Thermal effects on the electrical characteristics of Malan loess
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RESEARCH ARTICLE
Thermal effects on the electrical characteristics of Malan loess Qiang Sun 1,2 & Fei Zhao 3 & Shaofei Wang 2 & He Zhang 2 Received: 30 July 2020 / Accepted: 4 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keywords Thermal effects . Malan loess . Electrical characteristics
Introduction Loess refers to the yellow silt sediments transported by wind during the quaternary period of geological age. Loess has many properties, such as porous, vertical joint development, and no bedding, and these properties are the main reasons for the collapsibility of loess. Because of the wide distribution and special engineering geological properties of loess, loess is used in many engineering construction fields, such as foundation engineering, subgrade Responsible Editor: Philippe Garrigues * Fei Zhao [email protected] 1
Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
2
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, People’s Republic of China
3
School of Civil Engineering, Tongji University, Shanghai 200092, People’s Republic of China
engineering, slope process, and chamber engineering (Sun 1988; Zhang and Wang 1995; Dezhina 2005; Wang et al. 2005; Liu et al. 2008; Xu et al. 2009a, b; Ping 2009; Zheng and Yang 2011; Shimin et al. 2011; Li and Su 2012; Stewart et al. 2012; Wang et al. 2012; Wu et al. 2015; Li et al. 2015; Shao et al. 2017; Li 2018
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