季冻区土质边坡滑动界面临界深度的试验研究

为研究季节冰冻区土质边坡春融期常发生的浅层滑坡灾害,考虑盐水冰点低于水的冰点这一物理特性,设计了模拟土坡内部冻融界面的试验方法。比较了在不同含水率时,经冻融循环后土质边坡滑动面的临界深度,验证了在冻融界面上土质边坡的破坏形态,根据试验结果拟合了符合本文土样条件的土质边坡滑动面临界深度的损伤模型。分析表明,冻融循环后,随含水率和冻融循环次数的增加,边坡滑动破坏的临界深度值逐渐减小,经对试验数据拟合提出的临界深度随冻融循环损伤模型,可为季节冰冻区的边坡设计提供参考。

Experimental research on critical depth of slip surface of soil slope in seasonal frozen area

In order to study the shallow landslide hazard of soil slope during the spring melt period in seasonal frozen areas, considering that the freezing point of the brine is lower than pure water, a simulated test method of the internal freezing and thawing interface of soil slope is designed. The critical slip surface depths after freeze-thaw circles in different water contents are compared in the test; and the failure modes of the internal freezing and thawing interface of soil slope are verified. Then the sliding face depth damage model of the soil slope is put forward according to the experimental data. The results demonstrate that with the increasing water content and freeze-thaw circle times, the value of critical slip surface depth decreases gradually after freeze-thaw circles; the damage model which is obtained from the experimental data fitting, would present more reference of the slope design in the seasonal frozen area.