Study on Floor Mechanical Failure Characteristics and Stress Evolution in Double Predriven Recovery Rooms

<div>Distribution of DPRR floor heave when the inter-pillar is 20 m. (a) Distribution of floor heave with longwall mining. (b) Maximum value of floor heave with longwall mining.</div>

Mathematical Problems in Engineering

fig16

Figure 16

Figure 16: Study on Floor Mechanical Failure Characteristics and Stress Evolution in Double Predriven Recovery Rooms 