高密度电法通过探测边坡土体电阻率反演其地质结构特征，进而为边坡稳定性分析提供地质模型，但土体抗剪强度指标的电阻率间接评价仍然受限。以边坡上红黏土为例，开展不同干密度、含水率红黏土试样的电阻率、抗剪强度试验，探讨电阻率与不排水抗剪强度的相关性，构建非饱和红黏土电阻率与不排水抗剪强度的量化关系模型。结果表明：红黏土电阻率随着含水率增加而逐渐减小，随着孔隙率增大而逐渐增大；红黏土不排水抗剪强度随含水率增加呈现先增大后减小趋势（最优含水率附近抗剪强度达到峰值），而随着孔隙率增大而逐渐减小；从非饱和土体三相导电理论出发，结合土体抗剪强度理论，推导得出考虑临界饱和度的非饱和红黏土不排水抗剪强度的电阻率评价模型，经验证模型精度较高，红黏土不排水抗剪强度峰值变化存在对应的临界电阻率值。电阻率作为土体物性参数能够快速探测获取，该模型可为红黏土边坡土体抗剪强度标定、边坡稳定性分析及其监测预警提供新思路。

The slope geological structure characteristics is detected with the high density resistivity method by the inversion of the soil resistivity, and it could provide a geological model for slope stability analysis. However, the indirect evaluation of the resistivity for the soil shear strength is still limited. Taking the laterite on the slope as an example, the resistivity and shear strength of laterite samples with different dry density and water contents were tested to discuss the relationship between the resistivity and undrained shear strength of the laterite, and finally the corresponding quantitative model was established. The results show that the resistivity of laterite decreases with the increasing water content and increases with the increasing porosity. The undrained shear strength of laterite increases first and then decreases with the increasing water content (the peak of shear strength near the optimal water content) and decreases with the increasing porosity. The evaluation model of undrained shear strength resistivity of unsaturated laterite considering critical saturation is derived, which is based on the three-phase conductivity theory of unsaturated soil and the shear strength theory of soil. The accuracy of the model is verified to be high, and there is a corresponding critical resistivity value for the peak change of undrained shear strength of laterite. As a physical parameter of soil, resistivity can be quickly detected and obtained. This model can provide new ideas for shear strength calibration, slope stability analysis and monitoring and early warning of laterite slope.