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为了分析结构性黄土在复杂应力路径(非侧限压缩路径)下浸水和加荷的次序对黄土湿陷变形的影响以及探讨黄土在双轴剪切和浸水时粒间胶结破坏行为,本文应用分层欠压法制备出非饱和结构性黄土离散元试样,进行了单线法(不同增湿路径:一次增湿、逐步增湿)和双线法双轴数值湿陷试验。结果表明:单线法在某偏应力水平下浸水所得轴向湿陷应变大于双线法;当增湿偏应力大于增湿后试样的强度时会产生湿陷破坏。逐步增湿引起的体积变形小于一次增湿试验;逐步增湿比一次增湿胶结破坏点数量少。
In order to analyze the influence of submergence and loading sequence of structural loess on collapse deformation of loess under complex stress path (unconfined compression path) and to explore the intergranular cementation failure behavior of loess during biaxial shearing and water immersion, Layer undervoltage method was used to prepare unsaturated structural loess discrete element samples. Single-line method (different humidification paths: primary humidification and gradual humidification) and two-line numerical double-axis numerical collapse test were carried out. The results show that the axial wetting strain obtained by immersion in single-line method is greater than that of double-line method. When the wetting deviatoric stress is greater than the strength of the sample after wetting, it will produce collapsible collapse. The volume deformation caused by gradual humidification is less than one humidification test; the number of wetting and destructing steps is smaller than that of single humidification.