重塑黄土的交流电阻率特性试验研究  

Experimental studies on alternating current resistivity of remolded loess

作　　者：周伟[1] 刘彦忠[1,2] 苏楠楠[1] 杨波[1] 董晓强[1,2] 

机构地区：[1]太原理工大学建筑与土木工程学院,山西太原030024 [2]山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006

出　　处：《广西大学学报（自然科学版）》2014年第4期841-846,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51078254);山西省高等学校优秀青年学术带头人支持计划资助;黄土地区公路建设与养护技术交通行业重点实验室开放基金项目(KLTLR-Y13-4)

摘　　要：为探究含水量、干密度及电流频率等因素对黄土电阻率的影响,对重塑黄土进行了室内试验,并分析了重塑黄土在受压过程中的土体结构变化机理。结果表明:当保持干密度一定时,黄土电阻率随着含水量的增加而减小;保持含水量一定时,黄土电阻率随着干密度的增加而逐渐减小;黄土电阻率随着电流频率的升高而逐渐减小并最终趋于稳定,当电流频率范围为50 kHz^1 MHz时,电流频率对黄土电阻率实测值影响较小,电阻率值基本保持稳定。受压过程中重塑黄土的电阻率变化趋势很好地反映了其结构的变化规律,但是在测试电阻率时必须注意频率对测试结果的影响。To study the influence of water content, dry density, and current frequency on the elec-trical resistivity of loess, laboratory experiments of remolded loess were conducted and the structure change mechanism of the loess during compression was analyzed. The results show that the electrical resistivity of loess decreases with the increase of water content when dry density was kept constant;that the electrical resistivity of loess decreases with the increase of dry density when water content was kept constant. The electrical resistivity of loess decreases with the increase of electrical current frequency firstly, and then it tends to be a fixed value. When the current frequency range is 50 kHz ~ 1 MHz, the influence of current frequency on the measured values of electrical resistivity is not clear and the electrical resistivity remains stable. The trend of electrical resistivity change during compression can well reflect the variation of the structure of remolded loess, but attention need to be paid to the effect of current frequency on the measured resistivity.

关 键 词：重塑黄土 电阻率 电流频率 

分 类 号：TU411.2[建筑科学—岩土工程]