Abstract
At approximately 2:00 p.m. (Beijing time) on August 6, 2019, the previously controlled Leidashi landslide was reactivated near group 7 of Zhangjiagou village, Jianyang County, Sichuan Province, China. The 2019 Leidashi landslide damaged two main roads and 44 antisliding piles and posed a threat to another main road. This landslide was a reactivation of the 2010 Leidashi landslide and had an accumulation zone of 2.2 × 106 m3. To explore the deformation characteristics and failure mechanism, detailed field investigations, unmanned aerial vehicle photogrammetry, airborne LiDAR surveys, borehole drilling and inclinometer installation were carried out, and the collected data were analyzed. The results show that the 2019 Leidashi landslide could be divided into main slipping zone and activated zone according to movement state, and the main slipping zone could also be divided into main scarp area, main deposit area, climbing area, uplift area, and local landslide area according to the local movement and geomorphic features. The rapidly increasing landslide thrust caused by short-term but continuous heavy rain caused the failure of the antisliding piles and ultimately reactivated the 2010 landslide.
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Acknowledgments
We express our gratitude to Jiangpeng Qian and Tao Liu from the Sichuan Institute of Geological Engineering Investigation Group Co. Ltd. and Yang Liu from the Sichuan Provincial Department of Natural Resources for the borehole and monitoring data and to Chunhua Zhou from the Sichuan Meteorological Bureau for the rainfall data.
Funding
This research was financially supported by the National Key Research and Development Program of China (Grant No. 2018YFC1505402), the Fund for Creative Research Groups of China (Grant No. 41521002), the Fund for Youth Researcher of the Science and Technology Department of Sichuan Province of China (Grant No. 2017JQ0031), and the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project (Grant No. SKLGP2014Z004).
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Li, W., Zhao, B., Xu, Q. et al. Deformation characteristics and failure mechanism of a reactivated landslide in Leidashi, Sichuan, China, on August 6, 2019: an emergency investigation report. Landslides 17, 1405–1413 (2020). https://doi.org/10.1007/s10346-020-01367-w
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DOI: https://doi.org/10.1007/s10346-020-01367-w