Abstract Deep-well DC earthing electrode occupied much smaller area than the traditional one, which greatly reduce the difficulty of site selection. However, due to the extremely high current density at the end of linear earthing electrode, temperature rise has become an important factor restricting the development of deep-well earthing technology. In order to evaluate the heating situation of deep-well earthing electrode in an accurate way, this paper carried out the field temperature rise test of deep-well earthing electrode, and the error between the temperature rise result calculated by the wide-area soil resistivity model obtained by conventional measurement methods are analyzed. It was found that the local soil resistivity near the deep-well earthing electrode determines the temperature rise characteristic. Based on the fitting results of the apparent resistivity logging, a local soil resistivity modeling method suitable for deep-well earthing electrode temperature rise calculation is proposed, and the deep-well earthing electrode temperature rise calculation model considering temperature characteristics of water-saturated underground medium and local soil model is established. The calculation result of this model is used to compare with the field measured data of the temperature rise in actual projects, and the maximum temperature error is found to be 5.5 °C. The trend of electrode temperature rise is in good agreement with the test results, which explains the special phenomenon of high temperature rise in low resistance layer. Project cases prove the effectiveness and accuracy of the soil modeling and temperature rise simulation method proposed in this paper.

中文翻译：

---

高压直流深井接地极温升计算的土壤电阻率模型

摘要 深井直流接地极所占面积比传统接地极小得多，大大降低了选址难度。但由于线性接地极末端电流密度极高，温升成为制约深井接地技术发展的重要因素。为准确评价深井接地极受热情况，本文进行了深井接地极现场温升试验，通过广域土壤电阻率计算得到的温升结果与对通过常规测量方法获得的模型进行了分析。研究发现，深井接地极附近的局部土壤电阻率决定了温升特性。基于视电阻率测井拟合结果，提出了适合深井接地极温升计算的局部土壤电阻率建模方法，建立了考虑含水饱和地下介质温度特性的深井接地极温升计算模型并建立局部土壤模型。将该模型的计算结果与实际工程中温升的现场实测数据进行对比，发现最大温差为5.5℃。电极温升趋势与测试结果吻合较好，说明了低阻层温升偏高的特殊现象。