中文摘要：

为研究压实黄土的压缩特性和沉降计算模型,开展了不同压实度、不同含水量下的压实黄土侧限压缩试验,分析了压力、含水量、压实度以及结构性对压实黄土压缩变形量及变形过程的影响,提出了结构性的表示方法及结构强度的计算方式,引入割线模量表达法并推导出了压实黄土加压过程的结构性本构模型及增湿本构模型。结果表明：压实黄土的压缩性随着压实度的增大而减小且压力越大减小越明显;压缩性随着初始含水量的增大而增大且塑限前后差别明显;压实黄土具有增湿变形性质,增湿变形系数随压实度的增大而减小、随增湿含水量的增大而增大;高压实度下的黄土具有结构性且结构强度随着含水量的增大而减小、随着压实度的增大而增大,据此推导出的加压结构性本构模型和增湿本构模型精度更高、物理意义更加明确。

英文摘要：

Series of compression tests were conducted with various compactness and water content for compressibility studies and constitutive modeling of compacted loess. The results indicate that the compressibility of compacted loess decreases with the increasing compactness. The higher the load,the larger the deduction is. Furthermore,the compressibility of compacted loess increases with the increasing water content,while large difference in results was observed before and after the plastic limit. Compacted loess is subjected to wetting induced deformation. The coefficient of the wetting induced deformation decreases with the increasing compactness and increases with the increasing water content. Loess subjected to high compactness has the following structural properties. The structure yield strength decreases with the increasing water content, and decreases with the increasing compactness. The loading constitutive model and wetting constitutive model were derived based on the test results and analyses. Compared with the previous studies,this model performs better physical relationships and obtains more accurate solutions.