黄土固结过程中电阻率参数的变化  

Study on changes of electrical resistivity parameters of loess during consolidation

作　　者：苏楠楠[1] 周伟[1] 杨波[1] 刘彦忠[1,2] 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,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,太原030006

出　　处：《中国科技论文》2015年第1期100-104,109,共6页China Sciencepaper

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项目;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资助项目(KLTLR-Y13-4)

摘　　要：为了定量评价黄土固结过程中的微结构变化,采用交流电阻率法研究黄土固结过程中的电阻率结构特性参数(平均结构因子、平均形状因子、各向异性系数)的变化规律,并对比分析了原状黄土与重塑黄土的电阻率参数变化,从结构变化角度解释电阻率参数的变化机理,同时分析了电流频率对电阻率的影响。试验结果表明:原状黄土与重塑黄土的电阻率参数变化规律不同;黄土固结过程中,随着压力的增大,原状黄土与重塑黄土的竖向电阻率先减小后增大、横向电阻率增大、各向异性系数先减小后增大;原状黄土的平均结构因子和平均形状因子先减小后增大,重塑黄土的平均结构因子和平均形状因子增大;各电流频率下的结构特性参数变化规律基本相似,但数值大小存在差异;建议合理的电流测试频率范围为50kHz^1 MHz。The variation of AC resistivity structure parameters of undisturbed loess during consolidation process was studied,including the average structure factor,the average shape factor and the anisotropic coefficient.Electrical resistivity parameters of undisturbed loess and remolded loess were compared and the effects of the current frequency on the electrical resistivity were investigated.The mechanisms of variations in the electrical resistivity were explained according to the structural changes.The results show that the variation modes of undisturbed loess and remolded loess were different.The vertical resistivities of undisturbed loess and remolded loess increase first and then decrease with the increasing of pressure.However,the horizontal resistivities of the undisturbed loess and remolded loess increase with the increase of pressure.The anisotropic coefficients of undisturbed loess and remolded loess decrease rapidly first,then decrease slowly and finally increase slightly with the increase of pressure.The average structure factor and the average shape factor of undisturbed loess decrease first and then increase with the increasing of pressure.The average structure factor and the average shape factor of remolded loess increase with the increasing of pressure.The changing styles of structural parameters are similar under different current frequencies,but the magnitudes vary.Finally a reasonable current frequency range of 50kHz-1 MHz is recommended for testing the electrical resistivity.

关 键 词：黄土 固结 交流电阻率法 结构特性参数 

分 类 号：TU444[建筑科学—岩土工程]