The Role of Water and Lithology on the Deformation and Failure of an Anaclinal Rock Slope in a Hydropower Reservoir

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 gre...

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Bibliographic Details
Published in:Advances in civil engineering 2020, Vol.2020 (2020), p.1-13
Main Authors: Zhou, Jia-wen, Bai, Zhi-hua, Tan, Chang-ming, Nie, Wen-ze, Lv, Peng-fei, Chen, Ming-liang, Liao, Yong
Format: Article
Language:English
Subjects:
Boreholes
Civil engineering
Cracks
Deformation mechanisms
Failure
Field investigations
Geology
Global navigation satellite system
Hydroelectric power
Hydroelectric power stations
Hydrology
Inclinometers
Investigations
Landslides
Landslides & mudslides
Lithology
Navigation satellites
Rainfall
Reservoirs
Rock masses
Sliding
Tectonics
Topography
Traffic safety
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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. 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.
ISSN:1687-8086
1687-8094
DOI:10.1155/2020/8852227