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为了解冻融作用对黄土湿陷性的作用效果,以Q3黄土为研究对象,采用增(减)湿法配制不同含水量黄土试样,测试黄土在无补水条件下受温度影响的冻融变形、压缩变形和湿陷变形;对原状黄土进行颗粒分析及基本物理力学参数试验。分析表明:(1)黄土是否产生冻胀取决于其含水量是否超过“临界冻胀含水量”。(2)冻融黄土与原状黄土相比压缩变形量较大,把部分浸水湿陷变形转化为压缩变形,冻融作用使黄土的湿陷性弱化。(3)冷冻黄土在相同温度下,含水量越大,湿陷系数越小;在同一含水量下,冻结温度愈低湿陷系数愈小。
In order to understand the effect of freeze-thaw on loess collapsibility, Q3 loess was used as the research object, the loess samples with different water contents were prepared by increasing (decreasing) wet method, and the freeze-thaw deformation of loess under no water replenishment , Compressive deformation and collapsible deformation; particle analysis of the original loess and the basic physical and mechanical parameters of the experiment. The analysis shows that: (1) Whether the loess produces frost heave depends on whether its water content exceeds the critical frost heaving water content. (2) Compared with undisturbed loess, the freeze-thaw loess is larger in compressive deformation than that of undisturbed loess, which transforms some of the subsidence deformation into compressive deformation, and the freeze-thaw action weakens the loess collapsibility. (3) Frozen loess at the same temperature, the larger the water content, the smaller the collapse coefficient; at the same water content, the lower the freezing temperature the lower the collapse coefficient.