电阻率法研究双液硅化加固过程中黄土的结构变化

通过连续测试双液硅化加固过程中黄土的电阻率变化。计算得到了电阻率结构特性参数的变化规律,包括土的平均结构因子、平均形状因子与各向异性系数。分析了加固过程土体结构的变化机理。试验结果表明: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 k Hz~1 MHz时,电流频率对黄土电阻率实测值影响较小;双液硅化加固过程中,竖向和横向电阻率均随着时间的增加先减小,最终保持稳定,且减小趋势均集中在初始阶段。平均结构因子和平均形状因子均随时间的增加先减小,最终趋于稳定。各向异性系数随时间的增加先快速增大,并最终趋于稳定。

Study on structure of loess using resistivity method during the process of silicified double solution grouting

Resistivity of loess was continuous tested during silicified double solution grouting process. The changing rules of electrical parameters were analyzed, include soil average formation factor, average shape factor and the anisotropy coefficient. And the change mechanism of loess structure was investigated. The results show that the electrical resistivity of loess decreases with increasing electrical current frequency firstly, and then tends to a fixed value. When the electrical current frequency range is 50 kHz~1 MHz, the influence of electrical current frequency on the measured values of electrical resistivity is not clear. The vertical resistivity and the horizontal resistivity decreases with increasing time and finally keeps stable during the process of silicified double solution grouting process,and the decreasing trend is concentrated in the initial stage. The average formation factor and the average shape factor decrease with increasing time and finally keep stable. The electrical anisotropy index increases rapidly with increasing time firstly and eventually stabilized.