某水电站坝肩顺坡向变倾角岩质边坡变形破坏机制研究

受岩层倾角变化的影响,某电站右坝肩变倾角岩质边坡在工程开挖后,上部和下部岩体均出现不同程度变形破坏迹象,并且其特征存在较大差异.作者在大量现场调查的基础上,从边坡工程地质条件、岩体结构特征着手分析了边坡变形和破坏特征产生差异的内在原因;并结合有限元数值模拟方法,研究了边坡产生变形和破坏的力学机制.在此基础上提出了这类边坡变形破坏特征及其成因机制的概念性模型.

Study on the deformation and failure mechanism of consequent slopes at a dam site of a hydropower station in southwestern China

Because of the variation of the dip angels of rock strata, the consequent rock slope at the right dam site of a hydropower station in southwestern China shows special deformation and failure characteristics. The authors investigated the phenomena of the slope deformation in the slope cutting and thought that the variation of the rock strata was the main factor controlling the slope failure. Based on these, a slope deformation evolution pattern and its conceptual model were established. The fundamental mechanism model was sliding-bending with local shearing failure. Furthermore, a numerical modeling was carried out for the slope. The results show the displacement at different positions along the rock strata with the slope cutting and reveal the similar pattern indicated in the conceptual model. The achievements had been used to help the consultant to make the reasonable countermeasures of the slope protection.