Journal
ENGINEERING GEOLOGY
Volume 195, Issue -, Pages 1-15Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.enggeo.2015.05.017
Keywords
Rockslide; Monitoring; PTA-InSAR; Kinematic behavior
Funding
- Ministere des transports du Quebec, Transports Canada and the Ministere de l'education, des sports et des loisirs
- les Fonds de recherche nature et technologies du Quebec
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The monitoring of the 410 000 m(3) coastal Gascons rockslide, began in 2009. This paper presents and analyzes combined in-situ and satellite-based monitoring data to interpret the kinematic behavior of the slide and the evolution of the rockslide and the possible mechanisms that can lead to an accelerating phase of movement. The available data are (1) relative displacements, measured by thirteen crackmeters and manually with an extensometer tape; (2) absolute displacements, obtained from inclinometers and vertical shape accelerometer arrays in boreholes, total station surveys, and satellite-based point-target-analysis-InSAR (PTA); (3) the settlement of the railway ballast monitored by two horizontal shape accelerometer arrays; (4) groundwater pressures from nine vibrating wire piezometers; and (5) weather conditions. The study indicates that the role of water on displacements varies spatially within the rockslide. The rockslide's kinematic behavior enables us to develop evolution scenarios of the rockslide, which could be useful to conduct a risk analysis. This leads to the identification of critical zones for railroad safety. The unique set of monitoring data helps to elucidate the complexity of the rockslide's behavior. (C) 2015 Elsevier B.V. All rights reserved.
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