Research Article
Strength and Failure Characteristics of Natural and Water-Saturated Coal Specimens under Static and Dynamic Loads
Table 4
Natural and saturated specimen parameters under triaxial static-dynamic compressive tests.
| Specimen number | Saturated status | Diameter/mm | Length/ mm | Density gcm−3 | Confining pressure/ MPa | Axial pressure /MPa | Strain rate /s−1 | Strength/MPa | Failure strain/% | Dry | Wet | Tested | Average | Tested | Average |
| D1 | Natural | 4.97 | 3.04 | 1.42 | / | | 8 | 76 | 54.23 | 66.63 | 1.07 | 0.922 | D2 | Natural | 4.98 | 2.96 | 1.42 | / | | 12 | 59 | 65.07 | | 0.91 | | D3 | Natural | 4.97 | 2.93 | 1.43 | / | 4 MPa | 16 | 59 | 68.27 | | 0.98 | | D4 | Natural | 4.98 | 2.99 | 1.44 | / | | 20 | 60 | 75.39 | | 0.98 | | D5 | Natural | 4.97 | 3.13 | 1.41 | / | | 36 | 63 | 70.16 | | 0.67 | | D6 | 7D water | 4.97 | 3.06 | 1.44 | 1.51 | | 8 | 68 | 63.21 | 74.55 | 1.22 | 1.134 | D7 | 7D water | 4.98 | 3.07 | 1.44 | 1.52 | | 12 | 68 | 70.29 | | 1.17 | | D8 | 7D water | 4.98 | 3.06 | 1.41 | 1.49 | 4 MPa | 16 | 81 | 80.86 | | 1.12 | | D9 | 7D water | 4.98 | 3.07 | 1.40 | 1.48 | | 28 | 70 | 82.71 | | 1.02 | | D10 | 7D water | 4.97 | 3.02 | 1.44 | 1.49 | | 36 | 67 | 75.67 | | 1.14 | |
|
|