Comprehensive monitoring and deformation analysis of extra high slope on the right bank of Hongshiyan Dammed Lake in Ludian Earthquake

Ludian M_s6.5 earthquake induced a super large-scale collapse on the right bank of Hongshiyan, and formed a rare 634 m extra-high collapse slope, which seriously affected the safety of the subsequent weir body treatment project. Based on the disposal of extra high slope, the comprehensive monitoring method and technology based on GNSS, multi-point displacement meter and anchor cable dynamometer are proposed. The field monitoring results show that the surface and deep deformation of the slope is slow and small during the monitoring period, and there is no obvious stress increase in the slope body, and the slope is basically stable-stable. Since there are many cracks in the rock mass and the surface cracks in the back edge of the mountain after the earthquake damage, the on-line monitoring and early warning work should be strengthened. The research results are of great significance for the lower weir body regulation project and the safety of the later weir plug body as a permanent water retaining structure, and provide reference for similar projects.