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针对非饱和黄土的湿、载屈服特性,利用非饱和土真三轴仪,对不同初始吸力非饱和原状黄土进行常含水率等向固结和不同中主应力参数b值的剪切试验,研究非饱和原状黄土在p-s平面上的屈服曲线和p-q平面上的剪切屈服曲线,建立p-s平面上吸力增加屈服线和加载增湿屈服线的统一表达式;探讨非饱和黄土在不同b值条件下的屈服特性。研究结果表明:屈服吸力是一常数,与土的密度和结构性状相关;吸力增加屈服线和加载增湿屈服线统一描述为抛物线;p-q平面上的剪切屈服线呈曲线,在三维净主应力空间呈屈服曲锥面;随着b值增大,净主应力空间屈服面与k_0圆锥面相交;随着基质吸力减小和b值增大,k_0条件非饱和土可能产生屈服。对分析工程问题具有重要意义。
According to the wet and yield characteristics of unsaturated loess, the triaxial shear tests are conducted on the unsaturated intact loess with different initial suction and the isotropic consolidation with different normal principal stress parameters (b) Unsaturated yielding loess in the ps plane and the shear yielding curve in the pq plane, and establishing a uniform expression of the suction increasing yield line and the loading humidifying yield line in the ps plane; and discussing the unsaturated bauxite under different b values Yield characteristics. The results show that the yield suction is a constant, which is related to the density and structural properties of the soil. The suction yielding and loading yielding curves are uniformly described as parabolas. The shear yielding curves on the pq plane are curved. The space is yield curved cone; as the b value increases, the net principal stress space yield surface intersects the k_0 conical surface; as the matrix suction decreases and the b value increases, k_0 condition unsaturated soil may yield. The analysis of engineering issues of great significance.