|
| Date | Description of coal bump characteristics |
| Horizontal direction | Vertical direction |
|
| 2015-12-22 | The width of roadway is compressed from 6.2 m to 1.8 m | The height of roadway is compressed from 4.1 m to 2.1 m |
| 2017-06-10 | 5 hydraulic props slide 10∼20 cm | Nothing |
| 2017-09-24 | 5 hydraulic props slide 20∼30 cm | Stress increasing by 0.1∼0.3 MPa in 3 boreholes |
| 2017-10-10 | A hydraulic prop slides 20 cm | Stress decreasing by 0.18∼0.28 MPa in 3 boreholes, increasing by 0.39 MPa in one borehole |
| 2017-10-15 | Nothing | Stress decreasing by 0.17 MPa in one borehole, increasing by 0.13∼0.22 MPa in 3 boreholes |
| 2017-10-25 | Nothing | Stress increasing by 0.04∼0.15 MPa in 4 boreholes |
| 2017-11-02 | Nothing | Stress increasing by 0.09∼0.15 MPa in 3 boreholes |
| 2018-02-16 | 2 hydraulic props slide 20 cm | The upright of portal support is damaged under high pressure |
| 2018-03-13 | 14 hydraulic props slide 5∼50 cm | A hydraulic prop sinks 20 cm |
| 2018-04-29 | A hydraulic prop slides 15 cm | Stress increasing by 10.6 MPa in 24 portal supports |
| 2018-06-04 | 17 hydraulic props slide 5∼10 cm | Stress increasing by 0.11∼0.13 MPa in 9 boreholes and 7.9 MPa in 5 portal supports |
| 2019-07-09 | A hydraulic props slide 3 cm | Stress increasing by 1 MPa in one borehole |
| 2019-07-22 | Nothing | Stress increasing by 0.1 MPa in one borehole |
| 2019-7-23∼ | A total of 35 coal bumps, all the behaviors were sound, coal dust dispersion and coal falling on floor |
| 2020-6-17 |
|
