阿海水电站复杂层状岩体坝基研究及基础处理措施

Study of Complex Stratified Rock Mass Dam Foundation and Foundation Treatment Measures for Construction of A'hai Hydropower Project

阿海水电站坝基下伏地层主要为泥盆系浅变质岩和后期顺层侵入的辉绿岩条带,地质条件复杂,各向异性明显。通过材料力学法、平面有限元法和三维有限元法对大坝和坝基进行分析,研究复杂层状岩体坝基建高坝的适应性,并提出相应的坝基处理措施。目前大坝已浇筑至坝顶,并于2011年11月上旬进行了初期蓄水,最高水位至1 472.00m,监测结果表明:大坝的变形和应力均符合一般规律,没有出现异常现象,大坝处于稳定状态。

The underlying stratum of the dam foundation for the A＇ hai hydropower project is mainly composed of Devo- nian system epimetamorphic rocks and later bedding intrusive diabase strips, which is characterized by complicated geo- logical conditions and apparent anisotropy. The dam and its foundation were analyzed to verify if the geological conditions of the complex bedding rock mass dam foundation are adaptable to construction of a high dam using the mechanical meth- od of materials, the plane finite element method and the 3 - D finite element method, and then proper dam foundation treatment measures were proposed. Now the dam was concreted to its crest, and initial impounding took place in early November, 2011 with its max. water level at 1,472.00m. The monitoring results indicate that both deformation and stress of the dam are in conformity with the normal laws, no abnormality appeared and the dam has been in a stable state.