三维地形下并行管道阴保干扰规律数值模拟研究

Numerical Simulation of Parallel Pipeline Interference Law inThree-dimensional Terrain

目的研究三维地形下的并行管道干扰规律,提出降低并行管道干扰的合理措施。方法使用BEASY软件进行数值模拟,通过设置不同的涂层破损率、管道直径、土壤电阻率、输出电流等探究各参数对三维地形下并行管道干扰的影响规律。结果并行管道间存在干扰,相较于单根管道,在辅助阳极附近的管道阴极保护电位变小,其他位置处管道保护电位略有上升。随管道并行间距增加,干扰减弱。土壤电阻率越大,阳极输出电流越大,辅助阳极距管道距离越近,管道直径越小,并行管道间干扰越剧烈。结论对于独立设置阴极保护的并行管道,推荐管道并行间距大于80m;对于联合阴极保护的并行管道,推荐管道并行间距小于7 m。

The paper aims to study the interference rules of parallel pipelines in three-dimensional terrain and provide reasonable measures to reduce parallel pipeline interference.BEASY software was used for numerical simulation in this paper,by setting different coating damage rates,pipe diameters,soil resistivity,output currents and other parameters,the effects of different parameters on the interference of parallel pipelines in 3D terrain were explored.Mutual interference indeed existed between the parallel pipelines.Compared with single pipelines,the protection potential of the pipeline near the auxiliary anode became negative,and the potential of the pipeline in the far distance became positive.As the parallel spacing of the pipes increased,the interference decreased.The larger the earth resistivity,the larger the anode output current,the closer the auxiliary anode to the pipeline,the smaller the pipe diameter,the more severe the interference between the parallel pipelines.For parallel pipelines under independent cathodic protection,the parallel spacing of the pipelines is recommended to be greater than 80m;for parallel pipelines under combined cathodic protection,the parallel spacing of the pipelines is recommended to be less than 7m.