库区滑坡稳定性二维、三维分析与应用

2D and 3D stability analysis of landslides in reservoir areas and its application

库区滑坡的地形、滑床及其地下水位面等几何形状复杂,具有典型的三维特征,为了更合理地分析评价其稳定性,在同等条件下选取二维剩余推力法和三维极限平衡法同时进行计算对比分析。以某库区滑坡作为实例,分别运用二维、三维方法反演确定其强度参数,计算各典型库水位下的滑坡稳定系数,并对滑坡稳定系数在水库水位变化(包括上升和下降变化)的情况下进行了敏感性对比分析。结果表明,三维方法的计算分析结果更为客观、合理;而且综合二维、三维计算结果进行分析,可得到符合实际的结论,为分析评价库区滑坡稳定性提供了一条好的途径。

The topography, sliding surface and ground water level of landslides in reservoir areas would appear with complex geometries and typical 3D features. To evaluate their stabilities more rationally, the analysis could be adopted by use of 2D residual thrust method and 3D limit equilibrium method under the same condition. For a practical example from a reservoir area, some aspects were processed by 2D and 3D methods respectively, such as the inversion of two strength parameters, the calculation of stability factors in various typical water levels of the reservoir, and the sensitivity analysis of stability factors under the condition of rising and drawdown of water levels. It was indicated that 3D method was more rational and more objective than 2D method. And, through the integrated analysis of the 2D and 3D results, the better conclusion of the slope stability could be gained. Therefore a better way to evaluate the stability of landslides in reservoir areas would be proposed.