黄土属于水敏感性地质材料,不同含水量条件下黄土-加筋带接触面强度明显不同.为了获得此接触面剪切强度随含水量的变化规律,进行了系列不同含水量条件下黄土-加筋带接触面的直接剪切试验研究.试验结果表明,不同含水量的接触面剪切强度均满足莫尔-库仑准则,内摩擦角和黏聚力随含水量的增大而非线性减小.利用该试验结果对某黄土基坑加筋墙设计方案进行了不同含水量条件的校核,结果表明原方案没有考虑含水量增大对加筋墙内部稳定性的削弱作用,存在安全隐患,最后对原方案进行了修改使之满足含水量适当增大条件下的加筋墙内部稳定要求. Loess belongs to water-sensitive geological materials, and the contact strength of loess-stiffened zone under different water content is obviously different.In order to obtain the change law of the shear strength of this interface with the variation of water content, The results of direct shear tests show that the shear strength of contact surfaces with different water contents meet the Mohr-Coulomb criterion, and the internal friction angle and cohesion decrease non-linearly with the increase of water content The test results of a loess foundation pit reinforced wall design scheme were checked for different water content conditions, the results show that the original program does not take into account the water content increases the weakening of the internal stability of reinforced walls, there are potential safety problems, Finally, the original plan was modified so as to meet the requirements of internal stability of stiffened walls with appropriate water content.