Abstract
The three-dimensional deformation effect of the slope engineering in Antaibao under step-by-step excavation was analyzed and the stability of the slope engineering in the transition from surface to underground mining was evaluated. Formulas for calculating the stress and deformation of the key stratum in the surface–underground combined mining were derived and the mechanical characteristics of the key strata were revealed. The boundary parameters of the open-underground mining were optimized to the different mining sequences. The optimized construction of the cut-and-cover tunnel was analyzed; the antislide piles and the grouting reinforcement process for the backfill material around the shallow tunnel was simulated also. The safety factor and the potential slide face of the tailings dam were calculated by strength reduction method under different conditions. A new method of landslide forecast was put forward and it was verified in the field.
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