Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock

Figure 4

Displacement point monitoring. The measurement lines are marked as Line 1 to Line 22 in order from left to right. Each measurement line has seven measurement points. The measurement points are marked as LB-1, LB-2, LB-3, LB-4, LB-5, LB-6, and LB-7, with B denoting the line number, according to the distance from the stope roof (6.25 cm, 10.4 cm, 14.5 cm, 22.9 cm, 31.2 cm, 43.7 cm, and 56.2 cm, respectively).