中文摘要：

吸力对土体抗剪强度的贡献部分称为吸力强度，是非饱和土体抗剪强度的核心变量．土在饱和及非饱和状态下，其有效抗剪强度指标是相同的，基于这一研究结论，可通过常规三轴试验来研究非饱和土的吸力强度．三轴试验结果表明，吸力强度与含水率为准线性关系，二者为负相关；吸力强度与干密度为准线性关系，二者为正相关．在含水率、干密度和吸力强度空间中，吸力强度的分布为一平面．建立了综合考虑含水率和干密度的吸力强度表达式和非饱和黄土抗剪强度表达式，可供工程实践参考．

英文摘要：

Suction strength is defined as the contribution of suction to shear strength, which is also the core variable of un- saturated soil. The effective shear strength index of soil remains unchanged in both circumstances of saturated and unsatu- rated laess. Based on this conclusion, suction strength of unsaturated soil can be studied by conventional triaxial test. Tri- axial test results show that the relation of suction strength and moisture content is of the linear type in, negative correla- tion. The relation of suction strength and dry density is linear that is positively correlated. A function about suction strength is established which includes dry density and moisture content. Distribution of suction strength acts like a plane in water content, dry density and suction strength space. Formulas about shear strength and suction strength of unsatu- rated loss including the impact of water content and dry density are also established, to serve as reference for enineerinu.