重塑黄土固结过程中电阻率参数变化研究

Study on the electrical resistivity parameters of remolded loess during consolidation

通过测试重塑黄土固结过程中不同电流频率下的横向和竖向电阻率,分析了其电阻率结构特性参数(平均结构因子、平均形状因子与各向异性系数)的变化规律,结合微结构的变化探讨了其机理。试验结果表明:重塑黄土固结过程中,竖向电阻率随着竖向压力的增加先减小,减小过程集中在初始阶段(0<p≤50kPa),超过这一压力范围后,竖向电阻率呈上升趋势;横向电阻率随着竖向压力的增加先增大后减小,最后呈增大趋势;平均结构因子与平均形状因子均随竖向压力的增加先增大后减小,最终呈增大趋势;各向异性系数随竖向压力的增大先快速减小,并最终趋于稳定;各个电流频率下的电阻率参数值变化规律相似,但数值大小有异。

The horizontal and vertical resistivities of remolded loess based on different electrical current frequencies during consoli-dation were measured.The changing rules of the electrical formation parameters of remolded loess were analyzed,including the average formation factor,the average shape factor and the electrical anisotropy index.Its mechanism was discussed in combina-tion with microstructure changes.The results show that：vertical resistivity decreases with the increase of vertical pressure during initial stage （0＆lt;p≤50 kPa）and then is on the rise;horizontal resistivity decreases with the increase of the vertical pressure after the first increase,and finally shows a trend of increase;the average formation factor and the average shape factor decrease with the increase of vertical pressure after the first increase,and finally show a trend of increase;the electrical anisotropy index rapidly decreases with increasing vertical pressure and keeps stable finally;the changing rules of resistivity parameters are similar under each current frequency,but with different values.