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随着各种复杂黄土湿陷问题的呈现,不断有新的地基处理方法得到推广应用,硅化法是主要化学方法之一。为了探究温度改性水玻璃固化黄土在冻融环境下的加固效果,对其进行了冻融特性试验研究。通过控制不同温度的水玻璃溶液配制黄土试样,研究其经过冻融循环的无侧限抗压强度、质量损失以及微观结构的变化特征,分析温度改性水玻璃对加固黄土工程特性的影响和冻融循环对试样的破坏作用机理。试验结果表明:固化黄土试样随着冻融循环次数的增加,质量损失率增加;冻融循环次数相同时,质量损失率随着改性温度的增加而减小;固化黄土样的无侧限抗压强度在冻融初期存在补强作用,以后随着冻融循环次数的增加而减小;改性温度越高,20°Bé水玻璃固化黄土样的冻融循环次数相对值越大。
With the emergence of various complicated loess collapsing problems, new ground treatment methods have been popularized and popularized. Silicification method is one of the main chemical methods. In order to investigate the reinforcement effect of temperature-modified water glass cured loess in freeze-thaw environment, the freeze-thaw characteristics of the loess was studied. The loess samples were prepared by controlling the water glass solution with different temperature, and the unconfined compressive strength, mass loss and microstructure changes after freeze-thaw cycles were studied. The influence of temperature-modified water glass on the engineering properties of the reinforced loess and The destructive mechanism of the freeze-thaw cycle on the sample. The results show that the mass loss rate of cured loess samples increases with the increase of the number of freeze-thaw cycles. When the number of freeze-thaw cycles is the same, the mass loss rate decreases with the increase of modification temperature. The compressive strength has a reinforcing effect in the initial stage of freezing and thawing, and then decreases with the increase of the number of freeze-thaw cycles. The higher the modification temperature, the greater the relative number of freeze-thaw cycles of water-glass cured loess at 20 ° Bé.