非饱和紫色土的电阻率特性及参数间的相关性分析

为了探明电流频率、干密度、含水率、金属离子含量等因素对电阻率的影响规律及对电阻率的敏感性,以广泛分布于三峡库区的非饱和紫色土为研究对象,借助二电极法开展电阻率测试试验,并借助SPSS进一步分析电阻率与影响参数间的相关关系。结果表明:紫色土的交流电阻率随电流频率、含水率、干密度、锌含量的增大而降低,且降低速度逐渐减缓,最后趋于稳定。紫色土的电阻率及其影响因素的数列都符合正态分布,即显著性均大于0.05。电流频率、锌含量与电阻率之间呈显著或极显著相关。干密度、含水率和电阻率之间呈显著负相关。研究成果能反映出各因素对电阻率的影响程度,从而提高电阻率的测定精度。

Resistivity characteristics and correlation analysis among parameters of unsaturated purple soil

Resistivity is a basic parameter that can reflect the electrical conductivity of soil, such as the microstructure of the soil, water content, and heavy metal pollution. There are many factors affecting the determination of soil resistivity, such as current frequency, dry density, water content, and metal ion content. In order to determine the law of influence and sensibility of various factors on resistivity, a resistivity test was conducted based on the unsaturated purple soil widely distributed in the Three Gorges Reservoir area using the two-electrode method. In addition, the correlation between the resistivity and influencing parameters was further analyzed by SPSS. The results showed that the resistivity of purple soil decreased with the increase in the current frequency, dry density, and water and zinc content, and the speed gradually slowed, and finally tended to stable. The resistivity of purple soil and its influencing factors were in accordance with normal distribution, while the significance value was greater than 0.05. The negative correlations between the resistivity and current frequency and zinc content were significant or extremely significant. In addition, the correlations between the resistivity and dry density and water content were extremely significant. The present study reflected the influence of various factors on the resistivity in order to improve the accuracy of resistivity measurements.