Geological Research Institute for Coal Green Mining, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, People's Republic of China.
College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Mar;28(12):15160-15172. doi: 10.1007/s11356-020-11545-x. Epub 2020 Nov 23.
Malan loess is a common engineering geological material in Northwest China, which is often used in many engineering constructions. In this paper, the electrical properties of loess under high temperature environment are studied, which provides theoretical basis for engineering construction. The remolded loess samples are heated by different temperatures between 25 and 900 °C under laboratory conditions. Then, the surface features and electrical properties are measured and analyzed. The major findings are as follows: (1) The effect of high temperature on different electrical parameters of loess is different. As temperature increases, a series of physicochemical reactions occur in the loess; as a result, the resistance and impedance of loess samples initially increase and then decrease. The temperature of change trend changes between 500 and 600 °C, which fits the normal distribution. The capacitance of loess decreases first and then slowly increases with increased temperature. The temperature of change trend changes between 200 and 300 °C. (2) The experimental results also show that frequency has an important effect on the measurement of electrical parameters. As the frequency increases, the resistance, capacitance, and impedance decrease. In addition, at high frequencies, the electrical properties of loess are basically not affected by temperature. Therefore, using a frequency of 100 Hz is more advantageous to study the variation law of the electrical properties of loess.
马兰黄土是中国西北地区常见的工程地质材料，常用于许多工程建设中。本文研究了高温环境下马兰黄土的电性特征，为工程建设提供了理论依据。对重塑黄土样在实验室条件下进行了 25℃至 900℃的不同温度加热，然后对其表面特征和电性进行了测量和分析。主要发现如下：（1）高温对黄土不同电性参数的影响不同。随着温度的升高，黄土中会发生一系列物理化学变化，导致黄土样品的电阻和阻抗先增加后减小。这种变化趋势的温度变化在 500℃至 600℃之间，符合正态分布。黄土的电容随温度的升高先减小后缓慢增大，变化趋势的温度变化在 200℃至 300℃之间。（2）实验结果还表明，频率对电性参数的测量有重要影响。随着频率的增加，电阻、电容和阻抗减小。此外，在高频下，黄土的电性基本不受温度的影响。因此，使用 100Hz 的频率更有利于研究黄土电性特性的变化规律。
