Table 2 Description of overlying strata failure characteristics.
Mining distance (cm) | Distance to fault (cm) | Experimental description | Periodic pressure distance (cm) |
|---|---|---|---|
5 | 90 | Remain unchanged | |
35 | 55 | Slight cracks in roof | |
45 | 45 | Immediate roof collapse | |
55 | 40 | The lst pressure | 55 |
70 | 25 | The 1st periodic pressure | 15 |
80 | 15 | The 2st periodic pressure and primary slip of fault | 10 |
95 | 0 | The 3st periodic pressure and secondary slip of fault | 15 |
115 | -20 | The 4st periodic pressure and severe longitudinal crack | 20 |
125 | -30 | The 5st periodic pressure and slight longitudinal crack | 10 |
145 | -50 | The 6st periodic pressure | 20 |
165 | -70 | The 7st periodic pressure | 20 |
