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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。
In order to study the compression characteristics and settlement calculation model of compacted loess, compression tests of compacted loess under different compaction degrees and different water contents were carried out. The effect of pressure, water content, compaction degree and structure on compaction loess Compressive deformation and the influence of deformation process, a structural representation method and calculation method of structural strength are put forward. The secant modulus expression method is introduced and the structural constitutive model and the humidifier Model. The results show that the compressibility of compacted loess decreases with the increase of compaction degree and the pressure decreases more obviously. Compressibility increases with the increase of initial water content and the difference between before and after plastic confinement is significant. The real loess has the properties of humidification and deformation, and the deformation coefficient of humidification decreases with the increase of compaction degree, and increases with the increase of moisture content. The loess under high compaction has structural and structural strength with the The water content increases and decreases, and increases with the degree of compaction. Therefore, the pressure constitutive model and the humidification constitutive model derived from this model are more accurate and the physical meaning is more clear.