Effect of water content and sodium sulfate concentration on the resistivity of red clay

IF 0.5 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
Yuan Xin, Qiang Sun, Tuo Lu, Huiyuan Bian, Ziyu Wang, Tao Luo
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引用次数: 0

Abstract

Red clay is widely distributed globally and is closely related to human production and life. The middle reaches of the Yellow River basin in China are characterized by complex geological structures, concentrated rainfall periods. The soluble salts such as sodium sulfate enter the red clay particles along with the infiltrating water, forming a red clay-like saline soil. In order to study the effects of water and salt on red clay soils, this paper uses red clay in the Heyang of Weinan with different ratios of distilled water (10–20%) and Na2SO4 (0–4%), and obtains the resistivity of red clay soils at different frequencies (100 Hz–100 kHz) using an inductance, capacitance and resistance digital bridge tester. The results show that the resistivity of red clay is negatively correlated with water and salt content. With the increase of water content, the increase of conductive paths in the pore water improved the electrical conductivity of the red clay; while when the concentration of Na2SO4 increased, the free moving anions and cations in the pore water increased, the electrical conduction efficiency increased and the resistivity decreased. The high frequency increased the conductivity of red clay by contributing to electrical double layer deformation, whereas the electrode polarization led to inhibition of conductivity under low frequency. A negative power exponential relationship exists between the resistivity of red clay and the test frequency. This study may provide a valuable reference for the rapid identification of the physical properties of red clay and its internal structure.

含水量和硫酸钠浓度对红土电阻率的影响
红土在全球分布广泛,与人类的生产和生活息息相关。中国黄河流域中游地区地质构造复杂,降雨时段集中。硫酸钠等可溶性盐分随着入渗水进入红粘土颗粒,形成红粘土状盐碱土。为了研究水和盐对红粘土的影响,本文以渭南合阳的红粘土为研究对象,加入不同比例的蒸馏水(10%-20%)和 Na2SO4(0%-4%),利用电感、电容和电阻数字电桥测试仪获得了红粘土在不同频率(100 Hz-100 kHz)下的电阻率。结果表明,红粘土的电阻率与含水量和含盐量呈负相关。随着含水量的增加,孔隙水中导电路径的增加提高了红土的导电率;而当 Na2SO4 浓度增加时,孔隙水中自由移动的阴阳离子增加,导电效率提高,电阻率降低。高频通过促进电双层变形来提高红粘土的导电率,而电极极化会抑制低频下的导电率。红粘土的电阻率与测试频率之间存在负幂指数关系。这项研究可为快速鉴定红粘土的物理性质及其内部结构提供有价值的参考。
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来源期刊
Studia Geophysica et Geodaetica
Studia Geophysica et Geodaetica 地学-地球化学与地球物理
CiteScore
1.90
自引率
0.00%
发文量
8
审稿时长
6-12 weeks
期刊介绍: Studia geophysica et geodaetica is an international journal covering all aspects of geophysics, meteorology and climatology, and of geodesy. Published by the Institute of Geophysics of the Academy of Sciences of the Czech Republic, it has a long tradition, being published quarterly since 1956. Studia publishes theoretical and methodological contributions, which are of interest for academia as well as industry. The journal offers fast publication of contributions in regular as well as topical issues.
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