试验和分析表明，在较大的含水量变化范围内，非饱和黄土的粘聚力和含水量之间呈幂函数关系。依据库伦－摩尔强度准则，非饱和黄土的抗剪强度随外部压力和含水量的变化规律可用强度曲面描述，提出了非饱和黄土强度的临界含水量计算式。 Tests and analysis show that the unsaturated loess has a power function relationship between the cohesion and moisture content within a large range of water content changes. According to the Coulomb-Moore strength criterion, the shear strength of unsaturated loess with external pressure and water content can be described by the intensity surface, and the critical moisture content of unsaturated loess is calculated.