通过滑面应力状态评价滑坡稳定性

Landslide Stability Assessment by Stress State on Sliding Surface

以黄河上游某大型滑坡为例,研究了有限元法在评价滑坡稳定性中的应用。具体操作过程是:建立滑坡的有限元模型,求出滑面上的应力状态,计算滑面上总的抗滑力与总的滑动力之比,最后评价滑坡的稳定性。通过对黄河上游某大型滑坡比较研究发现,采用有限元法比传递系数法得出的稳定性系数高0 0 7,这种差异属允许差异范围。采用有限元法计算该滑坡在天然与地震两种条件下的稳定性系数分别为1 14和1 1,可以认为滑坡在两种条件下的稳定性较好。该方法原理正确、操作简单、结果可信度高。

This paper took a landside in upstream of Huanghe River for an example, and studied finite-element method application in landside stability assessment. First, created finite-element model, then calculated stress of sliding surface, at last, calculated ratio of total resistance force and total sliding force on sliding surface and assessed the stability of the landslide. By comparison studying of this landside, stability coefficient by finite-element method waso .07 higher than by limit equilibrium method, and this difference was allowable difference. The stability coefficients of landside were 1.14 and 1.10 in nature and earthquake conditions by finite-element method, and these results proved that the landside was stable in these two conditions. This method had correct principle, simple operation and high credence results.