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黄土通常可作为公路路基主要的填筑材料,湿陷性黄土经压实后,很大程度消除了湿陷性,能够满足路基整体强度和稳定性的要求,但在季节冻土区,黄土路基运营几年后仍发生大量的不均匀沉降、塌陷等病害。为分析冻融循环作用下各级含水率对黄土湿陷性的影响,采用室内试验的方法,对湿陷性黄土进行不同的冻融次数,探究其在冻融循环过程中变形及冻融循环后湿陷情况。实验结果表明:冻融循环之后的各级含水率重塑黄土仍具有二次湿陷性;冻融循环作用下高含水率的土体结构比低含水率的土体结构破坏的较早;干密度一定时,低含水率的土体冻融循环之后的净变形量越大,湿陷系数越小,冻融循环之后的净变形量越小,湿陷系数越大。
Loess is usually used as the main filling material of highway subgrade. After compaction, collapsible loess has largely eliminated the collapsibility and can meet the requirements of overall strength and stability of subgrade. However, in the area of permafrost, loess subgrade After a few years of operations there still occurred a large number of non-uniform settlement, collapse and other diseases. In order to analyze the effect of moisture content at different stages on the collapsibility of loess under freeze-thaw cycles, different numbers of collapsible loess were subjected to freeze-thaw cycles by means of laboratory test. After the collapse of the situation. The experimental results show that the remolded loess at various levels after freeze-thaw cycles still has secondary collapsibility. The soil structure with high water content under the freeze-thaw cycle destroys earlier than the one with low moisture content. When the density is constant, the net deformation after soil freeze-thaw cycles with low water content is larger and the collapsibility coefficient is smaller. The net deformation after freeze-thaw cycles is smaller and the collapsibility coefficient is larger.