Effect of Dynamic Stress Produced by Rock Blasting on the Optimal Dimensioning of Room and Pillars in Horizontal Layers

Figure 6

Pillar under combined stresses (lithostatic and dynamic stresses). (a) Square section dimensions obtained with the Obert and Duvall equation (1967), as in Section 3.5.4 (2.66 m × 2.66 m). (b) Rectangular section dimensions obtained with the Mark and Chase equation (1997), as in Section 3.5.4 (2.66 m × 2.63 m).

(a)

(b)