关键词: 露天矿岩质边坡, 无人机, 结构面, DDA, 能量耗散, 多层次全方位

Abstract: The rock mass structural plane affects the stability of rock slope in open-pit mine to a great extent. In order to improve the accuracy of rock slope structural plane information acquisition and energy dissipation in dynamic failure process,a multi-layer and omni-directional photogrammetry method is proposed to obtain surface information of open-pit slope with the advantage of unmanned aerial vehicle (UAV) non-contact photogrammetry. Secondly,viscous damping is applied to the dynamic failure process to achieve energy dissipation,and the results are compared with the test results. Finally,the proposed method was applied to Discontinuous Deformation Analysis (DDA) of a rock slope in an open-pit mine. The study results show that the multilayer and omnidirectional UAV photogrammetry method has a good accuracy in collecting the information of slope structural surface,and the analysis results of discontinuous deformation with 2. 45% ~ 2. 53% viscous damping are basically consistent with the experimental results. The simulation results of the actual failure process of a rock slope in an open-pit mine are good, and the position of the sliding surface obtained by DDA analysis is consistent with the results of in-situ displacement monitoring. The safety factor of sliding surface is 1. 167,which is in the critical state of instability. Therefore,the overlying pre-unstable rock mass should be stripped in advance to solve the problem of landslide hazard from the source. The proposed method can also be applied to the slope body analysis with other structural plane development.

Key words: open-pit rock slope,UAV,structural plane,DDA,dissipation of energy,multi-level and omni-directional