复杂水工边坡稳定性研究方法探讨

在天然边坡中进行开挖、建造水工建筑物等人类活动,扰动了边坡原有的稳定性,改变了边坡原有的结构,形成更为复杂的水工边坡。水工边坡的稳定性直接关系到水工建筑物的安全,甚至会影响水电工程的安全建设与正常运行。分别采用刚体极限平衡法和有限单元法,对某水电站调压井边坡进行了二维和三维稳定分析。研究结果表明:对于这类有竖井开挖的水工边坡,研究其稳定性时,需进行三维稳定分析;若对这类有竖井的边坡进行二维稳定分析时,应考虑剖面选取的位置,需要综合研究穿过竖井的剖面及竖井周围剖面边坡的稳定性,如果只选取穿过竖井的剖面,则其研究结果往往会与实际出现较大的偏差,使得实际稳定性较好的边坡得出不稳定的结论。研究成果可为此类复杂水工边坡的稳定性分析提供参考。

Research on Methods of Stability Analysis of Complex Hydraulic Slopes

Excavation and construction of hydraulic structures and other human activities in natural slope disturb the original stability of the slope, change the original structure of the slope and then form a more complex hydraulic slope. At the same time, the stability of the hydraulic slope is directly related to the safety of hydraulic structures, and even affects the safety construction and normal operation of the entire project. In this paper, the stability of the surge shaft slope in a hydropower station is analyzed with both rigid limit equilibrium method and finite element method from two-dimension and three-dimension perspectives. The results show that when studying the stability of slopes which have shafts, the three-dimensional analysis is required. When studying the stability of these slopes with two-dimensional method, the position of selected sections should be considered. If the selected sections cross the shafts, the results are usually different from the actual situation and show the slope is unstable while the slope is actually stable. So if two-dimensional method is employed to research the stability of these slopes, the stability of both sections which crosses the shaft and sections beside the shaft should be considered comprehensively. This research serves as a reference for the stability analysis of complex hydraulic slopes with shafts.