湿度变化对土壤电阻率的影响研究  

Effect of humidity change on soil resistivity

作　　者：孙旭[1] 杨庆义[1] 高兰 李振宇[2] Sun Xu;Yang Qingyi;Gao Lan;Li Zhenyu(Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Jinan 250013,China;China University of Ceoseiences (Wuhan),Wuhan 430074,China)

机构地区：[1]山东电力工程咨询院有限公司,济南250013 [2]中国地质大学(武汉),武汉430074

出　　处：《工程勘察》2019年第1期35-40,共6页Geotechnical Investigation & Surveying

摘　　要：本文选取三种具有代表性的扰动土——粘土、粉土和砂土,根据控制变量法的思想,改变某一种影响因素,采用物性参数测定技术中的强迫电流法,通过自制模型测量不同含水率下土壤的电阻率值。然后,对试验数据拟合,获得经验公式,并对影响规律进行详细分析和对比。试验结果表明,土壤电阻率随含水率的增加而减小。当含水率较小时,电阻率对土壤含水率敏感,呈指数衰减,当土壤含水率达到一定值(15%左右)后,土壤电阻率随含水率的增加而减小的幅度明显降低,并趋于稳定。纵向对比粘土、粉土和砂土的试验曲线,低含水率(干燥)时土壤电阻率差异性大于高含水率时的情况,在含水率达到30%以后,三种土壤的电阻率基本一致。The soil resistivity at different moisture content was determined of a self-made model of three typical disturbed soil including clay, silt and sand according to the control variable method, changing one of the influencing factors, using forced current method in the physical parameters measurement. The empirical formula was obtained after the experimental data fitting, and the influence rules were carefully analyzed and compared. The experimental results show that the soil resistivity decreases with the increase of moisture content. When the moisture content is small, the resistivity is sensitive to the soil moisture content, and it decays exponentially. When the soil moisture content reaches a certain value(about 15%), the soil resistivity decreasing rate with the moisture content increases reduce significantly and trend to a stabile value. Comparing the experimental curves of clay, silt and sand, the difference of resistivity at low moisture content or dry is greater than that with high moisture content. When the moisture content reaches 30%, the resistivity of the three soils is almost the same.

关 键 词：土壤电阻率 影响因素 湿度 含水率 

分 类 号：TU411[建筑科学—岩土工程] P3[建筑科学—土工工程]