Geological Survey and Unstable Rock Block Movement Monitoring of a Post-Earthquake High Rock Slope Using Terrestrial Las
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ORIGINAL PAPER
Geological Survey and Unstable Rock Block Movement Monitoring of a Post‑Earthquake High Rock Slope Using Terrestrial Laser Scanning Hai‑bo Li1 · Shun‑chao Qi2 · Xing‑guo Yang1 · Xiao‑wen Li2 · Jia‑wen Zhou1 Received: 24 December 2018 / Accepted: 17 June 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Local topography and structural features of discontinuities have a great effect on the movement characteristics and failure mechanisms of the unstable rock blocks of the rock slope. By taking full advantage of the geometric information contained in the multi-temporal terrestrial laser scanning (TLS) point clouds, a technique based on a roto-translation method has been developed to track and monitor the movement behavior of blocks in unstable rock slopes. The technique can be completed in three stages: (a) a preliminary change detection is used to distinguish the unstable area by means of a shortest distance (SD) algorithm; (b) an automatic discontinuity identification algorithm is implemented to visually identify the discontinuity sets and to exactly delineate rock blocks in unstable areas; and (c) finally a roto-translation movement monitoring method is applied to track and monitor the unstable rock blocks. This technique permits the user to visually identify the discontinuity sets and to determine their orientation, and therefore provides detailed information of geometric compounding relationships between the slope and joint systems as well as the forming rock blocks which are the key impacts to stability of the rock slope. It permits the user to exactly and visually delineate the rock blocks in the unstable area, and thus the completely tracking and monitoring of lock block movement in unstable rock slopes can be effectively conducted. It overcomes the limited precision of the single TLS points and provides an actual 3D movement measuring method for the blocks rather than a shortest distance. The technique was first used in the movement behavior monitoring of the unstable rock blocks in a post-earthquake high rock slope. The results show that the rock block movement monitoring technique is well suited for providing high-quality data in the assessment of rock failure hazards. Keywords Terrestrial laser scanning · Rock block movement monitoring technique · Automatic discontinuity identification algorithm · Rock block delineation · Roto-translation movement
1 Introduction Rock slope is generally shaped by the dominate discontinuity sets (Selby 1982; Hu et al. 2020). Rock block is formed by the intersecting discontinuities, which has great effect on the deformation and failure of the rock slope (Priest 2012; Fanti et al. 2013; Curtaz et al. 2014; Zhou et al. 2016a). Rock slope deformation is resulted from the relative sliding or rotation of unstable rock blocks (Crosta et al. 2014; * Jia‑wen Zhou [email protected] 1
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
College of Water Resou
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