In this paper, the change of electrical resistivity and matric suction with volumetric water content is investigated using the electrical resistivity measurement and pressure plate test for different densities compacted granite residual soils. The results show that the resistivity value decreases with increasing water content and dry density, and tends to constant at higher values. The shapes of the soil-water characteristic curve (SWCC) and electrical resistivity-water characteristic curve (RWCC) of the investigated soils are very similar. Both curves of RWCC and SWCC can be well described by the van Genuchten model and observed a better correlation i.e., the fitting parameters of RWCC and SWCC are linearly proportional to each other. Based on these two characteristic curves mentioned above, the modification of the van Genuchten model is proposed to develop a direct relationship between electrical resistivity and matric suction for the compacted residual soils. Moreover, the comparison of fitting parameters of the resistivity-matric suction characteristic curve with RWCC and SWCC parameters is also linearly proportional to each other. It can be concluded that the matric suction is strongly depend on the electrical resistivity of the soil, after knowing the fitting parameters of the RWCC, it may be possible to predict the SWCC from the resistivity data.
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机译：本文利用电阻率测量和压板试验研究了密度不同的压实花岗岩残余土的电阻率和基质吸力随体积含水量的变化。结果表明，电阻率值随含水量和干密度的增加而减小，并在较高值时趋于恒定。被调查土壤的土壤-水特征曲线（SWCC）和电阻率-水特征曲线（RWCC）的形状非常相似。 van Genuchten模型可以很好地描述RWCC和SWCC的两条曲线，并且观察到更好的相关性，即RWCC和SWCC的拟合参数彼此成线性比例。基于上述两条特性曲线，提出了van Genuchten模型的修正，以建立压实残余土壤的电阻率与基质吸力之间的直接关系。此外，电阻率-矩阵吸力特性曲线的拟合参数与RWCC和SWCC参数的比较也彼此成线性比例。可以得出结论，基质吸力在很大程度上取决于土壤的电阻率，在知道RWCC的拟合参数后，可能可以从电阻率数据预测SWCC。
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