基于Geo-slope的Siegle网格密度确定问题

Identification of the Siegel Grid Density within Geo-slope

危险滑动面的搜索是边坡稳定分析的一个核心问题,搜索方法也颇多,一种典型的搜索方法为Siegel网格法。它将坡面上方一定区域划分为大小相等的矩形网格,网格上的每一结点都是需要搜索的滑动圆心;另外在坡体内部设置等距的滑面切线,每一个滑动圆心和每一条切线确定一个滑动圆弧。为了确定边坡稳定计算中合理的Siegel网格密度和切线密度,对某均质土坝,用Geo-slope分析了不同的Siegel网格密度和切线密度对计算结果的影响,得出网格间距≤2.5 m,切线间距≤0.444~0.500 m时计算结果可满足精度要求,并验证了不同的切线方向对边坡稳定计算结果没有影响的结论。

Searching for the dangerous sliding surface is a critical item in slope safety analysis. The Siegel grid is a usable method in searching dangerous sliding surface. For identifying the reasonable Siegel grid density and the tangent density in the slope stability analysis,a homogenous soil dam was adopted. And the affection of the Siegel grid density and the tangent density on the computing results was analyzed by Geo-slope. The results show while the grid distance is less than 2.5 m and the tangent distance is less than 0.444 ～ 0.500 m,the computing result was reliable. In addition,a conclusion was drawn that the orientation of the tangent has no effect on the computing result.