土壤电阻率对罐底外侧阴极保护电位分布的影响

The Effect of Soil Resistivity on Cathodic Protection Potential Distribution Outside of Tank Bottom

建立了罐底外侧阴极保护电位分布的数学模型,模型中考虑了介质的不均匀性。利用数值模拟方法研究了罐底土壤电阻率沿垂直方向变化对电位分布的影响。结果表明:罐底沥青砂基础会加大电位分布的不均匀性;阳极埋深处的土壤电阻率对整个罐底的电位均有显著影响;在不同地质条件下进行深井阳极保护时,存在一个使电位分布效果最佳的阳极埋深点。

A mathematical model was established for the cathodic protection potential distribution outside of tank bottom, in which the inhomogeneity of medium was taken into account. The effect of soil resistivity change along vertical direction on potential distribution was studied through numerical simulation. The simulated results indicate that the non-uniformity is further intensified due to the bitumen sand base; soil resistivity in the position where auxiliary anodes are placed has significant effect on potential distribution; there is a buried depth of anode for optimal potential distribution under different geological conditions.