At 2:00 p.m. on August 6, 2019, the Leidashi landslide was reactivated near Danjing town, Gaoxin east zone, Chengdu, Sichuan province, China. From the data of geological exploration, multi-temporal satellite images, and unmanned aerial vehicle images, it is found that the Leidashi landslide, the slow-tilting thrust-type rock landslide on the impact of rainfall and human engineering activities, is the revival of the 2010 landslide. In this study, the discrete element method software MatDEM was used to simulate the sliding process of the Leidashi landslide in 2019. The results of starting and sliding process and local deformation characteristics of the landslide are obtained. Meanwhile, the displacement field, heat field, and energy change in the sliding process of the landslide are analyzed. Comparing the landslide morphology before and after changing the friction coefficient of the soft layer and slope elevation and adding an "anti-slide pile group" in the process of numerical simulation, it is believed that the deformation and failure of the Leidashi landslide are mainly caused by two factors: artificial excavation and torrential rainfall.
In July 2020, the 11 # tower of the 220kV Mengwen transmission line in Lixian County, Sichuan Province was significantly deformed due to a landslide, which seriously threatened the operation safety of the transmission line. Satellite optical images, satellite InSAR data, UAV images, and ground survey were integrated to investigate and evaluate the landslide. The tower is located at the shoulder of the front edge of an ancient landslide and five small soil landslides with signs of deformation are developed at the front edge of the ancient landslide. The slope presents seasonal deformation characteristics. In May 2020, there was a sudden increase in the deformation rate, and the overall deformation trend increased compared with previous years. It is recommended to monitor the deformation in the rainy season, and carry out the relocation as soon as possible after the rainy season. This case study has proved the effectiveness of spaceborne optical remote sensing technology, spaceborne InSAR, airborne photography technology, and ground survey means in the detailed investigation and risk assessment of tower landslides.
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