Toppling slope is a kind of special slope which has been deformed, and may eventually develop into serious geological disasters such as landslide and collapse. The engineering geological characteristics of toppling slope is the basis of slope stability analysis and evaluation and treatment scheme design, At present, the relevant research work in China is not in-depth and systematic, which is difficult to meet the needs of engineering construction and geological disaster prevention and control in the new era. Zara hydropower station is planned to be built on Yuqu River, the first tributary of Nujiang River in Tibet, Qinghai Tibet Plateau, The slope toppling in the project area is generally developed, which has a great influence on the site selection and safe operation of the project, There are various types of soft rock and hard rock in the area, and the toppling mode is complete. It is typical to carry out relevant research. It took several years from preliminary investigation, detailed investigation to special research to demonstrate in detail the engineering geological characteristics of the slope rock mass. Through the exploration and successful application of many innovative technologies, the problems in the study of the engineering geological characteristics, such as the definition of the spatial scope of the toppling slope, the division of the engineering geological area and the value of the shear strength parameters, are solved. By means of Surveying and mapping, hole exploration, drilling, geophysical exploration, testing and testing, the scope of the slope is accurately defined, and the appropriate comprehensive exploration methods are put forward. Based on the rock mass structure and the type of deformation and failure, the dumped rock mass of the slope is divided into three areas for the first time, i.e., layered bending, fragmentation and tension, and falling and covering of loose
