting the ultimate bearing capacity of composite defects, and the damage to pipelines is greater when dents act in the vicinity of the corrosion center point.