Abstract
A series of settlement, cracking, and collapse of the Zhengjiaping slope has been increasingly developing since October 2015 during impoundment at the Dagangshan Hydropower Station. It is a dangerous signal, which means thatlandslide potential will be existed for the Zhengjiaping slope and poses greatthreat to the operation of hydropower station and traffic safety. Related slope protection measures and research studies have been implemented accordingly in the Zhengjiaping slope to prevent and control adverse influences on property security and human life in the reservoir area. In order to understand the geological and hydrological settings of the Zhengjiaping slope and its surroundings, a field investigation was carried out to determine the lithological composition and toppling/sliding deformation characteristics using exploratory adit and site boreholes. The large deformation process in the apparently deformed area was analyzed using borehole inclinometers and global navigation satellite systems (GNSS). It was found that the apparently deformed area zone was characterized by crushed rock masses, with only a small amount of slope deposits and the sliding deformation occurring in Zone I. The deformation process of the reservoir landslide was considered to be a complex integration of the geological effects of various adverse factors. Impoundment and heavy rainfall are the direct causes of sliding deformation. During the preparation of the basic conditions for sliding, lithology, tectonic activity, and artificial disturbances play an important role, including the sliding mass and the sliding surface zone.
Highlights
Reservoir landslides are various types of gravitational mass movements of the earth’s surface that occur on the banks of the reservoir area [1, 2]
Different processes of flexural toppling deformation of bedrock occur on the Zhengjiaping slope, which can be roughly divided into four categories: (1) the disintegration and relaxing deformation zone; (2) the strong toppling deformation zone; (3) the weak toppling deformation zone; and (4) the normal rock stratum zone (Table 2)
Taking the Zhengjiaping slope as a research example, this paper analyzed the influence of geological conditions and water level on the anaclinal rock slope through field investigation and monitoring analysis. e study area of the Zhengjiaping slope is characterized by a fragmentized rock mass and a small amount of slope deposits
Summary
A series of settlement, cracking, and collapse of the Zhengjiaping slope has been increasingly developing since October 2015 during impoundment at the Dagangshan Hydropower Station. It is a dangerous signal, which means thatlandslide potential will be existed for the Zhengjiaping slope and poses greatthreat to the operation of hydropower station and traffic safety. It was found that the apparently deformed area zone was characterized by crushed rock masses, with only a small amount of slope deposits and the sliding deformation occurring in Zone I. e deformation process of the reservoir landslide was considered to be a complex integration of the geological effects of various adverse factors. During the preparation of the basic conditions for sliding, lithology, tectonic activity, and artificial disturbances play an important role, including the sliding mass and the sliding surface zone
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