As a static method for testing pollution and strength of soil, the resistivity method has been used by many scholars, whereas few studies have been carried out on dynamic deformation monitoring by this method. To study the pressure sensitive properties of copper contaminated soils solidified by modified red mud, a series of unconfined compression tests were conducted. The compressive stress, strain and electrical resistivity in whole process were determined. Relationship between the resistivity and the parameters including stress, strain, red mud content, copper content, and curing age were analysed. Then the mechanism of electrical resistivity is revealed. Results indicate the stress-resistivity change rate follows the same trend as the stress-strain curve. The resistivity change rate follows the same rule as the strain change, indicating that the electrical resistivity can reflect the strain indirectly. The higher red mud content is, the better pressure sensitive properties of solidified soil is. A proper amount of copper can improve the pressure sensitivity of solidified soil, while excessive copper ions can reduce pressure sensitivity of solidified soil. These changes can be attributed to the pore water, iron oxide in red mud, tunnel conductive effect and conductivity percolation.

中文翻译：

---

改性赤泥固化铜污染土壤压敏特性试验研究

电阻率法作为一种检测土壤污染和强度的静态方法，已被许多学者采用，而利用该方法进行动态变形监测的研究较少。为了研究改性赤泥固化的铜污染土壤的压敏特性，进行了一系列无侧限压缩试验。测定了整个过程的压应力、应变和电阻率。分析了电阻率与应力、应变、赤泥含量、铜含量和养护龄期等参数之间的关系。然后揭示电阻率的机制。结果表明应力-电阻率变化率遵循与应力-应变曲线相同的趋势。电阻率变化率与应变变化遵循相同的规律，表明电阻率可以间接反映应变。赤泥含量越高，固化土的压敏性越好。适量的铜可以提高固化土的压敏性，而过量的铜离子会降低固化土的压敏性。这些变化可归因于孔隙水、赤泥中的氧化铁、隧道传导效应和传导率渗透。