An Investigation of a Floor Treatment Plan for In-Pit Dumps with an Underlying Weak Layer

To effectively manage the stability of in-pit dumps with an underlying weak layer, a new plan for treatment staged floor during life mine was proposed in this study. Based on direct shear test results, properties contact surfaces between dumped spoil, and mudstone were determined. Taking Baiyinhua No.1 Open-pit Mine as example, surface spoil determined its cohesion to be 25.78 kPa, internal friction angle 17.58°. The layer 7.50 9.72°. Different rates subsequently based discontinuous structural limit equilibrium theories. dump divided into stages 10-year plan; “safety reserve coefficient” used conditional factor calculate minimum rate. results numerical simulation analysis slope untreated treated inner showed good agreement obtained by method. position shape sliding also found similar, indicating validity established model reliability calculated results. field application economic effect analysis, it that method can minimize rate while maintaining sufficient safety. benefit approximately 1,694,259 dollars at Coal Mine. This is great significance safe efficient production, widely applied.