深井型直流接地极固井混凝土电阻率变化规律

发布时间：2018-03-06 05:07

本文选题：深井接地极　切入点：固井混凝土　出处：《南方电网技术》2017年09期 　论文类型：期刊论文

【摘要】：深井型直流接地极(简称深井接地极)被持续施加恒定直流时,固井混凝土作为电解质会与井壁钢套管发生腐蚀电化学反应,造成混凝土电阻率的改变。为研究不同状态的混凝土在直流作用下电阻率随着通电时间的变化规律,本文按实际深井接地极工程用混凝土配比配制试样,对固结3~7 d及完全固结后的干燥、浸渍混凝土试块进行了直流实验。综合实验结果表明:固结初期混凝土电阻率变化规律符合Archie公式;固结期内、完全固结后又被水浸渍的混凝土随通电时间的增加电阻率升高;完全固结并干燥的混凝土电阻率随通电时间的增加电阻率降低。分析认为直流极化作用是导致二者趋势差异的主要原因。
[Abstract]:When the deep well type DC earth electrode (referred to as the deep well earth pole) is continuously applied to a constant DC, the cementing concrete as an electrolyte will react with the steel casing of the shaft wall corrosion electrochemical reaction. In order to study the change of resistivity of concrete under DC action with the time of electrification, the concrete sample is prepared according to the ratio of concrete used in the actual deep well ground pole engineering, in order to study the change of resistivity of concrete in different states under direct current action. Direct current experiments were carried out on the dry and impregnated concrete blocks after 3 days of consolidation and after complete consolidation. The comprehensive experimental results show that the variation of the resistivity of concrete in the initial stage of consolidation accords with the Archie formula, and during the consolidation period, the variation of the resistivity of the concrete is in accordance with the Archie formula. The resistivity of concrete impregnated with water after complete consolidation increases with the increase of electrical time. The resistivity of fully consolidated and dried concrete decreases with the increase of electrification time. It is considered that DC polarization is the main cause of the difference between the two trends.
【作者单位】：直流输电技术国家重点实验室(南方电网科学研究院);武汉大学电气工程学院;
【基金】：南方电网重大专项项目(WY-KJXM-20150901)~~
【分类号】：TM862

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