基于FLAC^(3D)的寒区正融土坡稳定性数值模拟分析

Numerical simulation research on the melting soil slope stability in seasonal frozen regions based on FLAC^(3D)

为研究季节冰冻区土质边坡在春融期常发生的浅层滑坡,基于连续介质显式拉格朗日有限差分法,耦合温度、土体自重以及渗流力的共同作用,建立季冻区正融土坡实体模型。当外界温度由-5℃升高至10℃时,模拟得出土体边坡内部的塑性区分布特征和剪应变增量的发展趋势,给出季冻区正融边坡的最不利受力位置并分析破坏形式,分析结果可为季节冰冻区土质边坡的稳定性分析提供借鉴。

In order to research the shallow landslide hazards of soil slopes in seasonal frozen regions, continuum explicit finite difference method （FDM） is applied to the research. Considering the temperature, gravity and seepage force, the soil slope solid model of seasonal frozen regions is established. As the outside temperature ranges from --5℃ to 10℃, the simulation presents the characteristic of plastic distribution and the development tendency of shear strain increment inside the soil slope. Then the unfavorable stress position and failure mode of soil slope in seasonal frozen regions are given. The conclusion can cover more reference of the slope stability analysis in the seasonal frozen area.