State Key Laboratory of Geohazard Prevention and Geoenvironment Protection;
Chengdu University of Technology;
Chengdu 610059;
China;
Guizhou Transportation Planning Survey&Design Academy Co.;
ltd.;
Guiyang 550081;
China;
Guizhou Geological Environment Monitoring Institute;
Guiyang 550001;
China;
High steep slope; Discrete element method; Multilayer coal mining; Mountain mine geological hazard; Subsidence toppling deformation; Mining schemes optimization;