【摘要】 为进一步研究多年冻土边坡在冻融作用下的局部稳定性,针对多年冻土边坡局部冻融的特殊性,考虑冻融循环对边坡土体的损伤作用,基于有限元建立温度场、应力场耦合的多年冻土边坡稳定性分析方法,以东北大兴安岭多年冻土地区某路堑边坡为研究对象,对边坡的冻融过程以及稳定性进行分析。结果表明:在冻融作用下,边坡季节活动层融化深度与环境温度有较强的相关性;坡顶特征点位移随时间变化趋势呈"台阶"状,可分为快速发展阶段和稳定发展阶段;比较有限元方法与极限平衡法计算结果的差异,证明了有限元方法的合理性,对多年冻土边坡防护治理有很好的指导意义。更多还原

【Abstract】 In order to further analyze the local stability of permafrost slope under freeze-thaw cycles, we established temperature field and stress field coupling stability analysis method of permafrost slope based on the finite element method, which mainly focus on local freeze-thaw peculiarity of permafrost slope and also consider the damage of soil under freeze-thaw cycles. A cutting slope of permafrost regions in the Greater Khingan Mountains of Northeast China was taken as an example The results showed that the melting depth of the seasonal active layer in the slope has a strong correlation with the ambient temperature under freeze-thaw cycles; The displacements of feature point on the slope has a shape of "stage" with time, which can be divided into a rapid development stage and a stable development stage; It is proven that the rationality of the finite element method by compared the difference between the finite element method and the limit equilibrium method is very useful for the protection and treatment of permafrost slope.更多还原