露天矿滑坡演化过程的离散元数值研究
Numerical Investigation of the Evolution Process of an Open-Pit Mine Landslide Using Discrete-Element Method
Danqing Song 1 and Han Du 2
1 Assistant Research Fellow, Dept. of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua Univ., Beijing 100084, China.2 Assistant Research Fellow, Dept. of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua Univ., Beijing 100084, China (corresponding author).
Abstract: Because of the complexity of geological conditions and disturbance of external factors, the process of instability of open-pit landslides is very complicated. To illustrate this complex process, taking an open-pit coal mine landslide as an example, an accurate landslide geological section was established via detailed field investigation, remote sensing image interpretation, and field borehole data, in this study. A two-dimensional discrete-element model was established by the Fast CPU Matrix Computing of Discrete-Element Method (MatDEM, Version 1.60). The failure evolution of the landslide was investigated; then, the deformation behavior and dynamic characteristics of the landslide were systematically studied. The analyses of the failure process, velocity, displacement, and heat showed that the evolution of the landslide could be divided into the stages of initial deformation, accelerated deformation, and deceleration and stabilization. During the movement of the landslide, the gravitational potential energy of the landslide gradually converted into kinetic energy, heat, and elastic potential energy. The kinetic energy in the initial stage was small but rapidly increased and occupied the dominant position in the second stage. The kinetic energy gradually decreased and tended to be stable in the third stage. The final geometry and accumulation characteristics of the landslide obtained by numerical simulation were consistent with the corresponding field investigation and remote sensing interpretation. This work can provide a reference for the study of the evolution and prevention of open-pit mine landslides.Keywords: Open-pit mine; Landslide; Failure evolution process; Discrete-element method; MatDEM.
FIGURE 10 DEM model: (a) model box; and (b) DEM model (MatDEM) for the landslide.
FIGURE 11 Failure process of the landslide.
FIGURE 13 Horizontal velocity distribution (unit: m/s) of the landslide.
FIGURE 14 Horizontal velocity waveform of the landslide.
FIGURE 17 Energy (Y-axis) time (X-axis)-history curves of the landslide.
SONG D, DU H，. Numerical Investigation of the Evolution Process of an Open-Pit Mine Landslide Using Discrete-Element Method[J]. International Journal of Geomechanics, International Journal of Geomechanics, 2023, 23(6).DOI: 10.1061/IJGNAI.GMENG-7568.
