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为分析冻融作用对黄土湿陷性的影响,采用室内试验方法。首先,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,测试黄土在无水补给条件下受温度影响的冻融变形、压缩变形、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。试验结果表明: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”。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。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。
To analyze the effect of freeze-thaw on the collapsibility of loess, an indoor test was used. First of all, Q3 loess was taken as the research object, the loess samples with different water contents were prepared by increasing (decreasing) wet method, and the freeze-thaw deformation, compressive deformation and collapsible deformation of loess under the condition of anhydrous supply were tested. Particle analysis and basic physical and mechanical parameters of the experiment. The test results show that whether the loess produces frost heave depends on whether the water content exceeds the critical frost heaving water content. Compared with undisturbed loess, the frozen and thawed loess has larger compressive deformation, which transforms part of the subsidence into collapsible deformation, and weakens the collapsibility of the loess by the freeze-thaw action. Frozen loess at the same temperature, the greater the water content, the smaller the collapsibility coefficient; the same water content, the lower the freezing temperature collapsing coefficient is smaller.