The frequency spectrum characteristics of unsaturated loess based on complex resistivity testing
The accuracy of the results is influenced by capacitive components.This paper focuses on loess in the Yichuan region and establishes the relationship between unsaturated loess matrix suction and complex resis-tivity parameters based on complex resistivity tests and soil-water characteristic determinations.It reveals the variation patterns of their spectral characteristics and derives formulas for loess saturation degree and complex resistivity.The research results indicate that the excitation frequency is negatively correlated with the ampli-tude and phase of complex resistivity.When the frequency is less than 1 000 Hz,the amplitude and phase of loess complex resistivity fluctuate significantly,stabilizing gradually after it exceeds 1 000 Hz.With the in-crease of matrix suction,the amplitude,real part resistivity,and imaginary part resistivity of loess gradually increase、with their correlation influenced by the applied frequency.Loess capacitance and dielectric constant decrease with the increasing matrix suction.A loess saturation degree-complex resistivity model is established using the real part resistivity and imaginary part resistivity,and the model can be used for monitoring moisture changes in loess.The research results provide new methods and perspectives for utilizing the frequency disper-sion characteristics of loess in geological disaster monitoring.
loesscomplex resistivityspectral characteristicsmatric suctionsaturation-complex resistivity model
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