针对干湿循环作用下黄土强度问题，系统地开展了常规三轴试验，提出了黄土结构强度和衰减强度的求取方法，探讨了不同围压和含水率对结构和衰减强度的影响，研究了黄土结构与衰减强度的关系。研究结果表明，黄土结构和衰减强度都随含水率的增大而减小，且呈良好的对数函数关系；结构和衰减强度都随围压的增大而增大，具有良好的线性关系；通过对结构和衰减强度的研究，发现多次干湿循环后原状黄土的强度衰减值与相应的重塑黄土的强度衰减值和黄土的结构强度之和基本相等，证明多次的干湿循环作用不仅仅打破了原状黄土的结构强度，并最终使得其与重塑黄土具有基本相同的土体结构。

In this study, conventional triaxial tests were conducted to systematically investigate the strength characteristics of loess under the conditions of drying-wetting cycles. We proposed the methods for calculating structural strength and decay intensity of loess, and then discussed the effects of confining pressure and water content on structural strength and decay intensity. The relationship between structural strength and decay intensity was studied as well. The results show that the structural strength and decay intensity decrease with increasing water content and reveal a good logarithmic function with water content. The structural strength and decay intensity increase with the increase of confining pressure, which had a good linear function. The attenuated strength value of undisturbed loess after several drying-wetting cycles is almost equal to the sum of attenuated strength value of remolded loess and structural strength. It is proved that the action of the wetting-drying cycle not only broke the original structure of undisturbed loess, but also made the undisturbed and remolded loess have the same structure of soil mass.