中文摘要：

摘要：依据土体结构性观点，通过分析增湿过程中黄土结构性变化机理，提出黄土结构损耗的概念，建立定量化描述黄土结构损耗的参数——增湿黄土结构损耗参数和增湿与荷载耦合时黄土的结构损耗参数，并研究增湿及其与荷载耦合作用对原状黄土结构损耗的影响规律。研究结果表明：增湿结构损耗参数随增湿含水率的增大而增大，且呈现下陡上缓的增长特点；增湿湿陷系数与增湿结构损耗参数之间具有较好的线性关系表明黄土结构损耗是黄土湿陷的内在原因；无论增湿还是加荷均会造成土体结构损耗，使增湿和荷载耦合作用下黄土的结构损耗参数随增湿含水率和荷载等级的增大而增大。

英文摘要：

From the viewpoint of soil structural properties, the concept for the loss in structure of undisturbed loess was put forward according to the mechanism analysis of the loess structural variation during the moistening process. Quantitative parameters were given to describe the loss in loess structure, i.e. the parameter of loss in moistening loess structure and the parameter of loss in moistening-loading loess structure, and the effects of moistening and moistening- loading on the loss in structure of undisturbed loess were investigated. Research results show that the parameter of loss in moistening structure increases with the moistening water content characterized by the reduced slope of the curve. A good linear relationship between the moistening collapsibility parameter and the parameter of loss in moistening structure indicates that the loss in loess structure is the inherent reason of loess collapse. Both moistening and loading may cause the loss in loess structure. The parameter of loss in loess structure may increase with the moistening water content and the load level under the combined influence of moistening and loading.