为了确定土壤电阻率分布方式对储罐底板阴极保护电位分布的影响,建立了储罐底板外侧阴极保护电位分布的数学模型,利用COMSOL软件计算在不同土壤电阻率分布方式下储罐底板外侧阴极保护电位的分布,研究了不同直径储罐在土壤电阻率分别为恒定、分层均匀、连续分布3种方式下阴极保护电位分布的计算误差.结果表明:采用土壤电阻率分层均匀分布方式下的计算误差最大为1.89％,恒定均匀分布方式下的计算误差最大为5.82％;储罐直径越大,数值计算的误差越小;通过COMSOL软件建立二次电流分布模型,其模拟计算结果与实际测试结果吻合良好,可以为阴极保护数值模拟中土壤电阻率的选取提供理论依据.
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