某水电站库区岩体倾倒变形因素与变形机理

Influencing factors and mechanism of rock mass toppling deformation in a reservoir area of hydropower station

澜沧江流域某水电站库区倾倒岩体发育范围广、变形程度剧烈,从河谷地貌、地层岩性、岩体结构、地应力和水特征等方面开展论述,分析其如何对岩体倾倒变形产生作用,并进一步阐明变形机理。结果表明,5种因素共同作用导致岩体发生倾倒变形,并将倾倒变形分成倾倒蠕变、倾倒松弛、倾倒松动和倾倒溃屈4个阶段。在工程建设中正确认识倾倒变形岩体的产生和发育过程,对库岸的稳定性分析具有重要意义。

The dumping rock mass in the reservoir area of a hydropower station in the Lancang River basin has a wide development range and severe deformation.This paper discusses the valley landform,formation lithology,rock mass structure,ground stress and water characteristics,analyzes how they affect the dumping deformation of rock mass,and further clarifies the deformation mechanism.The results show that the five factors together lead to the toppling deformation of rock mass,and the toppling deformation is divided into four stages:toppling creep,toppling relaxation,toppling loosening and toppling buckling.It is of great significance for the stability analysis of reservoir bank to correctly understand the generation and development process of toppled deformed rock mass in engineering construction.