雾雨作用下的非饱和边坡稳定性研究

Stability analysis of unsaturated soil slope under atomized rain

提出了一种雾雨作用下非饱和边坡的稳定性分析方法.采用模糊综合评判理论预测挑流泄洪雾化降雨量;将有限元法应用于模拟降雨入渗引起的边坡饱和非饱和暂态渗流场;采用有限差分法分析滑坡在渗流荷载作用下的稳定性.研究中综合运用了泄洪雾化降雨量的预测结果及渗流场的模拟结果,并在力学分析中直接使用了渗流分析的有限元网格,使得渗流力的考虑更加精确.以水布垭水电站坝区台子上滑坡为工程实例,分析了台子上滑坡在雾雨作用下的非饱和边坡稳定性问题,所得结论符合实际.

With the project of the Taizisang Slope at the Shuibuya Hydropower Station as an example, an approach is presented to analysis of the stability of the unsaturated soil slope under the action of atomized rain. The fuzzy synthetic evaluation method is used to evaluate the atomized rain intensity of jet overflow; the finite element method is used to simulate the atomized rain infiltration induced saturatedunsaturated seepage flow fields; the finite differential method is used to analyze the slope stability under the infiltration. In calculation, the analyzed results of the former stage are used in analysis of the later stage, and the FEM mesh and the seepage fields obtained in seepage analysis are directly used in the FDM Code for stability analysis, thus improving the analytic precision of seepage forces. The analyzed result and practical situation are in good agreement.